Ncert Solutions Chemistry Class 12th
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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
New answer posted
10 months agoContributor-Level 10
This is a assertion and reason answer type question as classified in NCERT Exemplar
(ii) Assertion and reason both are correct statements but reason is not correct
Explanation for assertion.
Explanation: Assertion is correct statement but reason is a wrong statement because a semipermeable membrane allows solvent molecules to move through a lower concentration solution to a higher concentration solution, osmosis is the flow of solvent molecules from the solvent side to the solution side through a semipermeable membrane.
New answer posted
10 months agoContributor-Level 10
This is a assertion and reason answer type question as classified in NCERT Exemplar
(i) Assertion and reason both are correct statements and reason is correct explanation for assertion.
Explanation: When a nonvolatile solute (such as NaCl) is added to water, a NaCl solution is created. When compared to pure water, the solution has a lower vapour pressure because there are less water molecules at the liquid's surface. A dip, or drop in the freezing point of water, is noticed as a result of this decrease in vapour pressure.
New answer posted
10 months agoContributor-Level 10
This is a assertion and reason answer type question as classified in NCERT Exemplar
(iv) Assertion and reason both are incorrect statements.
Explanation: (i) Both methyl alcohol and water are volatile liquids that, when mixed together to produce a binary solution, have a higher vapour pressure than the separate pure components. The boiling point of water is reduced as a result of this.
(ii) When methyl alcohol is introduced to water, the A-B interaction (also known as the A-A or B-B interaction) occurs, resulting in a positive divergence from Raoult's rule. The boiling point decreases when a positive di
New answer posted
10 months agoContributor-Level 10
(i) Assertion and reason both are correct statements and reason is correct explanation for assertion.
Explanation: (i) In terms of 'Molarity (M), ' the number of moles of the solute dissolved per litre of solution is the strength of a solution.
(ii) Because the volume of a liquid changes with temperature, the volume of a solution changes as well, while the number of moles of solute in it remains constant (or unchanged). As a result, the molarity of the solution would be affected.
New answer posted
10 months agoContributor-Level 10
This is a matching answer type question as classified in NCERT Exemplar
(i)- (d); (ii)- (c); (iii)- (b); (iv)- (e); (v)- (a)
New answer posted
10 months agoContributor-Level 10
This is a matching answer type question as classified in NCERT Exemplar
(i)- (c); (ii)- (e); (iii)- (d); (iv)- (a); (v)- (b)
New answer posted
10 months agoContributor-Level 10
This is a matching answer type question as classified in NCERT Exemplar
(i)- (e); (ii)- (c); (iii)- (d); (iv)- (b); (v)- (a)
New answer posted
10 months agoContributor-Level 10
This is a matching answer type question as classified in NCERT Exemplar
(i)- (d); (ii)- (c); (iii)- (a); (iv)- (b); (v)- (f); (vi)- (e)
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