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a)iii) molecule
b) iii) Al2O3
c) II) two
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Answer:
a) (iii) molecule
b) (iii) Al2O3
c) (iv) 4
Explanation:
Q. (a). The formula of a compound represents a molecule. Yes the formula represents the different type of atoms present in a specific ratio in a molecule. For example H2O represents water molecule
Q. (b). The formula of aluminum oxide is Al2O3. The ox.no of aluminum is +3 and the ox.no of oxygen is -2, Crisscrossing these numbers, we get the formula Al2O3
Q. (c). The valency of nitrogen in NO2 is 4.
The oxidation state of oxygen in most of it's compounds is -2. Since the net charge is 0, the molecule is neutral. Let x be the ox.no of N
x + 2(-2) = 0
x = +4
Hence valency is 4.
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Ps : Valency is different from oxidation state. sometimes valency called be equal to ox.no without any signs.