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 |
A pair among the following that has both coloured ions in the aqueous solution is-
(At. no : Sc =21, Ti = 22, Ni = 28, Cu = 29, Co = 27)
1. | Ni2+, Ti3+ | 2. | Sc3+, Ti3+ |
3. | Sc3+, Co2+ | 4. | Ni2+, Cu+ |
The increasing order of oxidising power among the following species is :
1.
2.
3.
4.
The values of X, Y, P, and Q are, respectively:
1. , Mn2O7, conc. H2SO4, and K2MnO4
2. K2MnO4, conc. H2SO4, Mn2O7, and
3. Na2CO3, MnO2, K2MnO4, and Mn2O7
4. H+, K2MnO4, , and Mn2O7
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 |
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 |
A gas that can readily decolorize an acidified KMnO4 solution is:
1.
2.
3.
4.
The incorrect statement among the following is:
1. | There is a decrease in the radii of the atoms or ions as one proceeds from La to Lu. |
2. | Lanthanoid contraction is the accumulation of successive shrinkages. |
3. | As a result of lanthanoid contraction, the properties of the 4d series of the transition elements have no similarities with the 5d series of elements. |
4. | The shielding power of 4f electrons is quite weak. |