Question 16

The electronic configurations of the elements A, B and C are given below. Answer the question on the basis of these configurations.

A $1 s^{2}$ $2 s^{2}$ $2 p^{6}$

B $1 s^{2}$ $2 s^{2}$ $2 p^{6}$ $3 s^{2}$ $3 p^{3}$

C $1 s^{2}$ $2 p^{6}$ $2 p^{6}$ $3 s^{2}$ $3 p^{5}$

The molecular formula of the compound formed from B and C will be

(a) BC

(b) $B_{2} C$

(c) $B C_{2}$

(d) $B C_{3}$

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Solution

Answer: (d).

The electronic configuration shows that B represents phosphorus and C represents chlorine. The stable compound formed is $P C l_{3} i . e ., B C_{3}$

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Question 17

The electronic configurations of the elements A, B and C are given below. Answer the question on the basis of these configurations.

A $1 s^{2}$ $2 s^{2}$ $2 p^{6}$

B $1 s^{2}$ $2 s^{2}$ $2 p^{6}$ $3 s^{2}$ $3 p^{3}$

C $1 s^{2}$ $2 p^{6}$ $2 p^{6}$ $3 s^{2}$ $3 p^{5}$

The bond between B and C will be

(a) ionic

(b) covalent

(d) coordinate

1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{1}

1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}, 3 p^{4}

X

Y

X = 2, 8, 2

Y = 2, 8, 7

(a) 2, 8, 2
(b) 2, 8, 1
(c) 2, 8, 7
(d) 2, 1

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