Chemistry
State the original colour of the following substances and colour of residue obtained after heating.
(a) ammonium dichromate
(b) copper carbonate
(c) lead nitrate
(d) zinc carbonate
Practical Chemistry
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Answer
| S. No. | Salt | Original colour | Residue after heating |
|---|---|---|---|
| (a) | ammonium dichromate | Orange solid | Green solid |
| (b) | copper carbonate | Green solid | Black solid |
| (c) | lead nitrate | White solid | Yellow solid |
| (d) | zinc carbonate | White solid | Yellow when hot, white when cold |
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Carbon dioxide and sulphur dioxide gas can be distinguished by using :
(a) moist blue litmus paper
(b) lime water
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(d) none of the above
Assertion (A): Chlorine turns moist blue litmus red and finally decolourises it.
Reason (R): Chlorine is acidic in nature and an oxidising agent.
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- A is false but R is true.