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WBJEE 2014 Chemistry Solved Paper
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© examsnet.com
Question : 14
Total: 60
98
C
f
246
was formed along with a neutron when an unknown radioactive substance was bombarded with
6
C
12
. Theunknown substance was
91
P
a
234
90
T
h
234
92
U
235
92
U
238
Validate
Solution:
Z
X
A
+
6
C
12
→
98
C
f
246
+
0
n
1
z + 6 = 98
⇒ z = 92
A + 12 = 246 + 1
or, A = 247 - 12
= 235
∴ The element is
92
U
236
© examsnet.com
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