Chemistry NCERT Exemplar Solutions Class 12th Chapter Five
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9 months agoContributor-Level 10
This is a Short Answers Type Questions as classified in NCERT Exemplar
Ans: The charged colloidal particles start moving towards oppositely charged electrodes.
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9 months agoContributor-Level 10
This is a Short Answers Type Questions as classified in NCERT Exemplar
Ans: The colloidal impurities present in water get coagulated by added alum, thus making water potable.
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9 months agoContributor-Level 10
This is a Short Answers Type Questions as classified in NCERT Exemplar
Ans: It is a 4% solution of nitrocellulose in a mixture of alcohol and ether.
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9 months agoContributor-Level 10
This is a Short Answers Type Questions as classified in NCERT Exemplar
Ans: Ice creams are emulsions which get stabilised by emulsifying agents like gelatin.
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9 months agoContributor-Level 10
This is a Short Answers Type Questions as classified in NCERT Exemplar
Ans: Clouds are colloidal in nature and carry charge. Spray of silver iodide, an electrolyte, results in coagulation leading to rain.
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9 months agoContributor-Level 10
This is a Short Answers Type Questions as classified in NCERT Exemplar
Ans: Gold sol is a lyophobic sol. Addition of gelatin stabilises the gold sol.
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9 months agoContributor-Level 10
This is a Short Answers Type Questions as classified in NCERT Exemplar
Ans: At lower concentration soap forms a normal electrolytic solution with water. After a certain concentration called critical micelle concentration, colloidal solution is formed.
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9 months agoContributor-Level 10
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Ans: Chemisorption involves formation of bond between gaseous molecules/atoms and the solid surface for which high activation energy is required. Thus it is referred to as activated adsorption.
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9 months agoContributor-Level 10
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Ans: It is important to have clean surface as it facilitates the adsorption of desired species.
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Ans: Catalytic reaction which depends on the pore structure of catalyst and size of the reactant, product molecules is known as shape-selective catalysis. Zeolites are considered as good shape-selective catalysts due to their honeycomb-like structures. They are aluminosilicates with three-dimensional network of silicates wherein some of the silicon atoms are replaced by aluminium atoms giving Al-O-Si frame work. The reactions taking place in zeolites depends upon size and shape of reactant and product molecules, the pores and cavities of the zeolites also. They are fo
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