Preparation Using Zinc

Q. Zinc reacts with the concentrated solution of sodium hydroxide ___ gas is liberated.

Q.

Name the following

1. A metal below iron but above copper in the activity series of metals which has no reaction with water.

2. A metal which cannot be used for the preparation of hydrogen using dilute acids.

3. The salt formed when aluminium reacts with potassium Hydroxide, during the preparation of hydrogen from alkalis.

4. A gaseous reducing agent which is basic in nature

5. A compound formed between hydrogen and an element group 17[VIIA] - period 3.

Q. Choose the chemical equation for the reaction of Magnesium metal with Hydrochloric Acid.

1. $Mg\left(s\right)+2HCl\left(aq\right)-->MgC{l}_2\left(aq\right)+H_2\left(g\right)$
2. $Mg\left(s\right)+HCl\left(aq\right)-->MgC{l}_2\left(aq\right)+H\left(g\right)$
3. $Mg\left(s\right)+2HCl\left(aq\right)-->2MgCl\left(aq\right)+H_2\left(g\right)$
4. $Mg\left(s\right)+2HCl\left(aq\right)-->MgCl\left(aq\right)+H_2\left(g\right)$

Q. Question 5(a)
Write word equations and then balanced equations for the reaction taking place when:
(a) Dilute sulphuric acid reacts with zinc granules

Q. Zinc metal reacts with dilute hydrochloric acid to form zinc chloride and liberate hydrogen gas

Q.

Concentrated sulphuric acid on reaction with metal produces which of the following gas?

1. $H_{2}O$ (water vapour)

2. $H_2$ gas

3. $H_{2}S$ gas

4. $S{O}_2$ gas

Q. Zinc granules are used in laboratory preparation of hydrogen because it consists of _____ which acts as a catalyst and speeds up the rate of reaction.

1. calcium
2. copper
3. silver
4. iron

Q. In the preparation of hydrogen in laboratory using dilute hcl granulated zinc and not metallic zinc is used

Q. Zinc reacts with the concentrated solution of sodium hydroxide ___ gas is liberated.

Q.

Hydrogen can be prepared with the metal zinc by using :

(i) acid (ii) alkali (iii) water

Give an equation in each case.