True or False:
9m
a) Air can have a fixed chemical formula.
b) Air can be separated by liquefying nitrogen and oxygen gas.
c) Lime water turns milky if CO2 is passed through it.
d) The pollutants released during lightening discharge are SO2 & CO2
e) The formula of sulphuric acid is HNO3
f) Non- metallic oxide + water → Alkali
g) Metallic oxide + water → Acid
h) Sulphur dioxide + water vapour forms sulphurous acid [H2SO3]
i) Nitrogen dioxide + water forms nitrous acid and nitric acid
Answers
Answer:
- true
- false
- true
- true
- false
- false
- false
- true
- true
Explanation:
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Answer:
A) There is no chemical formula for air as it is a mixture of many compounds. The major components would be Nitrogen (N2), Oxygen (O2), Carbon Dioxide (CO2), Water (H2O), and many others in minute amounts. Nitrogen makes up 78.1% of air, while oxygen makes up 20.9% of air.
B) About 78 per cent of the air is nitrogen and 21 per cent is oxygen. These two gases can be separated by fractional distillation of liquid air.
C) When carbon dioxide is passed through lime water, it turns milky due to the formation of calcium carbonate. Calcium carbonate precipitates as a milky white precipitate.
D) FALSE
E) FALSE ITS H₂SO₄
F) Ionic metal oxides react with water to give hydroxides (compounds containing the OH− ion) and resultant basic solutions, whereas most nonmetal oxides react with water to form acids and resultant acidic solutions
G)METAL OXIDES
In accord with their basic behaviour, they react with acids in typical acid-base reactions to produce salts and water; for example, M2O + 2HCl → 2MCl + H2O (where M = group 1 metal). These reactions are also often called neutralization reactions.
H)TRUE
I)Nitrogen dioxide disproportionates into nitric acid and nitrous acid in aqueous solution: 2 NO2 + H2O → HNO3 + HNO. In warm or concentrated solutions, the overall reaction amounts to production of nitric acid, water, and nitric oxide: 3 HNO2 → HNO3 + 2 NO + H2O.
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