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

styrene

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acrylonitrile

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phenol-formaldehyde

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

The correct option is C phenol-formaldehydeBakelite 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.

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.