A miscible mixture of C6H6 + CHCl3 can be separated by
sublimation
distillation
filtration
crystallisation
The half-life period of a first order reaction is 60 min. What percentage will be left over after 240 min?
6.25%
4.25%
5%
6%
Which of the following is not a colligative property?
Osmotic pressure
Optical activity
Depression in freezing point
Elevation in boiling point
B.
Optical activity
Optical activity is not a colligative property as it does not depend on the number of solute particles present in the solution. It mainly depends on the structure and ability to rotate the plane polarised light.
Which of the following is incorrect in a galvanic cell?
Oxidation occurs at anode
Reduction occurs at cathode
The electrode at which electrons are gained is called cathode
The electrode at which electrons are lost is called cathode
A secondary cell is one
can be recharged
can be recharged by passing current through it in the same direction
can be recharged by passing current through it in the opposite direction
cannot be recharged
Osmotic pressure of the solution can be increased by,
increasing the temperature of the solution
decreasing the temperature of the solution
increasing the volume of the vessel
diluting the solution
The amount of current in Faraday, is required for the reduction of 1 mole of Cr2O ions to Cr3+ is
1 F
2 F
6 F
4 F