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JEE Main 8 Jan 2020 Shift 1 Solved Paper
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© examsnet.com
Question : 27
Total: 75
The first ionization energy (in kJ/mol) of Na, Mg, Al and Si respectively, are :
496, 737, 577, 786
786, 737, 577, 496
496, 577, 737, 786
496, 577, 786, 737
Validate
Solution:
Elecronic configuration of
N
a
=
[
N
e
]
3
s
1
M
g
=
[
N
e
]
3
s
2
A
l
=
[
N
e
]
3
s
2
3
p
1
S
i
=
[
N
e
]
3
s
2
3
p
2
So order of first ionisation energy is
N
a
<
M
g
>
A
l
<
S
i
kj/mol
Na < A1 < Mg < Si (
I
E
1
order)
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