Answer:
(a) In
photosynthesis, \[{{O}_{2}}\] is released from water, not from carbon dioxide.
It was confirmed by radioactive tracer technique. The mechanism may be given
as:
\[6C{{O}_{2}}(g)+6{{H}_{2}}{{O}^{*}}6{{H}_{2}}O\to {{C}_{6}}{{H}_{12}}{{O}_{6}}(aq)\]
\[+6{{H}_{2}}O(l)+6O_{2}^{*}\]
(b) Mechanism of this reaction may be given as,
\[\begin{align}
& {{O}_{3}}(g)\to {{O}_{2}}(g)+O(g) \\
& {{H}_{2}}{{O}_{2}}+O(g){{H}_{2}}O(l)+{{O}_{2}}(g) \\
& \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_
\\
& \frac{{{H}_{2}}{{O}_{2}}(l)+{{O}_{3}}(g)\to
{{H}_{2}}O(l)+{{O}_{2}}(g)+{{O}_{2}}(g)}{{}} \\
\end{align}\]
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