Class 10 Exercise Notes-Acid, Base-Salts

EXERCISE 

Very Short Answer Type Questions:

  1. How will you define acid?
  2. How will you define base?
  3. Give two examples of natural indicators?
  4. What is the colour of litmus paper when it is dipped in acidic solution?
  5. What is the colour of litmus paper when it is dipped in basic solution?
  6. What is the colour of phenolphthalein in acidic solution?
  7. What is the colour of phenolphthalein in alkaline solution?
  8. What is the colour of methyl orange in acidic solution?
  9. Name the organic acid which is present in vinegar.
  10. Name the inorganic acid which is present in a car battery.

ANSWERS

Very Short Answer Type Questions:

  1. Answer: Acid is a substance which tastes sour and turns blue litmus into the red.
  2. Answer: Base is a substance which tastes bitter and turns red litmus into the blue. A base feels soapy on touch.
  3. Answer: Litmus and China rose extract
  4. Answer: Red
  5. Answer: Blue
  6. Answer: Colourless
  7. Answer: Pink
  8. Answer: Red
  9. Answer: Acetic acid
  10. Answer: Sulphuric acid

Fill in the blanks:

  1. Litmus solution is …………in colour.
  2. Clove and vanilla are examples of ……………indicators.
  3. Methyl …………… is an example of a synthetic indicator.
  4. Zinc + Sulphuric acid →………….. + hydrogen
  5. Iron + …………….→ Iron chloride + Hydrogen
  6. Sodium carbonate + Hydrochloric acid → Sodium chloride + ………… + Water
  7. Sodium carbonate + ………….. → Sodium nitrate + Carbon dioxide + Water
  8. Acid + Base→ ………….. + Water
  9. Acetic acid + Sodium hydroxide→ ……………….. + Water
  10. ……………oxides are acidic in nature.

Answers:

Fill in the blanks:

  1. Answer: Mauve
  2. Answer: Olfactory
  3. Answer: Orange
  4. Answer: Zinc sulphate
  5. Answer: Hydrochloric acid
  6. Answer: Carbon dioxide
  7. Answer: Nitric acid
  8. Answer: Salt
  9. Answer: Sodium acetate
  10. Answer: Non-metallic

Write True/False for the following:

  1. The base turns blue litmus to red.
  2. Litmus is prepared from an extract of lichen.
  3. Olfactory indicators are very useful for visually challenged students.
  4. Blue litmus becomes red in presence of sodium hydroxide solution.
  5. Most of the metals do not react with bases.
  6. Calcium carbonate is an example of a base.
  7. Sodium chloride is an example of salt.

Answers:

Write True/False for the following:

Answer: 1 → F, 2→ T, 3 → T, 4 →F, 5 →T, 6 →F, 7 →T

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Back to Chapter




Chemical Reactions and Equations:

Types of Chemical Reaction:

Acids, Bases and Salts:

Common Properties of Acid and Base:

Metals and Non-metals:

Carbon and its Compounds:

Periodic Classification of Elements:

Life processes:

Control and co-ordination in animals and plants:

Reproduction:

Heredity and evolution: 

Conservation of natural resources:

How do Organism Reproduce

Electricity:

Magnetic effects of current:

Sources of energy:

Light

Human’s Eye and Colourful World