JEE Main · 2020 · 09 Jan 2020 · Shift 1 · Solid State

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X

' melts at low temperature and is a bad conductor of electricity in both liquid and solid state.

X

is:

(A)Silicon carbide
(B)Mercury
(C)Zinc sulphide
(D)Carbon tetrachloride✓ Correct

Answer: (D)

Solution

A solid that melts easily and conducts in neither the solid nor the liquid state must be held together by weak intermolecular forces rather than by ions, metallic bonding or a covalent network. Silicon carbide is a high-melting covalent network, mercury is a conducting metal, and zinc sulphide is ionic and conducts when molten. Carbon tetrachloride is a simple molecular substance with only van der Waals forces and no mobile charges, so it fits every clue.

JEE Main · 2020 · 09 Jan 2020 · Shift 1 · Single correct option

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