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
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
Actinide contraction is
mainly related to:
1. Poor shielding by 5f subshell
2. Extraordinary decrement in Zeff
3. Both (1) and (2)
4. Strong shielding by 5f subshel
The ionization potential values of d-block elements as compared to the ionization potential values of f-block elements are:
1. | Higher | 2. | Equal |
3. | Lower | 4. | Can't compare. |
A gas that can readily decolorize an acidified KMnO4 solution is:
1.
2.
3.
4.
1. | [Xe] 4f6 5d1 6s2, [Xe]4f7 5d1 6s2, and [Xe] 4f9 6s2
|
2. | [Xe] 4f6 5d1 6s2, [Xe] 4f75d1 6s2, and [Xe]4f8 5d1 6s2
|
3. | [Xe] 4f7 6s2, [Xe]4f7 5d1 6s2, and [Xe] 4f9 6s2
|
4. | [Xe] 4f7 6s2, (Xe]4f8 6s2, and [Xe]4f8 5d1 6s2 |
Which of the following statements is false?
1. | On passing H2S through acidified K2Cr2O7 solution, a milky colour is observed. |
2. | Na2Cr2O7 is preferred over K2Cr2O7 in volumetric analysis. |
3. | K2Cr2O7 solution in an acidic medium is orange. |
4. | K2Cr2O7 solution becomes yellow in increasing the pH beyond 7 |
Which one of the following is a diamagnetic ion?
1. | La3+ | 2. | Lu3+ |
3. | Ce4+ | 4. | All of the above. |
Which of the following statements is false?
1. | V2+ < Cr2+ < Mn2+ < Fe2+ : Paramagnetic behaviour |
2. | Ni2+ < Co2+ < Fe2+ < Mn2+ : Ionic size |
3. | Co3+ < Fe3+ < Cr3+ < Sc3+ : Stability in aqueous solution |
4. | Sc < Ti < Cr < Mn : Number of oxidation states |
An element that does not show variable oxidation state is:
1. | Fe | 2. | Mn |
3. | Cu | 4. | Zn |