When washing soda is treated with hydrochloric acid, it gives off colourless gas with lot of effervescence. What is the name of that gas formed?
CO2
When washing soda is treated with hydrochloric acid, a CO2 gas is produced with a lot of effervescence.
Na2CO3 + 2HCl→2NaCl+H2O+CO2↑.
CO2 is given out with brisk effervescence.