Which bond has the highest ionic character? MCQ with Answer and Explanation

Question
Which bond has the highest ionic character?
A. HBr
B. HF
C. HI
D. HCl
Answer: Option B
Solution (By JKExamLibrary)
Ionic character increases with the difference in electronegativity between bonding atoms. In hydrogen halides, electronegativity decreases from F to I (F: 4.0, Cl: 3.0, Br: 2.8, I: 2.5). Thus HF has the largest electronegativity difference (1.9) and highest ionic character. The trend: HF > HCl > HBr > HI. However, HF is still a covalent polar molecule. Exam tip: Electronegativity difference > 1.7 usually indicates ionic bond.
This question belongs to: Science chemistry
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Question #1
Which of the following is a naturally occurring radioactive element?
A. Aluminum
B. Calcium
C. Iron
D. Uranium
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Correct Answer: Option D

Explanation:
Uranium (U) is a naturally occurring heavy metal that is radioactive. Its most common isotopes are U-238 and U-235. Aluminum, iron, and calcium are stable, non-radioactive elements under normal conditions, though they may have synthetic radioactive isotopes.
This question belongs to: Science chemistry
Question #2
Assertion (A): A catalyst does not change the equilibrium yield of a reaction. Reason (R): A catalyst speeds up both the forward and backward reactions equally.
A. A is true but R is false.
B. A is false but R is true.
C. Both A and R are true and R is the correct explanation of A.
D. Both A and R are true but R is NOT the correct explanation of A.
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Correct Answer: Option C

Explanation:
A catalyst lowers the activation energy for both the forward and reverse reactions by the same amount. Therefore, it increases the rates of both reactions equally, allowing the system to reach equilibrium faster, but without changing the final equilibrium concentrations (yield). Both statements are correct and R explains A.
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Question #3
Which of the following is a primary air pollutant?
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D. Sulphuric acid
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Correct Answer: Option C

Explanation:
Primary air pollutants are emitted directly from a source. Carbon monoxide (CO), sulfur dioxide (SO₂), and nitrogen oxides (NOx) are primary pollutants. Ozone, PAN, and sulfuric acid are secondary pollutants, formed in the atmosphere by reactions of primary pollutants.
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