d and f Block Elements
229 Questions
2022
JEE Mains
MCQ
JEE Main 2022 (Online) 26th July Morning Shift
The dark purple colour of $\mathrm{KMnO}_{4}$ disappears in the titration with oxalic acid in acidic medium. The overall change in the oxidation number of manganese in the reaction is :
A.
5
B.
1
C.
7
D.
2
2022
JEE Mains
MCQ
JEE Main 2022 (Online) 29th June Morning Shift
The electronic configuration of Pt (atomic number 78) is :
A.
[Xe] 4f14 5d9 6s1
B.
[Kr] 4f14 5d10
C.
[Xe] 4f14 5d10
D.
[Xe] 4f14 5d8 6s2
2022
JEE Mains
MCQ
JEE Main 2022 (Online) 28th June Morning Shift
Which one of the lanthanoids given below is the most stable in divalent form?
A.
Ce (Atomic Number 58)
B.
Sm (Atomic number 62)
C.
Eu (Atomic Number 63)
D.
Yb (Atomic Number 70)
2022
JEE Mains
MCQ
JEE Main 2022 (Online) 27th June Evening Shift
The 'f' orbitals are half and completely filled, respectively in lanthanide ions :
[Given : Atomic no. Eu, 63; Sm, 62; Tm, 69; Tb, 65; Yb, 70; Dy, 66]
A.
Eu2+ and Tm2+
B.
Sm2+ and Tm3+
C.
Tb4+ and Yb2+
D.
Dy3+ and Yb3+
2022
JEE Mains
MCQ
JEE Main 2022 (Online) 26th June Evening Shift
The most common oxidation state of Lanthanoid elements is +3. Which of the following is likely to deviate easily from +3 oxidation state?
A.
Ce (At. No. 58)
B.
La (At. No. 57)
C.
Lu (At. No. 71)
D.
Gd (At. No. 64)
2022
JEE Mains
MCQ
JEE Main 2022 (Online) 25th June Evening Shift
The metal ion (in gaseous state) with lowest spin-only magnetic moment value is :
A.
V2+
B.
Ni2+
C.
Cr2+
D.
Fe2+
2022
JEE Mains
MCQ
JEE Main 2022 (Online) 25th June Morning Shift
Cerium (IV) has a noble gas configuration. Which of the following is correct statement about it?
A.
It will not prefer to undergo redox reactions.
B.
It will prefer to gain electron and act as an oxidizing agent.
C.
It will prefer to give away an electron and behave as reducing agent.
D.
It acts as both, oxidizing and reducing agent.
2022
JEE Mains
MCQ
JEE Main 2022 (Online) 25th June Morning Shift
Among the following, which is the strongest oxidizing agent?
A.
Mn3+
B.
Fe3+
C.
Ti3+
D.
Cr3+
2022
JEE Mains
MCQ
JEE Main 2022 (Online) 24th June Evening Shift
Metals generally melt at very high temperature. Amongst the following, the metal with the highest melting point will be :
A.
Hg
B.
Ag
C.
Ga
D.
