Question 3
The chemical symbol for nitrogen gas is
(a) Ni
(b) $N_{2}$
(c) $N^{+}$
(d) N

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Solution

The chemical symbol for nitrogen is $N$ . But due to the incomplete outer most shell of nitrogen atom, the gaseous form of nitrogen always exist as dinitrogen molecule which is represented as $N_{2}$ .

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N_{2}

N^{+}

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Question 12

Write the correct answer from the given four options.

The sum of first n odd natural numbers is

a) $2 n + 1$
b) $n^{2}$
c) $n^{2} - 1$
d) $n^{2} + 1$

$P (n) : 1.2 + 2.3 + 3.4 + . . . + n (n + 1) = \frac{(n + 1) (n + 2)}{3}$

The statement P(n) is

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