Fire extinguishers contain $H_{2}S{O}_4$ and __ _

1. ${\mathrm{NaHCO}}_3$ and ${\mathrm{Na}}_2{\mathrm{Co}}_3$

2. ${\mathrm{NaHCO}}_3$ solution

3. ${\mathrm{Na}}_2{\mathrm{Co}}_3$

4. ${\mathrm{CaCO}}_3$

Sodium nitrate decomposes above 800°C and does not give:

1. ${\mathrm{N}}_2$

2. ${\mathrm{O}}_2$

3. ${\mathrm{NO}}_2$

4. Na₂O

On heating sodium metal in a current of dry ammonia gas the compound formed is:

(1) sodium nitrate

(2) sodium hydride

(3) sodium amide

(4) sodium azide

The electrolyte employed in the extraction of sodium by Down's electrolysis method is:

(1) An aqueous solution of NaCl

(2) Molten NaCl

(3) Molten NaOH

(4) A molten mixture of ${\mathrm{MgCl}}_2$, and NaCl

Which statement is false for alkali metals?

(1) Lithium is the strongest reducing agent

(2) Sodium is amphoteric in nature

(3) Li⁺ is exceptionally small

(4) All alkali metals give blue solution in liquid ammonia

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. $\mathrm{NaOH},\mathrm{CaO}\text{\hspace{0.17em}and\hspace{0.17em}}{\mathrm{NH}}_3$

2. ${\mathrm{Na}}_2{\mathrm{CO}}_3,{\mathrm{CaCO}}_3\text{\hspace{0.17em}and\hspace{0.17em}}{\mathrm{NH}}_3$

3. ${\mathrm{Na}}_2{\mathrm{SO}}_4,{\mathrm{CaCO}}_3\text{\hspace{0.17em}and\hspace{0.17em}}{\mathrm{NH}}_3$

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. ${\mathrm{KIO}}_3$