Cs
2022
JEE Mains
Numerical
JEE Main 2022 (Online) 28th July Morning Shift
The disproportionation of $\mathrm{MnO}_{4}^{2-}$ in acidic medium resulted in the formation of two manganese compounds $\mathrm{A}$ and $\mathrm{B}$. If the oxidation state of $\mathrm{Mn}$ in $\mathrm{B}$ is smaller than that of A, then the spin-only magnetic moment $(\mu)$ value of B in BM is __________. (Nearest integer)
Correct Answer: 4
Explanation:
$3 \overset{+6}{\mathrm{MnO}_{4}^{-2}}+4 \mathrm{H}^{+} \rightarrow \overset{+4}{\mathrm{MnO}_{2}}+\overset{+7}{\mathrm{MnO}_{4}^{-}}$
$\mathrm{Mn} \rightarrow 4 s^{2} 3 d^{5}$
$\mathrm{Mn}^{+4} \rightarrow 3 d^{3}$
$ \mathrm{n}=3 $
$ \begin{aligned} \mu &=\sqrt{n(n+2)} \\\\ &=\sqrt{3(5)} \\\\ &=\sqrt{15} \\\\ &=3.87 \approx 4 \text { B.M. } \end{aligned} $
$\mathrm{Mn} \rightarrow 4 s^{2} 3 d^{5}$
$\mathrm{Mn}^{+4} \rightarrow 3 d^{3}$
$ \mathrm{n}=3 $
$ \begin{aligned} \mu &=\sqrt{n(n+2)} \\\\ &=\sqrt{3(5)} \\\\ &=\sqrt{15} \\\\ &=3.87 \approx 4 \text { B.M. } \end{aligned} $
2022
JEE Mains
Numerical
JEE Main 2022 (Online) 26th July Evening Shift
The spin-only magnetic moment value of the compound with strongest oxidizing ability among $\mathrm{MnF}_{4}, \mathrm{MnF}_{3}$ and $\mathrm{MnF}_{2}$ is ____________ B.M. [nearest integer]
Correct Answer: 5
Explanation:
$\mathrm{MnF}_{3}$ has the strongest oxidizing ability
$ \left[\begin{array}{l} \mathrm{E}_{\mathrm{Mn}^{+3} / \mathrm{Mn}^{+2}}^{\circ} \simeq 1.57 \mathrm{~V} \\ \& \,\,\mathrm{E}_{\mathrm{Mn}^{+4} / \mathrm{Mn}^{+2}}^{\circ} \simeq 1.2 \mathrm{~V} \end{array}\right] $
So, spin only magnetic moment
$ =\sqrt{4(4+2)}=\sqrt{24} \text { B.M. } $
$\simeq 5$
$ \left[\begin{array}{l} \mathrm{E}_{\mathrm{Mn}^{+3} / \mathrm{Mn}^{+2}}^{\circ} \simeq 1.57 \mathrm{~V} \\ \& \,\,\mathrm{E}_{\mathrm{Mn}^{+4} / \mathrm{Mn}^{+2}}^{\circ} \simeq 1.2 \mathrm{~V} \end{array}\right] $
So, spin only magnetic moment
$ =\sqrt{4(4+2)}=\sqrt{24} \text { B.M. } $
$\simeq 5$
2022
JEE Mains
Numerical
JEE Main 2022 (Online) 25th July Morning Shift
Among Co3+, Ti2+, V2+ and Cr2+ ions, one if used as a reagent cannot liberate H2 from dilute mineral acid solution, its spin-only magnetic moment in gaseous state is ___________ B.M. (Nearest integer)
Correct Answer: 5
Explanation:
$\mathrm{Co}^{3+}$ will not liberate $\mathrm{H}_{2}$ gas an reaction with dilute acid
$\mathrm{E}_{\mathrm{Co}^{3+}/\mathrm{Co}^{2+}}^{\mathrm{O}}=+1.97$
And $\mathrm{Co}^{3+}$ has electronic configuration $=[\operatorname{Ar}] 3 d^{6}$
$\therefore 4$ unpaired $\mathrm{e}^{-}$ are present in it
$\therefore$ Spin-only magnetic moment $=\sqrt{4(4+2)} =4.92 \approx 5$
$\mathrm{E}_{\mathrm{Co}^{3+}/\mathrm{Co}^{2+}}^{\mathrm{O}}=+1.97$
And $\mathrm{Co}^{3+}$ has electronic configuration $=[\operatorname{Ar}] 3 d^{6}$
$\therefore 4$ unpaired $\mathrm{e}^{-}$ are present in it
$\therefore$ Spin-only magnetic moment $=\sqrt{4(4+2)} =4.92 \approx 5$
2022
JEE Mains
Numerical
JEE Main 2022 (Online) 29th June Evening Shift
Spin only magnetic moment of [MnBr6]4$-$ is _________ B.M. (round off to the closest integer)
Correct Answer: 6
Explanation:
$\begin{aligned} & {\left[\mathrm{MnBr}_6\right]^{4-}} \\\\ & x-6=-4\end{aligned}$
$ \begin{aligned} x & =+2 \\\\ \mathrm{Mn} & =[\mathrm{Ar}] 3 d^5 4 s^2 \\\\ \mathrm{Mn}^{2+} & =[\mathrm{Ar}] 3 d^5 4 s^0 \end{aligned} $
So, number of unpaired electrons $(n)=5$
$ \begin{aligned} \mu & =\sqrt{n(n+2)} \\\\ \mu & =\sqrt{5(5+2)} \\\\ & =\sqrt{35} \\\\ & =5.91 \text { B.M. } \\\\ & \approx 6 \text { B.M. } \end{aligned} $
$ \begin{aligned} x & =+2 \\\\ \mathrm{Mn} & =[\mathrm{Ar}] 3 d^5 4 s^2 \\\\ \mathrm{Mn}^{2+} & =[\mathrm{Ar}] 3 d^5 4 s^0 \end{aligned} $
So, number of unpaired electrons $(n)=5$
$ \begin{aligned} \mu & =\sqrt{n(n+2)} \\\\ \mu & =\sqrt{5(5+2)} \\\\ & =\sqrt{35} \\\\ & =5.91 \text { B.M. } \\\\ & \approx 6 \text { B.M. } \end{aligned} $
2022
JEE Mains
Numerical
JEE Main 2022 (Online) 29th June Evening Shift
For the reaction given below :
CoCl3 . xNH3 + AgNO3 (aq) $\to$
If two equivalents of AgCl precipitate out, then the value of x will be _____________.
