Reaction of Sulphuric Acid with Salts

Q.

When phenolphthalein is added to $\mathrm{NaOH}$, the colour of the solution will become $\mathrm{\_\_\_\_\_\_\_\_\_\_\_\_}$

1. Colourless

2. red

3. pink

4. yellow

Q.

How does one ascertain that a chemical reaction has happened when NaOH is added to phenolphthalein solution?

Q.

On adding few drop of phenolphthalein indicator to a solution X , the solution become pink. Predict the nature of the solution.

Q. Colour of phenolphthalein solution changes to _______ on addition of a base.

1. blue
2. pink
3. yellow
4. green