JU Admission Test 2016-2017 (Unit-D, Set-3)

$\mathrm{Zn}^{2+}:[\mathrm{Ar}] 3 \mathrm{~d}^{10}$

$\mathrm{Ni}^{2+}:[\mathrm{Ar}] 3 \mathrm{~d}^{6} 4 \mathrm{~s}^{2}$

$\mathrm{Fe}^{2+}:[\mathrm{Ar}] 3 \mathrm{~d} 4 \mathrm{~s}^{2}$

$\mathrm{Cu}^{2+}:[\mathrm{Ar}] 3 \mathrm{~d}^{8} 4 \mathrm{~s}^{1}$

$S_{N} 2$

$S_{N} 1$

$\mathrm{R}-\mathrm{Mg}-\mathrm{X}$

all

1M

0.5 M

0.25M

0.5N

1 ml

2 ml

3 ml

4 ml

no DNA

variation occurs

transfusion occurs

permanent parasite