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JEE Main 08 Apr 2018 Code A Solved Paper
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© examsnet.com
Question : 49
Total: 90
When metal ‘M’ is treated with NaOH, a white gelatinous precipitate ‘X’ is obtained,which is soluble in excess of NaOH. Compound ‘X’ when heated strongly gives an oxide which is used in chromatography as an adsorbent. The metal ‘M’ is :
Zn
Ca
Al
Fe
Validate
Solution:
A
l
+
N
a
O
H
→
A
l
(
O
H
)
3
↓
A
l
(
O
H
)
3
N
a
O
H
excess
–
–
–
–
–
–
–
–
–
–
>
N
a
A
l
O
2
Soluble
A
l
(
O
H
)
3
∆
–
–
–
>
A
l
2
O
3
© examsnet.com
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