Discussion
Fill in the blanks :
Bakelite is a __A__ and it is used for making __B__. On the other hand, PVC is a __C__ which is used for making __D__.
Answer: A
The answer is A-thermosetting plastic; B-electrical switches; C-thermoplastic; D-containers.
Bakelite is a thermosetting plastic: once moulded it sets permanently and does not soften on heating. Being a poor conductor of heat and electricity, it is used for electrical switches, plugs and the handles of utensils. PVC (polyvinyl chloride) is a thermoplastic: it softens on heating and can be reshaped, and it is used for pipes, containers, wire insulation and toys.
Options C and D swap the two types of plastic. Option B gives bakelite the use of containers and PVC the use of utensils, which reverses the properties that matter.
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