The correct  sequence of increasing order of density is:

1. Li < K< Na < Rb < Cs

2. Li < Na < K < Rb < Cs

3. Cs < Rb < K < Na < Li

4. K < Li < Na < Rb < Cs

Highly soluble hydroxide in water is formed by -

1. Ni²⁺

2. K⁺

3. Zn²⁺

4. Al³⁺

The strongest reducing agent among the following is:

1. K

2. Na

3. Al

4. Mg

When crystal of caustic soda is exposed to air, a liquid layer is deposited because:

1. crystal melts

2. crystal loses water

3. crystal absorbs moisture and CO₂

4. crystal sublimes

Which one of the following is formed on dissolving I₂ in aqueous solution of KI ?

1. KIO₄

2. KIO

3. KI₃

4. KIO₃

Brine is chemically:

1. conc. solution of Na₂CO₃

2. conc. solution of Na₂SO₄

3. conc. solution of NaCl

4. conc. solution of alum

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.

The products of the electrolysis of aqueous solution of common salt are:

1. Na + Cl₂

2. H₂ + O₂

3. NaOH + H₂ + Cl₂

4. NaOH + Cl₂ + O₂