Which of the following statements are NOT correct?A. Hydrogen is used to reduce heavy metal oxides to metals.B. Heavy water is used to study reaction mechanism.C. Hydrogen is used to make saturated fats from oils.D. The H-H bond dissociation enthalpy…

Which of the following statements are NOT correct?

A. Hydrogen is used to reduce heavy metal oxides to metals.

B. Heavy water is used to study reaction mechanism.

C. Hydrogen is used to make saturated fats from oils.

D. The H-H bond dissociation enthalpy is lowest as compared to a single bond between two atoms of any element.

E. Hydrogen reduces oxides of metals that are more active than iron.

Choose the most appropriate answer from the options given below :

1. A, B, C only

2. B, C, D, E only

3. B, D only

4. D, E only

Doubtly Asked 30 Oct 2026 NEET UG 2023 neet Save WhatsApp Report

1 answer

Best answer

Answer: 4. D, E only

Key idea: Check each statement.

A. True: \(\mathrm{H_2}\) reduces oxides of less active (heavy) metals.
B. True: \(\mathrm{D_2O}\) is used as a tracer for reaction mechanisms.
C. True: hydrogenation of oils gives saturated fats.
D. False. H-H bond enthalpy (435.9 kJ/mol) is the highest among single bonds between two atoms of any element.
E. False. \(\mathrm{H_2}\) cannot reduce oxides of metals more active than iron.

Not correct: D and E. Option 4.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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