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NDA Calorimetry — practice questions

Explore 12 free Calorimetry questions in NDA Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Calorimetry questions and exercises with answers

Showing questions 1–12 of 12.

All acids in aqueous solution release:Read the answer and worked solution →When a carbonate reacts with an acid, the gas evolved is:Read the answer and worked solution →An indicator that turns RED in acidic solution and BLUE in basic solution is:Read the answer and worked solution →Acid + Base → Salt + Water is called:Read the answer and worked solution →The chemical name of common salt (used in cooking) is:Read the answer and worked solution →Bleaching powder used in disinfection of water has the formula:Read the answer and worked solution →Baking soda (sodium hydrogen carbonate) has the formula:Read the answer and worked solution →Washing soda is sodium carbonate decahydrate, formula:Read the answer and worked solution →When an acid reacts with a metal, the gas usually evolved is:Read the answer and worked solution →Plaster of Paris (POP) has the formula:Read the answer and worked solution →An acid that is also a strong dehydrating agent and is used in car batteries is:Read the answer and worked solution →Tap every solution that is acidicRead the answer and worked solution →

Worked practice questions

All acids in aqueous solution release:

  1. Hydroxide ions (OH⁻)
  2. Hydronium ions (H₃O⁺)
  3. Sodium ions (Na⁺)
  4. Chloride ions (Cl⁻)
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Correct answer: B. Hydronium ions (H₃O⁺)

1. Acid in water: HA + H₂O → A⁻ + H₃O⁺. 2. The hydronium ion H₃O⁺ is responsible for the sour taste and characteristic acid behaviour. 3. Bases release OH⁻ instead. _Source: syllabus Science Ch 2 §2.1 Acids and Bases in Water_

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When a carbonate reacts with an acid, the gas evolved is:

  1. Hydrogen
  2. Oxygen
  3. Carbon dioxide
  4. Nitrogen
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Correct answer: C. Carbon dioxide

1. Carbonate (or bicarbonate) + acid → salt + water + CO₂. 2. Na₂CO₃ + 2 HCl → 2 NaCl + H₂O + CO₂↑. 3. CO₂ turns lime water (Ca(OH)₂) MILKY — diagnostic test. _Source: syllabus Science Ch 2 §2.1.2 Acids with Carbonates_

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An indicator that turns RED in acidic solution and BLUE in basic solution is:

  1. Methyl orange
  2. Phenolphthalein
  3. Litmus
  4. Universal indicator
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Correct answer: C. Litmus

1. Litmus is the classic red↔blue indicator. 2. Red litmus turns blue in BASE; blue litmus turns red in ACID. 3. Phenolphthalein is colourless in acid, PINK in base. 4. Methyl orange is red in acid and yellow in base. _Source: syllabus Science Ch 2 §2.1.1 Indicators_

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