An alkali metal that reacts with nitrogen to form nitride is -

1. Li

2. Na

3. Cs

4. None of the above.

Sodium does not form Na²⁺ ,because:

1. Sodium contains only one electron in its outermost shell

2. First ionization potential is small and the difference in first and second ionization potential is very large.

3. Radius of Na⁺² is much smaller than of Na⁺

4. None of the above.

Baking soda or baking powder is:

1. Washing soda

2. Caustic soda

3. Soda ash

4. Sodium bicarbonate

The formula of washing soda is:

1. Na₂CO₃

2. Na₂CO₃.H₂O

3. Na₂CO₃.7H₂O

4. Na₂CO₃.10H₂O

Alkali metals are characterised by:

1. Good conductors of heat and electricity.

2. High melting points.

3. Low oxidation potentials.

4. High ionisation potentials.

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.

The strongest reducing agent among the following is:

1. K

2. Na

3. Al

4. Mg

An ion that has the largest size among the following is :

1. Li⁺(aq)

2. Cs⁺(aq)

3. Li⁺(g) 

4. K⁺(aq)

The incorrect statement among the following is-

1. Lithium is the strongest reducing agent.

2. Density of potassium is more than sodium.

3. Cs are used in devising photoelectric cells.

4. All alkali metals give a blue solution in liquid ammonia.

A colourless salt among the following that gives violet colour to Bunsen flame is -

1. Na₂CO₃

2. K₂CO₃

3. Cu(OH)₂

4. MgCO₃