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Rearrange the following (I to IV) in the...

Rearrange the following (I to IV) in the order of increasin masses and choose the correct answer from (A), (B), (C) and (D)
(At. Mass N=14, O=16, Cu=63)
(I) 1 molecule of O
(II) 1 atom of nitrogen
(III) `1xx10^(-10)`g molecular mass of oxygen
(IV) `1xx10^(-7)` atomic mass of copper.

A

`(II) lt (I) lt (III) lt (IV)`

B

`(IV) lt (III) lt (II) lt (I)`

C

`(II) lt (III) lt (I) lt (IV)`

D

`(III) lt (IV) lt (I) lt (II)`

Text Solution

Verified by Experts

The correct Answer is:
A
(i) Molecule of `O_(2) = (32)/(6.02 xx 10^(23)) = 0.5 xx 10^(-23) gm`
(ii) One atom of `N = (14)/(6.02 xx 10^(23)) = 2.3 xx 10^(-23) gm`
(iii) `10^(-10)` gm mol wt. of oxyen `= 10^(-10) xx 32 = 3.2 xx 10^(-9) gm`
(iv) `10^(-10)` gm atom of copper `= 10^(-10) xx 63 = 6.3 xx 10^(-9) gm`
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