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a
Suddenly cooling molten zinc
b
Adding molten zinc to water
c
Heating zinc to 150oC
d
Dropping molten zinc drop by drop
answer is B.
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Detailed Solution
Granulated zinc can be prepared by adding molten zinc on to cold water. However, when molten zinc is added to cold water, the zinc moves about and forms granules, however, no chemical reaction is observed. On the other hand, zinc can react with steam to produce zinc oxide.