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Explain charring action of concentrated ...

Explain charring action of concentrated sulphuric acid on carbohydrate. Give the equation.
(ii) Complete the equation :
`2PbO_(2)(s)overset(Delta)rarr "……………. + ………………"`

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(i) Concentrated sulphuric acid is a strong dehydrating agent, it removes water from carbohydrate to form carbon.
`C_(12)H_(22)O_(11) overset(H_(2)SO_(4))rarr 12C+11H_(2)O`
(ii) `2PbO_(2)(s)overset(Delta)rarr 2PbO(s)+O_(2)(g)`.
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