Chemistry 9th Chap 10 : Topic 6 - Maryam Publications

Chemistry Chapter 10 : Topic 6

Reactions of Acids

1 / 24

Which statement best explains why acids react with metals such as zinc or magnesium?

A) Acids provide hydrogen ions (H⁺) which replace metal ions to form salt and hydrogen gas.

B) Acids donate electrons to metals during reaction.

C) Acids supply oxygen which helps metals form oxides.

D) Acids dissolve metals physically without any chemical change.

2 / 24

Which gas is always produced when a dilute acid reacts with a reactive metal?

A) Carbon dioxide

B) Oxygen

C) Nitrogen

D) Hydrogen

3 / 24

What is the general product of the reaction between an acid and a metal?

A) Carbonate and water

B) Salt and hydrogen gas

C) Salt and water

D) Base and oxygen

4 / 24

Why do copper and silver show no reaction with dilute hydrochloric acid?

A) They form insoluble salts.

B) They are alkaline metals.

C) They are non-metals.

D) They are less reactive than hydrogen.

5 / 24

Which observation confirms that a metal-acid reaction is occurring?

A) Formation of a white precipitate only

B) Evolution of hydrogen gas bubbles

C) Increase in temperature only

D) Formation of carbon dioxide gas

6 / 24

Which statement best describes acid-base neutralization?

A) Acid reacts with metal to form hydrogen.

B) Acid reacts with metal oxide to form hydrogen.

C) Acid reacts with base to form salt and water.

D) Acid reacts with carbonate to form oxygen.

7 / 24

What happens when hydrochloric acid reacts with sodium hydroxide?

A) Salt and water are formed.

B) Hydrogen gas is produced.

C) Oxygen gas is released.

D) Carbon dioxide is produced.

8 / 24

Which ion is responsible for the acidic behavior in neutralization reactions?

A) Cl⁻

B) OH⁻

C) H⁺

D) Na⁺

9 / 24

Which of the following best explains why acids react with bases?

A) Both release oxygen gas

B) Bases supply hydrogen ions

C) They neutralize each other forming salt and water

D) Both produce hydrogen gas

10 / 24

What is observed when acid reacts with a carbonate?

A) Only salt is formed.

B) Carbon dioxide gas is produced.

C) Hydrogen gas is produced.

D) Oxygen gas is produced.

11 / 24

Which test confirms the presence of carbon dioxide produced during acid-carbonate reaction?

A) Blue litmus test

B) Glowing splint test

C) Lime water test turning milky

D) Burning splint explosion

12 / 24

Why do acids react with carbonates but not always with all salts?

A) Carbonates are non-reactive metals.

B) Carbonates release CO₂ when reacting with H⁺ ions.

C) Salts always neutralize acids.

D) Carbonates contain hydrogen.

13 / 24

Which equation correctly represents acid-carbonate reaction?

A) Acid + Carbonate → Salt + Water + CO₂

B) Acid + Oxygen → Salt

C) Acid + Base → Salt + Water

D) Acid + Metal → Salt + Hydrogen

14 / 24

Which of the following best describes a neutralization reaction?

A) Acid reacting with base producing salt and water

B) Acid reacting with metal producing gas

C) Metal reacting with oxygen

D) Acid reacting with carbonate producing CO₂

15 / 24

Why is hydrogen gas not produced when acids react with bases?

A) Bases destroy hydrogen atoms.

B) Hydrogen ions are neutralized to form water.

C) Bases convert acids into oxygen.

D) Metals are required for hydrogen formation.

16 / 24

Which substance will produce fizzing when treated with dilute acid?

A) Sodium hydroxide

B) Sodium chloride

C) Calcium carbonate

D) Copper oxide

17 / 24

Which statement about acid-metal reactions is correct?

A) All metals react equally with acids.

B) Acids only react with noble metals.

C) Only non-metals react with acids.

D) More reactive metals react faster with acids.

18 / 24

What is the role of hydrogen ions in acid reactions?

A) They destroy bases.

B) They form carbonates.

C) They form oxygen gas.

D) They replace metal ions to form salts.

19 / 24

Which gas is NOT produced in any acid reaction?

A) Oxygen

B) Hydrogen

C) Both hydrogen and carbon dioxide

D) Carbon dioxide

20 / 24

Which pair shows correct classification of acid reactions?

A) Acid+Carbonate → CO₂

B) Acid+Metal → CO₂

C) Acid+Metal → Water

D) Acid+Base → Hydrogen

21 / 24

Which observation indicates complete neutralization?

A) Formation of hydrogen gas

B) No change in temperature

C) Formation of only salt and water

D) Continued gas evolution

22 / 24

Which acid property is correctly matched with its reaction?

A) Acid + Oxygen → Salt

B) Acid + Base → Salt + Water

C) Acid + Metal → CO₂

D) Acid + Carbonate → Hydrogen

23 / 24

Why do acids react differently with metals, bases, and carbonates?

A) Because acids change structure.

B) Because all contain hydrogen.

C) Because of different ions involved (H⁺, OH⁻, CO₃²⁻).

D) Because temperature changes only.

24 / 24

Which combination correctly shows all acid reaction products?

A) Metal → salt + hydrogen

B) Carbonate → salt + water + CO₂

C) All of the above

D) Base → salt + water

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