Question
Which of the following statements is incorrect?
A.
$$S{O_3}$$ is a stronger oxidising agent and more acidic than $$S{O_2}.$$
B.
Selenium forms only two oxoacids i.e.,selenous acid $$\left( {{H_2}Se{O_3}} \right)$$ and selenic acid $$\left( {{H_2}Se{O_4}} \right).$$
C.
The acidic strength and oxidising power of oxoacids is greater in + 6 oxidation state than in + 4 oxidation state.
D.
The thermal stability of oxides of group 16 elements decreases in the order : $$S{O_2} > Se{O_2} > Te{O_2} > Po{O_2}.$$
Answer :
The thermal stability of oxides of group 16 elements decreases in the order : $$S{O_2} > Se{O_2} > Te{O_2} > Po{O_2}.$$
Solution :
Thermal stability of the oxides of group 16 elements decreases in the order : $$S{O_2} > Te{O_2} > Se{O_2} > Po{O_2}.$$ $$Te{O_2}$$ decomposes at temperature $$ > 733{\,^ \circ }C$$ while $$Se{O_2}$$ has $$ \sim 600{\,^ \circ }C$$ as the decomposition temperature. $$Po{O_2}$$ decomposes at $$500{\,^ \circ }C.$$