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d and f Block Elements

229 Questions
All Exams JEE Mains JEE Advanced TS-EAMCET AP-EAPCET
2009 JEE Mains MCQ
AIEEE 2009
In context with the transition elements, which of the following statements is incorrect ?
A.
In addition to the normal oxidation states, the zero oxidation state is also shown by these elements in complexes.
B.
In the highest oxidation states, the transition metal show basic character and form cationic complexes.
C.
In the highest oxidation states of the first five transition elements (Sc to Mn), all the 4s and 3d electrons are used for bonding
D.
Once the d5 configuration is exceeded, the tendency to involve all the 3d electrons in bonding decreases.
2009 JEE Mains MCQ
AIEEE 2009
Knowing that the Chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of the following statements is incorrect?
A.
Because of the large size of the Ln (III) ions the bonding in its compounds is predominantly ionic in character.
B.
The ionic sizes of Ln (III) decrease in general with increasing atomic number.
C.
Ln (III) compounds are generally colourless
D.
Ln (III) hydroxides are mainly basic in character.
2008 JEE Mains MCQ
AIEEE 2008
Amount of oxalic acid present in a solution can be determined by its titration with $KMn{O_4}$ solution in the presence of ${H_2}S{O_4}.$ The titration gives unsatisfactory result when carried out in the presence of $HCl,$ because $HCl$ :
A.
gets oxidised by oxalic acid to chlorine
B.
furnishes ${H^ + }$ ions in addition to those from oxalic acid
C.
reduces permanganate to $M{n^{2 + }}$
D.
oxaidises oxalic acid to carbon doxide and water
2008 JEE Mains MCQ
AIEEE 2008
Larger number of oxidation states are exhibited by the actinoids than those by the lanthanoids, the main reason being :
A.
4f orbitals more diffused than the 5f orbitals
B.
lesser energy difference between 5f and 6d than between 4f and 5d orbitals
C.
more energy difference between 5f and 6d than between 4f and 5d orbitals
D.
more reactive nature of the actinoids than the lanthanoids
2007 JEE Mains MCQ
AIEEE 2007
The actinoids exhibits more number of oxidation states in general than the lanthanoids. This is because :
A.
the 5f orbitals are more buried than the 4f orbitals
B.
there is a similarity between 4f and 5f orbitals in their angular part of the wave function
C.
the actinoids are more reactive than the lanthanoids
D.
the 5f orbitals extend further from the nucleus than the 4f orbitals
2007 JEE Mains MCQ
AIEEE 2007
Identify the incorrect statement among the following :
A.
d-Block elements show irregular and erratic chemical properties among themselves
B.
La and Lu have partially filled d orbitals and no other partially filled orbitals
C.
The chemistry of various lanthanoids is very similar
D.
4f and 5f orbitals are equally shielded
2006 JEE Mains MCQ
AIEEE 2006
Lanthanoid contraction is caused due to :
A.
the appreciable shielding on outer electrons by 4f electrons from the nuclear charge
B.
the appreciable shielding on outer electrons by 5d electrons from the nuclear charge
C.
the same effective nuclear charge from Ce to Lu
D.
the imperfect shielding on outer electrons by 4f electrons from the nuclear charge
2006 JEE Mains MCQ
AIEEE 2006
A metal, $M$ forms chlorides in its $+2$ and $+4$ oxidation states. Which of the following statements about these chlorides is correct?
A.
$MC{l_2}$ is more ionic than $MC{l_4}$
B.
$MC{l_2}$ is more easily hydrolysed than $MC{l_4}$
C.
$MC{l_2}$ is more volatile than $MC{l_4}$
D.
$MC{l_2}$ is more soluble in anhydrous ethanol than $MC{l_4}$.
2006 JEE Mains MCQ
AIEEE 2006
The “spin-only” magnetic moment [in units of Bohr magneton, (µB)] of Ni2+ in aqueous solution would be : (Atomic number of Ni = 28)
A.
2.84
B.
4.90
C.
0
D.
1.73
2005 JEE Mains MCQ
AIEEE 2005
On heating mixture of $C{u_2}O$ and $C{u_2}S$ will give :
A.
$C{u_2}S{O_3}$
B.
$CuO + CuS$
C.
$Cu + S{O_3}$
D.
$Cu + S{O_2}$
2005 JEE Mains MCQ
AIEEE 2005
Calomel $\left( {H{g_2}C{l_2}} \right)$ on reaction with ammonium hydroxide gives :
A.
$HgO$
B.
$H{g_2}O$
C.
$N{H_2} - Hg - Hg - Cl$
D.
$HgN{H_2}Cl$
2005 JEE Mains MCQ
AIEEE 2005
The oxidation state of chromium in the final product formed the reaction between $K{\rm I}$ and acidified potassium dichromate solution is :
A.
$+3$
B.
$+2$
C.
$+6$
D.
$+4$
2005 JEE Mains MCQ
AIEEE 2005
Which of the following factors may be regarded as the main cause of lanthanide contraction?
A.
Poor shielding of one of 4f electron by another in the subshell
B.
Effective shielding of one of 4f electrons by another in the subshell
C.
Poorer shielding of 5d electrons by 4f electrons
D.
