Question

1.
A solid compound 'X'on heating gives Co, gas and
a residue. The residue mixed with water forms 'Y".
On paeshna excess of CO, through 'Y' in water, a clear
solution is obtained. On boiling Z, compound
is reformed. The compond 'X' is :
(1) Caco
(2) Na.Co
(4) Ca(HCO),​

Answer 1

na. co ................