Identify the following substance:
A brown gas D with the irritating smell.
A brown gas D with the irritating smell.
64 questions across 5 question groups — pick any mix to generate a CHEMISTRY paper with step-by-step answer keys.
[1 Mark Question Answer]
17 Q→02[2 Mark Question Answer]
28 Q→03[3 Mark Question Answer]
15 Q→04[5 Mark Question Answer]
2 Q→05Match The Following.
2 Q→One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
| Carbonate | Colour of residue on cooling |
| Zinc Carbonate | |
| Lead Carbonate | |
| Copper Carbonate |
| Column A | Column B |
| (a) Blue salt changes to white and then black | (i) Ammonium dichromate |
| (b) Orange coloured compound changes to green. | (ii) Iodine |
| (c) Red compound changes to brown and then yellow. | (iii) Zinc Nitrate |
| (d) White to yellow when hot and white when cold. | (iv) Copper sulphate |
| (e) Violet solid changes to violet vapours. | (v) Red Lead |
| Hydrogen sulphide | Ammonia | Sulphur dioxide | Hydrogen chloride | |
| Shake the gas with red litmus solution | ||||
| Shake the gas with blue litmus solution | ||||
| Apply a burning splint to a gas |
| Column A | Column B |
| (a) $NO_2$ | (i) supports combustion |
| (b) $O_2$ | (ii) rotten eggs smell |
| (c) $H_2$ | (iii) brown gas |
| (d) $H_2S$ | (iv) burns with a pop sound |
| Column A | Column B |
| (a) $Pb(NO_3)_2$ | (i) residue swells up |
| (b) $CO_2$ | (ii) fumes with $NH_3$ solution |
| (c) $(NH_4)_2Cr_2O_7$ | (iii) crackling sound |
| (d) $HCI$ | (iv) lime water turns milky |
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