Which of the following is NOT a characteristic of an ideal gas? MCQ with Answer and Explanation

Which of the following is NOT a characteristic of an ideal gas?
A. Obeys PV = nRT at all conditions
B. Particles have no volume
C. No intermolecular forces
D. Particles have strong attractive forces
Answer: Option D
Solution (By JKSSB Mock Tests)
Ideal gas assumptions: particles have negligible volume, no intermolecular forces, and elastic collisions. Real gases deviate due to finite molecular size and attractions. At high pressure and low temperature, real gases deviate significantly; van der Waals equation corrects. So having strong attractive forces is not an ideal gas property. Ideal gas law PV = nRT is a limiting law.

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The valency of nitrogen in NO₂ is:
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B. 2
C. 5
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Correct Answer: Option A


Explanation:
In NO₂, each oxygen has valency 2; with two oxygens, total combining capacity = 4. Thus nitrogen's covalency is 4. The structure involves a coordinate bond. Oxidation state of N is +4. Valency is number of bonds formed: N forms two single bonds and one coordinate bond with O, total 4 bonds. In NO, valency is 2.

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Question #2
Cement sets into a hard mass when mixed with water due to:
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Correct Answer: Option D


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Cement undergoes hydration reactions: water reacts with cement compounds (C₃S, C₂S, C₃A) to form complex hydrated silicates and aluminates (e.g., C-S-H gel) along with Ca(OH)₂. This process causes setting and hardening, forming a rigid, rock-like mass. It is exothermic. Gypsum controls initial setting. Proper curing is necessary for strength development.

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Question #3
Atomic number of sodium is 11. Its electronic configuration is:
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Correct Answer: Option A


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