Match the properties given in list-I with the metals given in list-II
|
List-I Property |
List-II Metal |
|
(A) Element with highest second ionization enthalpy |
(I) Co |
|
(B) Element with highest heat of atomisation |
(II) Cu |
|
(C) M in $M(CO)_6$ |
(III) Zn |
|
(D) Element with highest third ionization enthalpy |
(IV) Cr |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → (A)-(II), (B)-(I), (C)-(IV), (D)-(III)
|
List-I Property |
List-II Metal |
|
(A) Element with highest second ionization enthalpy |
(II) Cu |
|
(B) Element with highest heat of atomisation |
(I) Co |
|
(C) M in $M(CO)_6$ |
(IV) Cr |
|
(D) Element with highest third ionization enthalpy |
(III) Zn |
(A) Element with highest second ionization enthalpy → (II) Cu
Copper has configuration 3d¹⁰ 4s¹. After losing one electron it becomes 3d¹⁰ (fully filled and very stable). Removing the second electron breaks this stability, so second ionization enthalpy is very high.
(B) Element with highest heat of atomisation → (I) Co
Cobalt has strong metal–metal bonding due to effective overlap of d-orbitals, giving high heat of atomisation among the given options.
(C) M in M(CO)₆ → (IV) Cr
Cr(CO)₆ (Chromium hexacarbonyl) is a well-known stable metal carbonyl compound.
(D) Element with highest third ionization enthalpy → (III) Zn
Zinc has configuration 3d¹⁰ 4s². After losing two electrons it becomes 3d¹⁰ (very stable). Removing the third electron requires breaking this filled d-subshell, so third ionization enthalpy is highest.