Question

Carbon and hydrogen in an organic compound are detected as:

• A. $MgC{O}_3,anhyd.CuS{O}_4$
• B. $CaC{O}_3,CuS{O}_4.5H_{2}O$
• C. $CaC{O}_3,Cu(OH{)}_2$
• D. $CaO,CaC{O}_3$

Answer 1

The correct option is B $CaC{O}_3,CuS{O}_4.5H_{2}O$

Carbon and hydrogen in an organic compound are detected as $CaC{O}_3\&CuS{O}_4\cdot 5H_{2}O$ respectively.
The organic compound is heated with dry copper oxide . C and H of the organic compound are oxidized to carbon dioxide and water.
Carbon dioxide is detected by passing it through lime to form calcium carbonate and the presence of hydrogen is detected by passing it through anhydrous copper sulfate (white) which turns blue on hydration $CuS{O}_4.5H_{2}O$ (hydrated copper sulfate).