The D And F Block Elements
Time: 30 Minute
- 1.Which of the following oxidation state is common for all lanthanoids?
- A.
+ 2
- B.
+ 3
- C.
+ 4
- D.
+ 5
- 2.Interstitial compounds are formed when small atoms are trapped inside the crystal lattice of metals. Which of the following is not the characteristic property of interstitial compounds?
- A.
They have high melting points in comparison to pure metals
- B.
They are very hard
- C.
They retain metallic conductivity
- D.
They are chemically very reactive
- 3.When acidified K2Cr2O7 solution is added to Sn2+ salts, then Sn2+ changes to:
- A.
Sn
- B.
Sn3+
- C.
Sn4+v
- D.
Sn+
- 4.
![Metallic radii of some transition elements are given below. Which of these elements will have highest density?
- ProProfs]( "Metallic radii of some transition elements are given below. Which of these elements will have highest density?")
Metallic radii of some transition elements are given below. Which of these elements will have highest density?- A.
Fe
- B.
Ni
- C.
Co
- D.
Cu
- 5.A student accidently added conc. H2SO4 to potassium permagnate and it exploded due to the formation of an explosive which is:
- A.
MnO
- B.
Mn2O3
- C.
Mn2O5
- D.
Mn2O7
- 6.KMnO4 acts an oxidizing agent in alkaline medium. When alkaline KMnO4 is treated with KI, iodide ion is oxidesed to:
- A.
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- B.
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- C.
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- D.
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- 7.A transition metal exists in its highest oxidation state. It is expected to behave as:
- A.
A chelating agent
- B.
A central metal in a coordination compound
- C.
An oxidizing agent
- D.
A reducing agent
- 8.For successive transition elements (Cr, Mn, Fe and Co), the stability of +2 oxidation state will be there in which of the following order?
- A.
Cr > Mn > Co > Fe
- B.
Mn > Fe > Cr > Co
- C.
Fe > Mn > Co > Cr
- D.
Co > Mn > Fe > Cr
- 9.The colour of light absorbed by an aqueous solution of CuSO4 is
- A.
Orange-red
- B.
Blue-green
- C.
Yellow
- D.
Violet
- 10.When hydrogen peroxide is added to acidified potassium dichromate, a blue colour is produced due to the formation of:
- A.
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- B.
![]()
- C.
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- D.
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- 11.Lanthanoid contraction is observed in:
- A.
Gd
- B.
At
- C.
Xe
- D.
Ac
- 12.Ammonium dichromate is used in fireworks. The green coloured powder blown in the air is:
- A.
CrO3
- B.
Cr2O3
- C.
Cr
- D.
CrO (O2
- 13.Which of the following lanthanoid ion is paramagnetic?
- A.
Ce4+
- B.
Option 2Yb2+
- C.
Lu3+
- D.
4Eu2+
- 14.All Cu (II) halidesknown except iodide. The reason for this is that:
- A.
Iodide ion is a bulky ion
- B.
Cu2+ oxidizes iodide to iodine
- C.
Cu2+ (aq.) has much more negative hydration enthalpy
- D.
Cu2+ ion has smaller size
- 15.The actinoid exhibit more number of oxidation states in general than the lanthanoids. This is because:
- A.
The 5f orbitals extend farther from the nucleus than the 4f orbitals
- B.
The 5f orbitals are more buried than the 4f orbitals
- C.
There is a similarity between the 4f and 5f orbitals in their angular part of the wave function
- D.
The actinoids are more reactive than the lanthanoids
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