Download App

Model Paper 3 — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryModel Paper 31 Mark
MCQ
Assertion (A): Fluoride has the lowest and iodide has the highest boiling point.
Reason (R): Boiling points of haloalkanes increases with increasing atomic mass.
  • ✓
    Both A and R are true and R is the correct explanation of A.
  • B
    Both A and R are true but R is not the correct explanation of A.
  • C
    A is true but R is false.
  • D
    A is false but R is true.
✓

Answer

Correct option: A.
Both A and R are true and R is the correct explanation of A.
(a) Both A and R are true and R is the correct explanation of A .
Explanation: For a given halogen the boiling point rises with increasing atomic mass of the halogen, so that fluoride has the lowest boiling point and iodide has the highest boiling point.

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 Model Paper 3→Model Paper 3 — all question types→Chemistry STD 11 Science question papers→Rajasthan Board STD 11 Science question papers→Rajasthan Board question paper generator→

Similar questions

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): Combustion of 16g of methane gives 18g of water.

Reason (R): In the combustion of methane, water is one of the products.

  1. Both A and R are true but R is not the correct explanation of A.
  2. A is true but R is false.
  3. A is false but R is true.
  4. Both A and R are false.
→
Assertion (A): Moving phase is liquid and stationary phase is solid in paper chromatography.
Reason (R): Paper chromatography is used for analysis of polar organic compounds.
→
Assertion (A): Sulphur present in an organic compound can be estimated quantitatively by Carius method.
Reason (R): Sulphur can be separated easily from other atoms in the molecule, by lassiagn's test, but the yellow precipitate cannot be obtained.
→
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): Nitration of benzene with nitric acid requires the use of concentrated sulphuric acid.
Reason (R): The mixture of concentrated sulphuric acid and concentrated nitric acid produces the electrophile, $\text{NO}_2^+$.
  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.
→
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: A solution containing a mixture of acetic acid and sodium acetate maintains a constant value of pH on addition of small amounts of acid or alkali.
Reason: A solution containing a mixture of acetic acid and sodium acetate acts as a buffer solution around pH 4.75.
→
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): A solution containing a mixture of acetic acid and sodium acetate maintains a constant value of pH on addition of small amounts of acid or alkali.
Reason (R): A solution containing a mixture of acetic acid and sodium acetate acts as a buffer solution around pH 4.75.
  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 the correct explanation of A.
  3. A is true but R is false.
  4. Both A and R are false.
→
Assertion (A): Simple distillation can help in separating a mixture of propan-1-ol (boiling point $97^{\circ} C$ ) and propanone (boiling point $56^{\circ} C$ ).
Reason (R): Liquids with a difference of more than $20^{\circ} C$ in their boiling points can be separated by simple distillation.
→
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: Ionic compounds usually have high melting and boiling points.
Reason: A large amount of energy is needed to overcome the strong interionic electrostatic attractive forces.
→
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 empirical mass of ethene is half of its molecular mass.
Reason (R): The empirical formula represents the simplest whole number ratio of various atoms present in a compound.
  1. Both A and R are true and R is the correct explanation of A.
  2. A is true but R is false.
  3. A is false but R is true.
  4. Both A and R are false.
→
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 ionisation of hydrogen sulphide in water is low in the presence of hydrochloric acid.
Reason (R): Hydrogen sulphide is a weak acid.
  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.
→