Which one of the following is a gaseous compound (at room temperature and pressure) that exists as linear molecules and reacts with water to form an acidic solution?
A) Silicon dioxide
B) Carbon dioxide
C) Sulfur dioxide
D) Nitrogen dioxide
E) Sulfur trioxide
IMAT 2023 · Question 38
Q38 - Compounds and elements
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The correct answer is B) Carbon dioxide.
You need all three: a gas, linear, and acidic in water. CO₂ (O=C=O) is the only one that fits. It dissolves to give carbonic acid.
SO₂ and NO₂ are acidic gases, but they are bent, not linear. SO₃ is trigonal planar and not a gas at room temperature. SiO₂ is a solid.
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