Question

Answer the following question with respect to charcoal cavity test.

(1) What is A

(2) Name the place where mercuric oxide is placed.

(3) What do you observe in this experiment?

(4) What is the function of the blowpipe?

(5) Give the chemical reaction taking place.

Answer 1

(1) A is metallic Mercury.

(2) In the flame region behind the sample of charcoal mercury oxide is released.

(3) In this experiment reduction of mercury oxide to metallic mercury takes place.

$\mathrm{HgO}\left(\mathrm{s}\right)+\mathrm{C}\underset{}{\left(\mathrm{s}\right)\to \mathrm{Hg}\left(\mathrm{l}\right)+\mathrm{CO}}\left(\mathrm{g}\right)$

(4) The function of the blowpipe is Mixing the given salt with sodium carbonate and heating the mixture on the block of charcoal with the help of blow pipe in reducing flame.

(5) $\mathrm{HgO}\left(\mathrm{s}\right)+\mathrm{C}\left(\mathrm{s}\right)\underset{}{\to \mathrm{Hg}\left(\mathrm{l}\right)+\mathrm{CO}\left(\mathrm{g}\right)}$