Among the following the correct order of acidity is-

1. HClO < HClO₂< HClO₃< HClO₄
2. HClO₂< HClO < HClO₃< HClO₄
3. HClO₄< HClO₂< HClO < HClO₃
4. HClO₃< HClO₄< HClO₂< HClO

Which of the following reactions are disproportionation reactions?

(a) ${\mathrm{Cu}}^{+}\to {\mathrm{Cu}}^{2+}+\mathrm{Cu}$

(b) $3{\mathrm{MnO}}_4^{2-}+4{\mathrm{H}}^{+}\to 2{\mathrm{MnO}}_4^{-}+{\mathrm{MnO}}_2+2{\mathrm{H}}_2\mathrm{O}$

(c) $2{\mathrm{KMnO}}_4\to {\mathrm{K}}_2{\mathrm{MnO}}_4+{\mathrm{MnO}}_2+{\mathrm{O}}_2$

(d) $2{\mathrm{MnO}}_4^{-}+3{\mathrm{Mn}}^{2+}+2{\mathrm{H}}_2\mathrm{O}\to 5{\mathrm{MnO}}_2+4{\mathrm{H}}^{+}$

1. a, b

2. a, b, c

3. b, c, d

4. a, d

1.520g of the hydroxide of a metal on ignition gave 0.995 g of oxide. The equivalent mass of metal is:

1. 1.520

2. 0.995

3. 19.00

4. 9.00

0.5 g of fuming H₂SO₄ (oleum) is diluted  with water. This solution is completely neutralised by 26.7 mL of 0.4 N NaOH. The percentage of free SO₃ in the sample is:

1. 30.6% 

2. 40.6%

3. 20.6%

4. 50%

In which of the following processes nitrogen is oxidised?

1. ${\mathrm{NH}}_4^{+}$ $\to$N₂

2. ${\mathrm{NO}}_3^{-} \to$NO

3. NO₂ $\to$${\mathrm{NO}}_2^{-}$

4. ${\mathrm{NO}}_3^{-}$$\to$N${\mathrm{H}}_4^{+}$ 

In the preparation of chlorine from HCl; MnO₂ acts as:

1. Reducing agent

2. Oxidising agent

3. Catalytic agent

4. Dehydrating agent

Oxidation number of carbon in C₃O₂, Mg₂C₃ are respectively:

1. -4/3, +4/3 

2. +4/3, -4/3

3. -2/3, +2/3

4. -2/3, +4/3

The oxidation number and covalency of sulphur in the sulphur molecule (S₈) are respectively:

1. 0, and 2

2. +6, and 8

3. 0, and 8

4. +6, and 2

Hypochlorite disproportionate to give

1. Cl^- and Cl${\mathrm{O}}_4^{-}$

2. Cl${\mathrm{O}}_4^{-}$ and Cl${\mathrm{O}}_3^{-}$

3. Cl${\mathrm{O}}_3^{-}$ and Cl^-

4. Cl${\mathrm{O}}_2^{-}$ and Cl^-

When Cl₂ is converted into Cl^- & Cl${\mathrm{O}}_3^{-}$ then n-factor of Cl₂ will be:

1. 3/5

2. 5/3

3. 7/2

4. 2