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Classification of Elements and Periodicity in Properties
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27/08/2021 10:53 am
Topic starter
Consider the following ionisation reactions :
I.E. (kJ mol-1) - I.E. (kJ mol–1)
A(g) → A+(g) + e-, A1 A(g) →A+(g) + e-, A1
B+(g) → B2+(g) + e-, B2C(g) → C+(g) + e-, C1
C+(g) → C2+(g) + e-, C1C2+(g) → C3+(g) + e-, C3
If monovalent positive ion of A, divalent positive ion of B and trivalent positive ion of C have zero electron. Then incorrect order of corresponding I.E. is:
(a) C3 > B2 > A1
(b) B1 > A1 > C1
(c) C3 > C2 > B2
(d) B2 > C3 > A1
1 Answer
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27/08/2021 11:00 am
Correct answer: (d) B2 > C3 > A1
Explanation:
A ⇒ H(1s1)
B ⇒ He(1s2)
C ⇒ Li(1s22s1)
A1 = IE1(A) B2 = IE2 (B)
B1 = IE1(B) C2 = IE2 (C)
C1 = IE1(C) C3 = IE3 (C)
B1 > A1 > C1 C3 > B2 > A1
He > H > Li
Li2+ He+ H
1s2 1s1 2s1
1s1 1s1 1s1
C3 > C2 > B2
Li2+ Li+ He+
1s2 1s2 1s1