311. Nickel $$\left( {Z = 28} \right)$$ combines with a uninegative monodentate ligand $${X^ - }$$ to form a paramagnetic complex $${\left[ {Ni{X_4}} \right]^{2 - }}.$$ The number of unpaired electron(s) in the nickel and geometry of this complex ion are, respectively :
A
one, square planar
B
two, square planar
C
one, tetrahedral
D
two, tetrahedral
Answer :
two, tetrahedral
312. According to Werner's theory of coordination compounds
A
primary valency is ionisable
B
secondary valency is ionisable
C
primary and secondary valencies are ionisable
D
neither primary nor secondary valency is ionisable
Answer :
primary valency is ionisable
313. Amongst $$Ni{\left( {CO} \right)_4},{\left[ {Ni{{\left( {CN} \right)}_4}} \right]^{2 - }}{\text{and}}\,NiCl_4^{2 - }$$
A
$$Ni{\left( {CO} \right)_4}\,{\text{and}}\,NiCl_4^{2 - }$$ are diamagnetic and $${\left[ {Ni{{\left( {CN} \right)}_4}} \right]^{2 - }}$$ is paramagnetic
B
$$NiCl_4^{2 - }\,{\text{and}}\,{\left[ {Ni{{\left( {CN} \right)}_4}} \right]^{2 - }}$$ are diamagnetic and $$Ni{\left( {CO} \right)_4}$$ is paramagnetic
C
$$Ni{\left( {CO} \right)_4}\,{\text{and}}\,{\left[ {Ni{{\left( {CN} \right)}_4}} \right]^{2 - }}$$ are diamagnetic and $$NiCl_4^{2 - }$$ is paramagnetic
D
$$Ni{\left( {CO} \right)_4}$$ is diamagnetic and $$NiCl_4^{2 - }\,{\text{and}}\,{\left[ {Ni{{\left( {CN} \right)}_4}} \right]^{2 - }}$$ are paramagnetic
Answer :
$$Ni{\left( {CO} \right)_4}\,{\text{and}}\,{\left[ {Ni{{\left( {CN} \right)}_4}} \right]^{2 - }}$$ are diamagnetic and $$NiCl_4^{2 - }$$ is paramagnetic
314. Among the following compounds which one is both paramagnetic and coloured?
A
$${K_2}C{r_2}{O_7}$$
B
$$\left[ {Co\left( {S{O_4}} \right)} \right]$$
C
$${\left( {N{H_4}} \right)_2}\left[ {TiC{l_6}} \right]$$
D
$${K_3}\left[ {Cu{{\left( {CN} \right)}_4}} \right]$$
Answer :
$$\left[ {Co\left( {S{O_4}} \right)} \right]$$
315. Pick a poor electrolytic conductor complex in solution
A
$${K_2}\left[ {PtC{l_6}} \right]$$
B
$$\left[ {Co{{\left( {N{H_3}} \right)}_3}} \right]{\left( {N{O_2}} \right)_3}$$
C
$${K_4}\left[ {Fe{{\left( {CN} \right)}_6}} \right]$$
D
$$\left[ {Co{{\left( {N{H_3}} \right)}_4}} \right]S{O_4}$$
Answer :
$$\left[ {Co{{\left( {N{H_3}} \right)}_4}} \right]S{O_4}$$
316. $$\left[ {Cr{{\left( {{H_2}O} \right)}_6}} \right]C{l_3}$$ ( at. no. of $$Cr=24$$ ) has a magnetic moment of $$3.83\,BM,$$ the correct distribution of $$3d$$ electrons in the chromium of the complex is
A
$$3d_{xy}^1,3d_{yz}^1,3d_{{z^2}}^1$$
B
$$3{d_{\left( {{x^2} - {y^2}} \right)}},3d_{{z^2}}^1,3d_{xz}^1$$
C
$$3{d_{xy}},3{d_{\left( {{x^2} - {y^2}} \right)}},3d_{yz}^1$$
D
$$3d_{xy}^1,3d_{yz}^1,3d_{zx}^1$$
Answer :
$$3d_{xy}^1,3d_{yz}^1,3d_{zx}^1$$
317. The $$CFSE$$ for octahedral $${\left[ {CoC{l_6}} \right]^{4 - }}$$ is $$18,000\,c{m^{ - 1}}.$$ The $$CFSE$$ for tetrahedral $${\left[ {CoC{l_4}} \right]^{2 - }}$$ will be
A
$$18,000\,c{m^{ - 1}}$$
B
$$16,000\,c{m^{ - 1}}$$
C
$$8,000\,c{m^{ - 1}}$$
D
$$20,000\,c{m^{ - 1}}$$
Answer :
$$8,000\,c{m^{ - 1}}$$
318. The total number of possible isomers for the complex compound $$\left[ {C{u^{{\text{II}}}}{{\left( {N{H_3}} \right)}_4}} \right]\left[ {Pt{\,^{{\text{II}}}}C{l_4}} \right]$$ are
A
5
B
6
C
3
D
4
Answer :
4
319. The ionisation isomer of $$\left[ {Cr{{\left( {{H_2}O} \right)}_4}} \right]Cl\left( {N{O_2}} \right)Cl\,\,{\text{is}}$$
A
$$\left[ {Cr{{\left( {{H_2}O} \right)}_4}\left( {{O_2}N} \right)} \right]C{l_2}$$
B
$$\left[ {Cr{{\left( {{H_2}O} \right)}_4}C{l_2}} \right]\left( {N{O_2}} \right)$$
C
$$\left[ {Cr{{\left( {{H_2}O} \right)}_4}Cl\left( {ONO} \right)} \right]Cl$$
D
$$\left[ {Cr{{\left( {{H_2}O} \right)}_4}C{l_2}\left( {N{O_2}} \right)} \right]{H_2}O$$
Answer :
$$\left[ {Cr{{\left( {{H_2}O} \right)}_4}C{l_2}} \right]\left( {N{O_2}} \right)$$
320. Which of the following complexes will have tetrahedral shape?
A
$${\left[ {PdC{l_4}} \right]^{2 - }}$$
B
$${\left[ {Pd{{\left( {CN} \right)}_4}} \right]^{2 - }}$$
C
$${\left[ {Ni{{\left( {CN} \right)}_4}} \right]^{2 - }}$$
D
$${\left[ {NiC{l_4}} \right]^{2 - }}$$
Answer :
$${\left[ {NiC{l_4}} \right]^{2 - }}$$
