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Question (31)

QN0036002

Vegetable oil contains unsaturated carbon chains. During hydrogenation, what happens to these chains?

(A) Hydrogen is added and they become more saturated.
(B) Oxygen is removed and they become acids.
(C) Chlorine replaces hydrogen.
(D) Carbon atoms are removed.

Correct Answer: A

Explanation:

Hydrogenation adds hydrogen to unsaturated carbon chains, producing more saturated compounds. Nickel acts as the catalyst.

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Question (32)

QN0036003

Methane reacts with chlorine in sunlight according to the chapter. If one hydrogen atom is replaced by chlorine, which product is formed along with HCl?

(A) CH₂Cl₂
(B) CH₃Cl
(C) CCl₄
(D) CH₄Cl₂

Correct Answer: B

Explanation:

CH₄ + Cl₂ → CH₃Cl + HCl in sunlight. This is a substitution reaction.

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Question (33)

QN0036004

A reaction involves replacing one hydrogen atom of a saturated hydrocarbon by chlorine. Which feature identifies the reaction as substitution?

(A) Hydrogen is added to a double bond.
(B) One atom/group takes the place of another.
(C) Oxygen is added to alcohol.
(D) An ester reacts with alkali.

Correct Answer: B

Explanation:

In substitution reactions, one type of atom or group replaces another.

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Question (34)

QN0036005

Ethanol is heated at 443 K with excess concentrated sulphuric acid. Which product is expected?

(A) Ethane
(B) Ethene
(C) Ethanoic acid
(D) Methane

Correct Answer: B

Explanation:

Concentrated sulphuric acid removes water from ethanol at 443 K, producing ethene.

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Question (35)

QN0036006

In the dehydration of ethanol, one molecule of ethanol loses one molecule of water. If ethanol is C₂H₆O, what is the formula of the remaining hydrocarbon?

(A) C₂H₆
(B) C₂H₄
(C) C₂H₂
(D) CH₄

Correct Answer: B

Explanation:

C₂H₆O − H₂O = C₂H₄, which is ethene.

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Question (36)

QN0036007

A student needs to distinguish ethanol from ethanoic acid. Which observation would provide a suitable chemical distinction based on the chapter?

(A) Both react identically with sodium hydrogencarbonate.
(B) Ethanoic acid reacts with sodium hydrogencarbonate to release CO₂.
(C) Ethanol produces CO₂ with sodium hydrogencarbonate.
(D) Neither reacts with bases.

Correct Answer: B

Explanation:

Ethanoic acid reacts with carbonates and hydrogencarbonates to release carbon dioxide, whereas ethanol does not show this reaction.

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Question (37)

QN0036008

Ethanoic acid reacts with sodium hydroxide. If one molecule of each reacts, how many molecules of water are formed?

(A) 0
(B) 1
(C) 2
(D) 3

Correct Answer: B

Explanation:

CH₃COOH + NaOH → CH₃COONa + H₂O. One molecule of water is formed.

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Question (38)

QN0036009

Two molecules of ethanoic acid react completely with one molecule of sodium carbonate. How many molecules of sodium ethanoate are produced?

(A) 1
(B) 2
(C) 3
(D) 4

Correct Answer: B

Explanation:

2CH₃COOH + Na₂CO₃ → 2CH₃COONa + H₂O + CO₂. Thus two molecules of sodium ethanoate are formed.

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Question (39)

QN0036010

When ethanoic acid reacts with sodium hydrogencarbonate, which gas is released and how can it be identified?

(A) H₂; it burns with a pop sound.
(B) O₂; it relights a glowing splint.
(C) CO₂; it turns lime-water milky.
(D) Cl₂; it bleaches litmus.

Correct Answer: C

Explanation:

The reaction produces CO₂, which can be identified by passing it through freshly prepared lime-water.

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Question (40)

QN0036011

Pure ethanoic acid has a melting point of 290 K. Why can it become solid in sufficiently cold regions?

(A) Its melting point is above all possible temperatures.
(B) Its melting point is close to ordinary room-temperature conditions in cold climates.
(C) It is an ionic solid.
(D) It contains no carbon.

Correct Answer: B

Explanation:

Pure ethanoic acid freezes around 290 K, giving rise to the name “glacial acetic acid.”

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Question (31)

Vegetable oil contains unsaturated carbon chains. During hydrogenation, what happens to these chains?

Explanation:

Link:

Question (32)

Methane reacts with chlorine in sunlight according to the chapter. If one hydrogen atom is replaced by chlorine, which product is formed along with HCl?

Explanation:

Link:

Question (33)

A reaction involves replacing one hydrogen atom of a saturated hydrocarbon by chlorine. Which feature identifies the reaction as substitution?

Explanation:

Link:

Question (34)

Ethanol is heated at 443 K with excess concentrated sulphuric acid. Which product is expected?

Explanation:

Link:

Question (35)

In the dehydration of ethanol, one molecule of ethanol loses one molecule of water. If ethanol is C₂H₆O, what is the formula of the remaining hydrocarbon?

Explanation:

Link:

Question (36)

A student needs to distinguish ethanol from ethanoic acid. Which observation would provide a suitable chemical distinction based on the chapter?

Explanation:

Link:

Question (37)

Ethanoic acid reacts with sodium hydroxide. If one molecule of each reacts, how many molecules of water are formed?

Explanation:

Link:

Question (38)

Two molecules of ethanoic acid react completely with one molecule of sodium carbonate. How many molecules of sodium ethanoate are produced?

Explanation:

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Question (39)

When ethanoic acid reacts with sodium hydrogencarbonate, which gas is released and how can it be identified?

Explanation:

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Question (40)

Pure ethanoic acid has a melting point of 290 K. Why can it become solid in sufficiently cold regions?

Explanation:

Link:

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