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Acids and Bases. Science - Acids and Bases.

Tamil Nadu Board - STD 8 - Science (Tamil - English Medium). 92 questions in this chapter.

Question types

Acids and Bases. question types

92 questions across 9 question groups — pick any mix to generate a Science paper with step-by-step answer keys.

92
Questions
9
Question groups
5
Question types
Sample Questions

Acids and Bases. questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1M C Q1 Mark
A salt may be ………………
  • A
    acidic only
  • B
    basic only
  • C
    neutral only
  • ✓
    acidic, basic or neutral

Answer: D.

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Q 2M C Q1 Mark
Lemon juice will turn ……………….
  • A
    phenolphthalein pink
  • B
    red litmus blue
  • C
    turmeric indicator red
  • ✓
    methyl orange red

Answer: D.

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Q 3M C Q1 Mark
Acids and bases can be identified in the laboratory by ………………
  • ✓
    an indicator
  • B
     tasting
  • C
    touching
  • D
    smelling

Answer: A.

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Q 4M C Q1 Mark
Add few drops of hibiscus indicator in soap solution. What do you observe?
  • ✓
    It turns green
  • B
    It turns magenta
  • C
    It turns yellow
  • D
    It turns red

Answer: A.

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Q 5M C Q1 Mark
The common salt is ………………
  • A
    sodium carbonate
  • B
    sodium bicarbonate
  • C
    sodium nitrate
  • ✓
    sodium chloride

Answer: D.

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Q 16Assertion & Reason1 Mark
Assertion: Methyl orange and phenolphthalein are natural indicators.
Reason: Methyl orange is yellow in colour while phenolphthalein is pink.
  • A
    Both assertion and reason are true and the reason is the correct explanation of assertion.
  • B
    Both assertion and reason are true, but reason is not the correct explanation of assertion.
  • C
    The assertion is true, but reason is false.
  • ✓
    Both assertion and reason are false.

Answer: D.

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Q 17Assertion & Reason1 Mark
Assertion: With some samples of acids and bases, turmeric paper turns red.
Reason: Such samples are acidic in nature.
  • A
    Both assertion and reason are true and the reason is the correct explanation of assertion.
  • B
    Both assertion and reason are true, but reason is not the correct explanation of assertion.
  • ✓
    The assertion is true, but reason is false.
  • D
    The assertion is false, but reason is true.

Answer: C.

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Q 18Assertion & Reason1 Mark
Assertion: A salt is produced when an acid is neutralised by a base.
Reason: A salt can be acidic, basic or neutral.
  • A
    Both assertion and reason are true and the reason is the correct explanation of assertion.
  • ✓
    Both assertion and reason are true, but reason is not the correct explanation of assertion.
  • C
    The assertion is true, but reason is false.
  • D
    The assertion is false, but reason is true.

Answer: B.

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Q 19Assertion & Reason1 Mark
Assertion: To neutralise the excess acid formed in the stomach, milk of magnesia is taken.
Reason: Milk of magnesia contains a base called magnesium hydroxide.
  • ✓
    Both assertion and reason are true and the reason is the correct explanation of assertion.
  • B
    Both assertion and reason are true, but reason is not the correct explanation of assertion.
  • C
    The assertion is true, but reason is false.
  • D
    The assertion is false, but reason is true.

Answer: A.

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Q 38[7 marks Questions]7 Marks
Crossword puzzle :
Across:
1. The acid found in apples.
3. The ion formed when an acid is dissolved in water.
5. An indicator that remains colourless in an acid.
7. The gas liberated when dilute hydrochloric acid reacts with limestone.
9. A gas that dissolved in water to form ammonium hydroxide.

Down:
2. An acid used for cooking.
4. An acid that has three hydrogen atoms in its moelcule.
6. A reaction in which an acid reacts w’ith a base to form salt and water only.
8. A base that is soluble in water.
10. The chemical name of this compound is calcium hydroxide.
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