Practical Work
ICSE · Class 9 · Chemistry
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See them allHow is hydrogen gas prepared in the laboratory?
Answer
Hydrogen is prepared by reacting a reactive metal with dilute acid. Balanced equation: Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g). Observation: a colourless, odourless gas is formed. It burns with a pale bl…
How is hydrogen gas identified?
Answer
Hydrogen is a neutral gas. Test 1: Pure hydrogen burns with a pale blue flame. Test 2: Hydrogen mixed with air gives a pop sound near a burning taper. This pop test is the confirmatory test for hydrog…
How is oxygen gas prepared from a heavy metallic oxide?
Answer
Oxygen is prepared by heating heavy metallic oxides. Example: 2PbO2(s) → 2PbO(s) + O2(g). Other oxygen-producing substances on heating include Pb3O4, HgO, KNO3, and NaNO3. Oxygen is a colourless, odou…
How is oxygen gas identified?
Answer
Oxygen rekindles a glowing splinter. It is also absorbed in colourless alkaline solution of pyrogallol and turns it dark brown. These tests show that oxygen supports combustion.
How is carbon dioxide prepared from a carbonate?
Answer
Carbon dioxide is prepared by heating a carbonate or by adding dilute acid to a carbonate. Balanced equation: CaCO3(s) + 2HCl(aq) → CaCl2(aq) + H2O(l) + CO2(g). Carbon dioxide is a colourless, odourle…
How is carbon dioxide identified?
Answer
Carbon dioxide turns lime water milky. Equation: Ca(OH)2(aq) + CO2(g) → CaCO3(s) + H2O(l). If carbon dioxide is passed in excess, the milkiness disappears: CaCO3(s) + CO2(g) + H2O(l) → Ca(HCO3)2(aq).
How can carbon dioxide and sulphur dioxide be distinguished?
Answer
Both gases can turn lime water milky, so lime water is not enough. Sulphur dioxide decolourizes acidified KMnO4 and changes acidified K2Cr2O7 from orange/yellow to green. Carbon dioxide has no effect …
How is chlorine gas prepared?
Answer
Chlorine is prepared by reacting concentrated hydrochloric acid with an oxidizing agent such as manganese dioxide. Balanced equation: MnO2(s) + 4HCl(aq) → MnCl2(aq) + 2H2O(l) + Cl2(g). Chlorine is a g…
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