Q12. Match List - I with List - II.
List - I
(A) Element with highest second ionization enthalpy
(B)

Q: What is the correct answer for CUET UG Chemistry Q12?

The correct answer is D. A. Cu (Copper) has a [Ar]3d104s1 configuration. Cu+ ([Ar]3d10) has a fully filled d-orbital. Removing a second electron from a stable, fully filled d10 configuration requires high energy. Thus, Cu has the highest second ionization enthalpy. So (A) -> (III).B. Zn (Zinc) has a [Ar]3d104s2 configuration. Zn2+ ([Ar]3d10) has a fully filled d-orbital. Removing a third electron from this stable configur

Q: Q12. Match List - I with List - II. List - I (A) Element with highest second ionization enthalpy (B) Element with highest third ionization enthalpy (C) M in M(CO)x is (D) Element with highest heat of…

The correct answer is D. A. Cu (Copper) has a [Ar]3d104s1 configuration. Cu+ ([Ar]3d10) has a fully filled d-orbital. Removing a second electron from a stable, fully filled d10 configuration requires high energy. Thus, Cu has the highest second ionization enthalpy. So (A) -> (III).B. Zn (Zinc) has a [Ar]3d104s2 configuration. Zn2+ ([Ar]3d10) has a fully filled d-orbital. Removing a third electron from this stable configur

Q: What are the options for this CUET UG Chemistry question?

A. (a) (A)-(I), (B)-(II), (C)-(III), (D)-(IV) · B. (b) (A)-(IV), (B)-(III), (C)-(II), (D)-(I) · C. (c) (A)-(II), (B)-(III), (C)-(I), (D)-(IV) · D. (d) (A)-(III), (B)-(IV), (C)-(II), (D)-(I)

Question

Q12. Match List - I with List - II.
List - I
(A) Element with highest second ionization enthalpy
(B) Element with highest third ionization enthalpy
(C) M in M(CO)x is
(D) Element with highest heat of atomization
List - II
(I) Co
(II) Cr
(III) Cu
(IV) Zn
Choose the correct answer from the options given below:
(a) (A)-(I), (B)-(II), (C)-(III), (D)-(IV)
(b) (A)-(IV), (B)-(III), (C)-(II), (D)-(I)
(c) (A)-(II), (B)-(III), (C)-(I), (D)-(IV)
(d) (A)-(III), (B)-(IV), (C)-(II), (D)-(I)

FirstInTest · Accepted Answer

A. Cu (Copper) has a [Ar]3d104s1 configuration. Cu+ ([Ar]3d10) has a fully filled d-orbital. Removing a second electron from a stable, fully filled d10 configuration requires high energy. Thus, Cu has the highest second ionization enthalpy. So (A) -> (III).B. Zn (Zinc) has a [Ar]3d104s2 configuration. Zn2+ ([Ar]3d10) has a fully filled d-orbital. Removing a third electron from this stable configuration requires very high energy. Thus, Zn has the highest third ionization enthalpy. So (B) -> (IV).C. For M(CO)x to be a stable complex, M often follows the 18-electron rule. [Cr(CO)6] has Cr in 0 oxidation state (6 valence electrons) + 6*2 (from CO) = 18 electrons. So M is Cr. So (C) -> (II).D. Heat of atomization is related to the strength of metallic bonding, which depends on the number of unpaired electrons. Co has 3d74s2 configuration, leading to 3 unpaired electrons in d-orbitals in its ground state or more in certain excited/oxidized states. Cobalt typically has a high heat of atomization due to strong metallic bonding. So (D) -> (I).Therefore, the correct match is (A)-(III), (B)-(IV), (C)-(II), (D)-(I).

Answer

(a) (A)-(I), (B)-(II), (C)-(III), (D)-(IV)

Answer

(b) (A)-(IV), (B)-(III), (C)-(II), (D)-(I)

Answer

(c) (A)-(II), (B)-(III), (C)-(I), (D)-(IV)

Answer

(d) (A)-(III), (B)-(IV), (C)-(II), (D)-(I)

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