Question

Q11) Animal activists are against silk production. Why?

Q12 a) Why do curd, lemon juice and tamarind taste sour? b) Name the bases present in
i)window cleaner ii) soaps

c) Assertion(A): Tearing of paper into small pieces is a chemical 1
change. Reason(R): It is not possible to rejoin small pieces of
paper to get back the original paper sheet.
i) Both A and R are true and R is the correct explanation of
A
ii)Both A and R are true but is not the correct explanation
of A
iii) A is true but R is false
iv) A is false but R is true.​

Answer 1

11. During silk production, cocoons are thrown in boiling water. As a result, the silk worms die. So, animal activists are against it.

12. a). Curd, lemon juice and tamarind all contain acid. So they are acidic and          acids are sour in taste.

    b). i). ammonium hydroxide (NH4OH)

         ii). sodium hydroxide (NaOH) or potassium hydroxide (KOH)

    c). iv). A if false but R is true