When potassium permanganate strongly then it converted into Magnate ions (Green colour) and MnO2 (Brown black).Ans also gives oxygen gas.
Wednesday, March 16, 2022
When hydrogen peroxide is added to acidified potassium dichromate, a blue colour is produced due to formation of....?
(A) CrO3
Hence option (C) is correct.
(B) Cr2O3
(C) CrO5
(D) CrO4^-2
Solution:
When acidified solution of K2Cr2O7 are shaken with H2O2 in presence of ether , the ethereal layer turn blue due to the formation of CrO5 ( deep blue in colour).
Buckminsterfullerene: Bucky Balls: Allotrope of Carbon:
Fullerenes are made by the heating of Graphite in an electrical arc in the presence of inert gases such as helium or argon. Fullerenes are the only pure form of carbon because they have smooth structure without having "Dangling" bonds. Fullelerenes are cage like molecules. C60 molecules has a shape like soccer ball and hence calles Buckminsterfullerene.
Saturday, December 25, 2021
What acid in graps?
Tartaric acid, Citric acid and Malic acid are major acids present in grape juice. The distinctive taste of grape juice is due to presence of tartaric acid.
Saturday, December 18, 2021
The diameters of a buble at the surface of a lake is 4 mm and at the bottom of the lake is 1 mm. If atmospheric pressure is 1 atm and the temperature of the lake-water and the atmosphere are equal what is the depth of the lake ? (The density of lake-water and Hg are 1 gm/ml and 13.6 respectively. Also neglect the contribution of pressure due to surface tension)
Related questions:
(1) Liquid ammonia bottle is cooled before opening the seal. Explain.
(4) Out of dry air and wet air, which is heavier?
(5) Can we apply Dalton’s law of partial pressure to a mixture of carbon monoxide and oxygen?
(6) Why a bottle of liquid ammonia is cooled before opening the seal?
(7) Explain , Aerated water bottles are kept under water during summer why?
(9) Why falling liquid drops are spherical?
(10) Why diethyl ether has higher vapour pressure than ethyl alcohol at a particular temperature?
(11) Why liquid have a definite volume but no definite shape?
(12)What are the difference between Diffusion and Effusion ?
(12) What is payload of Balloon ?
(13)What is Aqueous tension ?
(14) What is Vander waals equation of state of a real gas ?
(15) What is Boyle's temperature ? and what is relation of Boyle's temperature with Vander waal's constant?
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