Match List - I with List -II and select the correct answer from the codes given below the lists : List – I (Metal) A) Sodium B) Mercury C) Silver D) Lead List – II (Property) 1) Good conductor of electricity 2) Liquid at room temperature 3) Poor conductor of heat 4) Can be easily cut with knife

The correct match is A-4, B-2, C-1, D-3, which is option C.

• Sodium (A) to 4: Sodium is a soft alkali metal that can be cut with a knife.
• Mercury (B) to 2: Mercury is the only metal that is liquid at room temperature (melting point about -38.8 °C).
• Silver (C) to 1: Silver is the best conductor of electricity among all metals, better than copper.
• Lead (D) to 3: Lead is a poor conductor of heat compared with most metals.

The core concept is the physical and electrical properties of metals: state, hardness, electrical conductivity and thermal conductivity. This links to Science and Technology (material selection for wiring, cookware and batteries).

Option A fails because sodium is solid and mercury is not a poor heat conductor. Option B wrongly makes silver a poor heat conductor. Option D gets sodium and mercury wrong.

Trap: Lead is also soft and can be cut with a knife, so a candidate may match D-4. Pair sodium with the knife-cutting property, since that is the standard textbook association, and use the unique properties (liquid state for mercury, best conductivity for silver) to fix the rest.