Correct Answer: 5
Explanation:
$
\begin{aligned}
&\mathrm{CoCl}_3 \cdot \mathrm{xNH}_3+\mathrm{AgNO}_3 \rightarrow \underset{\text{2 mol}}{\mathrm{AgCl} \downarrow}\\\\
&\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}\right] \mathrm{Cl}_2+\mathrm{AgNO}_3 \rightarrow \underset{\text{2 mol}}{\mathrm{AgCl}} \downarrow\\\\
&x=5
\end{aligned}
$
2022
JEE Mains
Numerical
JEE Main 2022 (Online) 29th June Morning Shift
The number of terminal oxygen atoms present in the product B obtained from the following reaction is _____________.
FeCr2O4 + Na2CO3 + O2 $\to$ A + Fe2O3 + CO2
A + H+ $\to$ B + H2O + Na+
Correct Answer: 6
Explanation:
$\mathrm{FeCr}_{2} \mathrm{O}_{4}+\mathrm{Na}_{2} \mathrm{CO}_{3}+\mathrm{O}_{2} \longrightarrow \mathrm{Fe}_{2} \mathrm{O}_{3}+\mathrm{CO}_{2}$ $+\mathrm{Na}_{2} \mathrm{CrO}_{4}$
(A)
$ \mathrm{Na}_{2} \mathrm{CrO}_{4}+\mathrm{H}^{+} \longrightarrow \mathrm{Cr}_{2} \mathrm{O}_{7}^{-2}+\mathrm{H}_{2} \mathrm{O}+\overset{+}{\mathrm{Na}} $
$ \mathrm{Na}_{2} \mathrm{CrO}_{4}+\mathrm{H}^{+} \longrightarrow \mathrm{Cr}_{2} \mathrm{O}_{7}^{-2}+\mathrm{H}_{2} \mathrm{O}+\overset{+}{\mathrm{Na}} $
2022
JEE Mains
Numerical
JEE Main 2022 (Online) 29th June Morning Shift
An acidified manganate solution undergoes disproportionation reaction. The spin-only magnetic moment value of the product having manganese in higher oxidation state is _____________ B.M. (Nearest integer)
Correct Answer: 0
Explanation:
$
\begin{aligned}
& 3 \mathrm{MnO}_4^{2-}+4 \mathrm{H}^{+} \longrightarrow 2 \overset{+7}{\mathrm{MnO}_4^{-}}+\overset{+4}{\mathrm{MnO}_2}+2 \mathrm{H}_2 \mathrm{O} \\\\
& \overset{+7}{\mathrm{Mn}}=\text { no. of unpaired electrons is '0' } \\\\
& \mu=0 \text { B.M. }
\end{aligned}
$
2022
JEE Mains
Numerical
JEE Main 2022 (Online) 27th June Morning Shift
The number of statements correct from the following for Copper (at. no. 29) is/are ____________.
(A) Cu(II) complexes are always paramagnetic.
