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ICSE Class 10 Chemistry 2023 Paper

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Arrange the following according to the instructions given in brackets :
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Question : 79 of 88
Marks: +1, -0
C2H2,C3H6,CH4,C2H4\mathrm{C}_2\mathrm{H}_2, \mathrm{C}_3\mathrm{H}_6, \mathrm{CH}_4, \mathrm{C}_2\mathrm{H}_4 In the increasing order of the molecular weight)
Solution:  
CH4<C2H2<C2H4<C3H8\mathrm{CH}_4 < \mathrm{C}_2\mathrm{H}_2 < \mathrm{C}_2\mathrm{H}_4 < \mathrm{C}_3\mathrm{H}_8
Molecular weight of
  CH4=12+4=16\; \mathrm{CH}_4=12+4=16
  C2H2=12×2+2×1=26\; \mathrm{C}_2\mathrm{H}_2=12 \times 2+2 \times 1=26
  C2H4=12×2+4=28\; \mathrm{C}_2\mathrm{H}_4=12 \times 2+4=28
  C3H8=12×3+8=44\; \mathrm{C}_3\mathrm{H}_8=12 \times 3+8=44
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