Which of the following has the largest atomic radius? MCQ with Answer and Explanation

Which of the following has the largest atomic radius?
A. I
B. Br
C. F
D. Cl
Answer: Option A
Solution (By JKSSB Mock Tests)
Atomic radius increases down a group as the number of shells increases. Iodine (I) is in Period 5, below F (2), Cl (3), Br (4). Thus iodine has the largest atomic radius among these halogens.

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Practice More chemistry Questions

Question #1
The process of destructive distillation of coal yields:
A. Graphite
B. Only methane
C. Petrol and diesel
D. Coke, coal tar, and coal gas

Correct Answer: Option D


Explanation:
Heating coal in the absence of air (destructive distillation) produces coke (solid residue, high carbon), coal tar (mixture of aromatic compounds), ammoniacal liquor, and coal gas (H₂, CH₄, CO). Coke is used in blast furnace. Coal tar is a source of aromatic chemicals and pitch. Coal gas was used for lighting historically.

This question belongs to: Science chemistry
Question #2
A catalyst that slows down a reaction is known as:
A. Activator
B. Promoter
C. Autocatalyst
D. Inhibitor

Correct Answer: Option D


Explanation:
Inhibitors (negative catalysts) decrease reaction rate. Promoters enhance activity of a catalyst; activators increase effectiveness; autocatalysts are reaction products that catalyze the reaction.

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Question #3
The oil drop experiment to determine the charge of an electron was performed by:
A. Robert Millikan
B. James Chadwick
C. Ernest Rutherford
D. J.J. Thomson

Correct Answer: Option A


Explanation:
Robert Millikan performed the oil drop experiment in 1909. By observing charged oil droplets in an electric field, he accurately determined the elementary charge of an electron (e = 1.6 × 10⁻¹⁹ C). This, combined with Thomson's e/m ratio, allowed calculating the electron's mass.

This question belongs to: Science chemistry