Science : Ch 02 – Acids Bases and Salts

Calcium phosphate is present in tooth enamel. Its nature is:

Which of the Subsequent salts does not carry water of crystallisation?

A visually challenged student, has to carryout a lab test to detect the presence of acid in a given solution. The acid-base indicator favoured by him will be:

Common salt other than being used in kitchen can also be used as the raw material for  making:

1. Washing soda
2. Bleaching powder
3. Baking soda
4. Slaked lime

Sodium hydrogen carbonate when added to acetic acid evolves a gas. Which of the following declaration are true about the gas evolved?

1. It turns lime water milky
2. It extinguishes a burning splinter.
3. It dissolves in a solution of sodium hydroxide.
4. It has a pungent odour

Which of the subsequent is/are true when HCl(g) is passed through water?

1. It does not ionise in the solution as it is a covalent compound
2. It ionises in the solution
3. It gives both hydrogen and hydroxyl ions in the solution.
4. It forms hydronium ion in the solution due to the combination of hydrogen ion with water molecule

An old person complained of acute pain in stomach. Doctor gave small antacid tablet and he got immediate relief. What actually happened?

Antacid are

The source of lactic acid is

The source of Acetic acid is

The source of citric acid is

The chemical used for cleaning swimming pools

Washing soda is prepared from

How many water molecules are present in plaster of paris

Common name calcium sulphate hemihydrate