Class 12th

The one that can exhibit highest paramagnetic behaviour among the following is: gly = glycinato ; bpy = 2,2 '-bipyridine

If 75% of a first order reaction was completed in 90 minutes, 60% of the same reaction would be completed in approximately (in minutes)
(Take: log 2 = 0.30; log 2.5 = 0.40 )

A sample of red ink (a colloidal suspension) is prepared by mixing eosine dye, egg white, HCHO and water. The component which ensures stability of the ink sample is :

At 300 K, the vapour pressure of a solution containing 1 mole of n-hexane and 3 moles of n-heptane is 550 mm of Hg. At the same temperature, if one more mole of n-heptane is added to this solution, the vapour pressure of the solution increases by 10 mm of Hg. What is the vapour pressure in mmHg of n-heptane in its pure state ?

The major product [C] in the following reaction sequence will be:

The major product [R] in the following sequence of reactions is:

The major product [R] in the following sequence of reactions is:

In the following reaction sequence, [C] is:

In a series LR circuit, power of 400 W is dissipated from a source of 250 V, 50 Hz. The power factor of the circuit is 0.8 . In order to bring the power factor to unity, a capacitor of value C is added in series to the L and R. Taking the value of C as (n/3π) μF, then value of ' n ' is

250 mL of a waste solution obtained from the workshop of a goldsmith contains 0.1M AgNO3 and 0.1M AuCl. The solution was electrolyzed at 2 V by passing a current of 1 A for 15 minutes. The metal/metals electrodeposited will be : (E°Ag+/Ag = 0.8 V, E°Au+/Au = 1.69 V)