The compound CH₄ is named: MCQ with Answer and Explanation

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The compound CH₄ is named:

A. Ethane

B. Propane

C. Methanol

D. Methane

Answer: Option D

Solution (By JKSSB Mock Tests)

One carbon atom with four hydrogens is methane (CH₄). Ethane is C₂H₆, propane C₃H₈. Methanol is CH₃OH (alcohol). Methane is the simplest alkane.

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Question #1

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Which of the following plastics is used for making non-stick cookware?

A. Nylon

B. PVC

C. Teflon

D. Polystyrene

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Correct Answer: Option C

Explanation:
Teflon (PTFE) has low friction and high heat stability, ideal for non-stick coatings. PVC for pipes; polystyrene for packaging; nylon for fibers.

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Question #2

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Which of the following alloys contains lead?

A. Solder

B. Brass

C. Duralumin

D. Bronze

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Correct Answer: Option A

Explanation:
Solder is an alloy primarily used for welding electrical components and pipes. It is traditionally composed of lead (Pb) and tin (Sn), typically in a 60:40 or 50:50 ratio. Brass is copper and zinc, bronze is copper and tin, and duralumin is an alloy of aluminum, copper, magnesium, and manganese.

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Question #3

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The process of passing water through a bed of zeolite removes:

A. Dissolved gases

B. Bacteria

C. Suspended impurities

D. Hardness

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Correct Answer: Option D

Explanation:
The zeolite (permutit) process is used to remove water hardness. Zeolite (hydrated sodium aluminum silicate) exchanges its Na⁺ ions for the Ca²⁺ and Mg²⁺ ions in hard water, thus softening it. It does not remove bacteria, dissolved gases, or suspended solids.

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