Question

Following observation were recorded upon performing experiments with sample 'A' and sample 'B'. (i) When 2-3 drops of phenolphthalein are added to sample 'A' it becomes pink. (ii) When equal quantities of two samples are added in a test-tube, the test-tube becomes hot.
A) sample 'A' is basic
B) sample 'B' is acidic
C) (ii) observation confirms neutralisation
D) All the above are correct.

Answer 1

Answer:

D)All of the above are correct

Explanation:

when phenolpthalein is added to basic solution it becomes pink in colour while with acidic solution no change will take place.so the solution A is basic in nature and the solution B is acidic in nature. so the option A and B are justified.

•Neutralisation reaction: The reaction between acid and base to give salt and water is called Neutralisation reaction. here when phenopthalen is added neutralization reaction take place .so the Option D is the correct option. Hope it helps!