Which one of the following is a diamagnetic ion?
1. | La3+ | 2. | Lu3+ |
3. | Ce4+ | 4. | All of the above. |
Which of the following elements has the highest second ionization enthalpy ?
1. Cr
2. Mn
3. Fe
4. Ti
The fusion of chromite ore (FeCr2O4) with Na2CO3 in air gives a yellow solution upon the addition of water. Subsequent treatment with H2SO4 produces an orange solution.
The yellow and orange colours, respectively, are due to the formation of:
1. Na2CrO4 and Na2Cr2O7
2. Cr(OH)3 and Na2Cr2O7
3. Cr2(CO3)3 and Fe2(SO4)3
4. Cr(OH)3 and Na2CrO4
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 |
The pairs having similar magnetic moments are:
1. | Ti3+, V3+ | 2. | Cr3+, Mn2+ |
3. | Mn2+, Fe3+ | 4. | Fe2+, Mn2+ |
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.
Which of the following ions has the most unpaired electrons?
1. | Fe2+ | 2. | Fe3+ |
3. | Co3+ | 4. | Co2+ |
What is the correct electronic configuration of Ti (Z = 22 atoms)?
1.
2.
3.
4.