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Karnataka SSLC (Class 10) Acids, Bases and Salts — practice questions

Explore 17 free Acids, Bases and Salts questions in Karnataka SSLC (Class 10) Science. Open each question or exercise to read its content, reference answers and available explanation.

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Acids, Bases and Salts questions and exercises with answers

Showing questions 1–17 of 17.

Acids turnRead the answer and worked solution →Which of these is a natural indicator?Read the answer and worked solution →When a metal reacts with a dilute acid, the gas produced isRead the answer and worked solution →Onion and clove, which can distinguish acids from bases by smell, are examples ofRead the answer and worked solution →A metal carbonate reacting with a dilute acid gives a salt, water andRead the answer and worked solution →The reaction of an acid with a base to give a salt and water is calledRead the answer and worked solution →Acids show acidic behaviour in aqueous solution because they produceRead the answer and worked solution →On the pH scale, a solution with pH = 7 isRead the answer and worked solution →Bases that are soluble in water are calledRead the answer and worked solution →Which oxide is basic in nature?Read the answer and worked solution →Bleaching powder is produced by the action of chlorine onRead the answer and worked solution →Baking soda has the chemical formulaRead the answer and worked solution →Plaster of Paris is obtained by heating gypsum to about 100°C and has the formulaRead the answer and worked solution →The blue colour of copper sulphate crystals ($CuSO_4\cdot 5H_2O$) is due toRead the answer and worked solution →Common salt (NaCl) is the raw material for the chlor-alkali process, which produces sodium hydroxide, hydrogen andRead the answer and worked solution →Tooth decay begins when the pH of the mouth falls below aboutRead the answer and worked solution →Drop each trait into acid or baseRead the answer and worked solution →

Worked practice questions

Acids turn

  1. red litmus blue
  2. both litmus papers black
  3. blue litmus red
  4. phenolphthalein pink
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Correct answer: C. blue litmus red

1. Litmus is a natural acid-base indicator. 2. **Acids turn blue litmus red**; they leave red litmus unchanged. 3. Bases do the opposite (red → blue). _Source: Karnataka SSLC (KSEEB) Class 10 Science, Ch2 'Acids, Bases and Salts', §2.1_

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Which of these is a natural indicator?

  1. methyl orange
  2. phenolphthalein
  3. universal indicator
  4. litmus
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Correct answer: D. litmus

1. Natural indicators are obtained from plants. 2. **Litmus** (from lichen) and turmeric are natural indicators. 3. Methyl orange and phenolphthalein are synthetic indicators. _Source: Karnataka SSLC (KSEEB) Class 10 Science, Ch2 'Acids, Bases and Salts', §2.1_

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When a metal reacts with a dilute acid, the gas produced is

  1. hydrogen
  2. oxygen
  3. carbon dioxide
  4. nitrogen
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Correct answer: A. hydrogen

1. Metal + dilute acid → salt + hydrogen gas. 2. The gas is **hydrogen**, which burns with a 'pop' sound when a lit splinter is brought near. 3. e.g. Zn + H₂SO₄ → ZnSO₄ + H₂. _Source: Karnataka SSLC (KSEEB) Class 10 Science, Ch2 'Acids, Bases and Salts', §2.2_

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