Acids and Bases

The taste of acids is

• Sweet

• Bitter

• Sour

• Salty

The pH value of an acid is

• Less than 7

• Equal to 7

• More than 7

• Either less than 7 or more than 7

Which of the following acids is contained in apples?

• Hydrochloric acid

• Citric acid

• Malic acid

• Tartaric acid

Which of the following generally reacts with acids to form a salt and hydrogen gas?

• Alkalis

• Carbonates

• Metals

• Nitrates

The acid used in making fertilizers and explosives is

• Hydrochloric acid

• Carbonic acid

• Sulphuric acid

• Nitric acid

Which of the following acids is produced in our stomach?

• Carbonic acid

• Sulphuric acid

• Hydrochloric acid

• Nitric acid

One property of sodium hydroxide is that it

• Turns blue litmus paper red

• Turns red litmus paper blue

• tastes sour

• is not reactive

Which of the following substances has a pH of more than 7?

• Oxalic acid

• Calcium Hydroxide

• Methyl Orange

• Hydrogen gas

When an indicator is added to solutions of different pH values, it should show a change in

• Color

• Volume

• State

• Smell

When phenolphthalein is added to an alkaline solution , it turns

• White

• Colorless

• Pink

• Green