Practical Chemistry — Practice Quiz
ICSE · Class 10 · Chemistry
Try a 4-question quiz on Practical Chemistry for ICSE Class 10 Chemistry: tap an answer to check it and see why. 44 questions in the full chapter test.
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Which gas turns moist red litmus paper blue?
What color flame is produced by calcium in the flame test?
Which reagent is used to test for carbonate ions?
What happens when zinc carbonate is heated?
Sample Questions
Which gases are evolved when copper nitrate is heated? (Select all correct answers)
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Nitrogen dioxide, Oxygen
When copper nitrate is heated, it decomposes to form copper oxide (black residue), nitrogen dioxide (brown gas), and oxygen gas according to: 2Cu(NO₃)₂ → 2CuO + 4NO₂ + O₂
Which test is used to confirm the presence of hydrogen gas?
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Burns with a pop sound
Hydrogen gas burns with a characteristic 'pop' sound when ignited. This is the confirmatory test for hydrogen gas: 2H₂ + O₂ → 2H₂O
Which ions can be identified by their reaction with sodium hydroxide solution? (Select all correct answers)
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Cu²⁺, Fe³⁺, Zn²⁺, NH₄⁺
All the cations listed (Cu²⁺, Fe³⁺, Zn²⁺, NH₄⁺) can be identified by their characteristic reactions with NaOH solution, forming colored precipitates or releasing gases. Chloride ion cannot be tested this way.
What color is the precipitate formed when copper ions react with sodium hydroxide?
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Pale blue
Cu²⁺ ions react with NaOH to form a pale blue precipitate of copper hydroxide Cu(OH)₂. This precipitate turns black on heating due to formation of CuO.
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