Answer: Hydrochloric acid reacts with sodium carbonate to produce sodium chloride, carbon dioxide and water. Na2CO3 + 2HCl = 2NaCl + CO2 ↑ + H2O
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Answer: When dilute HCI is placed in an aluminium container, aluminium reacts with dilute HCl to produce aluminium chloride and hydrogen gas. So putting dilute HCl in an aluminium container corrodes the container. 2Al+6HCI = 2AlCl3 + 3H2 ↑
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What happens when HCI reacts with ammonia? Answer: The reaction of HCl with ammonia gas produces white fumes of ammonium chloride. NH3 + HCl = NH4Cl
Answer: When MnO2 is mixed with concentrated HCl and heated, HCl oxidizes to greenish-yellow chlorine gas and MnO2 oxidizes to manganese chloride. MnO2 + 4HCl = MnCl2 + Cl2 ↑ + 2H2O
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What happens when HCI is poured into the silver nitrate solution? Answer: The addition of HCl to silver nitrate solution precipitates a white insoluble silver chloride. AgNO3 + HCl = AgCl ↓ + HNO3
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What happens when we add dilute HCI to calcium carbonate? Answer: The reaction of dilute HCl with calcium carbonate (marble) produces calcium chloride and carbon dioxide. CaCO3 + 2HCl = CaCl2 + CO2 ↑ + H2O
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Answer: Sources of Sulfur Dioxide How does Sulfur Dioxide Pollution occur? SO2 gas reacts with atmospheric oxygen, water vapour etc. to form sulfuric acid. Sulfuric acid is strongly acidic in nature and harmful to living organisms. It comes down to the surface through acid rain and causes damage. Harmful Effects of Sulfur Dioxide Pollution (i)
One bottle contains NaOH solution, another contains dilute H2SO4 and the third contains NaCl solution. How can you tell what’s in a bottle with just litmus paper? Answer: The solution was taken from each bottle and placed in three test tubes separately. The litmus paper was cut into three pieces and placed into the solution
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What happens when the copper powder is boiled with concentrated nitric acid? Answer: Boiling copper powder with concentrated nitric acid produces cupric oxide, nitrogen and water. 5Cu + 2HNO3 = 5CuO + N2 ↑ + H2O
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What happens when Concentrated HNO3 is dropped onto the heated rock? Answer: Dropping concentrated HNO3 onto heated bedrock causes the HNO3 to dissociate to produce nitrogen dioxide, oxygen and water vapour. 4HNO3 = 4NO2 ↑ + 2H2O ↑ + O2 ↑
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