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BITSAT 2021
Exam
BITSAT
Year
2021
Subject
Chemistry
Chapter
Practical Chemistry

BITSAT 2021 · Chemistry · Practical Chemistry

When C_ 2 H_ 2 , CH_ 4 and C_ 2 H_ 4 pass through a test tube which...

When C2H2,CH4\mathrm{C}_{2} \mathrm{H}_{2}, \mathrm{CH}_{4} and C2H4\mathrm{C}_{2} \mathrm{H}_{4} pass through a test tube which has ammonical Cu2Cl2\mathrm{Cu}_{2} \mathrm{Cl}_{2}, find out which gas comes out unaffected from test tube?

Options

  1. AC2H2\mathrm{C}_{2} \mathrm{H}_{2} and CH4\mathrm{CH}_{4}
  2. BC2H2\mathrm{C}_{2} \mathrm{H}_{2} and C2H4\mathrm{C}_{2} \mathrm{H}_{4}
  3. CC2H4\mathrm{C}_{2} \mathrm{H}_{4} and CH4\mathrm{CH}_{4}
  4. DC2H2\mathrm{C}_{2} \mathrm{H}_{2}

Correct answer

C. C2H4\mathrm{C}_{2} \mathrm{H}_{4} and CH4\mathrm{CH}_{4}

Step-by-step solution

C2\mathrm{C}_{2}H2\mathrm{H}_{2}formscopperacetylidewithammonicalforms copper acetylide with ammonicalCu2Cl2\mathrm{Cu}_{2} \mathrm{Cl}_{2}Cu2Cl2+2NH4OH→Cu2O+H2O+2NH4ClCu2O+C2H2→Cu2C2 (copper acetylide) +H2O\begin{array}{l} \mathrm{Cu}_{2} \mathrm{Cl}_{2}+2 \mathrm{NH}_{4} \mathrm{OH} \rightarrow \mathrm{Cu}_{2} \mathrm{O}+\mathrm{H}_{2} \mathrm{O}+2 \mathrm{NH}_{4} \mathrm{Cl} \\ \mathrm{Cu}_{2} \mathrm{O}+\mathrm{C}_{2} \mathrm{H}_{2} \rightarrow \underset{\text{ (copper acetylide) }}{\mathrm{Cu}_{2} \mathrm{C}_{2}}+\mathrm{H}_{2} \mathrm{O} \end{array}
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