CuSO4 (aq.)MN+O
Then final products N and O are respectively.
1. [Cu(CN)4]3-,(CN)2
2. CuCn,(CN)2
3. [Cu(CN)4]2-,(CN)2
4. Cu(CN)2,K2S
Consider the following transformation:
2CuX22CuX+X2
Then X- can be :
1. F-,Br-
2. Cl-,Br-
3. CN-
4. Cl-,F-
Fe is made passive by :
1. dil . H2SO4
2. dil. HCl
3. Conc. HNO3
4. Conc. H2SO4
Which element among the following has the highest melting point?
1. Cr
2. Fe
3. Cu
4. Mo
With F highest stable oxidation state of Mn is
1. +6
2. +4
3. +7
4. +3
Lanthanoid which is radioactive is:
1. Promethium
2. Europium
3. Plutonium
4. Neptunium
From the following, which is the most basic hydroxide?
1. Ce(OH)3
2. Lu(OH)3
3. Yb(OH)3
4. Tb(OH)3
The main reason for a larger number of oxidation states exhibited by the actinoids than the corresponding lanthanoids is
1. The lesser energy difference between 5f and 6d orbitals than 4f and 5d orbitals
2. Larger atomic size of actinoids than the lanthanoids
3. More energy difference between 5f and 6d orbitals than between 4f and 5d orbitals
4. Greater reactive nature of the actinoids than the lanthanoids
In the dichromate ion Cr2O72-,
1. 4 Cr-O bonds are equivalent
2. 6 Cr-O bonds are equivalent
3. All Cr-O bonds are equivalent
4. None of Cr-O bonds are equivalent
Magnetic moment of K3[Fe(CN)5(H2O)] is
1. 0
2. 4.92
3. 3.87
4. 2.83
HgCl2 and I2 both when dissolved in water containing I- ions the pair of species formed is
(a) HgI2, (b) HgI2, I-
(c) (d) Hg2I2, I-
Because of lanthanoid contraction, which of the following pairs of elements have nearly
same atomic radii? (Numbers in the parenthesis are atomic numbers).
1. Ti (22) and Zr (40)
2. Zr (40) and Nb (41)
3. Zr (40) and Hf (72)
4. Zr (40) and Ta (73)
Which of the following processes does not involve oxidation of iron?
1. Rusting of iron sheets
2. Decolourisation of blue CuSO4 solution by iron
3. Formation of Fe(CO)5 from Fe
4. Liberation of H2 from steam by iron a high temperature
The correct electronic configuration of Gadolinium(Atomic number = 64) is :
1. [Xe]4f86d2
2. [Xe]4f95s1
3. [Xe]4f75d16s2
4. [Xe]4f65d26s2
Assuming complete ionisation, same moles of which of the following compounds will
require the least amount of acidified KMnO4 for complete oxidation?
1. FeSO4
2. FeSO3
3. FeC2O4
4. Fe(NO2)2
The reason for lanthanoid contraction is:
1. Negligible screening effect of 'f' orbitals
2. Increasing nuclear charge
3. Decreasing nuclear charge
4. Decreasing screening effect
A diamagnetic lanthanoid ion among the following is :
(At. numbers: Ce = 58, Sm = 62, Eu = 63, Yb = 70)
1. Ce2+
2. Eu2+
3. Sm2+
4. Yb2+
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. no.
Cr=24;Mn=25&Fe=26,Co=27)
1. Fe>Mn>Co>Cr
2. Co>Mn>Fe>Cr
3. Cr>Mn>Co>Fe
4. Mn>Cr>Fe>Co