Silver tarnishes due to (nitrogen oxides/hydrogen sulphide) in the air.
Silver tarnishes due to hydrogen sulphide in the air.
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- Name the gas in air which tarnishes silver articles slowly.
- Which metal becomes black in the presence of hydrogen sulphide gas in air?
- Silver metal does not combine easily with oxygen but silver jewellery tarnishes after some time. How?
- Silver articles become black on prolonged exposure to air. This is due to the formation ofAg3NAg2OAg2SAg2S and Ag3N
- What is the percentage of nitrogen in air?
- Which of the following raw materials is available in the air for photosynthesis?(a) Oxygen(b) Carbon dioxide(c) Nitrogen(d) Hydrogen
- Which of the following substances are elements ?Water, Salt, Mercury, Iron, Marble, Diamond, Wood, Nitrogen, Air, Graphite, Hydrogen, Oxygen, Sugar, Chlorine
- Translate the following statements into chemical equations and then balance them.(a) Hydrogen gas combines with nitrogen to form ammonia.(b) Hydrogen sulphide gas burns in air to give water and sulphur dioxide.(c) Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate.(d) Potassium metal reacts with water to give potassium hydroxide and hydrogen gas.
- Which of the following cannot be separated from air by the process of fractional distillation ?(a) oxygen (b) argon (c) hydrogen (d) nitrogen
- Give reasoni. Metals replace hydrogen from dilute acids, whereas non-metals do not.>ii. Carbonate and sulphide ores are usually converted into oxides during the process of extraction.
- Name one source and one harmful effect of each of the following air pollutants:(a) Sulphur dioxide(b) Nitrogen oxides(c) Carbon monoxide(d) Chlorofluorocarbons (CFCs)
- The correct increasing order of the boiling points of liquid oxygen, liquid argon and liquid nitrogen present in liquid air is :(a) nitrogen, oxygen, argon (b) nitrogen, argon, oxygen(c) argon, oxygen, nitrogen (d) oxygen, argon, nitrogen
- List five activities that are possible due to the presence of air.
- (a) Explain how, nitrogen, oxygen, and argon gases are separated from air.(b) Draw a flow diagram of the processes involved in obtaining gases like nitrogen, oxygen, and argon from the air.
- (a) Describe the threat to the Taj Mahal monument due to air pollution.(b) State any two ways of controlling air pollution.
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