Which among the following statements is/are incorrect?
1) The electron affinity of Si is greater than that of C
) Beo is amphoteric while B, O, is acidic
1) The first ionisation energy of Ti is less than that of Al
iv) lonisation energy of elements of copper series is less than that of the respective elements of
group
1) i and m
2) i and iv
3) i, il and iv
4) iii only
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Answers
Answer:
answer is little long once you read it
Explanation:
The electron affinity for sulphur is more exothermic than that for oxygen.
B
Successive ionization energies of an atom always increase.
C
First ionization energy of As is greater than that of Se.
D
Chlorine has larger atomic size as well as electron affinity than that of fluorine.
(A) An oxygen atom is smaller as compared to sulphur; so in oxygen, there is more inter-electronic repulsion than that of sulphur.
(B) Charge increases so size decrease and number of electrons per proton also decreases; so valence shell electron gradually becomes more tightly held by the nucleus. Hence ionization energies of an atom always increase.
(C) Valance shell electron configuration of As is ns
2
np
3
(half filled stable configuration) and valence shell electron configuration of Se is ns
2
np
4
(partial filled less stable configuration).
As=0.947MJ/mole;Se=0.941MJ/mole.
(D) Down the group atomic size increases. Fluorine experiences more inter electronic repulsion than that of chlorine; so fluorine has less electron affinity than that of chlorine