An aqueous solution of a salt of sodium (NaX) on boiling with ${\mathrm{MgCl}}_2$ gives white precipitate, hence anion X is:

1. ${\mathrm{HCO}}_3^{-}$

2. ${\mathrm{NO}}_3^{-}$

3. ${\mathrm{CO}}_3^{2-}$

4. ${\mathrm{SO}}_3^{2-}$

The process associated with sodium carbonate manufacture is known as........... process.

(1) Chamber

(2) Haber

(3) Leblanc

(4) Castner

When sulfur is heated with NaOH(aq) the compounds formed are:

1. ${\mathrm{Na}}_2\mathrm{S}+{\mathrm{H}}_2\mathrm{O}$

2. ${\mathrm{Na}}_2{\mathrm{SO}}_3+{\mathrm{H}}_2\mathrm{O}$

3. ${\mathrm{Na}}_2\mathrm{S}+{\mathrm{Na}}_2{\mathrm{S}}_2{\mathrm{O}}_3+{\mathrm{H}}_2\mathrm{O}$

4. ${\mathrm{Na}}_2{\mathrm{S}}_2{\mathrm{O}}_3+{\mathrm{H}}_2\mathrm{O}$

The raw materials in the Solvay process are

1. $\mathrm{NaOH},\mathrm{CaO}\text{ and }{\mathrm{NH}}_3$

2. ${\mathrm{Na}}_2{\mathrm{CO}}_3,{\mathrm{CaCO}}_3\text{ and }{\mathrm{NH}}_3$

3. ${\mathrm{Na}}_2{\mathrm{SO}}_4,{\mathrm{CaCO}}_3\text{ and }{\mathrm{NH}}_3$

4. $\mathrm{NaCl},{\mathrm{NH}}_3,{\mathrm{CaCO}}_3$

Which one of the following is formed on dissolving ${\mathrm{I}}_2$ in the aqueous solution of KI?

1. ${\mathrm{KIO}}_4$

2. KIO

3. ${\mathrm{KI}}_3$

4. ${\mathrm{KIO}}_3$

Lithium is the strongest reducing agent among alkali metals due to which of the following factor

(1) ionization energy

(2) Electron affinity

(3) Hydration energy

(4) Lattice energy

Among the following, which has minimum solubility in water?

(1) KOH

(2) CsOH

(3) LiOH

(4) RhOH

When KCI is heated with conc. ${\mathrm{H}}_2{\mathrm{SO}}_4$ and solid ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ we get:

(1) chromyl chloride

(2) chromous chloride

(3) chromic chloride

(4) chromic oxide

Sodium thiosulphate is formed when:

(1) NaOH is neutralized by ${\mathrm{H}}_2{\mathrm{SO}}_4$

(2) ${\mathrm{Na}}_2\mathrm{S}$ is boiled with S

(3) ${\mathrm{Na}}_2{\mathrm{SO}}_3$ is boiled with ${\mathrm{Na}}_2\mathrm{S}$ and ${\mathrm{I}}_2$

(4) ${\mathrm{Na}}_2{\mathrm{SO}}_4$ is boiled with ${\mathrm{Na}}_2\mathrm{S}$

Which of the following statements is correct for ${\mathrm{CsBr}}_3$?

(1) It is a covalent compound

(2) It contains ${\mathrm{Cs}}^{2+}$ and ${\mathrm{Br}}^{-}$ ions

(3) It contains ${\mathrm{Cs}}^{+}, {\mathrm{Br}}^{-}$, and ${\mathrm{Br}}_2$ lattice molecules

(4) It contains ${\mathrm{Cs}}^{+}$ and ${\mathrm{Br}}_3^{-}$ ions