1099+ Important Chemistry MCQ Questions Answers

Q:

Choose the pure substance from the list below.

A) Sugar	B) Lemonade
C) Air	D) Sea water

Answer & Explanation Answer: A) Sugar

Explanation:

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Q:

The purest form of iron is

A) wrought iron	B) steel
C) pig iron	D) nickel steel

Answer & Explanation Answer: A) wrought iron

Explanation:

Wrought Iron is the purest form of iron. It contains 0.12 to 0.25% carbon and so it is the purest form of iron.

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Q:

Give the common name for the following compound

${({CH}_{3})}_{2} CH {CH}_{2} - Br$

A) Isobutyl bromide	B) Methyl bromide
C) Propyl bromide	D) Butyl bromide

Answer & Explanation Answer: A) Isobutyl bromide

Explanation:

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Q:

What is the IUPAC name for the following compound?

$H_{3} C - C \equiv C - H$

A) Acetylene	B) Methyl acetylene
C) Butanol	D) Decanoic Acid

Answer & Explanation Answer: B) Methyl acetylene

Explanation:

The IUPAC name of the compound is Methyl Acetylene or Propyne.

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Q:

Methane contributes towards global warming so it is called a _________________ gas.

A) poisonous	B) carcinogenic
C) infectious	D) greenhouse

Answer & Explanation Answer: D) greenhouse

Explanation:

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Q:

Which of the following is NOT a compound?

A) Ammonia	B) Milk
C) Sodiumchloride	D) Chalk

Answer & Explanation Answer: B) Milk

Explanation:

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Q:

Consider the following chemical reaction :

${aFe}_{2} O_{3} (s) + bCO (g) + cFe (s) + {dCO}_{2}$

In the balanced chemical equation of the above, which of the following will be the values of the coefficients a, b, c and d respectively?

A) 3, 2, 3, 1	B) 1, 3, 2, 3
C) 2, 3, 3, 1	D) 3, 3, 2, 1

Answer & Explanation Answer: B) 1, 3, 2, 3

Explanation:

Fe2O3 + 3CO = 2Fe + 3CO2

Hematite + Carbon Monoxide = Iron + Carbon Dioxide

In this reaction, the iron oxide is reduced to iron, and the carbon is oxidised to carbon dioxide.

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Q:

Which among the following noble gas has highest molar mass?

A) Kr	B) Ne
C) Ar	D) Xe

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