NCERT Class VII Science Solutions: Chapter 5-Acids, Bases and Salts Part 1 (For CBSE, ICSE, IAS, NET, NRA 2023)

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Question 1:

The correct way of making a solution of acid in water is to

  1. Add water to acid.
  2. Add acid to water.
  3. Mix acid and water simultaneously.
  4. Add water to acid in a shallow container.

Answer: B

Question 2:

Products of a neutralization reaction are always

  1. An acid and a base.
  2. An acid and a salt.
  3. A salt and water.
  4. A salt and a base.

Answer: C

Question 3:

Turmeric is a natural indicator. On adding its paste to acid and base separately, which colours would be observed

  1. Yellow in both acid and base.
  2. Yellow in acid and red in base.
  3. Pink in acid and yellow in base.
  4. Red in acid and blue in base.

Answer: B

Question 4:

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

  1. Red and Blue.
  2. Blue and Red.
  3. Pink and Colourless.
  4. Colourless and Pink.

Answer: D

Question 5:

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

  1. Organic matter
  2. Quick lime
  3. Slaked lime
  4. Calamine solution

Answer: A

Question 6:

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

  1. China rose (Gudhal)
  2. Beetroot
  3. Lichen
  4. Blue berries (Jamun)

Answer: C

Litmus Papers Reaction

Question 7:

Neutralization reaction is a

  1. Physical and reversible change.
  2. Physical change that cannot be reversed.
  3. Chemical and reversible change.
  4. Chemical change that cannot be reversed.

Answer: D

Neutralization Reaction