Question

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Q. 3. Given below are the steps to test the presence of proteins in a food item:
[NCERT Exemplar
(1) Take a small quantity of the food item in a test tube, add 10 drops of water to it and shake it.
(ü) Make a paste or powder of food to be tested.
(iii) Add 10 drops of caustic soda solution to the testtube and shake well.
(iv) Add 2 drops of copper sulphate solution to it.
Which of the following is the correct sequence of the steps ?
(a) (i), (i), (iv), (iii)
(b) (i), (i), (iv), (iii)
(c) (i), (i), (iii), (iv)
(d) (iv), (ii), (i), (iii)
Ans.
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Answer 1

Answer:

With

Explanation:

The presence of protein in a food material is tested on the basis of a reaction between proteins and alkaline solution of copper sulphate, that gives a violet color.

Test involves the sequence in ii, i, iii, iv

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Answer 2

Answer:

(ii), (i), (iii), (iv)

Explanation:

(ii), (i), (iii), (iv) IS THE CORRECT SEQUENCE!