Question

(a) sulphuric acid (b) sulphurous acid (c) hydrochloric acid (d B. Fill in the blanks : 1. Very thin foils of are used to decorate sweets. 2. Metals get tarnished when exposed to air due to the formation of an 3. The arrangement of metals in a series, in the decreasing order of their reactivity is called is formed on dissolving phosphorus pentoxide in water. 4. METALS AND NON-METALS A-53​

Answer 1

Explanation:

Silver foil is used for decorating sweets called Vark.

On exposure to air, alkali metals get tarnished due to formation of oxides, hydroxides and carbonates on their surface.

Answer 2

Answer:

Dilute sulphuric acid reacts with zinc granules to produce zinc sulphate and hydrogen gas

H

2

SO

4

(aq)+Zn(s)→ZnSO

4

(aq)+H

2

(g)

(b) Dilute hydrochloric acid reacts with magnesium ribbon to produce magnesium chloride and hydrogen gas.

2HCl(aq)+Mg(s)→MgCl

2

(aq)+H

2

(g)

(c) Dilute sulphuric acid reacts with aluminium powder to produce aluminium sulphate and hydrogen gas.

3H

2

SO

4

(aq)+2Al(s)→Al

2

(SO

4

)

3

(aq)+3H

2

(g)

(d) Dilute hydrochloric acid reacts with iron filings to produce ferric chloride and hydrogen gas.

6HCl(aq)+Fe(s)→2FeCl

3

(aq)+3H

2

(g)