A gaseous reaction: $A_{2} (g) \to B (g) + \frac{1}{2} C (g)$ shows increase of pressure from $100 m m$ to $120 m m$ in $5 min$ . The rate of disappearance of $A_{2}$ is:

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Solution

The correct option is A 8
$A_{2} \to B + \frac{1}{2} C$
100 0 0
100-x x $\frac{1}{2} x$
$=> 100 + \frac{1}{2} x = 120$
$=> \frac{1}{2} x = 20 \Rightarrow x = 40$
Rate of disappearance of $A =$ $\frac{- d A}{d t}$
$=> \frac{100 - 60}{5} = 8 m m m i n^{- 1}$

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