Everyday Science · Atoms, Elements & Compounds · page 1 of 20

Compounds MCQs with Answers

Includes 9 past paper MCQs (marked).

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Compounds MCQs (1–10)

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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1.
Past Paper MCQ
What are oxides called that can behave as both acidic and basic oxides?
Correct Answer: D. Amphoteric oxides
One-liner
Oxides that can behave as both acidic and basic oxides are called amphoteric oxides.
2.
What is the oxidation state of chromium (Cr) in K2Cr2O7?
Correct Answer: D. +6
One-liner
The oxidation state of chromium (Cr) in K2Cr2O7 is +6.
3.
Triple bond is present in _?
Correct Answer: B. N₂
One-liner
A triple bond is present in N₂ (nitrogen gas), where two nitrogen atoms share three pairs of electrons.
4.
The structure of IF₇ is _.
Correct Answer: A. Pentagonal Bipyramidal
One-liner
The structure of IF₇ is Pentagonal Bipyramidal.
5.
The mass of 1 mole of water (H₂O) is equal to _?
Correct Answer: B. 18 g
One-liner
The mass of 1 mole of water (H₂O) is 18 g because the molecular mass of water is 18 g/mol (H = 1 × 2 + O = 16).
6.
The general formula for alkanes, (CnH₂n₊₂) + 2, stands for ?
Correct Answer: D. 2 hydrogen atoms
One-liner
The "+2" in the general alkane formula (CnH₂n₊₂) represents 2 hydrogen atoms beyond the 2n hydrogen atoms already accounted for.
7.
Which of the following is a compound?
Correct Answer: B. NaCl
One-liner
NaCl (sodium chloride) is a compound because it is formed by the chemical combination of two different elements, sodium and chlorine.
8.
Pyridine belongs to which class of organic compounds?
Correct Answer: D. Heterocyclic
One-liner
Pyridine belongs to the class of heterocyclic organic compounds.
9.
Which one of the following is not an isomorphous pair?
Correct Answer: C. Na₂CO₃, CaCO₃
One-liner
Na₂CO₃, CaCO₃ is not an isomorphous pair because isomorphous substances must have the same number of atoms arranged in a similar crystal lattice, which these two do not share.
10.
How many carbon atoms are present in one molecule of carbon dioxide (CO2)?
Correct Answer: A. 1
One-liner
One molecule of carbon dioxide (CO₂) contains 1 carbon atom.

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Compounds MCQs with Answers

Compounds MCQs (1–10)

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