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d and f Block Elements

82 Questions Start NEET Test
All Exams NEET AIIMS
2012 Q51 NEET MCQ
10 Mar 2026
Which of the statements is not true?
A.
On passing H2S through acidified K2Cr2O7 solution, a milky colour is observed.
B.
Na2Cr2O7 is preferred over K2Cr2O7 in volumetric analysis.
C.
K2Cr2O7 solution in acidic medium is orange.
D.
K2Cr2O7 solution becomes yellow increasing the pH beyond 7.
2011 Q52 NEET MCQ
10 Mar 2026
Acidified K2Cr2O7 solution turns green when Na2SO3 is added to it. This is due to the formation of
A.
Cr2(SO4)3
B.
CrO$_4^{2 - }$
C.
Cr2(SO3)3
D.
CrSO4
2011 Q53 NEET MCQ
10 Mar 2026
For the four successive transition elements (Cr, Mn, Fe and Co), the stability of + 2 oxidation state will be there in which of the following order?
(At. nos. Cr = 24, Mn = 25, Fe = 26, Co = 27)
A.
Mn > Fe > Cr > Co
B.
Fe > Mn > Co > Cr
C.
Co > Mn > Fe > Cr
D.
Cr > Mn > Co > Fe
2010 Q54 NEET MCQ
10 Mar 2026
Match List I (substances) with List II (processes) employed in the manufacture of the substances and select the correct option.
Column ${\rm I}$
(Substances)		 Column ${\rm I}$${\rm I}$
(Processes)
(A) Sulphuric acid (i) Haber's process
(B) Steel (ii) Bessemer's process
(C) Sodium hydroxide (iii) Leblanc process
(D) Ammonia (iv) Contact process
A.
(A) $ \to $ (i);  (B) $ \to $ (iv);  (C) $ \to $ (ii);  (D) $ \to $ (iii)
B.
(A) $ \to $ (i);  (B) $ \to $ (ii);  (C) $ \to $ (iii);  (D) $ \to $ (iv)
C.
(A) $ \to $ (iv);  (B) $ \to $ (iii);  (C) $ \to $ (ii);  (D) $ \to $ (i)
D.
(A) $ \to $ (iv);  (B) $ \to $ (ii);  (C) $ \to $ (iii);  (D) $ \to $ (i)
2010 Q55 NEET MCQ
10 Mar 2026
Which of the following oxidation states is the most common among the lanthanoids?
A.
4
B.
2
C.
5
D.
3
2010 Q56 NEET MCQ
10 Mar 2026
Which of the following ions has electronic configuration [Ar]3d6?
(At. nos. Mn = 25, Fe = 26, Co = 27, Ni = 28)
A.
Ni3+
B.
Mn3+
C.
Fe3+
D.
Co3+
2010 Q57 NEET MCQ
10 Mar 2026
Which of the following ions will exhibit colour in aqueous solutions?
A.
La3+ (Z = 57)
B.
Ti3+ (Z = 22)
C.
Lu3+ (Z = 71)
D.
Se3+ (Z = 21)
2010 Q58 NEET MCQ
10 Mar 2026
Which of the following pairs has the same size?
A.
Fe2+, Ni2+
B.
Zr4+, Ti4+
C.
Zr4+, Hf4+
D.
Zn2+, Hf4+
2009 Q59 NEET MCQ
10 Mar 2026
Which one of the elements with the following outer orbital configurations may exhibit the largest number of oxidation states?
A.
3d54s1
B.
3d54s2
C.
3d24s2
D.
3d34s2
2008 Q60 NEET MCQ
10 Mar 2026
The correct order of decreasing second ionisation enthalpy of Ti(22), V(23), Cr(24) and Mn(25) is
A.
Mn > Cr > Ti > V
B.
Ti > V > Cr > Mn
C.
Cr > Mn > V > Ti
D.
V > Mn > Cr > Ti
2007 Q61 NEET MCQ
10 Mar 2026
Identify the incorrect statement among the following:
A.
Lanthanoid contraction is the accumulation of successive shrinkages.
B.
As a result of lanthanoid contraction, the properties of 4d series of the transition elements have no similarities with the 5d series of elements.
C.
Shielding power of 4$f$ electrons is quite weak.
D.
There is a decrease in the radii of the atoms or ions as one proceeds from La to Lu.
2007 Q62 NEET MCQ
10 Mar 2026
Which one of the following ions is the most stable in aqueous solution?
(At. No. Ti = 22, V = 23, Cr = 24, Mn = 25)
A.
V3+
B.
Ti3+
C.
Mn3+
D.
Cr3+
2006 Q63 NEET MCQ
10 Mar 2026
Copper sulphate dissolves in excess of KCN to give
A.
Cu(CN)2
B.
CuCN
C.
[Cu(CN)4]3$-$
D.
[Cu(CN)4]2$-$
2006 Q64 NEET MCQ
10 Mar 2026
In which of the following pairs are both the ions coloured in aqueous solution?
(At. no. : Sc = 21, Ti = 22, Ni = 28, Cu = 29, Co = 27)
A.
Ni2+, Cu+
B.
Ni2+, Ti3+
C.
Sc3+, Ti3+
D.
Sc3+, Co2+.
2006 Q65 NEET MCQ
10 Mar 2026
More number of oxidation states are exhibited by the actinoids than by the lanthanoids. The main reason for this is
A.
more active nature of the actinoids
B.
more energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals
C.
lesser energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals
D.
greater metallic character of the lanthanoids than that of the corresponding actinoids.
