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Chemistry Assertion And Reason.

p-Block Elements – I · Tamil Nadu Board STD 12 (Tamil - English Medium). 10 questions.

Questions

Assertion And Reason.

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10 questions · timed · auto-graded

MCQ 11 Mark
Assertion (A) – Noble gases are least reactivity.
Reason (R) – Noble gases have completely filled s and p-orbital and attain stable electronic configuration.
  • ✓
    A and R are correct and R explains A.
  • B
    A and R are correct and R not explains A.
  • C
    A is correct but R is wrong.
  • D
    A is wrong but R is correct.
Answer
Correct option: A.
A and R are correct and R explains A.
A and R are correct and R explains A.
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MCQ 21 Mark
Assertion (A) – Both boron and silicon form covalent hydrides.
Reason (R) – Boron does not shows diagonal relationship with silicon of group 14.
  • A
    A and R are correct and R explains A.
  • B
    A and R are correct and R not explains A.
  • ✓
    A is correct but R is wrong.
  • D
    A is wrong but R is correct.
Answer
Correct option: C.
A is correct but R is wrong.
A is correct but R is wrong.
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MCQ 31 Mark
Assertion (A) – Fluorine is most reactive element among the halogens.
Reason (R) – Fluorine has minimum bond dissociation energy.
  • ✓
    A and R are correct and R explains A.
  • B
    A and R are correct and R not explains A.
  • C
    A is correct but R is wrong.
  • D
    A is wrong but R is correct.
Answer
Correct option: A.
A and R are correct and R explains A.
A and R are correct and R explains A.
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MCQ 41 Mark
Assertion (A) – Boron combines with halogen to form trihalides at high temperatures.
Reason (R) – Boron does not reacts directly with hydrogen.
  • A
    A and R are correct and R explains A.
  • ✓
    A and R are correct and R not explains A.
  • C
    A is correct but R is wrong.
  • D
    A is wrong but R is correct.
Answer
Correct option: B.
A and R are correct and R not explains A.
A and R are correct and R not explains A.
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MCQ 51 Mark
Assertion (A) – Boron-10 isotope is used as moderator in nuclear reactors.
Reason (R) – Boron has the capacity to absorb neutrons.
  • ✓
    A and R are correct and R explains A.
  • B
    A and R are correct and R not explains A.
  • C
    A is correct but R is wrong.
  • D
    A is wrong but R is correct.
Answer
Correct option: A.
A and R are correct and R explains A.
A and R are correct and R explains A.
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MCQ 61 Mark
Assertion (A) – Diborane is highly reactive.
Reason (R) – At high temperatures, diborane forms higher boranes.
  • A
    A and R are correct and R explains A.
  • ✓
    A and R are correct and R not explains A.
  • C
    A is correct but R is wrong.
  • D
    A is wrong but R is correct.
Answer
Correct option: B.
A and R are correct and R not explains A.
A and R are correct and R not explains A.
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MCQ 71 Mark
Assertion $( A )- BF _3$ reacts with ammonia to form complex.
Reason $(R) - BF _3$ is a electron deficient compound and accepts electron pairs to form coordinate covalent bonds.
  • ✓
    A and R are correct and R explains A.
  • B
    A and R are correct and R not explains A.
  • C
    A is correct but R is wrong.
  • D
    A is wrong but R is correct.
Answer
Correct option: A.
A and R are correct and R explains A.
A and R are correct and R explains A.
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MCQ 81 Mark
Assertion (A) – Fullerene has aromatic character.
Reason (R) – Some of the fullerenes have e-bonds and delocalised n-bonds.
  • ✓
    A and R are correct and R explains A.
  • B
    A and R are correct and R not explains A.
  • C
    A is correct but R is wrong.
  • D
    A is wrong but R is correct.
Answer
Correct option: A.
A and R are correct and R explains A.
A and R are correct and R explains A.
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MCQ 91 Mark
Assertion (A) – Carbon dioxide is non flammable gas.
Reason $(R)- CO _2$ critical temperature is $31^{\circ} C$ and can be readily liquefied.
  • A
    A and R are correct and R explains A.
  • ✓
    A and R are correct and R not explains A.
  • C
    A is correct but R is wrong.
  • D
    A is wrong but R is correct.
Answer
Correct option: B.
A and R are correct and R not explains A.
A and R are correct and R not explains A.
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MCQ 101 Mark
Assertion (A) – Zeolites act as a molecular sieve.
Reason (R) – Zeolite structure is pore/ channel sizes are nearly uniform.
  • ✓
    A and R are correct and R explains A.
  • B
    A and R are correct and R not explains A.
  • C
    A is correct but R is wrong.
  • D
    A is wrong but R is correct.
Answer
Correct option: A.
A and R are correct and R explains A.
A and R are correct and R explains A.
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