(B) Cu(I) complexes are generally colourless
(C) Cu(I) is easily oxidized
(D) In Fehling solution, the active reagent has Cu(I)
Correct Answer: 3
Explanation:
(A) $\mathrm{Cu}$ (II) complexes are always paramagnetic as they have one unpaired electron due to $d^{9}$ configuration of $\mathrm{Cu}(\mathrm{II})$
(B) $\mathrm{Cu}(\mathrm{I})$ complexes are generally colourless due to $d^{10}$ configuration.
(C) $\mathrm{Cu}(\mathrm{I})$ is easily oxidised to $\mathrm{Cu}^{+2}$ in aqueous solution
$2 \mathrm{Cu}^{+} \rightarrow \mathrm{Cu}^{+2}+\mathrm{Cu}$
$\mathrm{Cu}^{+1}$ disproportionates to $\mathrm{Cu}^{+2}$ and $\mathrm{Cu}$
$\left(E_{\text {cell }}^{\circ}>0\right.$ for this cell reaction in aqueous solution)
In Fehling's solution, active reagent has $\mathrm{Cu}(\mathrm{II})$ which is reduced to $\mathrm{Cu}(\mathrm{I})$ on reaction with aldehydes.
Hence (D) statement is incorrect
(B) $\mathrm{Cu}(\mathrm{I})$ complexes are generally colourless due to $d^{10}$ configuration.
(C) $\mathrm{Cu}(\mathrm{I})$ is easily oxidised to $\mathrm{Cu}^{+2}$ in aqueous solution
$2 \mathrm{Cu}^{+} \rightarrow \mathrm{Cu}^{+2}+\mathrm{Cu}$
$\mathrm{Cu}^{+1}$ disproportionates to $\mathrm{Cu}^{+2}$ and $\mathrm{Cu}$
$\left(E_{\text {cell }}^{\circ}>0\right.$ for this cell reaction in aqueous solution)
In Fehling's solution, active reagent has $\mathrm{Cu}(\mathrm{II})$ which is reduced to $\mathrm{Cu}(\mathrm{I})$ on reaction with aldehydes.
Hence (D) statement is incorrect
2022
JEE Mains
Numerical
JEE Main 2022 (Online) 26th June Morning Shift
The spin-only magnetic moment value of the most basic oxide of vanadium among V2O3, V2O4 and V2O5 is _____________ B.M. (Nearest integer)
Correct Answer: 3
Explanation:
The most basic oxide among $\mathrm{V}_{2} \mathrm{O}_{3}, \mathrm{~V}_{2} \mathrm{O}_{4}$ and $\mathrm{V}_{2} \mathrm{O}_{5}$ is $\mathrm{V}_{2} \mathrm{O}_{3}$
$ \mathrm{V}_{2} \mathrm{O}_{3}=\mathrm{V}^{+3}\left(\mathrm{~d}^{2}\right) $
Magnetic moment $=\sqrt{2(2+2)}=\sqrt{8}$
$ =2.83 \approx 3 $
$ \mathrm{V}_{2} \mathrm{O}_{3}=\mathrm{V}^{+3}\left(\mathrm{~d}^{2}\right) $
Magnetic moment $=\sqrt{2(2+2)}=\sqrt{8}$
$ =2.83 \approx 3 $
2022
JEE Mains
Numerical
JEE Main 2022 (Online) 24th June Evening Shift
Manganese (VI) has ability to disproportionate in acidic solution. The difference in oxidation states of two ions it forms in acidic solution is ____________.
Correct Answer: 3
Explanation:
Manganese $(\mathrm{VI})$ disproportionates in acidic medium as
$3 \mathrm{MnO}_{4}^{2-}+4 \mathrm{H}^{+} \longrightarrow 2 \mathrm{MnO}_{4}^{-}+\mathrm{MnO}_{2}+2 \mathrm{H}_{2} \mathrm{O}$
The difference in oxidation states of $\mathrm{Mn}$ in the products formed $=7-4=3$
$3 \mathrm{MnO}_{4}^{2-}+4 \mathrm{H}^{+} \longrightarrow 2 \mathrm{MnO}_{4}^{-}+\mathrm{MnO}_{2}+2 \mathrm{H}_{2} \mathrm{O}$
The difference in oxidation states of $\mathrm{Mn}$ in the products formed $=7-4=3$
2022
JEE Mains
Numerical
JEE Main 2022 (Online) 24th June Morning Shift
The difference in oxidation state of chromium in chromate and dichromate salts is ___________.
