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How many of the following can act as neg...

How many of the following can act as negative healist for in the decomposion of `H_(2)O_(2)` urca, metals. sunlight, dust particles, glass, alkali, phosporic acid, acetanilide, sodium stannate, sandis Urea, Alkali. Phosporic acid, Acetanilide, Sodium stannate.

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Urea, Alkali , Phosporic acid, Acetanilide, Sodium stannate.
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