Question
The correct order of acidic strength is
A.
$${K_2}O > CaO > MgO$$
B.
$$C{O_2} > {N_2}{O_5} > S{O_3}$$
C.
$$N{a_2}O > MgO > A{l_2}{O_3}$$
D.
$$C{l_2}{O_7} > S{O_2} > {P_4}{O_{10}}$$
Answer :
$$C{l_2}{O_7} > S{O_2} > {P_4}{O_{10}}$$
Solution :
The species $$C{l_2}{O_7},S{O_2}$$ and $${P_4}{O_{10}}$$ are the anhydrides of $$HCl{O_4},{H_2}S{O_3}$$ and $${H_3}P{O_4}$$ respectively. The acid strength of these acids follows the order $$HCl{O_4} > {H_2}S{O_3} > {H_3}P{O_4}.$$ The corresponding anhydrides also followthe same order.