Correct Answer: 0
Explanation:
Chromate ion $\rightarrow \mathrm{CrO}_{4}^{2-}$, oxidation state of $\mathrm{Cr}=+6$
Dichromate ion $\rightarrow \mathrm{Cr_2O}_{7}^{2-}$, oxidation state of $\mathrm{Cr}=+6$
$\therefore $ Difference in oxidation state $=$ zero
Dichromate ion $\rightarrow \mathrm{Cr_2O}_{7}^{2-}$, oxidation state of $\mathrm{Cr}=+6$
$\therefore $ Difference in oxidation state $=$ zero
2022
JEE Mains
MSQ
JEE Main 2022 (Online) 28th July Evening Shift
Which of the following pair is not isoelectronic species?
(At. no. Sm, 62; Er, 68; Yb, 70; Lu, 71; Eu, 63; Tb, 65; Tm, 69)
A.
$\mathrm{Sm}^{2+}$ and $\mathrm{Er}^{3+}$
B.
$\mathrm{Yb}^{2+}$ and $\mathrm{Lu}^{3+}$
C.
$\mathrm{Eu}^{2+}$ and $\mathrm{Tb}^{4+}$
D.
$\mathrm{Tb}^{2+}$ and $\mathrm{Tm}^{4+}$
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 1st September Evening Shift
In the given chemical reaction, colors of the Fe2+ and Fe3+ ions, are respectively :
5Fe2+ + MnO$_4^ - $ + 8H+ $\to$ Mn2+ + 4H2O + 5Fe3+
5Fe2+ + MnO$_4^ - $ + 8H+ $\to$ Mn2+ + 4H2O + 5Fe3+
A.
Yellow, Orange
B.
Yellow, Green
C.
Green, Orange
D.
Green, Yellow
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 1st September Evening Shift
Identify the element for which electronic configuration in +3 oxidation state is [Ar]3d5 :
A.
Ru
B.
Mn
C.
Co
D.
Fe
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 31st August Evening Shift
The Eu2+ ion is a strong reducing agent in spite of its ground state electronic configuration (outermost) : [Atomic number of Eu = 63]
A.
4f76s2
B.
4f6
C.
4f7
D.
4f66s2
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 31st August Evening Shift
In which one of the following sets all species show disproportionation reaction?
A.
ClO$_2^ - $, F2, MnO$_4^ - $ and Cr2O$_7^{2 - }$
B.
Cr2O$_7^{2 - }$, MnO$_4^{ - }$, ClO$_2^{- }$ and Cl2
C.
MnO$_4^{ - }$, ClO$_2^{- }$, Cl2 and Mn3+
D.
ClO$_4^{ - }$, MnO$_4^{ - }$, ClO$_2^{ - }$ and F2
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 31st August Morning Shift
In the structure of the dichromate ion, there is a :
A.
linear symmetrical Cr-O-Cr bond.
B.
non-linear symmetrical Cr-O-Cr bond.
C.
linear unsymmetrical Cr-O-Cr bond.
D.
non-linear unsymmetrical Cr-O-Cr bond.
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 31st August Morning Shift
Which one of the following lanthanides exhibits +2 oxidation state with diamagnetic nature? (Given Z for Nd = 60, Yb = 70, La = 57, Ce = 58)
A.
Nd
B.
Yb
C.
La
D.
Ce
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 27th August Evening Shift
The addition of dilute NaOH to Cr3+ salt solution will give :
A.
a solution of [Cr(OH)4]$-$
B.
precipitate of Cr2O3(H2O)n
C.
precipitate of [Cr(OH)6]3$-$
D.
precipitate of Cr(OH)3
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 27th August Evening Shift
Potassium permanganate on heating at 513 K gives a product which is :
A.
paramagnetic and colourless
B.
diamagnetic and green
C.
diamagnetic and colourless
D.
paramagnetic and green
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 27th August Morning Shift
The nature of oxides V2O3 and CrO is indexed as 'X' and 'Y' type respectively. The correct set of X and Y is :
A.
| X = basic | Y = amphoteric |
B.
| X = amphoteric | Y = basic |
C.
| X = acidic | Y = acidic |
D.
| X = basic | Y = basic |
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 26th August Morning Shift
Which one of the following when dissolved in water gives coloured solution in nitrogen atmosphere?
