Download App

Classification of Elements and Periodicity in Properties — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryClassification of Elements and Periodicity in Properties1 Mark
Question
Assertion (A): Electron gain enthalpy becomes less negative as we go down a group.
Reason (R): Size of the atom increases on going down the group and the added electron would be farther from the nucleus.
  1. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  2. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  3. Assertion and reason both are wrong statements.
  4. Assertion is wrong statement but reason is correct statement.
✓

Answer

  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.

Explanation:

On moving down the group, the electron gain enthalpy becomes less negative because on moving down the group the atomic size increases and the added electron lies away from the nucleus.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Assertion (A) & Reason (B) MCQ" from Classification of Elements and Periodicity in Properties→Classification of Elements and Periodicity in Properties — all question types→Chemistry STD 11 Science question papers→Rajasthan Board STD 11 Science question papers→Rajasthan Board question paper generator→

Similar questions

Assertion (A): Atomic mass has no unit but is expressed in amu.
Reason (R): It is the average mass of an atom taking care of the relative abundance of all its possible isotopes.
→
Notes: 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): Combustion of all organic compounds is an exothermic reaction.
Reason (R) : The enthalpies of all elements in their standard state are zero.
  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.  A is false but R is true.
→
Notes: 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) : A liquid crystallises into a solid and is accompanied by decrease in entropy.
Reason (R) : In crystals, molecules organise in an ordered manner.
  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.  A is false but R is true.
→
Assertion (A): Both cyclopropane and propene give addition reactions readily.
Reason (R): Cyclopropane and propene are isomers of each other.
→
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: The molecular orbitals with higher energy is called anti bonding orbitals.
Reason: The anti bonding nature of a molecular orbital is indicated by an asterisk over its designation.
→
Assertion (A): In case of isoelectronic ions the ionic size increases with the increase in atomic number.
Reason (R): The greater the attraction of nucleus, greater is the ionic radius.
→
Notes: 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) : Spontaneous process is an irreversible process and may be reversed by some external agency.
Reason (R) : Decrease in enthalpy is a contributory factor for spontaneity.
  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. A is false but R is true.
→
Assertion (A): Ozonolysis of alkynes are faster than ozonolysis of alkenes.
Reason (R): Reaction proceed by cyclic transition state are faster on alkynes.
→
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): Aqueous solution of ammonium carbonate is basic.
Reason (R): Acidic/ basic nature of a salt solution of a salt of weak acid and weak base depends on Ka and Kb value of the acid and the base forming it.
  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.
→
Assertion (A): Energy of radiation is large if its wavelength is large.
Reason (R): Energy $= h \nu\left(\nu=\right.$ frequency, $\left.\nu=\frac{c}{\lambda}\right)$
→