Discussion
Heated saw dust catches fire when a drop of concentrated nitric acid is added to it. This is due to
Answer: B
The sawdust catches fire because concentrated nitric acid is a powerful oxidising agent.
It oxidises the cellulose rapidly, and the heat evolved is enough to raise the wood above its ignition temperature. Concentrated sulphuric acid, by contrast, chars sugar and wood by dehydration, leaving black carbon rather than setting it alight.
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