The atomic radius of sodium is larger than that of chlorine because: MCQ with Answer and Explanation

The atomic radius of sodium is larger than that of chlorine because:
A. Sodium has fewer electrons
B. Chlorine has greater nuclear charge attracting electrons more strongly
C. Sodium is a metal
D. Chlorine is a gas
Answer: Option B
Solution (By JKSSB Mock Tests)
Across period 3, nuclear charge increases (Na: 11+, Cl: 17+) while electrons are added to the same shell. The increased attraction pulls electrons closer, decreasing radius. Na has larger radius despite having fewer electrons.

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Practice More chemistry Questions

Question #1
Caustic soda is the common name for:
A. Sodium bicarbonate
B. Sodium carbonate
C. Potassium hydroxide
D. Sodium hydroxide

Correct Answer: Option D


Explanation:
Caustic soda is NaOH (sodium hydroxide). It is a strong base used in soap, paper, and textile industries. Washing soda is Na₂CO₃, baking soda NaHCO₃. Caustic potash is KOH.

This question belongs to: Science chemistry
Question #2
Which of the following is considered the cleanest fuel?
A. Wood
B. Coal
C. Diesel
D. Hydrogen

Correct Answer: Option D


Explanation:
Hydrogen is considered the cleanest fuel because its combustion produces only water (2H₂ + O₂ → 2H₂O) and no greenhouse gases or toxic pollutants. Coal, wood, and diesel produce CO₂, CO, SO₂, and particulate matter, contributing significantly to air pollution and global warming.

This question belongs to: Science chemistry
Question #3
Which of the following gases diffuses fastest under identical conditions?
A. Cl₂
B. N₂
C. O₂
D. NH₃

Correct Answer: Option D


Explanation:
Graham's law: rate ∝ 1/√M. Molar masses: O₂=32, N₂=28, NH₃=17, Cl₂=71. NH₃ has the smallest molar mass, so it diffuses fastest.

This question belongs to: Science chemistry