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Question

The hard, plastic covers of telephones are made of polymers of:

A
styrene
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B
acrylonitrile
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C
phenol-formaldehyde
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D
fluoromethane
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Solution

The correct option is C phenol-formaldehyde
Bakelite is used for making of hard, plastic covers of telephones as it is non-breakable. Bakelite is a thermosetting polymer which once hardened cannot be melted back.
Bakelite is obtained by the polymerisation of phenol and formaldehyde.

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