The base principle of Cottrell’s precipitator is
Options
(a) neutralisation of charge on colloidal particles (b) scattering of light (c) Le-chatrlier’s principle (d) peptisation
Correct Answer:
neutralisation of charge on colloidal particles
Activated charcoal is used to remove colouring matter from pure substances.It works by
Options
(a) oxidation (b) reduction (c) bleaching (d) adsorption
Correct Answer:
adsorption
Explanation:
It has been observed that the surface […]
Identify the gas which is readily adsorbed by activated charcoal
Options
(a) N₂ (b) SO₂ (c) H₂ (d) O₂
Correct Answer:
SO₂
Explanation:
In general, more easily liquefiable gases ( i.e. higher critical […]
Which one of the following is wrong about molecularity of a reaction
Options
(a) It may be whole number or fractional (b) It is calculated from reaction mechanism (c) It is the number […]
The minimum amount of energy required for the reacting molecules to undergo reaction is called
Options
(a) threshold energy (b) activation energy (c) internal energy (d) potential energy
Correct Answer:
threshold energy
Explanation:
For […]
The term-dc/dt in a rate equation refers to
Options
(a) the decrease in concentration of the reactant with time (b) the concentration of a reactant (c) the change in concentration of the reactant […]
Hydrolysis of ester, in an acidic medium, is
Options
(a) first order reaction with molecularity two (b) first order reaction with molecularity one (c) second order reaction with molecularity two (d) second order […]
The mass of an object changes from 0.002 g to 0.00025 g in a time period of 1500 years.The half-life of the object is
Options
(a) 500 yrs (b) 850 yrs (c) 700 yrs […]
The unit of rate constant depends upon
Options
(a) rate of reaction (b) order of reaction (c) molecularity of reaction (d) all of the above
Correct Answer:
rate of reaction
Explanation:
r = […]
In the reaction : 2N₂O₅ → 4NO₂ + O₂, initial pressure is 500 atm and rate constant k is 3.38 ˣ 10⁻⁵ s⁻¹.After 10 minutes the final pressure of N₂O₅ is
Options
(a) […]
2017-2025 Copyright Doctor Dreams Training Academy - About Us - Privacy Policy - Terms & Conditions - Contact Us - Refund Policy