If sodium sulphate is considered to be completely dissociated into cations and anions in aqueous solution, the change in freezing point of water (ΔTf), when 0.01 mol of sodium sulphate is dissolved in 1 kg of water, is (Kf=1.86K kg mol−1)
Connecting you to a tutor in 60 seconds.
Get answers to your doubts.
The speed of sound in oxygen (O2) at a certain temperature is 460ms−1. The speed of sound in helium (He) at the same temperature will be (assumed both gases to be ideal)
Two liquids X and Y form an ideal solution. At 300K, vapour pressure of the solution containing 1 mol of X and 3 mol of Y is 550 mm Hg. At the same temperature, if 1 mol of Y is further added to this solution, vapour pressure of the solution increases by 10 mm Hg. Vapour pressure (in mmHg) of X and Y in their pure states will be, respectively
Among the following substituted silanes the one which will give rise to cross linked silicone polymer on hydrolysis is
In the following sequence of reactions, the alkene affords the compound 'B' CH3CH=CHCH3→O3A2n→H2OB
A liquid was mixed with ethanol and a drop of concentrated H2SO4 was added. A compound with a fruity smell was formed. The liquid was:
Phenol, when it first react with concentrated sulphuric acid and then with concentrated nitric acid, gives
Consider a rubber ball freely falling from a height h = 4.9 m onto a horizontal elastic plate. Assume that the duration of collision is negligible and the collision with the plate is totally elastic. Then the velocity as a function of time the height as function of time will be
The sum of the series20C0−20C1+20C2−20C3+…−…+20C10 is: