EWT | Academic Question

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Question (31)
QN002761
Iron reacts with dilute hydrochloric acid to produce
  • (A) oxygen gas
  • (B) carbon dioxide gas
  • (C) hydrogen gas
  • (D) nitrogen gas

Correct Answer: C
Explanation:

Iron produces hydrogen gas with dilute hydrochloric acid.

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Question (32)
QN002762
The gas having rotten egg smell produced from iron sulfide and dilute hydrochloric acid is
  • (A) hydrogen sulfide
  • (B) oxygen
  • (C) nitrogen dioxide
  • (D) carbon monoxide

Correct Answer: A
Explanation:

Hydrogen sulfide has a rotten egg smell.

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Question (33)
QN002763
Which property changes when iron and sulfur form iron sulfide?
  • (A) Only colour
  • (B) Only texture
  • (C) Chemical properties
  • (D) Mass only

Correct Answer: C
Explanation:

A new compound has different chemical properties.

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Question (34)
QN002764
Sample B formed after heating iron and sulfur is classified as
  • (A) mixture
  • (B) compound
  • (C) element
  • (D) alloy

Correct Answer: B
Explanation:

Iron sulfide is a compound.

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Question (35)
QN002765
Which statement correctly explains why a magnet has no effect on iron sulfide?
  • (A) Sulfur destroys the magnet
  • (B) Iron particles disappear completely
  • (C) A new compound with different properties is formed
  • (D) Iron changes into oxygen

Correct Answer: C
Explanation:

Iron sulfide does not retain magnetic properties of iron.

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Question (36)
QN002766
Water extinguishes fire even though one of its constituent elements supports combustion. This shows that
  • (A) compounds have properties different from constituent elements
  • (B) all compounds support burning
  • (C) hydrogen stops combustion
  • (D) oxygen becomes inactive forever

Correct Answer: A
Explanation:

Compounds have properties different from their constituent elements.

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Question (37)
QN002767
Which of the following correctly matches the state of matter at room temperature?
  • (A) Oxygen – solid
  • (B) Bromine – liquid
  • (C) Mercury – gas
  • (D) Sulfur – liquid

Correct Answer: B
Explanation:

Bromine exists as liquid at room temperature.

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Question (38)
QN002768
Which substance below is formed by chemical combination of elements in fixed ratio?
  • (A) Air
  • (B) Bronze
  • (C) Water
  • (D) Soil

Correct Answer: C
Explanation:

Water is formed chemically in fixed ratio.

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Question (39)
QN002769
A student observes gas bubbles collecting in two test tubes during electrolysis of water. The larger volume of gas collected is most likely
  • (A) oxygen
  • (B) nitrogen
  • (C) carbon dioxide
  • (D) hydrogen

Correct Answer: D
Explanation:

Hydrogen is produced in greater volume due to 2:1 ratio in water.

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Question (40)
QN002770
Which of the following best explains why compounds are pure substances?
  • (A) Their components are visible separately
  • (B) Their composition is fixed
  • (C) They can be separated physically
  • (D) They always exist as solids

Correct Answer: B
Explanation:

Compounds have fixed composition throughout.

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