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Question
Chemistry
Which of the following are formula of methanides? Be2C CaC2 Mg2C3 Al4C3
Q. Which of the following are formula of methanides?
B
e
2
C
C
a
C
2
M
g
2
C
3
A
l
4
C
3
2926
228
AIIMS
AIIMS 2019
The p-Block Elements
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A
Only 1 and 4
85%
B
Only 1 and 2
8%
C
Only 3 and 4
8%
D
Only 2 and 4
0%
Solution:
B
e
2
C
+
4
H
2
O
→
2
B
e
(
O
H
)
2
+
C
H
4
C
a
C
2
+
2
H
2
O
→
C
a
(
O
H
)
2
+
C
2
H
2
M
g
2
C
3
+
4
H
2
O
→
2
M
g
(
O
H
)
2
+
C
3
H
4
S
i
C
+
H
2
O
above
130
0
∘
C
temp.
S
i
O
2
+
C
H
4