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Periodic Table and Periodicity
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Modern periodic table and classification of elements
JEE Main level
Single correct option
Difficulty 2 of 3
pt034
Which oxide of a third-period element is amphoteric?
A
Na
X
2
O
B
Al
X
2
O
X
3
C
SiO
X
2
D
P
X
4
O
X
10
Answer: B
Across period 3 oxides change from basic (
Na
X
2
O
, MgO) through amphoteric (
Al
X
2
O
X
3
) to acidic (
SiO
X
2
,
P
X
4
O
X
10
,
SO
X
3
,
Cl
X
2
O
X
7
).
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