Question

Which of the following is incorrect for degree of dissociation $\left(\alpha \right)$ ?

• A. The value of $\alpha$ can be any value from 0 to 1
• B. $\alpha$ can be a fractional value
• C. $\alpha$ has no units
• D. None of the above

Answer 1

The correct option is D None of the above

$\alpha =$Fraction of moles of the reactant that undergoes dissociation to form the products.
$\alpha$ can be any value from 0 to 1.
0 indicates no dissociation and 1 indicates complete dissociation.
Since degree of dissociation is the ratio of number of moles dissociated to the original moles i.e. $\frac{mol}{mol}$ ratio. Hence, it is unitless.
Eg: if $\alpha =\frac{1}{2}$, it means 50 % dissociation. Hence, $\alpha$ can be any fractional value between 0 to 1.