CBSE Class 10 Science 2015 Term II Delhi Set 1

Question : 26

Total: 36

A student prepared 20% sodium hydroxide solution in a beaker to study saponification reaction. Some observations related to this are given below :
(I) Sodium hydroxide solution turns red litmus blue
(II) Sodium hydroxide readily dissolves in water
(III) The beaker containing solution appears cold when touched from outside.
(IV) The blue litmus paper turns red when dipped into the solution
The correct observations are :

I, II and IV
I, II, and III
only III and IV
only I and II

Solution:

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