Subject :NSO Class : Class 6
Rima found that the copper vessels in her house have lost their shine and become dull in appearance. What reason would you give Rima for this?
(I) Some metals lose their shine because of the action of air.
(II) Some metals lose their shine because of the action of moisture on them.
A(I) only
B(II) only
CBoth (I) and (II)
DNone of these