Assertion And Reason.

MCQ 11 Mark

Assertion (A) – Xenon is used in high speed electronic flash bulbs used by photographers.
Reason (R) – Xenon emits an intense light in discharge tubes instantly.

✓
A and R are correct and R explains A
B
A and R are correct but doesn’t 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

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MCQ 21 Mark

Assertion (A) – Noble gases have the largest ionisation energy compared to any other elements.
Reason (R) – Noble gases have incomplete filled orbital.

A
A and R are correct and R explains A
B
A and R are correct but doesn’t 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

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MCQ 31 Mark

Assertion (A) - Hydrogen iodide decomposes at $400^{\circ} C$ while hydrogen fluoride and hydrogen chloride are stable at this temperature.
Reason (R) – Thermal stability of hydrogen halides decreases from fluoride to iodide.

✓
A and R are correct and R explains A
B
A and R are correct but doesn’t 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

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MCQ 41 Mark

Assertion (A) – The bleaching of chlorine is temporary.
Reason (R) – Chlorine oxidises ferrous salts to ferric salts.

A
A and R are correct and R explains A
B
A and R are correct but doesn’t explains A
C
A is correct but R is wrong
✓
A is wrong but R is correct

Answer

Correct option: D.

A is wrong but R is correct

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MCQ 51 Mark

Assertion (A) – Sulphuric acid is highly reactive.
Reason (R) – Sulphuric acid can act as strong acid and an oxidising agent.

A
A and R are correct and R explains A
✓
A and R are correct but doesn’t 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 but doesn’t explains A

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MCQ 61 Mark

Assertion (A) – Sulphuric acid is a high boiling point and viscous liquid.
Reason (R) – This is due to the association of molecules together through hydrogen bonding.

✓
A and R are correct and R explains A
B
A and R are correct but doesn’t 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

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MCQ 71 Mark

Assertion (A) – Monoclinic sulphur is less stable than rhombic sulphur.
Reason (R) – Monoclinic sulphur is stable between 96°C – 119°C and slowly changes into rhombic sulphur.

✓
A and R are correct and R explains A
B
A and R are correct but doesn’t 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

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MCQ 81 Mark

Assertion (A) – Nitrogen gas is chemically inert.
Reason (R) – Nitrogen has low bonding energy.

A
A and R are correct and R explains A
B
A and R are correct but doesn’t 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

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MCQ 91 Mark

Assertion: bond dissociation energy of fluorine is greater than chlorine gas
Reason: chlorine has more electronic repulsion than fluorine

A
Both assertion and reason are true and reason is the correct explanation of assertion.
B
Both assertion and reason are true but reason is not the correct explanation of assertion.
C
Assertion is true but reason is false.
✓
Both assertion and reason are false.

Answer

Correct option: D.

Both assertion and reason are false.

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Chemistry Assertion And Reason.

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