KMnO₄ can be prepared from K₂MnO₄ as per reaction,

 $3{\mathrm{MnO}}_4^{2-}<mspace\; width="1em"></mspace>+<mspace\; width="1em"></mspace>2{\mathrm{H}}_2\mathrm{O}<mspace\; width="1em"></mspace>\rightleftharpoons <mspace\; width="1em"></mspace>2{\mathrm{MnO}}_4^{-}<mspace\; width="1em"></mspace>+<mspace\; width="1em"></mspace>{\mathrm{MnO}}_2<mspace\; width="1em"></mspace>+<mspace\; width="1em"></mspace>4{\mathrm{OH}}^{-}$

The reaction can go to completion by removing OH^- ions by adding             

1. HCl

2. KOH

3. CO₂

4. SO₂

10 gm CaCO₃ is taken in a one litre container. The active mass of CaCO₃ is: 

1. 0.1

2. 1

3. zero

4. 10

What can be the active mass of CaCO₃ if 10 grams of CaCO₃ are taken in a one-liter container?
[Given: Molecular weight of CaCO₃ = 100]

1. 0.1 

2. 1 

3. 0.01 

4. 10

The equilibrium constant of the reaction A₂(g) + B₂(g) $\rightleftharpoons$ 2AB (g) at 100ºC is 50.  If a one litre flask containing one mole of A₂ is connected to a two litre flask containing two moles of B₂, how many moles of AB will be formed at 373 K ?

1. 2.8

2. 1.9

3. 2.1

4. 3.6

The increasing order of basic strength of Cl^-, ${\mathrm{CO}}_3^{2-}<mspace\; width="1em"></mspace>$, CH₃COO^-, OH^-, F^- is:

1. Cl^-<F^-<CH₃COO^-<${\mathrm{CO}}_3^{2-}<mspace\; width="1em"></mspace>$<OH^-

2.  Cl^-<F^-< ${\mathrm{CO}}_3^{2-}<mspace\; width="1em"></mspace>$<CH₃COO^-<OH^-

3. CH₃COO^-<Cl^-<F^-<${\mathrm{CO}}_3^{2-}<mspace\; width="1em"></mspace>$<OH^-

4. none of the above

Which of the following compounds is in the correct sequence in terms of relative basic strength?

1. \(C_{2} H_{5} O^{-} > CH \equiv C^{-} > \left(OH\right)^{-}\)

2. \(CH \equiv C^{-} >(OH)^{-} > C_{2} H_{5} O^{-}\)

3. \(CH \equiv C^{-} > C_{2} H_{5} O^{-} > \left(OH\right)^{-}\)

4. \(C_{2} H_{5} O^{-} > \left(OH\right)^{-} > CH \equiv C^{-}\)

Among the following examples, the species that behave(s) as a Lewis acid is/are: 
\(\mathrm{BF}_3, \mathrm{SnCl}_2, \mathrm{SnCl}_4\)

1. Stannous chloride, Stannic chloride
2. $B{F}_3$, Stannous chloride
3. Only $B{F}_3$
4. $B{F}_3$, Stannous chloride, Stannic chloride