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| The gas 'G' will show which of the following properties |
A) turn lead-acetate filter paper black
B) turn acidified \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] filter paper green
C) decolourise the pink colour of \[N{{a}_{2}}C{{O}_{3}}a\,(aq.)\]to which few drops of phenolphthalein have been added
D) all the above
Correct Answer: A
Solution :
The gas evolved will be \[{{H}_{2}}S.\]
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