Calcium Carbonate

Q. _____ acid is used in the laboratory preparation of calcium carbonate.

1. Carbonic
2. Nitric
3. Sulphuric
4. Hydrochloric

Q. Egg shells and conch are natural sources of calcium carbonate.

1. True
2. False

Q. A is a gas which on dissolving in water forms an acid B. This acid on reaction with calcium hydroxide gives C and water. Identify A, B and C.

1. A- Carbon dioxide, B- Carbonic acid, C- Calcium carbonate
2. A- Carbon monoxide, B- Carbonic acid, C- Calcium oxide
3. A- Oxygen, B- Sodium sulphate, C- Sodium carbonate
4. A- Carbon dioxide, B- Carbonic acid, C- Calcium chloride

Q. The lime water turns milky when X gas is passed through it. This milkiness is caused due to the formation of Y. Identify X and Y from the options given below.

1. X- $\text{CO}$, Y- ${\text{CaCO}}_3$
2. X- ${\text{CO}}_2$, Y- ${\text{Ca(OH)}}_2$
3. X- ${\text{CO}}_2$, Y- ${\text{CaCO}}_3$
4. X- ${\text{O}}_2$, Y- ${\text{Na}}_2{\text{CO}}_3$

Q.

When a gas X is passed through limewater, it turns milky due to the formation of a precipitate Y. Identify X and Y.

1. $H_2$ and $Ca(HC{O}_3{)}_2$
2. $C{O}_2$ and $CaC{O}_3$
3. $C{l}_2$ and $CaC{l}_2$
4. $C{O}_2$ and $Ca(HC{O}_3{)}_2$

Q.

Which combination is best explained by co-ordinate covalent bond?

1. $Mg+Y_2{O}_2$

2. Cl + Cl

3. $H^{+}+H_{2}O$
4. $H_2+I_2$

Q. In potassium ferro-cyanide, the nature of bond between iron and cyanide ions is

1. Dative Bond
2. Ionic Bond
3. Polar Bond
   
4. Covalent Bond

Q. The coordinate covalent bond differs from covalent bond in:

1. The overlapping of orbitals
2. The covalent nature
3. The donation or sharing in electrons
4. All of the above

Q.

Which of the following contains a coordinate covalent bond

1. $H_{2}O$

2. $N_2{O}_5$

3. $BaC{l}_2$

4. $HCl$

Q.

Which combination is best explained by the co-ordinate covalent bond

1. Cl+Cl

2. $H_2+I_2$

3. $H^{+}+H_{2}O$

4. $Mg+\frac{1}{2}{O}_2$