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Questions  

Arrange the following in the order of increasing mass. (Atomic mass of O=16u,  Cu=63u,  N=14u )

I) One atom of oxygen    II) one atom of nitrogen    III)  1×1010  mole of oxygen gas    IV) 1×1010 mole of copper

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a
II<I<III<IV
b
I<II<III<IV
c
III<II<IV<I
d
IV<II<III<I

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detailed solution

Correct option is A

Single atom of nitrogen has the mass 14 u but single atom of oxygen has 16u as mass. Hence, II < I. In the similar way, 1×1010 mol of copper has greater atomic mass than 1×1010 mol of oxygen. Hence, III  < IV.

Therefore, overall increasing order of atomic mass is II<I<III<IV

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