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Chemistry Assertion (A) & Reason (B) MCQ

Model Paper 8 · 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): Molarity of a solution represents its concentration.
Reason (R): Molarity is the number of moles of solute per litre of solution.
  • ✓
    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: Concentration means how much amount of substance is present in a given volume of a solution. Now as amount can be measured in terms of moles, so molarity means concentration of the solution. According to Mole concept: 1 Mole of molecules $=$ Gram molecular mass $=6.023 \times 10^{23}$ molecules.
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MCQ 21 Mark
Assertion (A): Energy of radiation is large if its wavelength is large.
Reason (R): Energy $= h \nu\left(\nu=\right.$ frequency, $\left.\nu=\frac{c}{\lambda}\right)$
  • 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: Energy of radiation is small if its wavelength is large
 $\because E =\frac{h c}{\lambda}$ (inverse relationship between E and $\lambda$ ).
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MCQ 31 Mark
Assertion (A): Ozonolysis of alkynes are faster than ozonolysis of alkenes.
Reason (R): Reaction proceed by cyclic transition state are faster on alkynes.
  • ✓
    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 A and R are true and R is the correct explanation of A .
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MCQ 41 Mark
Assertion (A): Electron deficient species that can accept lone pair of electrons known as an electrophile.
Reason (R): $\stackrel{\oplus}{N} H_4$ is an electrophile.
  • 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: A is true but R is false.
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