Properties and Uses of Carbon Dioxide

Q.

Carbogen is a mixture of 95%_______ and 5%_______.

Q. What are the constituents of carbogen?

1. 95% of $O_2$ and 5% of $C{O}_2$
2. 50% of $O_2$ and 50% of $C{O}_2$
3. 30% of $O_2$ and 70% of $C{O}_2$
4. 70% of $O_2$ and 30% of $C{O}_2$

Q. What will be the action of the following substances on red and blue litmus paper?

• Dry HCl gas
• Moistened ${\text{NH}}_3$ gas
• Lemon juice
• Carbonated soft drink
• Curd
• Soap solution.

Q. Ingredients used in kitchens always amazes us through their magic. One of them is baking powder which has a compound X as its major constituent. The compound X sometimes also helps in getting relief from acid indigestion or even in ant bite. In the laboratory, when we heat compound X, it gets converted into Y which is anhydrous but absorbs water to become a hydrated salt Z, one of the raw materials of soaps and detergents.

(ii) Identify the compound Y and Z from the following:

1. Y: $NaHC{O}_3$, Z: $N{a}_{2}C{O}_3.10H_{2}O$
2. Y: $N{a}_{2}C{O}_3$, Z: $N{a}_{2}C{O}_3.10H_{2}O$
3. Y: $NaOH$, Z: $NaCl$
4. Y: $NaHC{O}_3$, Z: $N{a}_{2}C{O}_3$