MCQ
For the equilibrium $A \rightleftharpoons$ $B$ , the variation of the rate of the forward $(a)$ and reverse $(b)$ reaction with time is given by
- A

- B

- ✓

- D






$r_{a}=r_{b}$
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$I :$ The three elements are metals.
$II :$ The electro negativities decrease from $X$ to $Y$ to $Z$.
$III :$ The atomic radius decreases in the order $X, Y$ and $Z.$
$IV : X, Y$ and $Z$ could be phosphorus, aluminium and sodium respectively.