Question

$P\left(g\right)+Q\left(g\right)+R\left(g\right)\to S\left(g\right)+T\left(g\right)$
The experimental rate law for this reaction is $K\left[P{]}^3\right[Q{]}^{-1}[R{]}^0$.
Which of the following statements is correct?

• A. Order of reaction with respect to Q is $-1$
• B. Overall order of reaction is $1$
• C. Order of reaction with respect to R is $1$
• D. Overall order of reaction is 3

Answer 1

The correct option is A Order of reaction with respect to Q is $-1$

Order of a reaction:
For a given reaction:
$aA+bB+cC\to \text{Products}$
If,
$\text{Rate}\propto \left[A{]}^p\right[B{]}^q[C{]}^r$
Overall order of the reaction is :
$(p+q+r)$
where,
p: order of reaction with respect to A
q: order of reaction with respect to B
r: order of reaction with respect to C

For,
$P\left(g\right)+Q\left(g\right)+R\left(g\right)\to S\left(g\right)+T\left(g\right)$

Rate is,
$R=K\left[P{]}^3\right[Q{]}^{-1}[R{]}^0$.
Thus, order of reactions is
$3+(-1)+0=2$

Also,
$\text{Order of reeaction with respect to P is 3}$
$\text{Order of reeaction with respect to Q is -1}$
$\text{Order of reeaction with respect to R is 0}$

Hence, the correct answer is option (a).