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Question

Consider the figure below, in which the blue circles represent atoms of copper metal, atomic mass 63.5 amu, while the red circles represent atoms in zinc metal, atomic mass 65.4 amu.
Here are four statements concerning this system. Identify the correct statement or statements.
I. This is a single-phase mixture, with a copper-to-zinc atom ratio of 3:1.
II. This is two-phase mixture, with a copper-to-zinc atom ratio of 8:1.
III. The mixture is 80% copper, by mass.
IV. This mixture could be an alloy of copper and zinc.
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A
Statement I only.
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B
Statement II only.
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C
Statement I and III only.
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D
Statement I and IV only.
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Solution

The correct option is D Statement I and III only.
Here, no. of atoms of Cu=30 atoms
No. of atoms of Zn=10 atoms
Single phase mixture is a homogenous mixture with same proportions of atoms.
Here, the ratio of copper to zinc is 3:1
So, it is a two phase mixture.
% Cu by mass =3×63.53×63.5+65.4=190.5255.9=0.744×100=74%80% by mass
The mixture can be alloy of zinc.

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