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:

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

The unpaired electron in Eu³⁺ will bear similarities to that found in :

The values of X, Y, P, and Q are, respectively:
   

1. ${\mathrm{MnO}}_3^{+}$, Mn₂O₇, conc. H₂SO₄, and K₂MnO₄

2. K₂MnO₄, conc. H₂SO₄, Mn₂O₇, and ${\mathrm{MnO}}_3^{+}$

3. Na₂CO₃, MnO₂, K₂MnO₄, and Mn₂O₇

4. H⁺, K₂MnO₄, ${\mathrm{MnO}}_3^{+}$, and Mn₂O₇

The element that has a maximum composition in Mischmetal and is used in the gas lighters is:

Which of the following statements is false?