The rate of effusion of gas A is 4 times that of gas B. If molar mass of B is 64 g/mol, molar mass of A is: MCQ with Answer and Explanation

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The rate of effusion of gas A is 4 times that of gas B. If molar mass of B is 64 g/mol, molar mass of A is:

A. 4 g/mol

B. 16 g/mol

C. 128 g/mol

D. 256 g/mol

Answer: Option A

Solution (By JKSSB Mock Tests)

Graham's law: r_A / r_B = √(M_B / M_A). 4 = √(64 / M_A) → square both sides: 16 = 64 / M_A → M_A = 64/16 = 4 g/mol (Helium).

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LPG is domesticated with a strong-smelling compound to detect leaks. This compound is:

A. Ethanol

B. Methanol

C. Thioethanol

D. Chloroform

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Correct Answer: Option C

Explanation:
LPG (Liquefied Petroleum Gas) is naturally odorless. To detect dangerous leaks, a strong-smelling sulfur compound called ethyl mercaptan (thioethanol, C2H5SH) is added to it. Its pungent, rotting-cabbage-like smell is easily detectable by the human nose even at very low concentrations.

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Question #2

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The valency of iron in Fe₂O₃ is:

A. 1

B. 3

C. 2

D. 4

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Correct Answer: Option B

Explanation:
In Fe₂O₃, oxygen has valency 2. Two Fe atoms combined with three O atoms: total negative charge = 6. For two Fe, total positive = 6, so each Fe has +3. Valency = 3 (ferric). In FeO, valency is 2 (ferrous).

This question belongs to: Science chemistry