Question

1)What is oxidation number of oxygen In Na2O2, Na2O, OF2, compounds ?
A) -2, -I, O
(B) -1, -2, -1
(C) -1.-2. +2
(D) None of these
2)In the following which configuration shows halogen's configuration ?
A) [Ne] 2s^2 2p^4
(B) [Ar]3s^2 3p^3
(C) [Kr] 4d^105s^25p^5
(D) 1s^1
3)Which element shown less shield effect ?
(A) Group-12. period-4
(B) Group-12 period-3
10) Group-12. penod-2
(Dj Group-12. period-5
4)Each elements of fourth period
A) Contain 4 electron less than octer
(B) They have four complete orbits.
C) The have completely four sub shells
(D) They have four elections in outer most orbit​

Answer 1

Answer:

1. none of these
2. D
3. D
4. B
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