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New answer posted

a year ago

Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter Sixteen

In what respect do prontosil and Salvarsan resemble? Is there any resemblance between azo dye and prontosil? Explain.
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Payal Gupta

Contributor-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.

New answer posted

a year ago

Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter Sixteen

Assertion (A): Artificial sweeteners are added to the food to control the intake of calories.

Reason (R): Most of the artificial sweeteners are inert and do not metabolise in the body.

(a) Assertion and reason both are correct statements but reason does not explain assertion.

(b) Assertion and reason-both are correct statements and reason explains the assertion.

(c) Both assertion and reason are wrong statement.

(d) Assertion is correct statement and reason is wrong statements.

(e) Assertion is wrong statements and reason is correct statement.
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Payal Gupta

Contributor-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.

New answer posted

a year ago

Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter Sixteen

Assertion (A): Preservative are added to food items.

Reason (R): Preservatives inhibit the growth of microorganisms.

(a) Assertion and reason both are correct statements but reason does not explain assertion.

(b) Assertion and reason-both are correct statements and reason explains the assertion.

(c) Both assertion and reason are wrong statement.

(d) Assertion is correct statement and reason is wrong statements.

(e) Assertion is wrong statements and reason is correct statement.
0 Follower 2 Views

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Payal Gupta

Contributor-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.

New answer posted

a year ago

Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter Sixteen

Assertion (A): All chemicals added to food items are called food preservatives.

Reason (R): All these chemicals increase the nutritive value of the food.

(a) Assertion and reason both are correct statements but reason does not explain assertion.

(b) Assertion and reason-both are correct statements and reason explains the assertion.

(c) Both assertion and reason are wrong statement.

(d) Assertion is correct statement and reason is wrong statements.

(e) Assertion is wrong statements and reason is correct statement.
0 Follower 4 Views

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Payal Gupta

Contributor-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.

New answer posted

a year ago

Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter Sixteen

Assertion (A): Receptor proteins show selectivity for one chemical messenger over the other.

Reason (R): Chemical messenger binds to the receptor site and inhibits its natural function.

(a) Assertion and reason both are correct statements but reason does not explain assertion.

(b) Assertion and reason-both are correct statements and reason explains the assertion.

(c) Both assertion and reason are wrong statement.

(d) Assertion is correct statement and reason is wrong statements.

(e) Assertion is wrong statements and reason is correct statement.
0 Follower 1 View

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Payal Gupta

Contributor-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.

New answer posted

a year ago

Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter Sixteen

Assertion (A): Chemical messenger gives message to the cell without entering the cell.

Reason (R): Chemical messenger is received at the binding site of receptor proteins.

(a) Assertion and reason both are correct statements but reason does not explain assertion.

(b) Assertion and reason-both are correct statements and reason explains the assertion.

(c) Both assertion and reason are wrong statement.

(d) Assertion is correct statement and reason is wrong statements.

(e) Assertion is wrong statements and reason is correct statement.
0 Follower 1 View

P
Payal Gupta

Contributor-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

a year ago

Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter Sixteen

Assertion (A): Non-competitive inhibitor inhibits the catalytic activity of enzyme by binding with its active site.

Reason (R): Non-competitive inhibitors changes the shape of the active site in such a way that substrate cannot recognize it.

(a) Assertion and reason both are correct statements but reason does not explain assertion.

(b) Assertion and reason-both are correct statements and reason explains the assertion.

(c) Both assertion and reason are wrong statement.

(d) Assertion is correct statement and reason is wrong statements.

(e) Assertion is wrong statements and reason is correct statement.
0 Follower 1 View

P
Payal Gupta

Contributor-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.

New answer posted

a year ago

Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter Sixteen

Assertion (A): Competitive inhibitors compete with natural substrate for their attachment on the active sites of enzymes.

Reason (R): In competitive inhibition, inhibitor binds to the allosteric site of the enzyme.

(a) Assertion and reason both are correct statements but reason does not explain assertion.

(b) Assertion and reason-both are correct statements and reason explains the assertion.

(c) Both assertion and reason are wrong statement.

(d) Assertion is correct statement and reason is wrong statements.

(e) Assertion is wrong statements and reason is correct statement.
0 Follower 5 Views

P
Payal Gupta

Contributor-Level 10

This is a assertion and reason answer type question as classified in NCERT Exemplar

(d) In competitive inhibition, inhibitor binds to the active site of the enzyme.

New answer posted

a year ago

Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter Sixteen

Assertion (A): Sodium chloride is added to precipitate soap after saponification.

Reason (R): Hydrolysis of esters of long chain fatty acids by alkali produces soap in colloidal form.

(a) Assertion and reason both are correct statements but reason does not explain assertion.

(b) Assertion and reason-both are correct statements and reason explains the assertion.

(c) Both assertion and reason are wrong statement.

(d) Assertion is correct statement and reason is wrong statements.

(e) Assertion is wrong statements and reason is correct statement.
0 Follower 2 Views

P
Payal Gupta

Contributor-Level 10

This is a assertion and reason answer type question as classified in NCERT Exemplar

  (a) Hydrolysis of esters of long chain fatty acids by alkali gives soap a colloid. The process is called saponification.
Sodium chloride is added to precipitate soap which is in colloidal form.

New answer posted

a year ago

Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter Sixteen

Assertion (A): Transparent soaps are made by dissolving soaps in ethanol.

Reason (R): Ethanol makes things invisible.

(a) Assertion and reason both are correct statements but reason does not explain assertion.

(b) Assertion and reason-both are correct statements and reason explains the assertion.

(c) Both assertion and reason are wrong statement.

(d) Assertion is correct statement and reason is wrong statements.

(e) Assertion is wrong statements and reason is correct statement.
0 Follower 1 View

P
Payal Gupta

Contributor-Level 10

This is a assertion and reason answer type question as classified in NCERT Exemplar

  (d) Ethanol removes air and moisture which scatter light.

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