Answers

2015-05-06T21:01:33+05:30
 Brass is an alloy of Zn &Cu.
Brass is a mixture and not a compound because in compound the elements should be in definite proportions and the elements are chemically bonded to each other.
Whereas in brass the two elements Zn & Cu are not in definite proportions (they can mix in any ratio) & there is no chemical bonding between them.

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2015-05-07T09:05:01+05:30
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we know that brass is a combination of copper and zinc.but, it's not considered as a compound because:
1) it shows the properties of its constituents
2) it has variable composition
these properties satisfy a mixture but not a compound

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