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Q.

A copper plate of 20cm × 10cm is to be plated with silver of 1 mm thickness.  The number of silver atoms required for the plating is (density of silver = 10.8 g/c.c)

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a

1.2×1024

b

2.4×1024

c

1.2×1013

d

2.4×1023

answer is A.

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Detailed Solution

Volume of copper plate  =20×10×0.1 cm3=20cm3

d=mv

∴  mass of copper = d × V

=10.8×20

= 216 gms

Number of silver atoms  =216×6×1023108=1.2×1024 atom

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