A.
CuCl2
B.
AgCl
C.
ZnCl2
D.
Cu2Cl2
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 25th July Evening Shift
The spin only magnetic moments (in BM) for free Ti3+, V2+ and Sc3+ ions respectively are :
(At.No. Sc : 21, Ti : 22, V : 23)
(At.No. Sc : 21, Ti : 22, V : 23)
A.
3.87, 1.73, 0
B.
1.73, 3.87, 0
C.
1.73, 0, 3.87
D.
0, 3.87, 1.73
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 25th July Evening Shift
Which one of the following metals forms interstitial hydride easily?
A.
Cr
B.
Fe
C.
Mn
D.
Co
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 25th July Morning Shift
The correct order of following 3d metal oxides, according to their oxidation numbers is :
(a) CrO3, (b) Fe2O3, (c) MnO2, (d) V2O5, (e) Cu2O
(a) CrO3, (b) Fe2O3, (c) MnO2, (d) V2O5, (e) Cu2O
A.
(d) > (a) > (b) > (c) > (e)
B.
(a) > (c) > (d) > (b) > (e)
C.
(a) > (d) > (c) > (b) > (e)
D.
(c) > (a) > (d) > (e) > (b)
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 22th July Evening Shift
The set having ions which are coloured and paramagnetic both is :
A.
Cu2+, Cr3+, Sc+
B.
Cu2+, Zn2+, Mn4+
C.
Sc3+, V5+, Ti4+
D.
Ni2+, Mn7+, Hg2+
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 18th March Evening Shift
The oxide that shows magnetic property is :
A.
MgO
B.
SiO2
C.
Mn3O4
D.
Na2O
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 18th March Morning Shift
Match List - I with List - II
Choose the most appropriate answer from the options given below :
| List - I |
List - II |
||
|---|---|---|---|
| (a) | Chlorophyll | (i) | Ruthenium |
| (b) | Vitamin-${B_{12}}$ | (ii) | Platinum |
| (c) | Anticancer drug | (iii) | Cobalt |
| (d) | Grubbs catalyst | (iv) | Magnesium |
Choose the most appropriate answer from the options given below :
A.
(a) - (iii), (b) - (ii), (c) - (iv), (d) - (i)
B.
(a) - (iv), (b) - (iii), (c) - (ii), (d) - (i)
C.
(a) - (iv), (b) - (iii), (c) - (i), (d) - (ii)
D.
(a) - (iv), (b) - (ii), (c) - (iii), (d) - (i)
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 17th March Evening Shift
The common positive oxidation states for an element with atomic number 24, are :
A.
+1 and +3
B.
+2 to +6
C.
+1 to +6
D.
+1 and +3 to +6
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 17th March Morning Shift
What is the spin-only magnetic moment value (BM) of a divalent metal ion with atomic number 25, in it's aqueous solution?
A.
zero
B.
5.26
C.
5.0
D.
5.92
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 17th March Morning Shift
Given below are two statements :
Statement I : Potassium permanganate on heating at 573K forms potassium manganate.
Statement II : Both potassium permanganate and potassium manganate are tetrahedral and paramagnetic in nature.
In the light of the above statements, choose the most appropriate answer from the options given below :
Statement I : Potassium permanganate on heating at 573K forms potassium manganate.
Statement II : Both potassium permanganate and potassium manganate are tetrahedral and paramagnetic in nature.
In the light of the above statements, choose the most appropriate answer from the options given below :
A.
Statement I is true but statement II is false
B.
Statement I is false but statement II is true
C.
Both statement I and statement II are false
D.
Both statement I and statement II are true
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 16th March Evening Shift
Fex2 and Fey3 are known when x and y are :
A.
x = F, Cl, Br, I and y = F, Cl, Br, I
B.
x = F, Cl, Br and y = F, Cl, Br, I
C.
x = F, Cl, Br, I and y = F, Cl, Br
D.
x = Cl, Br, I and y = F, Cl, Br, I
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 16th March Evening Shift
Arrange the following metal complex/compounds in the increasing order of spin only magnetic moment. Presume all the three, high spin system.
