Question

Solution A turns universal indicator blue to purple whereas solution B turns universal indicator orange to red.
(a) What will be the action of solution A on litmus ?
(b) What will be action of solution B on litmus ?
(c) Name any two substances which can give solutions like A.
(d) Name any two substances which can give solutions like B.
(e) What sort of reaction takes place when solution A reacts with solution B ?

Lakhmir Singh Chemistry Class 10

Answer 1

Answer:

i) Since universal indicator is being turned from blue to purple, therefore solution A is a basic solution and hence litmus paper will be turned to blue by  the action of solution A.

ii) Since universal indicator is being turned from orange to red, therefore solution B is an acidic solution and hence litmus paper will be turned to red by  the action of solution A.

iii) Two substances which are basic and can give solutions like A are Calcium hydroxide and Sodium hydroxide.

iv) Two substances which are acidic and can give solutions like B are orange juice and lemon juice.

v) When solution A reacts with solution B , the type of reaction that will occur is called neutralization reaction as they will balance out the pH.