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CrO₄^2- (yellow) changes to Cr₂O₇^2- (orange) in pH = x and vice versa in pH = y.
The value of x and y will be:
1. 6, and 8
2. 6, and 5
3. 8, and 6
4. 7, and 7

Which of the following solid salt on heating with K₂Cr₂O₇ and Conc. H₂SO₄ orange,red vapours are evolved which turn aquous NaOH solution yellow?
1. NaBr
2. NaCl
3. NaNO₃
4. NaI

With F highest stable oxidation state of Mn is
1. +6
2. +4
3. +7
4. +3

The correct electronic configuration of Gadolinium(Atomic number = 64)  is :
1. [Xe]4f⁸6d²                   
2. [Xe]4f⁹5s¹
3. [Xe]4f⁷5d¹6s²                   
4. [Xe]4f⁶5d²6s²

KMnO₄ can be prepared from K₂MnO₄ as per reaction
$3{\mathrm{MnO}}_4^{2-} + 2{\mathrm{H}}_2\mathrm{O}\rightleftharpoons 2{\mathrm{MnO}}_4^{-} + {\mathrm{MnO}}_2 + 4{\mathrm{OH}}^{-}$
The reaction can go to completion by removing OH^- ions by adding
1. HCl
2. KOH
3. CO₂
4. SO₂

Which of the following species is colourless?
1. ${\mathrm{TiF}}_6^{2-}$ and ${\mathrm{CoF}}_6^{3-}$ 
2. Cu₂Cl₂  and ${\mathrm{NiCl}}_4^{2-}$
3. ${\mathrm{TiF}}_6^{2-}$ and Cu₂Cl₂ 
4. ${\mathrm{CoF}}_6^{3-}$ and ${\mathrm{NiCl}}_4^{2-}$ 

A mixture of Mn²⁺ & Zn²⁺ can be separated by using an excess of
(1) NH₄OH
(2) NaOH
(3) H₂SO₄
(4) HNO₃

The hardest lanthanide  is
1. La
2. Lu
3. Sm
4. Yb

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

The number of moles of Mohr's salt required per mole of dichromate ion is:
(1) 3
(2) 4
(3) 5
(4) 6

The lanthanide contraction is responsible for the fact that:
1. Zr and Y have about the same radius .
2. Zr and Zn have the same oxidation state.  
3. Zr and Hf have about the same atomic radius .
4. Zr and Nb have a similar oxidation state.

Actinoids show a greater number of oxidation states than lanthanoids because: