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. ${\mathrm{CaCO}}_3$

Dehydration of hydrates of halides of calcium, barium and strontium i.e., ${\mathrm{CaCl}}_2·6{\mathrm{H}}_2\mathrm{O}$, ${\mathrm{BaCl}}_2·2{\mathrm{H}}_2\mathrm{O}$, ${\mathrm{SrCl}}_2·2{\mathrm{H}}_2\mathrm{O}$, can be achieved by heating. 
These become wet on keeping in air. Which of the following statements is correct about these halides?

Metallic elements are described by their standard electrode potential, fusion enthalpy, atomic size, etc. The alkali metals are characterized by which of the following properties?

a. High boiling point

b. High negative standard electrode potential

c. High-density

d. Large atomic size

1. (a, b)
2. (b, c)
3. (c, d)
4. (b, d)

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)

Which of the following compounds are readily soluble in water?

a.  ${\mathrm{BeSO}}_4$

b.  ${\mathrm{MgSO}}_4$

c.  ${\mathrm{BaSO}}_4$

d.  ${\mathrm{SrSO}}_4$

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

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)

Identify the correct formula of halides of alkaline earth metals from the following.

1.  ${\mathrm{BaCl}}_2·2{\mathrm{H}}_2\mathrm{O}$

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

3.  ${\mathrm{CaCl}}_2·6{\mathrm{H}}_2\mathrm{O}$

4.  ${\mathrm{SrCl}}_2·4{\mathrm{H}}_2\mathrm{O}$

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

Choose the correct statements from the following.

1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)

Which of the following are the correct reasons for the anomalous behavior of lithium?

a.  Exceptionally small size of its atom

b.  Its high polarising power

c.  It has high degree of hydration

d.  Exceptionally low ionisation enthalpy

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