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Q)

$xNO_2+yH_2O+O_2\rightarrow 4z$.The sum of $x+y=$

$(a)\;6\qquad(b)\;5\qquad(c)\;2\qquad(d)\;4$

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A)
$4NO_2+2H_2O+O_2\rightarrow 4HNO_3$
$x=4$
$y=2$
$x+y=4+2=6$
Hence (a) is the correct answer.
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