Ncert Exercises & Solutions

Match the properties given in Column I with the metals given in Column II and mark the appropriate answer.

Column I (Property)	Column II (Metal)
A. Element with highest second ionisation enthalpy	i. Co ii. Cr
B. Element with highest third ionisation enthalpy	iii. Cu
C. M in M(CO $)_{6}$ is	iv. Zn
D. Element with highest heat of atomisation	v. Ni

1. A = v; B = ii; C = i; D = iv

2. A = iv; B = ii; C = i; D = v

3. A = iii; B = iv; C = ii; D = v

4. A = ii; B = iv; C = iii; D = v

Hint: Zn has the third highest ionization energy

A.

C u^{+} = 3 d^{10}

which is a very stable configuration due to fully-filled orbitals. Hence, the removal of the second electron requires very high energy. The ionization values For Cu are
as follows:

$\Delta H_{1} \ and \ \Delta H_{2}$ are 745 kJ mol^-1 and 1958 kJ mol^-1

B.

Z n^{2 +} = 3 d^{10}

which is a very stable configuration. Hence, the removal of the third electron requires very high energy.

The ionization values of Zn are as follows:

$\Delta H_{1} \ \Delta H_{2} \ and \ \Delta H_{3}$ are 906 kJ mol^-1, 1734 kJ mol^-1, and 3837 kJ mol^-1

C. Metal carbonyl with formula

M {(C O)}_{6} i s C r {(C O)}_{6}

D. Nickel is the element with the highest heat of atomization.

The values are as follows:
Co = 425 kJ mol^-1
Cr = 397 kJ mol^-1
Ni = 430 kJ mol^-1
Zn = 126 kJ mol^-1
Cu = 339 kJ mol^-1

Hence, option third is the correct answer.

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