1
NEET 2023 Manipur
MCQ (Single Correct Answer)
+4
-1

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : Ionisation enthalpy increases along each series of the transition elements from left to right. However, small variations occur.

Reason (R) : There is corresponding increase in nuclear charge which accompanies the filling of electrons in the inner d-orbitals.

In the light of the above statements, choose the most appropriate answer from the options given below :

A
(A) is correct but (R) is not correct.
B
(A) is not correct but (R) is correct.
C
Both (A) and (R) are correct and (R) is the correct explanation of (A).
D
Both (A) and (R) are correct but (R) is not the correct explanation of (A).
2
NEET 2023 Manipur
MCQ (Single Correct Answer)
+4
-1

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : Ionisation enthalpies of early actinoids are lower than for early lanthanoids.

Reason (R) : Electrons are entering 5f orbitals in actinoids which experience greater shielding from nuclear charge.

In the light of the above statements, choose the correct answer from the options given below :

A
(A) is true but (R) is false.
B
(A) is false but (R) is true.
C
Both (A) and (R) are true and (R) is the correct explanation of (A).
D
Both (A) and (R) are true but (R) is not the correct explanation of (A).
3
NEET 2023
MCQ (Single Correct Answer)
+4
-1

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A : Helium is used to dilute oxygen in diving apparatus.

Reason R : Helium has high solubility in O$$_2$$.

In the light of the above statements, choose the correct answer from the options given below:

A
Both A and R are true but R is NOT the correct explanation of A.
B
A is true but R is false.
C
A is false but R is true.
D
Both A and R are true and R is the correct explanation of A.
4
NEET 2023
MCQ (Single Correct Answer)
+4
-1

The stability of $$\mathrm{Cu}^{2+}$$ is more than $$\mathrm{Cu}^{+}$$ salts in aqueous solution due to -

A
enthalpy of atomization.
B
hydration energy.
C
second ionisation enthalpy.
D
first ionisation enthalpy.
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