Write an equation to show the reaction between Plaster of Paris and water.

A solution turns red litmus blue, its pH is likely to be

1. 1
2. 4
3. 5
4. 10

10 mL of a solution of NaOH is found to be completely neutralized by 8 mL of a given solution of HCl. If we take 20 mL of the same solution of NaOH, the amount of HCl solution (the same solution as before) required to neutralize it will be

1. 4 mL
2. 8 mL
3. 12 mL
4. 16 mL

Which one of the following types of medicines is used for treating indigestion?

1. Antibiotic
2. Analgesic
3. Antacid
4. Antiseptic