With reference to oxidation & reduction reactions - complete the statement given by filling in the blanks with only the words

(a) Addition

(b) Removal.

'Oxidation is a chemical reaction involving …………… of oxygen to a substance or …………… of hydrogen from a substance. Reduction on the other hand involves …………… of hydrogen to a substance or …………… of oxygen from a substance.

With reference to the equation:

Cl₂ + H₂S ⟶ 2HCl + S

pertaining to a redox reaction - select the correct answer in each case -

(a) Chlorine is oxidised/reduced to HCl.

(b) Hydrogen sulphide is oxidised/reduced to sulphur since the reaction involves addition/removal of hydrogen.

(c) Chlorine acts as an oxidising/reducing agent.

Give reasons for the following:

1. Copper does not displace hydrogen from dilute hydrochloric acid, but zinc does.

2. In the preparation of hydrogen by electrolysis of water - the distilled water used is acidified.

3. In the laboratory preparation of hydrogen from zinc and dilute hydrochloric acid the zinc used is granulated zinc.

4. In Bosch process - the final gaseous products are passed through caustic potash [KOH] soln.

5. The reaction of chlorine with hydrogen sulphide is deemed a redox reaction.

Select the correct answer from A, B, C, D or E for each statement given below:

A: Nickel

B: Sodium

C: Iron

D: Iron [III] oxide

E: Magnesium oxide

1. A metal which reacts with water to give a metallic hydroxide & liberate hydrogen.

2. The metallic compound used as a catalyst in Bosch process.

3. The metal used as a catalyst in hydrogenation of oils.

4. The metal which reacts with steam liberating hydrogen & the reaction is reversible.

5. The metallic compound formed when a metal above aluminium in the activity series reacts with steam.