Which of the following statements are incorrect?
I. Mixture of kidney beans and chick peas can be separated by winnowing
II. Salt from sea water can be obtained on a large scale by evaporation.
III An alloy is a homogeneous mixture of a metal with another metal or non-metals.
IV Seeds of wheat can be separated from a bundle of wheat stalks by sieving.

Options

A. II and III only
B. I and IV only
C. I,III and IV only
D. None of these

Explanation

To determine which statements are incorrect, let's analyze each statement one by one:

### Step 1: Analyze Statement I
**Statement I:** Mixture of kidney beans and chickpeas can be separated by winnowing.
- **Explanation:** Winnowing is a method used to separate lighter particles from heavier ones, typically used for separating grains from chaff. Kidney beans and chickpeas are both similar in size and weight, so winnowing is not an appropriate method for this separation.
- **Conclusion:** This statement is incorrect.

### Step 2: Analyze Statement II
**Statement II:** Salt from sea water can be obtained on a large scale by evaporation.
- **Explanation:** This statement is true. Salt is commonly extracted from seawater through the process of evaporation, where water is allowed to evaporate, leaving the salt behind.
- **Conclusion:** This statement is correct.

### Step 3: Analyze Statement III
**Statement III:** An alloy is a homogeneous mixture of a metal with another metal or non-metals.
- **Explanation:** This statement is true. An alloy is indeed a homogeneous mixture, which can consist of metals combined with other metals or non-metals.
- **Conclusion:** This statement is correct.

### Step 4: Analyze Statement IV
**Statement IV:** Seeds of wheat can be separated from a bundle of wheat stalks by sieving.
- **Explanation:** Sieving is a method used to separate particles based on size. In this case, wheat seeds can be separated from the stalks as the seeds will pass through the sieve while the larger stalks will remain.
- **Conclusion:** This statement is correct.

### Final Conclusion
- The incorrect statements are:
- I. Mixture of kidney beans and chickpeas can be separated by winnowing (incorrect).
- IV. Seeds of wheat can be separated from a bundle of wheat stalks by sieving (correct).

Thus, the answer is that **Statement I** is incorrect.