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

1. ${\mathrm{CaCl}}_2$

2. NaCl

3. NaOH

4. ${\mathrm{NaHCO}}_3$

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.

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

A chemical A is used for the preparation of washing soda to recover ammonia. When ${\mathrm{CO}}_2$ is bubbled through an aqueous solution of A, the solution turns milky. It is used in white washing due to disinfectant nature. What is the chemical formula of A?

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

2. CaO

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

4. ${\mathrm{CaCO}}_3$

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

  Column I                   Column II

1. Li                        (a) Insoluble sulphate

2. Na                      (b) Strongest monoacidic base

3. Ca                      (c) Most negative ${\mathrm{E}}^{\oplus }$ value among alkali metals.

4. Ba                      (d) Insoluble oxalate

                              (e) $6{\mathrm{s}}^2$ outer electronic configuration

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

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

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

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

Match the elements given in Column I with the colour they impart to the
flame given in Column II.

  Column I                     Column II

1. Cs                         (a) Apple green

2. Na                         (b) Violet

3. K                           (c) Brick red

4. Ca                         (d) Yellow

5. Sr                         (e) Crimson red

6. Ba                         (f) Blue

1. (1)→ (f),(2) → (d),(3) → (b),(4) → (c),(5)→ (e),(6) → (a)

2. (1)→ (a),(2) → (d),(3) → (c),(4) → (b),(5)→ (f),(6) → (e)

3. (1)→ (b),(2) → (a),(3) → (d),(4) → (e),(5)→ (c),(6) → (f)

4. (1)→ (d),(2) → (c),(3) → (e),(4) → (a),(5)→ (f),(6) → (b)

Which nitrate cannot give light brown gas on heating?

Na₂CO₃ can be manufactured by Solvay’s process but K₂CO₃ cannot be, because

1. K₂CO₃ is more soluble

2. K₂CO₃ is less soluble 

3. KHCO₃ is more soluble than NaHCO₃

4. KHCO₃ is less soluble than NaHCO₃

Which of the following metal bicarbonates does not exist as solid?

1. LiHCO₃

2. KHCO₃

3. RbHCO₃

4. NaHCO₃