Read the given paragraph where few words
have been italicised.
To test the presence of proteins in food
sample, take some crushed food item in
a test tube and add required amount of
water to it. Then, add two drops of copper
sulphate solution and ten drops of caustic
soda solution to the test tube and shake it
well. Leave the test tube undisturbed for
few minutes and observe the colour change.
If the colour of the food sample turns red
then it indicates presence of proteins in
the food sample.
Select the correct option regarding it.
A Proteins should be replaced with
carbohydrates and caustic soda should
be replaced with iodine.
B Positions of two and ten should be
interchanged as they are mentioned
incorrectly.
C Water should not be replaced and red
should be replaced with violet.
D Water should be replaced with ethanol
and red should be replaced with yellow.
but red is correct, most schools say that...