Need the solution for 10th question

Dear student,
(a)  the gas formed by burning of Charcoal is Carbon di oxide ( CO2) , and on dissolving the gas in water it forms an acid carbonic acid which turns blue litmus to red indicates the acidic nature .
In another test this gas does not support the combustion or fire 
(b)  Carbon / Charcoal    +   Oxygen gas  →  Carbon di oxide 

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