Multiple Choice Question Answer IV — task. Science CBSE, Class 9.

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1. How many moles of magnesium phosphate,

$Mg_3(PO_4)_2$ will contain 0.25 mole of oxygen atoms?

$3.125$ x $10^-{^2}$
$2.5$ x $10^-{^2}$
$1.25$ x $10^-{^2}$
$0.2$ x $10^-{^2}$

2. The number of g-atom of oxygen in

$6.02$ ×

$10^2{^4}$ CO molecules is

1
0.5
5
10

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