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?