Metal carbonates decompose on heating to give metal oxide and carbon
dioxide. Which of the metal carbonates is most stable thermally?

1. ${\mathrm{MgCO}}_3$

2. ${\mathrm{CaCO}}_3$

3. ${\mathrm{SrCO}}_3$

4. ${\mathrm{BaCO}}_3$

Some of the Group 2 metal halides are covalent and soluble in organic solvents.
Among the following metal halides, the one which is soluble in ethanol is

1. ${\mathrm{BeCl}}_2$

2. ${\mathrm{MgCl}}_2$

3. ${\mathrm{CaCl}}_2$

4. ${\mathrm{SrCl}}_2$

The order of decreasing ionisation enthalpy in alkali metals is

1. Na > Li > K > Rb

2. Rb < Na < K < Li

3. Li > Na > K > Rb

4. K < Li < Na < Rb

The solubility of metal halides depends on their nature, lattice enthalpy and
hydration enthalpy of the individual ions. Amongst fluorides of alkali metals,
the lowest solubility of LiF in water is due to

1. Ionic nature of lithium fluoride

2. High lattice enthalpy

3. High hydration enthalpy for lithium ion.

4. Low ionisation enthalpy of lithium atom

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)