From the formula listed below, choose one in each case, corresponding to the salt having the given descriptions:
`AgCl, CuCO_3 , CuSO_4 * 5H_2 O, KNO_3 , NaCl, NaHSO_4 , Pb(NO_3)_2 , ZnCO_3 , ZnSO_4 * 7H_2 O`
This salt gives nitrogen dioxide on heating.

Explanation

To solve the question, we need to identify which salt from the given list produces nitrogen dioxide (NO2) upon heating. Let's go through the steps systematically.

### Step 1: Identify the relevant salts
From the list of salts provided:
- AgCl
- CuCO3
- CuSO4 * 5H2O
- KNO3
...