Chemistry NCERT Exemplar Solutions Class 12th Chapter Sixteen
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3 months agoContributor-Level 10
This is a long answer type question as classified in NCERT Exemplar
Synthetic detergents are cleansing agents which have all the properties of soaps, but which actually do not contain any soap. These can be used both in soft and hard water as they given foam even in hard water. Detergents can be classified into three groups according their chemical nature.
(i) Anionic detergents – These are sodium salts of sulphonated long chain alcohols or hydrocarbons and sodium alkyl benzene sulphonates. e.g., CH3 (CH2)10CH2OSO3– Na+
Anionic part of these detergents is involved in cleansing action.
(ii) Cationic detergents – These are quate
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3 months agoNew answer posted
3 months agoContributor-Level 10
This is a long answer type question as classified in NCERT Exemplar
Enzymes catalyse many reactions by
(i) Holding the substrate for a chemical reaction. Active sites hold the substrate molecule in a suitable positions So that it can be attacked by the reagent effectively. Substrates bind to the active site of enzyme through ionic or hydrogen bonding or van there Waals or dipole-dipole, interactions.
(ii) Enzyme provides functional groups that will attack the substrate to carry out the chemical reaction. This function is carried out chemical reaction: This function iscarried out by some other amino acid residues of protein present
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3 months agoContributor-Level 10
This is a long answer type question as classified in NCERT Exemplar
Both prontosil and Salvarsan and antibacterial drugs (antimicrobials) discovered by Paul Ehrlich. Salvarsan is also known as arsphenamine. It is an organoarsenic molecule and has -As = As- double bond.
Salvarsan and prontosil show similarity in their structure. Both of these drugs are antimicrobials. Salvarsan contains -As = As- linkage whereas prontosil has -N = N- linkage.
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3 months agoContributor-Level 10
This is a assertion and reason answer type question as classified in NCERT Exemplar
(b) Artificial sweeteners do not provide any calories because they are inert and do not metabolise in the body.
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3 months agoContributor-Level 10
This is a assertion and reason answer type question as classified in NCERT Exemplar
(b) Preservatives are added to the food items because they inhibit the growth of microorganisms.
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3 months agoContributor-Level 10
This is a assertion and reason answer type question as classified in NCERT Exemplar
(c) Chemicals which are added to food items to prevent them from spoiling against bacteria yeast and moulds are called food preservatives. They do not increase nutritive value of food.
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3 months agoContributor-Level 10
This is a assertion and reason answer type question as classified in NCERT Exemplar
(d) Chemical messenger binds the receptor site and gives the message to the cell without entering the cell.
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3 months agoContributor-Level 10
This is a assertion and reason answer type question as classified in NCERT Exemplar
(b) Chemical messenger gives message to the cell without entering the cell because it is received at the binding site of the receptor.
New answer posted
3 months agoContributor-Level 10
This is a assertion and reason answer type question as classified in NCERT Exemplar
(e) Non-competitive inhibitors inhibit the catalytic activity of enzyme by binding with its allosteric site.
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