When zeolite, which is hydrated sodium aluminium silicate is treated with hard water, the sodium ions are exchanged with which of the following ion(s)?

a.  ${\mathrm{H}}^{+}$ ions

b.  ${\mathrm{Mg}}^{2+}$ ions

c.  ${\mathrm{Ca}}^{2+}$ ions

d.  ${\mathrm{SO}}_4^{2-}$ ions

Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)

Match the elements given in Column I with the properties mentioned in Column II.

Codes

When sodium is dissolved in liquid ammonia, a solution of deep blue color is obtained. The color of the solution is due to

1. Ammoniated electron

2. Sodium ion

3. Sodium amide

4. Ammoniated sodium ion

Dead burnt plaster is-

1. ${\mathrm{CaSO}}_4$

2. ${\mathrm{CaSO}}_4·\frac{1}{2}{\mathrm{H}}_2\mathrm{O}$

3. ${\mathrm{CaSO}}_4·{\mathrm{H}}_2\mathrm{O}$

4. ${\mathrm{CaSO}}_4·2{\mathrm{H}}_2\mathrm{O}$

Suspension of slaked lime in water is known as

1. Lime water

2. Quick lime

3. Milk of lime

4. Aqueous solution of slaked lime

The formula of soda ash is

1.  ${\mathrm{Na}}_2{\mathrm{CO}}_3·10{\mathrm{H}}_2\mathrm{O}$

2.  ${\mathrm{Na}}_2{\mathrm{CO}}_3·2{\mathrm{H}}_2\mathrm{O}$

3.  ${\mathrm{Na}}_2{\mathrm{CO}}_3·{\mathrm{H}}_2\mathrm{O}$

4.  ${\mathrm{Na}}_2{\mathrm{CO}}_3$

A substance which gives brick red flame and breaks down on heating to give oxygen and a brown gas is

1. Magnesium nitrate

2. Calcium nitrate

3. Barium nitrate

4. Strontium nitrate

Which of the following statements is true about $\mathrm{Ca}{\left(\mathrm{OH}\right)}_2$?

1. It is used in the preparation of bleaching powder

2. It is a light blue solid

3. It does not possess a disinfectant property

4. It is used in the manufacture of cement

Chemical A is used for the preparation of washing soda to recover ammonia. When CO₂ is bubbled through an aqueous solution of A, the solution turns milky. It is used in whitewashing due to its disinfectant nature. The chemical formula of A is-

1. $\mathrm{Ca}{\left({\mathrm{HCO}}_3\right)}_2$

2. $\mathrm{CaO}$

3. $\mathrm{Ca}{\left(\mathrm{OH}\right)}_2$

4. ${\mathrm{CaCO}}_3$

Several sodium compounds find use in industries. Which of the following compounds are used in the textile industry?

a. ${\mathrm{Na}}_2{\mathrm{CO}}_3$

b. ${\mathrm{NaHCO}}_3$

c. $\mathrm{NaOH}$

d. $\mathrm{NaCl}$

Choose the correct option
1. (a, c)
2. (b, c)
3. (c, d)
4. (a, d)