Match the entries of column I with appro

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Target Exam

CUET

Subject

Chemistry

Chapter

Inorganic: D and F Block Elements

Question:

Match the entries of column I with appropriate entries of column II and choose the correct option out of the four options given.

Column I (Property)	Column II (Metal)
(i) Element with highest second ionisation enthalpy	(a) Cr
(ii) Element with highest third ionisation enthalpy	(b) Cu
(iii) M in M(CO)₆ is	(c) Zn
(iv) Element with highest heat of atomisation	(d) Ni

Options:

(i)-(c), (ii)-(b), (iii)-(d), (iv)-(a)

(i)-(d), (ii)-(a), (iii)-(c), (iv)-(b)

(i)-(b), (ii)-(c), (iii)-(a), (iv)-(d)

(i)-(a), (ii)-(b), (iii)-(c), (iv)-(d)

Correct Answer:

(i)-(b), (ii)-(c), (iii)-(a), (iv)-(d)

Explanation:

(i) Cu⁺: [Ar]3d¹⁰, which is very stable configuration. Hence, removal of 2nd electron requires very high energy.

(ii) Zn²⁺: [Ar]3d¹⁰ Hence, removal of 3^rd electron requires very high energy.

(iii) Metal carbonyl with formula M(CO)₆ is Cr(CO)₆.

(iv) Ni has highest enthalpy of atomisation.