why is hydrogen peroxide in the laboratory preparation is added dropwise through thistle funnel?
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Because it is highly corrosive and burns the hands when dropped continuously
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Laboratory preparation
Hydrogen peroxide is added dropwise through a thistle funnel. The decomposition of hydrogen peroxide in the presence of the catalyst manganese dioxide results in the formation of oxygen gas. The oxygen gas formed passes through the delivery tube and is collected by downward displacement of water.
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