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 the action of solution B on litmus?
C.Name any two substances which give solutions like A.
D.Name any two substances which give solutions like B.
E.What sort of reaction takes place when A and B reacts with each other.

Hint: We have to remember that acid is any substance which donates protons having pH value less than $7$ whereas base is any substance that accepts a proton and has a $pH$ value greater than $7$ . The substances having pH equals to $7$ are neutral species. A universal indicator is nothing but a pH indicator that changes the color of litmus paper.

Complete answer:
A.What will be the action of solution A on litmus?
Answer- Solution A turns the universal indicator blue to purple so it is basic in nature and will turn the litmus to blue in color.
B.What will be the action of solution B on litmus?
Answer- Solution B turns universal indicator orange to red so it is acidic in nature and will turn the litmus to red in color.
C.Name any two substances which give solutions like A.
Answer- Since solution A is basic in nature, we have examples of bases such as sodium hydroxide, potassium hydroxide, milk of magnesia and many more.
D.Name any two substances which give solutions like B.
Answer- Since solution B is acidic in nature, we can have examples of acid such as Hydrochloric acid, sulfuric acid, lemon juice and many more.
E.What sort of reaction takes place when A and B reacts with each other.
Answer- Since A is a base and B is acid so when an acid and a base reacts together they form a neutralized product thus these types of reactions are known as neutralization reactions.

Note:
We have to know that a universal indicator is nothing but a pH indicator that changes the color of litmus paper. An acid for example hydrochloric acid when reacts with base sodium hydroxide forms a salt sodium chloride that is a neutral product and water, this is an example of neutralization reaction.