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At pH = X, \(\text{CrO}_4^{2-}\)​ (yellow) changes to \(\text{Cr}_2\text{O}_7^{2-}\) (orange), and vice versa at pH = Y.
What are the values of X and Y, respectively?
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

Which lanthanide element is known to be the hardest?
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

Which of the following is a result of the lanthanide contraction?
1. Zr and Y have nearly the same atomic radius.
2. Zr and Zn have the same oxidation state. 
3. Zr and Hf have nearly the same atomic radius.
4. Zr and Nb have similar oxidation states.

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