2005 Q66 NEET MCQ
10 Mar 2026
The number of moles of KMnO4 reduced by one mole of KI in alkaline medium is
A.
one
B.
two
C.
five
D.
one fifth
2005 Q67 NEET MCQ
10 Mar 2026
More number of oxidation states are exhibited by the actinoids than by the lanthanoids. The main reason for this is
A.
more active nature of the actinoids
B.
more energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals
C.
lesser energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals
D.
greater metallic character of the lanthanoids than that of the corresponding actinoids.
2005 Q68 NEET MCQ
10 Mar 2026
Four successive members of the first row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionisation enthalpy?
A.
Vanadium (Z = 23)
B.
Chromium (Z = 24)
C.
Manganese (Z = 25)
D.
Iron (Z = 26)
2005 Q69 NEET MCQ
10 Mar 2026
The aqueous solution containing which one of the following ions will be colourless?
(Atomic number : Sc = 21, Fe = 26, Ti = 22, Mn = 25)
A.
Sc3+
B.
Fe2+
C.
Ti3+
D.
Mn2+
2004 Q70 NEET MCQ
10 Mar 2026
lanthanoids are
A.
14 elements in the sixth period (atomic no. 90 to 103) that are filling 4f sublevel
B.
14 elements in the seventh period (atomic number = 90 to 103) that are filling 5f sublevel
C.
14 elements in the sixth period (atomic number = 58 to 71) that are filling the 4f sublevel
D.
14 elements in the seventh period (atomic number = 50 to 71) that are filling 4f sublevel.
2004 Q71 NEET MCQ
10 Mar 2026
Among the following series of transition metal ions, the one where all metal ions have 3d2 electronic configuration is
[At. Nos. Ti = 22, V = 23, Cr = 24, Mn = 25]
A.
Ti3+, V2+, Cr3+, Mn4+
B.
Ti+, V4+, Cr6+, Mn7+
C.
Ti4+, V3+, Cr2+, Mn3+
D.
Ti2+, V3+, Cr4+, Mn5+
2003 Q72 NEET MCQ
10 Mar 2026
Which one of the following characteristics of the transition metals is associated with their catalytic activity?
A.
High enthalpy of atomization
B.
Paramagnetic behaviour
C.
Colour of hydrated ions
D.
Variable oxidation states
2003 Q73 NEET MCQ
10 Mar 2026
The correct order of ionic radii of Y3+, La3+, Eu3+ and Lu3+ is
(Atomic nos. Y = 39, La = 57, Eu = 63, Lu = 71)
A.
Y3+ < La3+ < Eu3+ < Lu3+
B.
Y3+ < Lu3+ < Eu3+ < La3+
C.
Lu3+ < Eu3+ < La3+ < Y3+
D.
La3+ < Eu3+ < Lu3+ < Y3+
2003 Q74 NEET MCQ
10 Mar 2026
The basic character of the transition metal monoxides follows the order
(Atomic no's. Ti = 22, V = 23, Cr = 24, Fe = 26)
A.
VO > CrO > TiO > FeO
B.
CrO > VO > FeO > TiO
C.
TiO > FeO > VO > CrO
D.
TiO > VO > CrO > FeO
2002 Q75 NEET MCQ
10 Mar 2026
An atom has electronic configuration 1s2 2s2 2p6 3s2 3p6 3d3 4s2, you will place it in
A.
fifth
B.
fifteenth
C.
second
D.
third.
2002 Q76 NEET MCQ
10 Mar 2026
Zn gives H2 gas with H2SO4 and HCl but not with HNO3 because
A.
Zn act as oxidising agent when react with HNO3
B.
HNO3 is weaker acid than H2SO4 and HCl
C.
In electrochemical series Zn is above hydrogen
D.
NO$_3^ - $ is reduced in preference to hydronium ion.
2002 Q77 NEET MCQ
10 Mar 2026
General electronic configuration of lanthanides is
A.
$\left( {n - 2} \right){f^{1 - 14}}\,\left( {n - 1} \right){s^2}{p^6}{d^{0 - 1}}\,n{s^2}$
B.
$\left( {n - 2} \right){f^{0 - 14}}\,\left( {n - 1} \right){d^{0 - 1}}\,n{s^2}$
C.
$\left( {n - 2} \right){f^{0 - 14}}\,\left( {n - 1} \right){d^{10}}\,n{s^2}$
D.
$\left( {n - 2} \right){d^{0 - 1}}\left( {n - 1} \right)\,{f^{1 - 14}}\,n{s^2}$
2002 Q78 NEET MCQ
10 Mar 2026
Which of the following shows maximum number of oxidation states?
A.
Cr
B.
Fe
C.
Mn
D.
V
2001 Q79 NEET MCQ
10 Mar 2026
Which of the following statement is not correct?
A.
La(OH)3 is less basic than Lu(OH)3.
B.
In lanthanide series ionic radius of Lu+3 ion decreases.
C.
La is actually an element of transition series rather lanthanides.
D.
Atomic radius of Zn and Hf are same because of lanthanide contraction.
2001 Q80 NEET MCQ
10 Mar 2026
The most convenient method to protect the botton of ship made of iron is
A.
coating it with red lead oxide
B.
white tin plating
C.
connecting it with Mg block
D.
connecting it with Pb block.
2000 Q81 NEET MCQ
10 Mar 2026
Which of the following shows maximum number of oxidation states?
A.
Cr
B.
Fe
C.
Mn
D.
V
2000 Q82 NEET MCQ
10 Mar 2026
Which ion is colourless?
A.
Cr4+
B.
Se3+
C.
Ti3+
D.
V3+