Match the entries of column I with appropriate entries of coloumn II. Each entry in column I may have one or more than one correct option from column II. If the correct matches are A-p, s , B-r, C-p, q , D-s, then the correctly bubbled 4 `xx` 4 matrix should be as follows :
`{:(,"Column I (Reaction)",,"Column II (Product)"),((A),Cu + dil. HNO_(3),(p),NO),((B),Cu + conc. HNO_(3),(q),NO_(2)),((C),Zn + dil. HNO_(3),(r),N_(2)O),((D),Zn + conc. HNO_(3),(s),Cu(NO_(3))_(2)),(,,(t),Zn(NO_(3))_(2)):}`

Answer

To solve the matching problem between Column I (Reactions) and Column II (Products), we need to analyze the reactions of copper and zinc with dilute and concentrated nitric acid (HNO3) and identify the products formed.

### Step-by-Step Solution:

1. **Identify the Reaction for A: Cu + Dil. HNO3**
- When copper reacts with dilute nitric acid, the primary products are copper(II) nitrate (Cu(NO3)2) and nitrogen monoxide (NO).
- **Balanced Reaction**:
\[ 3 \text{Cu} + 8 \text{HNO}_3 \rightarrow 3 \text{Cu(NO}_3)_2 + 2 \text{NO} + 4 \text{H}_2\text{O} \]
- **Match**: A matches with **(p) NO** and **(s) Cu(NO3)2**.

2. **Identify the Reaction for B: Cu + Conc. HNO3**
- When copper reacts with concentrated nitric acid, the products are copper(II) nitrate (Cu(NO3)2) and nitrogen dioxide (NO2).
- **Balanced Reaction**:
\[ \text{Cu} + 4 \text{HNO}_3 \rightarrow \text{Cu(NO}_3)_2 + 2 \text{NO}_2 + 2 \text{H}_2\text{O} \]
- **Match**: B matches with **(q) NO2** and **(s) Cu(NO3)2**.

3. **Identify the Reaction for C: Zn + Dil. HNO3**
- When zinc reacts with dilute nitric acid, the products are zinc nitrate (Zn(NO3)2) and nitrous oxide (N2O).
- **Balanced Reaction**:
\[ \text{Zn} + 4 \text{HNO}_3 \rightarrow \text{Zn(NO}_3)_2 + 2 \text{N}_2\text{O} + 2 \text{H}_2\text{O} \]
- **Match**: C matches with **(q) N2O** and **(t) Zn(NO3)2**.

4. **Identify the Reaction for D: Zn + Conc. HNO3**
- When zinc reacts with concentrated nitric acid, the products are zinc nitrate (Zn(NO3)2) and nitrogen dioxide (NO2).
- **Balanced Reaction**:
\[ \text{Zn} + 4 \text{HNO}_3 \rightarrow \text{Zn(NO}_3)_2 + 2 \text{NO}_2 + 2 \text{H}_2\text{O} \]
- **Match**: D matches with **(q) NO2** and **(s) Zn(NO3)2**.

### Final Matches:
- A: (p) NO, (s) Cu(NO3)2
- B: (q) NO2, (s) Cu(NO3)2
- C: (r) N2O, (t) Zn(NO3)2
- D: (q) NO2, (s) Zn(NO3)2

### Summary of Matches:
- A - p, s
- B - q, s
- C - r, t
- D - q, s