Reaction of Acids with Metal Carbonates and Hydrogen Carbonates

Q.

Explain why Silver nitrate crystals are dissolved in distilled water and not in tap water to prepare silver nitrate solution as a laboratory reagent.

Q. Name the gas evolved when dilute hydrochloric acid reacts with sodium hydrogen carbonate. How is it recognised?
[2 Marks]

Q. A lab technician made a salt using a strong acid and a weak base. According to you what should be the nature of the salt formed?

1. Acidic and pH less than 7
2. Can't be determined
3. Basic and pH more than 7
4. Neutral and pH equal to 7

Q. Calcium carbonate reacts with hydrochloric acid to form calcium chloride and hydrogen gas.

1. False
2. True

Q. Identify X and Y in the reaction given below.

${\text{NaHCO}}_3\text{(s)}+\text{HCl}\text{(aq)}\to \text{NaCl}\text{(aq)}+\text{X}+\text{Y}$

1. X: ${\text{H}}_2\text{O}$, Y: $\text{CO}$
2. X: ${\text{H}}_2\text{O}$, Y: ${\text{CO}}_2$
3. X: ${\text{NO}}_2$, Y: $\text{CO}$
4. X: ${\text{N}}_2$, Y: ${\text{CO}}_2$

Q. The Taj Mahal, an immense mausoleum in Agra is made up of .

1. plaster of paris
2. silica
3. calcium carbonate
4. calcium hydroxide

Q. Hydrochloric acid reacts with crushed egg shells to give a gas that turns limewater milky. Identify the gas evolved.

1. Oxygen
2. Carbon monoxide
3. Hydrogen
4. Carbon dioxide

Q. Why does limewater turn milky when carbon dioxide gas is passed through it?

1. Due to the formation of calcium carbonate.
2. Due to the formation of calcium hydroxide.
3. Because hydrogen gas is released.
4. Because calcium hydroxide reacts with hydrogen gas.

Q.

Acid reacts with metal carbonate to give carbon dioxide as one of the products.

1. True
2. False

Q. Which of the following gas is released when an acid reacts with metal carbonate?

1. Hydrogen
2. Oxygen
3. Nitrogen
4. Carbon dioxide

Q. Limewater turns milky when _____ gas is passed through it.

1. carbon dioxide
2. oxygen
3. hydrogen
4. chlorine

Q. Lime water turnswhen CO2 is passed through it.

1. milky
2. red
3. blue