Everyday Science · Atoms, Elements & Compounds · page 12 of 13

Some Important Compounds MCQs with Answers

Includes 8 past paper MCQs (marked).

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Some Important Compounds MCQs (111–120)

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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111.
CaO is the chemical formula of?
Correct Answer: D. Calcium oxide
One-liner
CaO is the chemical formula of Calcium oxide, commonly known as quicklime.
112.
Among the following, is an electrolyte.
Correct Answer: C. Sodium hydroxide
One-liner
Among the given options, Sodium hydroxide is an electrolyte because it dissociates into ions in aqueous solution and conducts electricity.
113.
Which one of the following salts is commonly known as Epsom salt?
Correct Answer: B. Magnesium sulphate
One-liner
Epsom salt is the common name for Magnesium sulphate (MgSO₄).
114.
What is the molecular weight of ammonia (NH₃)?
Correct Answer: D. 17
One-liner
The molecular weight of ammonia (NH₃) is 17 amu (atomic mass units).
115.
Which of the following is the chemical formula of glycerol?
Correct Answer: D. C₃H₈O₃
One-liner
The chemical formula of glycerol is C₃H₈O₃.
116.
Which of the following is helpful for removal of permanent hardness?
Correct Answer: A. Na2CO3
One-liner
Na2CO3 (washing soda) is used to remove permanent hardness of water by precipitating calcium and magnesium ions as insoluble carbonates.
117.
The first organic compound prepared in the laboratory was?
Correct Answer: B. Urea
One-liner
The first organic compound prepared in the laboratory was urea, synthesized by Friedrich Wöhler in 1828.
118.
Which compound is very slightly soluble in water?
Correct Answer: B. AgCl
One-liner
AgCl (Silver chloride) is very slightly soluble in water because it is a sparingly soluble salt.
119.
All are basic hydroxides except one:
Correct Answer: C. Be(OH)₂
One-liner
Be(OH)₂ (beryllium hydroxide) is an amphoteric hydroxide, unlike the others which are basic hydroxides.
120.
Which of the following is heavier: Methane, Ethane, Propane, Butane?
Correct Answer: D. Butane
One-liner
Among methane, ethane, propane, and butane, Butane is the heaviest because it has the highest molecular weight (58 g/mol) with four carbon atoms.

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Some Important Compounds MCQs with Answers

Some Important Compounds MCQs (111–120)

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