Name the acid present in the following:

(a) Tomato

(b) Vinegar

(c) Tamarind

A student dropped few pieces of marble in dilute HCl contained in a test tube. The evolved gas was passed through lime water.

(a) What change would be observed in lime water?

(b) Write balanced chemical equation for the above change.

What is the colour of FeSO₄.7H₂O crystals? How does this colour change upon heating? Give balanced chemical equation for the changes.

(a) What is an alkali? Give an example.

(b) Why do HCl, HNO₃, etc. show acidic characters in aqueous solutions while solutions while solutions of compounds like alcohol and glucose do not show acidic character?

Fill in the missing data in the following table: