. A student notices that a new hammer made of iron is shiny while an old one kept in the toolbox for long has a reddish-brown powder deposit over it. What does the change in color of the hammer indicate?
a) effect of moisture on metals
b) iron hammer turns brown after some time
c) effects of kept in a box for a longer duration
d) iron changes color when kept with other tools
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(a) effect of moisture on metals
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Answer:
a) Effect of moisture on metals
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