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Hydrogen from Acids

In a reaction...

Question

In a reaction between a metal and an acid, why are bubbles formed?

A

Formation of $H_{2}$ gas

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B

Formation of $O_{2}$ gas

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C

Formation of metal salt

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D

None of the above

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Solution

The correct option is A
Formation of $H_{2}$ gas

Metals on reaction with acids liberate Hydrogen gas. This is the reason why bubbles are formed in the solution.

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Q. In a reaction between a metal and an acid, why are bubbles formed?

True or false?

(a) Oxides of metals are basic.

(b) Common salt is acidic.

(c) Salts corrode metals.

(d) Bases are formed by the neutralization reaction between acids and salts.

(e) Salts are neutral.

Q. Which of the following metal on reaction with hydrochloric acid does not form bubbles in the solution?

Q. The formation of calcium oxide from its elements is a reaction between
(a) two metals.
(b) two non-metals.
(c) a metal and a non-metal.
(d) an alkali and an acid.

Q. Indicate if the following statements are true or false.
(a) Oxides of non-metals dissolve in water to form some acids.
(b) Sulphites are salts formed from sulphuric acid.
(c) Phosphoric acid is tribasic.
(d) Nitric acid can only form normal salts.
(e) Hydrochloric acid can form both carbonates and bicarbonate.
(f) Carbonic acid can form both carbonates and bicarbonates.
(g) Water of crystallisation is found in anhydrous salts.
(h) Litmus turns red in the presence of alkalis.
(i) An acid reacts with a carbonate to form a salt, and hydrogen gas is obtained.
(j) Acid taste sweet.
(k) When the metal zinc reacts with hydrochloric acid, a salt called zinc chloride is formed.
(l) when metals react directly with acids, the reaction is called a displacement reaction.
(m) Sulphuric acid has the formula H₂SO₃.
(n) Carbon dioxide gas is given off as a result of displacement reactions between acids and metals.

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