Q.

A colourless gas which burns with blue flame and reduces CuO to Cu is:

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a

N2

b

CO

c

CO2

d

NO2

answer is B.

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Detailed Solution

CO buns with blue flame and also acts as reducing agent and is used in the extraction of various metal from their oxide ores.
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A colourless gas which burns with blue flame and reduces CuO to Cu is: