Observe the colour of the substance in the cold test tube
and note it.
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hello , this is not a correct question the question should we hydrogen + oxygen + nitrogen no nitrogen + nitric acid which what colour then we should prove that H2 + 2 + 3 + cl2 + is equal that gives H2 O3 twice and III oxide diluted substance it is a wrong question and answer ha ha
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You have given the wrong question please try again to give the proper question
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