Match list I with list II and choose the correct answer from the codes given below`-`
`{:("List "I,,"List "II),((i)NaNO_(3),,(a)"Baking soda"),((ii) Na_(2)BB_(4)O_(3).10H_(2)O,,(b)"Chile salt peter"),((ii) NaHCO_(3),,(c )"Borax"),((iv)Na_(2)CO_(3).10H_(2)O,,(d)"Washing soda"):}`
Code `:`

Options

A. `{:(,i,ii,iii,iv),((1),a,b,c,d):}`
B. `{:(,i,ii,iii,iv),((2),b,c,a,d):}`
C. `{:(,i,ii,iii,iv),((3),c,a,b,d):}`
D. `{:(,i,ii,iii,iv),((4),d,a,b,c):}`

Explanation

To solve the problem of matching List I with List II, we will analyze each compound in List I and identify its corresponding name in List II.

### Step-by-Step Solution:

1. **Identify NaNO3:**
- NaNO3 is known as sodium nitrate. It is commonly referred to as "Chile saltpeter" because it was historically obtained from deposits in Chile.
- **Match:** (i) NaNO3 → (b) Chile saltpeter

2. **Identify Na2B4O7.10H2O:**
- Na2B4O7.10H2O is known as borax. It is a compound used in cleaning products and has a distinctive crystalline structure.
- **Match:** (ii) Na2B4O7.10H2O → (c) Borax

3. **Identify NaHCO3:**
- NaHCO3 is commonly known as sodium bicarbonate or baking soda. It is widely used in baking as a leavening agent.
- **Match:** (iii) NaHCO3 → (a) Baking soda

4. **Identify Na2CO3.10H2O:**
- Na2CO3.10H2O is known as washing soda. It is used for cleaning and removing stains.
- **Match:** (iv) Na2CO3.10H2O → (d) Washing soda

### Final Matching:
- (i) NaNO3 → (b) Chile saltpeter
- (ii) Na2B4O7.10H2O → (c) Borax
- (iii) NaHCO3 → (a) Baking soda
- (iv) Na2CO3.10H2O → (d) Washing soda

### Conclusion:
The correct matching is:
- (i) → (b)
- (ii) → (c)
- (iii) → (a)
- (iv) → (d)

Thus, the correct code for the answer is **2**.