Four mixtures are given below
(i) Kidney beans and chick peas
(ii) Pulses and rice
(iii) Rice flakes and corn
(iv) Potato wafers and biscuits
Which of these can be separated by the method of winnowing?

Options

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

Explanation

To determine which of the given mixtures can be separated by the method of winnowing, we need to understand the principle behind this separation technique.

### Step-by-Step Solution:

1. **Understanding Winnowing**:
- Winnowing is a method used to separate lighter and heavier components of a mixture. It involves blowing air through the mixture, allowing the lighter particles to be carried away by the wind while the heavier particles fall to the ground.

2. **Analyzing the Mixtures**:
- (i) **Kidney beans and chick peas**: Both are similar in weight and size, making it difficult to separate them using winnowing.
- (ii) **Pulses and rice**: Pulses and rice are also similar in weight and size, so winnowing would not be effective here.
- (iii) **Rice flakes and corn**: Rice flakes are lighter than corn. When winnowed, the rice flakes can be carried away by the wind while the heavier corn will fall.
- (iv) **Potato wafers and biscuits**: Potato wafers are lighter than biscuits. In this case, the potato wafers can be blown away by the wind while the heavier biscuits will remain.

3. **Conclusion**:
- The mixtures that can be separated by winnowing are:
- (iii) Rice flakes and corn
- (iv) Potato wafers and biscuits

### Final Answer:
The mixtures that can be separated by the method of winnowing are:
- (iii) Rice flakes and corn
- (iv) Potato wafers and biscuits

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