Representation of a Chemical Equation

Q. Identify the compound $\text{X}$ in the given equation.
$\text{Citric acid + X}\to \text{Carbon dioxide + Sodium citrate + Water}$

1. Sodium hydroxide
2. Sodium nitrate
3. Sodium bicarbonate
4. Sodium chloride

Q. Which gas is produced when sulphuric acid reacts with sodium carbonate?

1. None of the above
2. Carbon dioxide gas
3. Hydrogen gas
4. Oxygen gas

Q. Balance the following equation:​

${\text{Zn + HNO}}_3\to {\text{Zn(NO}}_3{\text{)}}_2+{\text{H}}_2\text{O}+{\text{NO}}_2$

Q. WRITE BALANCED MOLECULAR EQUATIONS FOR THE FOLLOWING WORD EQUATIONS :
(x)Aluminium + Oxygen ​→ Aluminium oxide

Q. is conserved in a chemical reaction.

1. Mass
2. Density
3. Volume

Q.

$CaO\left(s\right)+H_{2}O\left(l\right)\to Ca\left(OH{)}_2\right(aq)+heat$

What can be inferred from the above reaction?

(i) $CaO$ is solid.

(ii) $CaO$ is reactive with water.

(iii) $H_{2}O$ is liquid.

(iv) $H_{2}O$ is in vapour state.

(v) $Ca(OH{)}_2$ forms a solution with water

(vi) The reaction is exothermic.

1. (i), (iii), (iv), (vi)

2. (i), (ii), (iii), (v), (vi)

3. (v), (iv)

4. (ii), (iii), (v), (iv)

Q.

what will be the result when sodium bicarbonate(baking soda) will react with vinegar. give the chemical equation. give chemical name of vinegar.