1
JEE Advanced 2017 Paper 2 Offline
MCQ (More than One Correct Answer)
+4
-1
Change Language
The correct statement(s) about surface properties is (are)
A
Adsorption is accompanied by decrease in ethalpy and decrease in entropy of the system
B
The critical temperatures of ethane and nitrogen are $$563$$ $$K$$ and $$126$$ $$K,$$ respectively. The adsorption of ethane will be more than that of nitrogen on same amount of activated charcoal at a given temperature
C
Cloud is an emulsion type of colloid in which liquid is dispersed phase and gas is dispersion medium
D
Brownian motion of colloidal particles does not depend on the size of the particles but depends on viscosity of the solution
2
JEE Advanced 2016 Paper 2 Offline
MCQ (More than One Correct Answer)
+4
-2
Change Language
The CORRECT statement(s) for cubic close packed (ccp) three dimensional structure is (are) :
A
The number of the nearest neighbours of an atom present in the topmost layer is 12
B
The efficiency of an atom packing is 74%
C
The number of octahedral and tetrahedral voids per atom are 1 and 2, respectively
D
The unit cell edge length is $$2 \sqrt 2$$ times the radius of the atom
3
JEE Advanced 2015 Paper 2 Offline
MCQ (More than One Correct Answer)
+4
-2
When O2 is adsorbed on a metallic surface, electron transfer occurs from the metal to O2. The true statement(s) regarding this adsorption is(are)
A
O2 is physisorbed
B
Heat is released
C
Occupancy of $$\pi _{2p}^*$$ of O2 is increased
D
Bond length of O2 is increased
4
JEE Advanced 2015 Paper 1 Offline
MCQ (More than One Correct Answer)
+4
-2
If the unit cell of a mineral has cubic close packed (ccp) array of oxygen atoms with m fraction of octahedral holes occupied by aluminium ions and n fraction of tetrahedral holes occupied by magnesium ions, m and n, respectively, are
A
1/2, 1/8
B
1, 1/4
C
1/2, 1/2
D
1/4, 1/8
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