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Standard VIII
Chemistry
Thermochemical Reactions
Which of thes...
Question

Which of these chemical reactions produce a gas?


A

Zinc reacting with dilute sulphuric acid

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B

Iron dropped into copper sulphate solution

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C

Silver nitrate is added to a sodium chloride solution

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D

Ammonia gas reacting with hydrochloric acid

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Solution

The correct option is A

Zinc reacting with dilute sulphuric acid


When zinc reacts with dilute sulphuric acid, hydrogen gas is evolved with an effervescence.

Zn+H2SO4→ZnSO4+H2


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Q. Write balanced chemical equations for each of the following reactions
1. Carbon dioxide Marble dissolves in hydrochloric acid to give calcium chloride water and carbon dioxide
2. Silver nitrate reacts with copper to produce copper nitrate and silver metal
3. Carbon dioxide gas is passed over lime water to form a precipitate of calcium carbonate
4. Aluminium Sulphate acts with Sodium Hydroxide to form precipitate of aluminium hydroxide and the solution of sodium sulphate
5. Barium Chloride solution reacts with sulphuric acid to form precipitate of Barium sulphate and solution of hydrochloric acid.
Q. Balance the chemical equation by including the physical states of the substances for the following reactions.

a) Barium chloride and sodium sulphate aqueous solutions react to give insoluble Barium sulphate and an aqueous solution of sodium chloride.

b) Sodium hydroxide reacts with hydrochloric acid to produce sodium chloride and water.

c) Zinc pieces react with dilute hydrochloric acid to liberate hydrogen gas and forms zinc chloride
Q. State your observations when:
(i) Dilute hydrochloric acid is added to lead nitrate solution and the mixture is heated.
(ii) Barium chloride solution is mixed with sodium sulphate solution.
(iii) Concentrated sulphuric acid is added to sugar crystals.
(iv) Dilute hydrochloric acid is added to copper carbonate.
(v) Dilute hydrochloric acid is added to sodium thiosulphate.
Q.

What do you observe when

(a) dilute sulphuric acid is added to granulated zinc ?

(b) a few pieces of iron are dropped in a blute solution of sodium chloride ?

(c) silver nitrate is added to a solution to a of sodium chloride ?

(d) ferrous sulphate solution is added to an aqueous solution of sodium hydroxide.

(e) solid lead nitrate is heated ?

(f) when dilute sulphuric acid is added to barium chloride solution ?

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 → Zinc oxide solid + Sulphur dioxide gas
ii) Silver nitrate solution + Sodium chloride solution → Silver chloride precipitate + Sodium nitrate solution
iii) Sulphur solid + Concentrated nitric acid → Sulphuric acid + Nitrogen dioxide gas + Water
iv) Barium chloride Solution + Potassium sulphate Solution → Barium sulphate Precipitate + Potassium chloride solution
v) Silver nitrate on heating→ silver metal + nitrogen dioxide gas + Oxygen gas.
vi) Aluminium hydroxide + Nitric acid → Aluminium nitrate + Water.
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