Which of the alkali metal chloride (MCl) forms its dehydrate  (MCl.$2H_{2}O$) easily?

1. LiCl

2. CsCl

3. RbCl

4. KCl

The cation of alkali metals are found as M(H₂O)⁺_n in H₂O.

The value of 'n' is maximum for -

1. Na⁺

2. K⁺

3. Rb⁺

4. Li⁺

$∆{\mathrm{H}}_{\mathrm{solution}}$ is positive for

I. LiF

II. CsI

III. RbF

IV. KF

(1) I, II, III & IV

(2) II only

(3) I only

(4) I & II only

Gypsum on heating can change to :

1. Orthorhombic form.

2. Plaster of paris.

3. Dead plaster.

4. All of the above.

Crude sodium chloride obtained by crystallization of brine solution does not contain-

1. $MgS{O}_4$

2. $N{a}_{2}S{O}_4$

3. $MgC{l}_2$

4. $CaS{O}_4$

The fire extinguisher contains NaHCO₃ and the compound (X). The compound (X) maybe -

1. CH₃COOH

2. NaOH

3. C₆H₅OH

4. None of the above. 

All group-2 metals dissolve in liquid ammonia to produce a bright blue colour. The colour is due to-

1. A change in the structure of ammonia.

2. d-d transition.

3. The spectrum of the solvated electrons.

4. An electronic transition from a lower to a higher energy state.

A substance that gives a brick red flame and breaks down on heating giving oxygen and a brown gas is-

1. Calcium carbonate.

2. Magnesium carbonate.

3. Magnesium nitrate.

4. Calcium nitrate.

The bleaching action of bleaching powder is due to the formation of :

1. ${\mathrm{OCl}}^{-}$

2. ${\mathrm{O}}_2$

3. ${\mathrm{Cl}}_2$

4. ${\mathrm{Cl}}^{-}$

Alkali metals act as a : 

1. Good dehydrating agent.

2. Good reducing agent.

3. Good oxidising agent.

4. None of the above.