When dilute hydrochloric acid is added to a sodium compound A, then brisk effervescence of a gas B is produced. On passing this gas through lime-water, the lime-water turns milky dissolves forming a soluble compound D.
(a) What could be compound A ?
(b) Name the gas B.
(c ) Name the insoluble compound C.
(d) Name the soluble compound D.

When the gas formed on heating limestone is passed through freshly prepared lime water, the lime water turns milky.

When the gas formed on heating lime stone is passed through freshly prepared lime water, the lime water turns milky.

When a piece of limestone reacts with dilute HCl , a gas X is produced. When gas X is passed through lime water then a white precipitate Y is formed. On passing excess of gas X, the white precipitate dissolves forming a soluble compound Z. (a). What are X, Y and Z? (b). Write equations for the reactions which take place: (i). When limestone reacts with dilute HCl (ii). When gas X reacts with lime water to form white precipitate Y (iii). When excess of gas X dissolves white precipitate Y to form a soluble compound Z.