Everyday Science · Atoms, Elements & Compounds · page 6 of 20

Compounds MCQs with Answers

Includes 9 past paper MCQs (marked).

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Compounds MCQs (51–60)

10 MCQs with answers and a short one-liner. Hide answers to test yourself.

Past paper MCQs in this chapter · See all past papers

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51.
Which one of these is a heterocyclic compound?
Correct Answer: B. Pyridine
One-liner
Pyridine is a heterocyclic compound because its ring structure contains a nitrogen atom in place of one carbon atom.
52.
Which of the following is the most stable compound?
Correct Answer: A. Benzene
One-liner
Benzene is the most stable compound among the given options due to its resonance-stabilized aromatic ring structure.
53.
The compound with highest boiling point is:
Correct Answer: C. Acetic acid
One-liner
Among the given options, acetic acid has the highest boiling point due to strong intermolecular hydrogen bonding and dimer formation.
54.
A compound contains 40.0% carbon, 6.7% hydrogen and 53.3% of oxygen by mass. The relative molecular mass of the compound is between 55 and 65. What is the molecular formula of the compound?
Correct Answer: A. C₂H₄O₂
One-liner
The molecular formula of the compound is C₂H₄O₂ (acetic acid), with a molecular mass of 60 g/mol, which falls within the given range of 55–65.
55.
What is true about a peptide?
Correct Answer: D. It is a polyamide
One-liner
A peptide is a polyamide because it consists of amino acids linked by amide (peptide) bonds.
56.
0.078 g of a hydrocarbon occupies 22.414 ml of volume at STP. The empirical formula of the hydrocarbon is CH. The molecular formula of the hydrocarbon is?
Correct Answer: D. C₆H₆
One-liner
The molecular formula of the hydrocarbon is C₆H₆ (benzene), as the molar mass is 78 g/mol and the empirical formula mass of CH is 13 g/mol, giving n = 78/13 = 6.
57.
The basicity of H₃PO₄ (phosphoric acid) is _?
Correct Answer: C. 3
One-liner
The basicity of H₃PO₄ (phosphoric acid) is 3 because it has three replaceable hydrogen atoms per molecule.
58.
Bond present in diamond is _?
Correct Answer: C. Covalent bond
One-liner
The bond present in diamond is a covalent bond.
59.
Which of the following is an organo-metallic compound?
Correct Answer: A. Pb(C₆H₅)₂
One-liner
The organo-metallic compound among the given options is Pb(C₆H₅)₂ (lead diphenyl), which contains a direct metal–carbon bond.
60.
What is the molecular structure of XeF2?
Correct Answer: A. Linear
One-liner
The molecular structure of XeF₂ is linear.

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Compounds MCQs with Answers

Compounds MCQs (51–60)

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