Amphoteric hydroxides react with both alkalies with acids. Which of the following Group 2 metal hydroxides is soluble in sodium hydroxide?

1. $\mathrm{Be}{\left(\mathrm{OH}\right)}_2$

2. $\mathrm{Mg}{\left(\mathrm{OH}\right)}_2$

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

4. $\mathrm{Ba}{\left(\mathrm{OH}\right)}_2$

In the synthesis of sodium carbonate, the recovery of ammonia is done by treating ${\mathrm{NH}}_4\mathrm{Cl}$ with $\mathrm{Ca}{\left(\mathrm{OH}\right)}_2$. The by-product obtained in this process is

1. ${\mathrm{CaCl}}_2$

2. $\mathrm{NaCl}$

3. $\mathrm{NaOH}$

4. ${\mathrm{NaHCO}}_3$

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

By adding gypsum to cement

1. Setting time of cement becomes less

2. Setting time of cement increases

3. Colour of cement becomes light

4. Shining surface is obtained

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

Which of the following elements does not form hydride by direct heating with dihydrogen?

1. Be

2. Mg

3. Sr

4. Ba

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