Download App

Model Paper 9 — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryModel Paper 91 Mark
MCQ
Assertion (A): 22-carat gold is a compound.
Reason (R): A compound has fixed composition of the elements present in it.
  • A
    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.
  • ✓
    A is false but R is true.
✓

Answer

Correct option: D.
A is false but R is true.
(d) A is false but R is true.
Explanation: A is false but R is true.

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 9→Model Paper 9 — 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): Hydrogen atom has only one electron in its orbit. But it produces several spectral lines.
Reason (R): There are many excited energy levels available.
→
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.
→
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.
→
Assertion (A): Acetylene is acidic in nature.
Reason (R): Acetylene is sp hybridised.
→
Assertion (A): Overlapping in benzene is $sp ^2- sp ^2$ type.
Reason (R): C-C bond length in benzene is $1.3 \stackrel{\circ}{A}$.
→
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): All isotopes of a given element show the same type of chemical behaviour.
Reason (R): The chemical properties of an atom are controlled by the number of electrons in the atom.
  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.
→
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): An aqueous solution of ammonium acetate can act as a buffer.
Reason (R): Acetic acid is a weak acid and NH4OH is a weak base.
  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 false but R is true.
  4. Both A and R are false.
→
Assertion (A): Both 32 g of $SO _2$ and 8 g of $CH _4$ contain the same number of molecules.
Reason (R): Equal moles of two compounds contain the same number of molecules.
→
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.
→
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 compound cyclooctane has the following structural formula:

It is cyclic and has conjugated $8\pi$-electron system but it is not an aromatic compound.

Reason (R): (4n + 2) $\pi$-electrons rule does not hold good and ring is not planar.

  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.
→