NCERT Exemplar IX — task. Science CBSE, Class 10.

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$2$ mL each of concentrated

$HCl$ ,

$HNO_3$ and a mixture of concentrated

$HCl$ and concentrated

$HNO_3$ in the ratio of

$3 : 1$ were taken in test tubes labelled as A, B and C. A small piece of metal was put in each test tube. No change occurred in test tubes A and B, but the metal got dissolved in test tube C, respectively. The metal could be

$Al$
$Au$
$Cu$
$Pt$

2. An alloy is

a compound
a homogeneous mixture
an element
a heterogeneous mixture

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32. NCERT Exemplar IX

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