An oxide is acidic and has a pungent odour. It could be
  • sulphur dioxide
  • carbon dioxide
  • sodium oxide
  • nitrogen dioxide
Out of these gases which one is used in fire extinguishers
  • CO
  • SO
  • NO
  • H
The correct way of making a solution of acid in water is to
  • add water to acid
  • add acid to water
  • mix acid and water simultaneously
  • add water to acid in a shallow container
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. On adding its paste to acid and base separately, which colours would be observed.
  • 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
On adding phenolphthalein indicator to a colourless solution, no change is observed. What is the nature of this solution?
  • Basic
  • Either acidic or basic
  • Either acidic or neutral
  • Either basic or neutral
Which of the following is an acid-base indicator?
  • Vinegar
  • Lime water
  • Turmeric
  • Baking soda
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