Question

Carbon and hydrogen in an organic compound are detected as ______.

• A. $CaHC{O}_3,CuS{O}_4\cdot 5H_{2}O$
• B. $CaC{O}_3,CuS{O}_4\cdot 5H_{2}O$
• C. $CaC{O}_3,Cu(OH{)}_2$
• D. $CaHC{O}_3,CaC{O}_3$

Answer 1

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

Carbon and hydrogen in an organic compound are detected as
$CaC{O}_3,CuS{O}_4\cdot 5H_{2}O$
The organic compound is heated with dry copper oxide when 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 sulphate (white) which turns blue (hydrated copper sulphate).