Chemistry NCERT Exemplar Solutions Class 12th Chapter Five
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9 months agoContributor-Level 10
This is a Long Answers Type Questions as classified in NCERT Exemplar
Ans: This method is used for removing gangue from sulphide ores. In this, a suspension of powdered ore is made with water. To which both the collectors and froth stabilisers are added. Collectors for example pine oils, fatty acids, xanthates enhance non-wettability of the mineral particles and froth stabilisers such as cresols, aniline stabilise the froth.
New answer posted
9 months agoContributor-Level 10
This is a Long Answers Type Questions as classified in NCERT Exemplar
Ans: (i) Separation of inert gases: Due to a difference in the degree of adsorption of gases by charcoal, a mixture of noble gases can be separated by adsorption on coconut, a charcoal at different temperatures.
(ii) Adsorption indicators: Surfaces of certain precipitates such as silver halides have the property of adsorbing some dyes like eosin, fluorescein, and so produce a characteristic colour at end point.
(iii) Chromatographic analysis: It is based on the phenomenon of adsorption and has a number of applications in analytical and industrial fields.
New answer posted
9 months agoContributor-Level 10
This is a Long Answers Type Questions as classified in NCERT Exemplar
Ans: In heterogeneous catalysis reactants are generally in gas phase and catalyst are in solid phase. The activity of a catalyst depends upon the strength of chemisorption to a large extent. The reactants must get adsorbed reasonably strongly on to the catalyst to become active. However, they must not get adsorbed so strongly that they are immobilized and other reactants are left with no space on the catalyst's surface for adsorption. It has been found that for hydrogenation reaction, the catalytic activity increases from Group 5 to Group 11 metals with maximum activi
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