Biomolecules — Chemistry STD 12 Science — Question

Note: In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
3. Assertion is correct statement but reason is wrong statement.
4. Assertion and reason both are incorrect statements.
5. Assertion is wrong statement but reason is correct statement.

Assertion: When methyl alcohol is added to water, boiling point of water increases.
Reason: When a volatile solute is added to a volatile solvent elevation in boiling point is observed.

Calculate the Zn-Cu cell potential. ###Calculate standard cell potential of Daniell cell.

Write down limitation of Crystal field.

Explain giving reason:
Transition metals and many of their compounds show paramagnetic behaviour.

Calculate the time to deposit 1.5 g of silver at cathode when a current of 1.5 A was passed through the solution of AgNO₃. (Molar mass of Ag = 108 g mol^-1, 1F = 96500 C mol^-1)

Of all the methods of preparing amines identify by which aniline cannot be prepared?

Calculate the half-life of a first order reaction from their rate constants given below:

1. 200 s^–1
2. 2 min^–1
3. 4 years^–1

Differentiate between rate of reaction and reaction rate constant.

Write the name of the cell which is generally used in hearing aids. Write the reactions taking place at the anode and the cathode of this cell.