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? 

An element that does not show variable oxidation state is:

The pairs having similar magnetic moments are:

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)

 The increasing order of oxidising power among the following species is :

1. ${{\mathrm{VO}}_2}^{+}< {\mathrm{Cr}}_2{{\mathrm{O}}_7}^{2- }< {{\mathrm{MnO}}_4}^{-}$                           

2. ${{\mathrm{VO}}_2}^{+ }< {{\mathrm{MnO}}_4}^{- }< {\mathrm{Cr}}_2{{\mathrm{O}}_7}^{2-}$

3. ${\mathrm{Cr}}_2{{\mathrm{O}}_7}^{2- }< {{\mathrm{VO}}_2}^{+ }< {{\mathrm{MnO}}_4}^{-},$                           

4. ${\mathrm{Cr}}_2{{\mathrm{O}}_7}^{2- }< {{\mathrm{MnO}}_4}^{- }< {{\mathrm{VO}}_2}^{+}$

Which of the following ions has the most unpaired electrons?

What is the correct electronic configuration of Ti (Z = 22 atoms)?

1. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^2$

2. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{2}4p^6$

3. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^4$

4. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^2$