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BITSAT 2022
Exam
BITSAT
Year
2022
Subject
Chemistry
Chapter
Some Basic Concepts of Chemistry

BITSAT 2022 · Chemistry · Some Basic Concepts of Chemistry

A certain metal sulphide, M S_2 , is used extensively as a high...

A certain metal sulphide, MS2M S_2, is used extensively as a high temperature lubricant. If MS2\mathrm{MS}_2 is 40.06%40.06 \% by mass sulphur, metal MM has atomic mass.

Options

  1. A160u160 \mathrm{u}
  2. B64u64 \mathrm{u}
  3. C40u40 \mathrm{u}
  4. D96u96 \mathrm{u}

Correct answer

D. 96u96 \mathrm{u}

Step-by-step solution

MS2=M+32×2=M+64%M S_2=M+32 \times 2=M+64\% of sulphur =(64M+64)×100=40.06M+64=640040.06M+64=160M=160−64=96=\left(\frac{64}{M+64}\right) \times 100=40.06M+64=\frac{6400}{40.06}M+64=160M=160-64=96 u
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