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JEE Main2014ChemistrySome Basic Concepts of ChemistryActual

A gaseous compound of nitrogen and hydrogen contains 12.5 % (by mass) of hydrogen. The density of the compound relative to hydrogen is 16. The molecular formula of the compound is:

Options

  1. ANH ₂
  2. BN ₃ H
  3. CNH ₃
  4. DN ₂ H ₄

Correct answer

D. N ₂ H ₄

Step-by-step solution

In an unknown compounds containing N and H given % of H =12.5 % % of N=100-12.5=87.5 % array |c|c|c|c| Element & Percentage & Atomic ratio & Simple ratio H & 12.5 % & 12.5 1 =12.5 & 12.5 6.25 =2 N & 87.5 & 87.5 14 =6.25 & 6.25 6.25 =1 array 2 vapour density = Mol. wt =16 2=32 . Molecular formula =n empirical formula mass n= 32 16 =2 Molecular formula of the compound will be = ( NH ₂ )₂= N ₂ H ₄

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