Acids and Bases

What is gastric acid present in the stomach composed of?

• Hydrochloric acid

• Sulphuric acid

• Nitric acid

• Lactic acid

To protect tooth decay, one is advised to brush the teeth regulary. The ingredient of the paste which checks tooth decay is:

• Acidic

• Basic

• Neutral

• Corrosive

Tomato is a natural source of which acid?

• Acetic

• Citric

• Tartaric

• Oxalic

Rain is called acid rain when its:

• pH falls below 7

• pH falls below 6

• pH falls below 5.6

• pH above 7

Sodium hydroxide turns phenolphthalein solution

• Pink

• Yellow

• Colourless

• Orange

What is the pH range of our body?

• 7.0 – 7.8

• 7.2 – 8.0

• 7.0 – 8.4

• 7.2– 8.4

Tooth enamel is made up of

• Calcium Phosphate

• Calcium Carbonate

• Calcium Oxide

• Potassium

Brine solution is

• aqueous solution of sodium hydroxide

• aqueous solution of sodium carbonate

• aqueous solution of sodium chloride

• aqueous solution of sodium bicarbonate

Alkalis are

• acids, which are soluble in water

• acids, which are insoluble in water

• bases, which are insoluble in water

• bases, which are soluble in water

Nettle sting is a natural source of which acid?

• Methanoic Acid

• Lactic Acid

• Citric Acid

• Tartaric Acid