Brine is chemically:

1. conc. solution of Na₂CO₃

2. conc. solution of Na₂SO₄

3. conc. solution of NaCl

4. conc. solution of alum

NO₂ is obtained by heating:

1. CsNO₃

2. KNO₃

3. LiNO₃

4. NaNO₃

Soda lime is:

1. Na₂CO₃ + CaO

2. NaOH + NaHCO₃

3. NaOH + CaO

4. NaH + Na₂CO₃

Molecular formula of Glauber's salt is :

1. MgSO₄$·$7H₂O

2. CuSO₄$·$5H₂O

3. FeSO₄$·$7H₂O

4. Na₂SO₄$·$10H₂O

Among the following, which has minimum solubility in water?

1. KOH

2. CsOH

3. LiOH

4. RbOH

Common table salt becomes moist and does not pour easily in rainy season because:

1. It contains magnesium chloride.

2. It contains magnesium carbonate.

3. It melts slightly in rainy season.

4. Sodium chloride is hygroscopic.

A  mixture of Al(OH)₃ and Fe(OH)₃ can be separated easily by treating it with:

1. HCl

2. NH₄OH

3. HNO₃

4. NaOH

Alkali metals are characterised by:

1. Good conductors of heat and electricity.

2. High melting points.

3. Low oxidation potentials.

4. High ionisation potentials.

Excess of dilute sodium hydroxide solution is gradually added with shaking to an aqueous solution of zinc sulphate. What would you observe?

1. A light blue precipitate is first formed which finally dissolves to give a deep blue solution

2. A white precipitate appears which dissolves to give a colourless solution.

3. A white precipitation is formed which does not dissolve 

4. No change takes place and the solution remains clear

Which has lowest thermal stability?

1. Li₂CO₃

2. Na₂CO₃

3. K₂CO₃

4. Rb₂CO₃