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Standard X

Chemistry

Effect on Indicators by Acids and Bases

Sulphur dioxi...

Question

Sulphur dioxide gas gets evolved when HCl acid is added to:

Sodium thiosulphate

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Sodium sulphide

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Sodium hydroxide

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Zinc metal

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Solution

The correct option is A
Sodium thiosulphate

Sulphur dioxide gas gets evolved when HCl acid is added to sodium thiosulphate.

Na₂S₂O₃ + 2HCl → 2NaCl + H₂O + SO₂ + S

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Similar questions

Q. Choose the correct answer from the options given below:
(i) Hydroxide of this metal is soluble in sodium hydroxide solution.
(a) Magnesium
(b) Lead
(c) Silver
(d) Copper

(ii) When dilute sulphuric acid reacts with iron sulphide, the gas evolved is ________.
(a) Hydrogen sulphide
(b) Sulphur dioxide
(c) Sulphur trioxide
(d) Vapour of sulphuric acid.

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.

Q. In which of the following cases will a gas be given off?
(a) Hydrochloric acid is added to sodium carbonate
(b) Sulphuric acid is added to sodium hydroxide
(c) Sulphuric acid is added to copper oxide
(d) Hydrochloric acid is added to zinc oxide

Q. Given below are word equations. Convert them into chemical equations using symbols and valencies. Balance the equations. Use appropriate signs for gases and precipitates in the reaction.
i) Zinc Sulphide

+

Oxygen gas

\to

Zinc oxide solid

+

Sulphur dioxide gas
ii) Silver nitrate solution

+

Sodium chloride solution

\to

Silver chloride precipitate

+

Sodium nitrate solution
iii) Sulphur solid

+

Concentrated nitric acid

\to

Sulphuric acid

+

Nitrogen dioxide gas

+

Water
iv) Barium chloride Solution

+

Potassium sulphate Solution

\to

Barium sulphate Precipitate

+

Potassium chloride solution
v) Silver nitrate on heating

\to

silver metal

+

nitrogen dioxide gas

+

Oxygen gas.
vi) Aluminium hydroxide

+

Nitric acid

\to

Aluminium nitrate

+

Water.

Q. Give the name of the gas that evolved when sodium hydroxide reacts with zinc metal. Write the equation also.

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Sulphur dioxide gas gets evolved when HCl acid is added to:

The correct option is A Sodium thiosulphate Sulphur dioxide gas gets evolved when HCl acid is added to sodium thiosulphate. Na2S2O3 + 2HCl → 2NaCl + H2O + SO2 + S

The correct option is A
Sodium thiosulphate

Sulphur dioxide gas gets evolved when HCl acid is added to sodium thiosulphate.

Na₂S₂O₃ + 2HCl → 2NaCl + H₂O + SO₂ + S