Model Paper 10 — Chemistry STD 11 Science — Question

Note: In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.
Assertion (A): Components of a mixture of red and blue inks can be separated by distributing the components between stationary and mobile phases in paper chromatography.
Reason (R): The coloured components of inks migrate at different rates because paper selectively retains different components according to the difference in their partition between the two phases.

1. Both A and R are correct and R is the correct explanation of A.
2. Both A and R are correct but R is not the correct explanation of A.
3. Both A and R are not correct.
4. A is not correct but R is correct.

Note: In the following questions a statement of Assertion (A) followed by a statement of reason (R) is given. Choose the correct option out of the choices given below each question.
Assertion (A): Generally, ionisation enthalpy increases from left to right in a period.
Reason (R): When successive electrons are added to the orbitals in the same principal quantum level, the shielding effect of inner core of electrons does not increase very much to compensate for the increased attraction of the electron to the nucleus.

1. Assertion is correct statement and reason is wrong statement.
2. Assertion and reason both are correct statements and reason is correct explanation of assertion.
3. Assertion and reason both are wrong statements.
4. Assertion is wrong statement and reason is correct statement.

Note: In the following questions a statement of assertion (A) followed by a statement of reason (R) is given. Choose the correct option out of the choices given below each question.
Assertion (A): The decomposition of hydrogen peroxide to form water and oxygen is an example of disproportionation reaction.
Reason (R): The oxygen of peroxide is in –1 oxidation state and it is converted to zero oxidation state in O₂ and –2 oxidation state in H₂O.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. Both A and R are false.

Direction: In the following Questions, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:

1. Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
2. Both assertion and Reason are true but Reason is not the correct explanation of Assertion.
3. Assertion is true but Reason is false.
4. Both Assertion and Reason are false.

Assertion: Increasing order of acidity of hydrogen halides is HF < HCl < HBr < HI
Reason: While comparing acids formed by the elements belonging to the same group of periodic table, H-A bond strength is a more important factor in determining acidity of an acid than the polar nature of the bond.

Assertion (A): Ozonolysis of alkynes are faster than ozonolysis of alkenes.
Reason (R): Reaction proceed by cyclic transition state are faster on alkynes.

Assertion (A): Molarity of a solution represents its concentration.
Reason (R): Molarity is the number of moles of solute per litre of solution.

Assertion (A): Splitting of the spectral lines in the presence of a magnetic field is known as the Stark effect.
Reason (R): The line spectrum is simplest for the hydrogen atoms.

Note: In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given\ below each question.
Assertion (A): For any chemical reaction at a particular temperature, the equilibrium constant is fixed and is a characteristic property.
Reason (R): Equilibrium constant is independent of temperature.

1. Both A and R are true and R is correct explanation of A.
2. Both A and R are true but R is not correct explanation of A.
3. A is true but R is false.
4. Both A and R are false.