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can someone help me work out this question when calcium reacted with gas A a...

can someone help me work out this question
when calcium reacted with gas A a compound B is formed. The compound B reacts to give a gas C which turns red litmus paper to blue. ( a) identity A and B ( b ) write the equation for the reaction of : ( i ) calcium with A ( ii ) B with water
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Asked by olapeju on 17th January, 2018
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