Question

Which of the following is/are true when milk changes into curd?
(i) Its state is changed from liquid to semi-solid.
(ii) It changes colour.
(iii) It changes taste.
(iv) The change cannot be reversed.

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

Answer 1

Answer: (D)

$\left(i\right)$ Milk is in the liquid state and curd is semi-solid. Hence, first statement is true.

$\left(ii\right)$ Colour remains the same when milk changes to curd. Both are white in colour.

$\left(iii\right)$ There is a change in the taste when milk changes to curd.

$\left(iv\right)$ As it is a chemical change, it can't be reversed.

$\therefore$ $i,iii,iv$ are correct.