Question

Given below are the steps to test the presence of proteins in a food item.

Which of the following is the correct sequence of the steps?

• A. i, ii, iv, iii
• B. ii, i, iv, iii
• C. ii, i, iii, iv
• D. iv, ii, i, iii

Answer 1

The correct option is B

ii, i, iv, iii

The correct option is B.

Explanation of correct option:

To test the presence of proteins in a food item

1. Make a paste or powder of food to be tested.
2. Take a small quantity of the food item in a test tube, add 10 drops of water to it and shake it.
3. Add 2 drops of copper sulfate solution to it.
4. Add 10 drops of caustic soda solution to the test tube and shake well.
5. Let the test tube stand for a few minutes and observe the color of the solution in the test tube.
6. The appearance of violet color indicates the presence of proteins in the given food.

Explanation of incorrect options:

As the correct sequence of steps is ii, i, iv, iii, therefore all other options will be incorrect.

Final Answer: The correct sequence of the steps are ii, i, iv, iii.