1
IIT-JEE 2012 Paper 1 Offline
MCQ (Single Correct Answer)
+4
-1
The kinetic energy of an electron in the second Bohr orbit of a hydrogen atom is [$$\alpha_0$$ is Bohr radius]
A
$${h^2 \over {4{\pi ^2}m\alpha _0^2}}$$
B
$${h^2 \over {16{\pi ^2}m\alpha _0^2}}$$
C
$${h^2 \over {32{\pi ^2}m\alpha _0^2}}$$
D
$${h^2 \over {64{\pi ^2}m\alpha _0^2}}$$
2
IIT-JEE 2012 Paper 1 Offline
MCQ (Single Correct Answer)
+1
-0.25
In allene (C3H4), the type(s) of hybridisation of the carbon atoms is (are):
A
sp and sp3
B
sp and sp2
C
only sp3
D
sp2 and sp3
3
IIT-JEE 2012 Paper 1 Offline
MCQ (More than One Correct Answer)
+2
-0.5
Choose the correct reason for the stability of the Iyophobic colloidal particles
A
Preferential adsorption of ions on their surface from the solution
B
Preferential adsorption of solvent on their surface from the solution
C
Attraction between different particles having opposite charges on their surface
D
Potential difference between the fixed layer and the diffused layer of opposite charges around the colloidal particles.
4
IIT-JEE 2012 Paper 1 Offline
Numerical
+3
-0
29.2 % (w/w) HCl stock solution has density of 1.25 g mL-1 . The molecular weight of HCl is 36.5 g mol-1 . The volume (mL) of stock solution required to prepare a 200 mL solution of 0.4 M HCl is
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