Acids, Bases and Salts

What is the taste of acid?

• Salty

• Sweet

• Sour

• Bitter

Which is not a property of acids?

• These are sour to taste.

• Acids turn blue litmus red

• Acids do not change the colour of turmeric indicator.

• With china rose indicator, these give dark pink colour.

• Acids turn red litmus blue.

Ammonia is found in many household products, such as window cleaners. It turns red litmus blue. What is its nature?

• Acidic

• Basic

• None of the above

• Neutral

Blue litmus paper is dipped in a solution. It remains blue. What is the nature of the solution?

• Acidic

• Either basic or neutral in nature

• Basic

• None of the above

Factory wastes contain _________

Sodium hydroxide is a/an ________

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

• Red and blue

• Colorless and pink

• Colorless and blue

• Red and pink

• Red and colorless

‘Litmus’, a natural dye is an extract of which of the following?

• China rose (Gudhal)

• Beetroot

• Blue berries (Jamun)

• Lichen

________ Acid is present in Tamarind

What is injected into the skin when an ant bites?

• Citric acid

• Tamarind

• Formic acid

• Salt