Q10 / 30 · NTA Abhyas (JEE Main) 2020 · Chemistry · Polymers

Polyethylene is obtained from calcium carbide.

CaC2+2H2O→CaOH2+C2H2

C2H2+H2→C2H4

nC2H4→-CH2-CH2-n

Therefore, the amount of polyethylene (in kg) obtained for 64 kg CaC2 is

Correct answer: 28

Solution

Moles of CaC2=64×10364≅1×103

So from the balanced chemical equation, moles of C2H2= moles of C2H4

= moles of CaC2=1×103

So moles of polythene =1n×1×103

So weight of polythene =1n×1×1×28n kg

= 28 kg

Hence, the correct answer is 28.

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