1
AIPMT 2003
MCQ (Single Correct Answer)
+4
-1
The radioistope, tritium ($${}_1^3$$H) has a half-life of 12.3 years. If the initial amount of tritium is 32 mg, how many milligrams of it would remain after 49.2 years?
A
1 mg
B
2 mg
C
4 mg
D
8 mg
2
AIPMT 2003
MCQ (Single Correct Answer)
+4
-1
The number of unpaired electrons in the complex ion [CoF6]3$$-$$ is
(Atomic no. : Co = 27)
A
2
B
3
C
4
D
zero
3
AIPMT 2003
MCQ (Single Correct Answer)
+4
-1
Among the following which is not the $$\pi $$-bonded organometallic compound?
A
K [PtCl3 ($$\eta $$2 $$-$$ C2H4)]
B
Fe ($$\eta $$5 $$-$$ C5H5)2
C
Cr ($$\eta $$6 $$-$$ C6H6)2
D
(CH3)4Sn
4
AIPMT 2003
MCQ (Single Correct Answer)
+4
-1
If a ball is thrown vertically upwards with speed u, the distance covered during the last t seconds of its ascent is
A
ut
B
$${1 \over 2}$$ gt2
C
ut $$-$$ $${1 \over 2}$$ gt2
D
(u + gt) t.
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