Class 7 Quiz

The acid produced naturally in our stomach is

• tartaric acid

• citric acid

• hydrochloric acid

• sulphuric acid

Products of a neutralisation reaction are always

• an acid and a base

• an acid and a salt

• a salt and water

• a salt and a base

Turmeric is a natural indicator. it gives

• Yellow in both acid and base

• Yellow in acid and red in base

• Pink in acid and yellow in base

• Red in acid and blue in base

Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions, respectively are

• red and blue

• blue and red

• pink and colourless

• colourless and pink

When the soil is too basic, plants do not grow well in it. To improve its quality what must be added to the soil?

• Organic matter

• Quick lime

• Slaked lime

• Calamine solution

Which of the following set of substances contain acids?

• Grapes, lime water

• Vinegar, soap

• Curd, milk of magnesia

• Curd, vinegar

Which one of the following will turn red litmus blue?

• Vinegar

• Baking soda solution

• Lemon juice

• Soft drinks

Acids turns blue litmus

• red

• orange

• blue

• green

In case of indigestion, we use

• Antipyretic

• Antibiotic

• Antacids

• Alcohols

The colour of china rose indicator in a basic solution

• Red

• Pink

• Green

• Blue