Question

A compound P is taken in a flat bottomed flask as shown in figure. Dilute hydrochloric acid is added drop by drop. A gas Q is evolved which is then passed in a test tube containing R. A solid precipitate S is formed. R is frequently used in white washing. During white washing a layer of R is applied on the wall and it reacts with gas Q present in air to produce white shiny layer of S on the wall. P, Q, R and S respectively are_____.

Answer 1

Answer:

P - NaCO3.....(it can be any carbonate )

Q - CO2 ( Carbon dioxide)

R - Ca(OH)2 ( Calcium hydroxide)

S - CaCO3 ( Calcium carbonate)