Science (English Medium) कक्षा १२ - CBSE Question Bank Solutions

Which of the following statements are incorrect about receptor proteins?

(i) Majority of receptor proteins are embedded in the cell membranes.

(ii) The active site of receptor proteins opens on the inside region of the cell.

(iii) Chemical messengers are received at the binding sites of receptor proteins.

(iv) Shape of receptor doesn’t change during attachment of messenger.

Where are receptors located?

How are receptor proteins located in the cell membrane?

Match the class of compounds given in Column I with their functions given in Column II.

Assertion: Receptors are crucial to body’s communication process.

Reason: Receptors are proteins.

Assertion: Chemical messengers are chemicals that enable communication of message between two neurons or between neurons and muscles.

Reason: Chemicals enter the cell through receptor.

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

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

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

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

What happens when reactions:

Benzylchloride is treated with ammonia followed by the reaction with Chloromethane.

Represent the cell in which the following reaction takes place.The value of E˚ for the cell is 1.260 V. What is the value of E_cell?

\[\ce{2Al (s) + 3Cd^{2+} (0.1M) -> 3Cd (s) + 2Al^{3+} (0.01M)}\]

Classify the following amine as primary, secondary or tertiary:

Classify the following amine as primary, secondary or tertiary:

Classify the following amine as primary, secondary or tertiary:

(C₂H₅)₂CHNH₂

Write the IUPAC name of the following compound.

Explain the observation, at the end of each period, there is a slight increase in the atomic radius of d-block elements.

Write the expression of integrated rate equation for zero order reaction.

What are Homoleptic complexes?

Why chelate complexes are more stable than complexes with unidentate ligands?

Name the element of 3d series which exhibits the largest number of oxidation states. Give reason.

What are Heteroleptic complexes?