Class 12th

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 [R] in the following sequence of reactions is:

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

The processes of calcination and roasting in metallurgical industries, respectively, can lead to:

The Crystal Field Stabilization Energy (CFSE) of [CoF₃(H₂O)₃](Δo < P) is :

A Young's double-slit experiment is performed using monochromatic light of wavelength λ. The intensity of light at a point on the screen, where the path difference is λ, is K units. The intensity of the light at a point where the path difference is λ/6 is given by nK/12, where ' n ' is an integer. The value of ' n ' is

Orange light of wavelength 6000 * 10^-10 m illuminates a single slit of width 0.6 * 10^-4 m. the maximum possible number of diffraction minima produced on both sides of the central maximum is