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Chemistry Assertion (A) & Reason (B) MCQ

Model Paper 1 · Gujarat Board (GSEB) STD 11 Science (GSEB - English Medium). 4 questions.

Questions

Assertion (A) & Reason (B) MCQ

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4 questions · auto-graded multiple-choice test.

MCQ 11 Mark
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.
  • ✓
    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: Both $SO _2$ and $CH _4$ represent 0.5 g mole have a same number of molecules.
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MCQ 21 Mark
Assertion: A spectral line will be seen for a $2 p_x \rightarrow 2 p_y$ transition.
Reason: Energy is released in the form of waves of light when the electron drops from $2 p_{ v }$ to 2 p orbital.
  • A
    If both Assertion & Reason are true and the reason is the correct explanation of the assertion.
  • B
    If both Assertion & Reason are true but the reason is not the correct explanation of the assertion.
  • C
    If Assertion is true statement but Reason is false.
  • ✓
    If both Assertion and Reason are false statements.
Answer
Correct option: D.
If both Assertion and Reason are false statements.
(d) If both Assertion and Reason are false statements.
Explanation: No transition can take place between $2 p _{ x } \rightarrow 2 p _{ y }$ as $2 p _{ x }$ to $2 p _{ y }$ are degenerate orbitals.
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MCQ 31 Mark
Assertion (A): $C _6 H _5 F$ gives large amount of nitration products than all the other halides
Reason (R): $F$ is most electronegative.
  • 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: Halogens deactivate benzene ring for further substitution due to inductive effect of halide groups. The negative inductive effect of F in halogens being maximum and thus deactivating nature in halogens is maximum for F . Thus nitration of $C _6 H _5 F$ shows poor yield.
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MCQ 41 Mark
Assertion (A): The term tautomerism was introduced by Maxwell in order to explain the chemical reactivity of a substance according to two possible structures.
Reason (R): Metamers can also be chain isomers or position isomers.
  • 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.
  • ✓
    A is true but R is false.
  • D
    A is false but R is true.
Answer
Correct option: C.
A is true but R is false.
(c) A is true but R is false.
Explanation: Metamers differ in the nature of alkyl groups attached to the same functional group. e.g. $CH _3- O - C _3 H _7$ (Methyl propyl ether ), $C _2 H _5- O - C _2 H _5$ (Diethyl ether)
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