Which two of the following are used for preparing iodised salt?
(i) `KIO_(3)` (ii) KI (iii) `I_(2)` (iv) HI

Options

A. (i) and (ii)
B. (i) and (iii)
C. (ii) and (iv)
D. (iii) and (iv)

Answer

To determine which two compounds are used for preparing iodized salt from the given options (i) KIO₃, (ii) KI, (iii) I₂, and (iv) HI, we can follow these steps:

### Step 1: Understand what iodized salt is
Iodized salt is common table salt that has been fortified with iodine, an essential nutrient. The iodine is typically added in the form of iodide salts.

**Hint:** Remember that iodized salt is simply table salt with added iodine in some form.

### Step 2: Identify the iodine sources
The common sources of iodine used in iodized salt include:
- Potassium iodate (KIO₃)
- Potassium iodide (KI)
- Sodium iodide (NaI)
- Sodium iodate (NaIO₃)

**Hint:** Look for compounds that contain iodine in the form of iodide or iodate.

### Step 3: Analyze the options
Now, let's analyze the given options:
1. KIO₃ (Potassium iodate) - This is a source of iodine.
2. KI (Potassium iodide) - This is also a source of iodine.
3. I₂ (Iodine) - This is elemental iodine and is not typically used directly for iodized salt.
4. HI (Hydroiodic acid) - This is a strong acid and not used for iodized salt.

**Hint:** Focus on the compounds that are commonly used in food products for iodine supplementation.

### Step 4: Conclusion
From the analysis, the two compounds that can be used for preparing iodized salt are:
- KIO₃ (Potassium iodate)
- KI (Potassium iodide)

Thus, the correct answer is (i) KIO₃ and (ii) KI.

**Final Answer:** (i) KIO₃ and (ii) KI