What happens when dilute HCl is added to the aluminium vessel? Answer: Aluminium reacts with dilute HCl to produce aluminium chloride and hydrogen gas. That is why the aluminium container gets corroded. 2Al + 6HCl = 2AlCl3 + 3H2 ↑
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What happens when Aluminium is heated with a caustic soda solution? Answer: Heating aluminium with a caustic soda solution produces sodium aluminate salt and hydrogen gas. 2Al + 2NaOH + 2H2O = 2NaAlO2 + 3H2 ↑
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What happens when Aluminium powder is added to boiling water? Answer: The reaction of aluminium powder with boiling water produces aluminium hydroxide and hydrogen gas. 2Al + 6H2O = 2Al(OH)3 + 3H2 ↑
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What happens when slaked lime is mixed with ammonium chloride and heated? Answer: Heating slaked lime with ammonium chloride produces calcium chloride, water and ammonia gas. 2NH4Cl + Ca(OH)2 = 2NH3 ↑ + CaCl2 + 2H2O
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What happens when ammonia gas is passed over heated cupric oxide? Answer: When ammonia gas is passed over heated cupric oxide, the ammonia reduces the cupric oxide to copper and is itself oxidized to nitrogen. 3CuO + 2NH3 = 3Cu + 3H2O + N2 ↑
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What happens when dilute hydrochloric acid is reacted with the marble? Answer: Dilute hydrochloric acid reacts with marble stone ie calcium carbonate to produce calcium chloride, carbon dioxide and water. CaCO3 + 2HCl = CaCl2 + CO2 ↑ + H2O
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What happens when hydrogen sulphide is treated with a cupric chloride solution mixed with dilute hydrochloric acid? Answer: When hydrogen sulphide is treated with a cupric chloride solution containing dilute hydrochloric acid, black cupric sulphide is precipitated and hydrochloric acid is produced. CuCl2 + H2S = CuS ↓ + 2HCl
What happens when hydrogen sulphide gas is driven into a dilute acid solution of cupric sulphate? Answer: Conducting hydrogen sulphide in a weak acid solution of cupric sulphate produces precipitation of the black-coloured cupric sulphide and sulfuric acid is produced. CuSO4 + H2S = CuS ↓ + H2SO4
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What happens when oxygen is passed through a ferrous sulfate solution containing dilute sulfuric acid? Answer: When oxygen is passed through a solution of light green ferrous sulfate in dilute sulfuric acid, the ferrous sulfate is oxidized to light brown ferric sulfate. 4FeSO4 + 2H2SO4 + O2 = 2Fe2(SO4)3 + 2H2O
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What happens when water reacts with ammonia? Answer: When water reacts with ammonia, the ammonia dissolves in the water to produce ammonium hydroxide. NH3 + H2O = NH4OH
