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250 gms of Zn (65.5) gave 242 gms of ZnO on ignition. Calculate %age yield of the reaction.

Sand is poured at the rate of 10 m cube /min so as to form a conical pile whose altitude is always equal to the radius of its base a) How fast is the radius increasing when it is 5 meters? b) Find the rate at which the area of its base is increasing when...

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so sir reiny the answer i got in your solution is a.0.4 m/min b.4 m/min that is right?