Preparation of Carbon Dioxide

Q. The diagram given below represents the set up for the laboratory prepration of carbon dioxide gas. Identify A, B and C.

1. A - Marble chips, B - Dilute $\text{HCl}$, C - ${\text{O}}_2$
2. A - Marble chips, B - Dilute $\text{HCl}$, C - ${\text{CO}}_2$
3. A - Dilute $\text{HCl}$, B - Marble chips, C - ${\text{O}}_2$
4. A - Dilute $\text{HCl}$, B - Marble chips , C - ${\text{CO}}_2$

Q.

Hello sir I want to ask you a question which is not in the byjus app it is from the chapter language of chemistry.

The equation which is given below is my doubt as I cant solve it .

CaCO2 +HCl= CaCl2 +CO2 +H2O

Q.

Ram prepared some tasty food and was smelling delicious, but after 2 days he found some foul smell from that tasty food, he is amazed how can that happen. Help Ram with this with the help of an explanation that why spoiled food produces foul smell? [3 MARKS]