How many of total metals that are given below can displace hydrogen from sulphuric acid?
Sodium, potassium, iron, gold, lead and silver.
4

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Solution

The correct option is A 4
The arrangement of the metals in the increasing or decreasing order of its reactivity is called the reactivity series of the metals. The reactivity series is shown below:

Here sodium, potassium, iron and lead are placed above hydrogen thus they can replace hydrogen from acids. Gold and silver are noble metals and do not react with acids.

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Similar questions

The figure represents the reactivity of metals then which of the following are correct?

(i) Sodium is more reactive than magnesium.

(ii) Magnesium ad aluminium metals displace lead.

(iii) Magnesium and aluminium metals displace calcium.

(iv) Iron and tin metals can displace magnesium.

(v) Most reactive metal is sodium.

(vi) Gold is least reactive.

(vii) Calcium and zinc metals displace iron.

Write the balanced chemical equations of the following reactions.

(a) Sodium hydroxide + sulphuric acid $\to$ sodium sulphate + water

(b) Potassium bicarbonate + sulphuric acid $\to$ potassium sulphate + carbon dioxide + water

(d) Chlorine + sulphur dioxide + water $\to$ sulphuric acid + hydrogen chloride

(e) Silver nitrate $\to$ silver + nitrogen dioxide + oxygen

(f) Copper + nitric acid $\to$ copper nitrate + nitric oxide + water

(g) Ammonia + oxygen $\to$ nitric oxide + water

(h) Barium chloride + sulphuric acid $\to$ barium sulphate + hydrochloric acid

(i) Zinc sulphide + oxygen $\to$ zinc oxide + sulphur dioxide

(j) Aluminium carbide + water $\to$ aluminium hydroxide + methane

(k) Iron pyrites ( $F e S_{2}$ ) + oxygen $\to$ ferric oxide + sulphur dioxide

(l) Potassium permanganate + hydrochloric acid $\to$ potassium chloride + manganese chloride + chlorine + water

(m) Aluminium sulphate + sodium hydroxide $\to$ sodium sulphate + sodium meta aluminate + water.

(n) Aluminium + sodium hydroxide + water $\to$ sodium meta aluminate + hydrogen

(o) Potassium dichromate + sulphuric acid $\to$ potassium chloride + chromium chloride + water + chlorine.

(p) Sulphur + nitric acid $\to$ sulphuric acid + nitrogen dioxide + water.

(q) Sodium chloride + manganese dioxide + sulphuric acid $\to$ sodium hydrogen sulphate + manganese sulphate + water + chlorine.

Give reason for the following :

(a) Though lead is above hydrogen in the activity series, it does not react with dilute hydrochloric acid or dilute sulphuric acid.

(b) Potassium and sodium are not used fro reaction with dilute hydrochloric acid or dilute sulphuric acid in laboratory preparation of hydrogen.

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