How is a universal indicator better than litmus solution?

A universal indicator is

What is a universal indicator ?

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?

A salt is dissovled in water and the pH of this salt solution is measured with a universal indicator papre. If the pH of solution is less than 7, the salt is most likely to e:

In a experiment to measure the pH values of solutions, a student placed strips of universal indicator paper in foru beakes containig solutions A,B, C and D. The colour of universal indicator paper in these solutions is a shown below: The solution having lowes pH value is:

A student adds a few drops of the universal indicator solution to a dilute solution of sodium hydroencarbnonate taken in a test tube. Which of the following colour would he observe?

Whch of the following solutions should be put on a universal indicator paper so that its colour may change to green?