Question

Assign T/F to the following statements.
1: The frequency factor has the same unit as the rate constant $k$
2: A plot $\ell n C$ for the nth order reaction gives a straight line with slope $-n$ and intercept $k_{n}$
3: The order of a reaction $A \rightarrow$ product in which half the reagent is reacted in half an hour, three quarters in one hour and seven - eighth in one and half hours must be 1 (unity).
4: The unit of rate constant for a second order reaction will be $M ^{-1} s ^{-1} .$ (M is representing the molarity of solution)

• A. T F T T
• B. T T T T
• C. F F T T
• D. T F F T

Answer 1

Answer: (A)

1 . $ k = Ae ^{- Ea/RT }$

2. rate $= k _{n}[ C ]^{ n }$

$\Rightarrow $ ln rate $=\ln k _{ n }+ n \ln C$

3. $A \rightarrow$ product

$a \stackrel{\frac{1}{2} h r}{\longrightarrow } \frac{a}{2} \stackrel{\frac{1}{2} h r}{\longrightarrow } \frac{a}{4} \stackrel{\frac{1}{2} h r}{\longrightarrow } \frac{a}{8}$

$\Rightarrow 1^{\text {st }}$ order reaction.