Polymers are high molecular mass compounds having special properties and so used for special purposes. Identify the following polymers X, Y and Z.
a) X is a polymer resistant to heat and chemicals. People used it to make non-sticky frying pans.
b) Y is a polymer formed from ethylene glycol and terephthalic acid and used for making heart valves.
c) Z is a polymer used for making unbreakable crockery items.
