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 Alkali metal with the lowest melting point is -
1. Na
2. K
3. Rb
4. Cs

Sodium in liquid ammonia is used as :
1. Oxidizing agent .
2. Reducing agent.
3. Hydrolyzing agent.
4. Precipitating agent.

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

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. ${\mathrm{CaCO}}_3$

Which one of the following compounds is a peroxide?
1. $K{O}_2$
2. $Ba{O}_2$
3. $Mn{O}_2$
4. $N{O}_2$

Which salt will not impart color to flame?
1. LiCl
2. MgCl₂
3. CaCl₂
4. KI

Microcosmic salt has the formula:
1. Na₂HPO₄.2H₂O
2. (NH₄)₂HPO₄.2H₂O
3. Na(NH₄)HPO₄.4H₂O
4. none of these

The formula of washing soda is:
1. Na₂CO₃
2. Na₂CO₃.H₂O
3. Na₂CO₃.7H₂O
4. Na₂CO₃.10H₂O

The element which does not dissolve in caustic soda is:
1. silicon
2. aluminium
3. zinc
4. cadmium

Sodium burns in dry air to give:
1. Na₂O
2. Na₂O₂
3. NaO
4. Na₃N

KO₂ is used in oxygen cylinder in space air craft and submarines because it:
1. absorbs CO₂ and increase O₂ content
2. eliminate moisture
3. absorbs CO₂
4. produces O₂

Hypo is chemically:
1. Na₂S₂O₃.2H₂O
2. Na₂S₂O₃.3H₂O
3. Na₂S₂O₃.4H₂O
4. Na₂S₂O₃.5H₂O

Highly soluble hydroxide in water is formed by -
1. Ni²⁺
2. K⁺
3. Zn²⁺
4. Al³⁺