(Atomic numbers Ce = 58, Gd = 64 and Eu = 63)
(a) (NH4)2[Ce(NO3)6]
(b) Gd(NO3)3 and
(c) Eu(NO3)3
(Atomic numbers Ce = 58, Gd = 64 and Eu = 63)
(a) (NH4)2[Ce(NO3)6]
(b) Gd(NO3)3 and
(c) Eu(NO3)3
A.
(a) < (b) < (c)
B.
(b) < (a) < (c)
C.
(a) < (c) < (b)
D.
(c) < (a) < (b)
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 16th March Morning Shift
Given below are two statements :
Statement I : The Eo value for Ce4+ / Ce3+ is + 1.74 V.
Statement II : Ce is more stable in Ce4+ state than Ce3+ state.
In the light of the above statements, choose the most appropriate answer from the options given below :
Statement I : The Eo value for Ce4+ / Ce3+ is + 1.74 V.
Statement II : Ce is more stable in Ce4+ state than Ce3+ state.
In the light of the above statements, choose the most appropriate answer from the options given below :
A.
Statement I is incorrect but statement II is correct
B.
Both statement I and statement II are correct
C.
Both statement I and statement II are incorrect
D.
Statement I is correct but statement II is incorrect
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 16th March Morning Shift
Given below are two statement : one is labelled as Assertion A and the other is labelled as Reason R :
Assertion A : Size of Bk3+ ion is less than Np3+ ion.
Reason R : The above is a consequence of the lanthanoid contraction.
In the light of the above statements, choose the correct answer from the options given below :
Assertion A : Size of Bk3+ ion is less than Np3+ ion.
Reason R : The above is a consequence of the lanthanoid contraction.
In the light of the above statements, choose the correct answer from the options given below :
A.
Both A and B are true and R is the correct explanation of A
B.
A is false but R is true
C.
A is true but R is false
D.
Both A and B are true but R is not the correct explanation of A
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 26th February Morning Shift
Which one of the following lanthanoids does not form MO2? [M is lanthanoid metal]
A.
Nd
B.
Dy
C.
Yb
D.
Pr
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 25th February Morning Shift
Given below are two statements :
Statement I : CeO2 can be used for oxidation of aldehydes and ketones.
Statement II : Aqueous solution of EuSO4 is a strong reducing agent.
In the light of the above statements, choose the correct answer from the options given below :
Statement I : CeO2 can be used for oxidation of aldehydes and ketones.
Statement II : Aqueous solution of EuSO4 is a strong reducing agent.
In the light of the above statements, choose the correct answer from the options given below :
A.
Statement I is true but Statement II is false.
B.
Statement I is false but Statement II is true
C.
Both Statement I and Statement II are false
D.
Both Statement I and Statement II are true
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 25th February Morning Shift
In which of the following pairs, the outer most electronic configuration will be the same?
A.
Cr+ and Mn2+
B.
Ni2+ and Cu+
C.
V2+ and Cr+
D.
Fe2+ and Co+
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 24th February Evening Shift
The incorrect statement among the following is :
A.
RuO4 is an oxidizing agent
B.
Cr2O3 is an amphoteric oxide.
C.
VOSO4 is a reducing agent
D.
Red colour of ruby is due to the presence of Co3+
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 24th February Evening Shift
What is the correct order of the following elements with respect to their density?
A.
Cr < Zn < Co < Cu < Fe
B.
Cr < Fe < Co < Cu < Zn
C.
Zn < Cr < Fe < Co < Cu
D.
Zn < Cu < Co < Fe < Cr
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 24th February Morning Shift
Given below are two statements :
Statement I : Colourless cupric metaborate is reduced to cuprous metaborate in a luminous flame.
Statement II : Cuprous metaborate is obtained by heating boric anhydride and copper sulphate in a non-luminous flame.
In the light of the above statements, choose the most appropriate answer from the options given below.
Statement I : Colourless cupric metaborate is reduced to cuprous metaborate in a luminous flame.
Statement II : Cuprous metaborate is obtained by heating boric anhydride and copper sulphate in a non-luminous flame.
In the light of the above statements, choose the most appropriate answer from the options given below.
A.
Statement I is true but Statement II is false
B.
Statement I is false but Statement II is true
C.
Both Statement I and Statement II are false
D.
Both Statement I and Statement II are true
