Assertion (A) & Reason (B) MCQ

MCQ 11 Mark

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.

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MCQ 21 Mark

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.

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: Splitting of the spectral lines in the presence of a magnetic field is known as the Zeeman effect and in an electric field is known as the Stark effect. The splitting of spectral lines is due to different orientations which the orbitals can have in the presence of the magnetic field.

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MCQ 31 Mark

Assertion (A): Trans-2-butene on reaction with $Br _2$ gives a meso-2,3-dibromobutane.
Reason (R): The reaction involves the syn-addition of bromine.

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: With trans-2-butene, the product of $Br _2$ addition is optically inactive due to the formation of symmetric meso compounds.

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MCQ 41 Mark

Assertion (A): Sulphur present in an organic compound can be estimated quantitatively by Carius method.
Reason (R): Sulphur can be separated easily from other atoms in the molecule, by lassiagn's test, but the yellow precipitate cannot be obtained.

A
A is correct and R is not correct.
B
Both A and R are correct and R is the correct explanation of A.
C
Both A and R are correct but R is not the correct explanation of A.
✓
A is not correct but R is correct.

Answer

Correct option: D.

A is not correct but R is correct.

(d) A is not correct but R is correct.
Explanation: We know that the Carius method is used to estimate the halogen quantity, hence assertion is found to be wrong. Now reason, Sulphur can be separated easily from other atoms in the molecule, by lassiagn's test, but the yellow precipitate cannot be obtained.

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Chemistry Assertion (A) & Reason (B) MCQ

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