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In hot pin test on a substance,the given...

In hot pin test on a substance,the given observations were done by a student.
a)Hot pin did not penetrate
b)It left a purple bun mark.
c)It gave the acidic smell.
Then the conclusion is the substance is made with

A

`1`. Melamine

B

`2`. Bakelite

C

`3`. Nylon

D

`4`.Thermoplastic

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