Greater shielding of 5d electrons by 4f electrons
2005 JEE Mains MCQ
AIEEE 2005
The lanthanide contraction is responsible for the fact that :
A.
Zr and Y have about the same radius
B.
Zr and Nb have similar oxidation state
C.
Zr and Hf have about the same radius
D.
Zr and Zn have the same oxidation
2004 JEE Mains MCQ
AIEEE 2004
Of the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one of them?
A.
$\left( {n - 1} \right){d^3}n{s^2}$
B.
$\left( {n - 1} \right){d^5}n{s^1}$
C.
$\left( {n - 1} \right){d^8}n{s^2}$
D.
$\left( {n - 1} \right){d^5}n{s^2}$
2004 JEE Mains MCQ
AIEEE 2004
Cerium (Z = 58) is an important member of the lanthanoids. Which of the following statements about cerium is incorrect?
A.
The common oxidation states of cerium are +3 and +4
B.
Cerium (IV) acts as an oxidizing agent
C.
The +4 oxidation state of cerium is not known in solutions
D.
The +3 oxidation state of cerium is more stable than the +4 oxidation state
2004 JEE Mains MCQ
AIEEE 2004
Excess of KI reacts with CuSO4 solution and then Na2S2O3 solution is added to it. Which of the statements is incorrect for this reaction?
A.
Cu2I2 is reduced
B.
Evolved I2 is reduced
C.
Na2S2O3 is oxidized
D.
CuI2 is formed
2003 JEE Mains MCQ
AIEEE 2003
What would happen when a solution of potassium chromate is treated with an excess of dilute nitric acid?
A.
$Cr_2O^{2-}_7$ and H2O are formed
B.
$CrO^{2-}_4$ is reduced to +3 state of Cr
C.
$CrO^{2-}_4$ is oxidized to +7 state of Cr
D.
Cr3+ and $Cr_2O^{2-}_7$ are formed
2003 JEE Mains MCQ
AIEEE 2003
The number of d-electrons retained in Fe2+ (At no of Fe = 26) ion is :
A.
4
B.
5
C.
6
D.
3
2003 JEE Mains MCQ
AIEEE 2003
A red solid is insolvable in water. However it becomes soluble if some $K{\rm I}$ is added to water. Heating the red solid in a test tube results in liberation of some violet colored fumes and droplets of a metal appear on the cooler parts of the test tube. The red solid is :
A.
$Hg{{\rm I}_2}$
B.
$HgO$
C.
$P{b_3}{O_4}$
D.
${\left( {N{H_4}} \right)_2}C{r_2}{O_7}$
2003 JEE Mains MCQ
AIEEE 2003
Which one of the following statements is correct?
A.
From a mixed precipitate of AgCl and AgI, ammonia solution dissolves only AgCl
B.
Ferric ions give a deep green precipitate on adding potassium ferrocyanide solution
C.
On boiling a solution having K+, Ca2+ and HCO3 ions we get a precipitate of K2Ca(CO3)2.
D.
Manganese salts give a violet borax bead test in the reducing flame
2003 JEE Mains MCQ
AIEEE 2003
Which one of the following nitrates will leave behind a metal on strong heating?
A.
Copper nitrate
B.
Manganese nitrate
C.
Silver nitrate
D.
Ferric nitrate
2003 JEE Mains MCQ
AIEEE 2003
The atomic numbers of vanadium (V), Chromium (Cr), manganese (Mn) and iron (Fe) are respectively 23, 24, 25 and 26. Which one of these may be expected to have the highest second ionization enthalpy?
A.
Cr
B.
Mn
C.
Fe
D.
V
2003 JEE Mains MCQ
AIEEE 2003
For making good quality mirrors, plates of float glass are used. These are obtained by floating molten glass over a liquid metal which does not solidify before glass. The metal used can be :
A.
tin
B.
sodium
C.
magnesium
D.
mercury
2003 JEE Mains MCQ
AIEEE 2003
The radius of La3+ (Atomic number of La = 57) is 1.06 Å. Which one of the following given values will be closest to the radius of Lu3+ (Atomic number of Lu = 71) ?
A.
1.60 Å
B.
1.40 Å
C.
0.85 Å
D.
1.60 Å
2002 JEE Mains MCQ
AIEEE 2002
How do we differentiate between Fe3+ and Cr3+ in group III?
A.
by taking excess of NH4OH solution
B.
by increasing $NH_4^+$ ion concentration
C.
by decreasing OH- ion concentration
D.
both (b) and (c)
2002 JEE Mains MCQ
AIEEE 2002
Most common oxidation states of Ce (cerium) are :
A.
+3, +4
B.
+2, +3
C.
+2, +4
D.
+3, +5
2002 JEE Mains MCQ
AIEEE 2002
When KMnO4 acts as an oxidising agent and ultimately forms [MnO4]-2, MnO2, Mn2O3, Mn+2 then the number of electrons transferred in each case respectively is :
A.
4, 3, 1, 5
B.
1, 5, 3, 7
C.
1, 3, 4, 5
D.
3, 5, 7, 1
2002 JEE Mains MCQ
AIEEE 2002
Which of the following ions has the maximum magnetic moment?
A.
Mn2+
B.
Fe2+
C.
Ti2+
D.
Cr2+