1
JEE Main 2015 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
The vapour pressure of acetone at 20oC is 185 torr. When 1.2 g of a non-volatile substance was dissolved in 100 g of acetone at 20oC, its vapour pressure was 183 torr. The molar mass (g mol-1) of the substance is:
A
64
B
128
C
488
D
32
2
JEE Main 2015 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
Two Faraday of electricity is passed through a solution of CuSO4. The mass of copper deposited at the cathode is: (at. mass of Cu = 63.5 amu)
A
63.5 g
B
2 g
C
127 g
D
0 g
3
JEE Main 2015 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
Higher order (>3) reactions are rare due to
A
increase in entropy and activation energy as more molecules are involved
B
shifting of equilibrium towards reactants due to elastic collisions
C
loss of active species on collision
D
low probability of simultaneous collision of all the reacting species
4
JEE Main 2015 (Offline)
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
In the context of the Hall-Heroult process for the extraction of Al, which of the following statements is false?
A
Al2O3 is mixed with CaF2 which lowers the melting point of the mixture and brings conductivity
B
Al3+ is reduced at the cathode to form Al
C
Na3AlF6 serves as the electrolyte
D
CO and CO2 are produced in this process
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