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

1.	Yb2+	2.	Ho3+
3.	Sm2+	4.	Gd3+

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

Select the correct statement(s) among the following

(1) CeS is used for making crucibles

(2) Hybridisation of Mn in KMnO₄ is sp³

(3) CO^2-₃ and HCO^-₃ ions can be distinguished by using AgNO₃

(4) All of these

The correct statement is

(1) Green vitriol and blue vitriol are isomorphous

(2) KMnO₄ and K₂Cr₂O₇ are coloured due to d-d transitions

(3) Cu₂Cl₂ and Ag₂S are coloured

(4) Upon strong heating paramagnetic gases are evolved by CuSO₄ and AgNO₃

Which is true about ionic radius of M²⁺?

(1) Ni²⁺<Cu²⁺<Zn²⁺

(2) Ni²⁺>Cu²⁺>Zn²⁺

(3) Cu²⁺<Ni²⁺<Zn²⁺

(4) Zn²⁺<Ni²⁺<Cu²⁺

Which of the following will not give a positive chromyl chloride test?

(1) CuCl₂

(2) ZnCl₂

(3) HgCl₂

(4) NH₄Cl

What is the n-factor ratio when KMnO₄ reacts with conc. HCl?

(1) 3:4

(2) 8:1

(3) 16:1

(4) 2:1

Which of the following can not exist together in aqueous solution?

(1) HgCl₂ and SnCl₂

(2) HgCl₂ and SnCl₄

(3) SnCl₄ and FeCl₃

(4) SnCl₄ and PbCl₄

A substance is found to have a magnetic moment of 3.9 B.M. The ion may be 

(1) Fe⁺³

(2) Mn⁺²

(3) Co⁺²

(4) Cu⁺²

When an excess of KCN is added to a solution of CuSO₄, the final product obtained is :

1. K₂[Cu(CN)₄]

2. K₃[Cu(CN)₄]

3. CuCN

4. K[Cu(CN)₂]