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$xNO_2+yH_2O+O_2\rightarrow 4z$.The $y$ is

$(a)\;2\qquad(b)\;1\qquad(c)\;3\qquad(d)\;4$

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$4NO_2+2H_2O+O_2\rightarrow 4HNO_3$
Hence y is 2.
Hence (a) is the correct answer.
answered Jan 22, 2014 by sreemathi.v
 

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