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JAMB - Chemistry (1990 - No. 7)

Which of the following samples will react fastest with dilute trioxonitrate (V) acid?
5 g of lumps of CacO3 at 25°C
5 g of powered CacO3 at 25°
5 g of lumps of CaCO3 at 50°C
5 g of powered CaCO3 AT 50°C

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