CBSE  /  Class 7  /  Science  /  Acids, Bases and Salts

  • 1. 
    An oxide is acidic and has a pungent odour. It could be

  • sulphur dioxide
  • carbon dioxide
  • sodium oxide
  • nitrogen dioxide

  • 2. 
    Out of these gases which one is used in fire extinguishers

  • CO
  • SO
  • NO
  • H

  • 3. 
    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

  • 4. 
    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

  • 5. 
    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

  • 6. 
    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

  • 7. 
    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

  • 8. 
    Which of the following set of substances contain acids?

  • Grapes, lime water
  • Vinegar, soap
  • Curd, milk of magnesia
  • Curd, vinegar

  • 9. 
    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

  • 10. 
    Which of the following is an acid-base indicator?

  • Vinegar
  • Lime water
  • Turmeric
  • Baking soda
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