A few reactions are given here.
I. Heating of solid sodium hydrogen carbonate.
II. Reaction of bleaching powder with sulphuric acid.
III. Heating gypsum to a temperature of 373 K
IV. Reaction of bleaching powder with hydrochloric acid.
Now, read the given passage and fill in the blanks by selecting an appropriate option. In reaction(s) `ul(p)`chlorine gas is given out while carbon dioxide is given out in reaction `ul(q)`. If one mole of gypsum is taken in reaction III, `ul(r)` moles of water are given out.

Options

A. `{:("p","q","r"),("II,III","I","3"):}`
B. `{:("p","q","r"),("II,IV","I",1 1/2):}`
C. `{:("p","q","r"),("II","IV","3"):}`
D. `{:("p","q","r"),("II,IV","I","3"):}`

Answer

To solve the question, we need to analyze each of the reactions mentioned and identify which gases are released and how many moles of water are produced when gypsum is heated.

### Step-by-Step Solution:

1. **Identify the reactions:**
- **I. Heating of solid sodium hydrogen carbonate (NaHCO₃):**
\[ 2 \text{NaHCO}_3 \rightarrow \text{Na}_2\text{CO}_3 + \text{CO}_2 + \text{H}_2\text{O} \]
- **Gas released:** Carbon dioxide (CO₂)

- **II. Reaction of bleaching powder with sulfuric acid (Ca(OCl)₂ + H₂SO₄):**
\[ \text{Ca(OCl)}_2 + \text{H}_2\text{SO}_4 \rightarrow \text{CaSO}_4 + \text{Cl}_2 + \text{H}_2\text{O} \]
- **Gas released:** Chlorine (Cl₂)

- **III. Heating gypsum to a temperature of 373 K (CaSO₄·2H₂O):**
\[ \text{CaSO}_4 \cdot 2\text{H}_2\text{O} \rightarrow \text{CaSO}_4 + 2\text{H}_2\text{O} \]
- **Moles of water released:** 2 moles of H₂O

- **IV. Reaction of bleaching powder with hydrochloric acid (Ca(OCl)₂ + HCl):**
\[ \text{Ca(OCl)}_2 + 2\text{HCl} \rightarrow \text{CaCl}_2 + \text{Cl}_2 + \text{H}_2\text{O} \]
- **Gas released:** Chlorine (Cl₂)

2. **Fill in the blanks:**
- **(p)**: Chlorine gas is given out in reactions II and IV.
- **(q)**: Carbon dioxide is given out in reaction I.
- **(r)**: If one mole of gypsum is taken in reaction III, 2 moles of water are given out.

### Final Answers:
- **(p)**: II and IV
- **(q)**: I
- **(r)**: 2