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Correct (l) very large difference, M. Pt. of Cr is $$1920$$°C and that of Zn is $$420$$°C.The melting points depends on the occupancy of the bonding and $$anti-bonding$$ $$-$$ molecular orbitals higher occupancy low M, Pt. Cr $$=$$ $$3d5$$,$$4S1$$. Energy of $$3d$$ and $$4s$$ are very close to each other and bands of $$3s$$ and $$4s$$ overlap. The composite band which can accommodate $$12$$ valence $$e-$$'s metal atom will be half filled for Cr and completely filled for Zn.(2) In Cr, due to $$5$$ unpaired $$e-$$'s, interatomic bonding is very strong, hence hard metal. In Hg, $$3d$$ subshell is fllled to the maximum capacity (5d10$$ $$6S2), these $$e-$$'s are not available for interatomic bonding and thus, bonding is very weak, hence Hg is a liquid at room temperature. Alternatively, if $$5d$$ and $$6s$$ bands overlap, the composite band can accommodate $$12$$ valence e 's metal atom. Both bonding and $$anti-bonding$$ are occupied in Hg and thus weak bonding and low M. Pt. (3) Sum of $$IE1+IE2+IE3+IE4$$ energies for Pt is lower than Ni.  (4) Sum of $$IE1+IE2$$ energies for Ni is lower than for Pt.

	Column I		Column II
a.	Ni	p.	Elements having same number of unpaired electron in their dispositive in column I
b.	Na	q.	At least 13 electrons are having magnetic quantum number 'zero'
c.	Mn	r.	Atom is paramagnetic
d.	Pd	s.	Element is not transition element
		t.	Element having pseudo inert gas configuration in its dispositive cation

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