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

The correct statement among the following regarding CsBr₃ is -

1. It is a covalent compound.

2. It contains Cs²⁺ and Br^- ions.

3. It contains Cs⁺, Br^- and Br₂ lattice molecules.

4. It contains Cs⁺ and ${\mathrm{Br}}_3^{-}$ ions.

Hypo is chemically:

1. Na₂S₂O₃.2H₂O

2. Na₂S₂O₃.3H₂O

3. Na₂S₂O₃.4H₂O

4. Na₂S₂O₃.5H₂O

If NaOH is added to an aqueous solution of Zn²⁺ ions, a white precipitate appears and on adding axcess NaOH, the precepitate dissolves. In this solution zinc exists in the:

1. cationic part

2. anionic part

3. both in cationic and anionic parts

4. there is no zinc left in the solution

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