Question

Consider the reaction $2A\left(g\right)\to 3B\left(g\right)+C\left(g\right)$. Starting with pure $A$ initially, the total pressure is doubled in 3 hrs. The order of the reaction might be:

• A. zero
• B. first
• C. second
• D. unpredictable from this data

Answer 1

The correct option is D unpredictable from this data

$2A\left(g\right)⟶3B\left(g\right)+C\left(g\right)$

at time $t$, $1-2p$ $3p$ $p$

$\therefore$ total pressure in $3$ hrs $=1-2p+3p+p=1+2p$

Since the initial pressure is not given here. The order of the reaction is unpredictable.

$\therefore$ Answer will be D.