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Acids, Bases and Salts (Class VII)

Acid Base and Salts

15 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

The sharp pain caused by the sting of brown ants, nettles and bees is due to

  1. citric acid
  2. tartartic acid
  3. formic acid
  4. lactic acid
  5. malic acid
Question 2 Multiple Choice (Single Answer)

Which of the following is a mineral acid?

  1. Malic acid
  2. Nitric acid
  3. Oxalic acid
  4. Citric acid
  5. Acetic acid
Question 3 Multiple Choice (Single Answer)

Which of the following acids helps in the growth, development and repair of the body cells?

  1. Deoxyribonucleic acid
  2. Lactic acid
  3. Amino acid
  4. Formic acid
  5. Oxalic acid
Question 4 Multiple Choice (Single Answer)

Which of the following bases changes the colour of turmeric stain from yellow to brownish red?

  1. Sodium hydroxide
  2. Calcium hydroxide
  3. Magnesium hydroxide
  4. Potassium hydroxide
  5. Ammonium hydroxide
Question 5 Multiple Choice (Single Answer)

In a solution, if used as an indicator, the colour of china rose petals changes to green. Which of the following is the solution?

  1. Baking soda solution
  2. Common salt solution
  3. Aerated water
  4. Lemon juice solution
  5. Hydrochloric acid solution
Question 6 Multiple Choice (Single Answer)

Match the following:

 
a. Acid 1. It is a substance that has a soapy touch, bitter taste and turns red litmus blue.
b. Base 2. It is a complex naturally-occurring substance that changes its colour on coming in contact with other substances.
c. Indicator 3. It is a substance that has a sour taste and turns blue litmus red.
  1. a - 3, b - 2, c - 1
  2. a - 3, b - 1, c - 2
  3. a - 1, b - 3, c - 2
  4. a - 1, b - 2, c - 3
  5. a - 2, b - 1, c - 3
Question 7 Multiple Choice (Single Answer)

Which of the following is not a property of acids?

  1. Acids have a sour taste.
  2. All acid solutions are good conductors of electricity.
  3. They turn blue litmus solution red.
  4. Most of the acids are insoluble in water.
  5. Mineral acids are highly corrosive.
Question 8 Multiple Choice (Single Answer)

When a few drops of colourless phenolphthalein solution were added to a solution, the colour of the indicator changed to deep pink. Which of the following is the solution?

  1. Shampoo solution
  2. Hydrochloric acid solution
  3. Nitric acid solution
  4. Lemon juice solution
  5. Common salt solution
Question 9 Multiple Choice (Single Answer)

Which of the following statements is/are false?

a. The solution of litmus in distilled water is mauve in colour.
b. Distilled water and alcohol solution are a few examples of neutral substances.
c. A solution of common salt that has no effect on red litmus paper is basic in nature.

  1. Only a
  2. Only a and b
  3. Only b
  4. Only b and c
  5. Only c
Question 10 Multiple Choice (Single Answer)

To relieve indigestion, doctors prescribe antacid tablets. Among other things, they contain

  1. hydrochloric acid
  2. nitric acid
  3. calcium hydroxide
  4. phosphoric acid
  5. magnesium hydroxide
Question 11 Multiple Choice (Single Answer)

Match the following:

</strong
Name Chemical formula Found in
a. Sodium hydroxide 1. Mg(OH)2 p. Limewater
b. Calcium hydroxide 2. NaOH q. Milk of magnesia
c. Magnesium hydroxide 3. Ca(OH)2 r. Soap
  1. a - 2 - r, b - 3 - p, c - 1 - q
  2. a - 2 - r, b - 3 - q, c - 1 - p
  3. c - 2 - r, a - 3 - p, b - 1 - q
  4. a - 2 - p, b - 3 - r, c - 1 - q
  5. a - 2 - q, b - 3 - p, c - 1 - r
Question 12 Multiple Choice (Single Answer)

Which of the following is not an indicator?

  1. Turmeric
  2. Litmus solution
  3. Phenolphthalein solution
  4. China rose solution
  5. Baking soda solution
Question 13 Multiple Choice (Single Answer)

Match the following:

</strong
Substances Taste
a. Tamarind 1. Sour
b. Baking soda solution 2. Sweet
c. Sugar solution 3. Bitter
  1. a - 2, b - 3, c - 1
  2. a - 3, b - 2, c - 1
  3. a - 3, b - 1, c - 2
  4. a - 1, b - 3, c - 2
  5. a - 1, b - 2, c - 3
Question 14 Multiple Choice (Single Answer)

Which of the following indicators identify only the basic solutions, whereas their colour does not change in acidic and neutral solutions?

a. Turmeric
b. Phenolphthalein
c. Litmus solution
d. China rose petals

  1. Only a and d
  2. Only b and c
  3. Only a and b
  4. Only a and c
  5. Only b and d
Question 15 Multiple Choice (Single Answer)

Match the following:

</strong
Acid Source
a. Tartartic acid 1. Proteins
b. Lactic acid 2. Grapes and goose berries
c. Amino acid 3. Sour milk
  1. a - 2, b - 1, c - 3
  2. a - 1, b - 2, c - 3
  3. a - 2, b - 3, c - 1
  4. a - 3, b - 2, c - 1
  5. a - 1, b - 3, c - 2
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