CBSE Questions for Class 12 Engineering Chemistry The D-And F-Block Elements Quiz 2 - MCQExams.com

The adsorption of hydrogen by platinum black is called :
  • hydrogenation
  • Reduction
  • Occlusion
  • Hydration
Transition metals show paramagnetism 
  • due to characteristic configuration
  • high lattice energy
  • due to variable oxidation states
  • due to unpaired electrons
Among the following metals, interatomic forces are probably the weakest in :
  • $$Cu$$
  • $$Ag$$
  • $$Zn$$
  • $$Hg$$
Among the following which exhibits hydrogen, covalent, and coordinate bonding?
  • $$ MnSO_4 . 4H_2 O $$
  • $$ CuSO_4 . 5H_2 O $$
  • $$ FeSO_4 . 6H_2 O $$
  • $$ FeSO_4. 5H_2 O $$
The approximate size of the nucleus of $$_{28}^{64}Ni$$ is:
  • 3 fm
  • 4 fm
  • 5 fm
  • 2 fm
In $${Cr_{2}O_{7}}^{2-}$$ ion, the maximum number of bonds having the same Cr - O bond length is :
  • 5
  • 4
  • 6
  • 3
Match the List $$I$$ with List $$II$$ and List $$III$$
List $$I$$List $$II$$List $$III$$
a. Reductioni. Adam's catalyst$$TiCl_4$$
b. Polythene productionii. Wacker process$$Pt$$
c. Aldehyde manufactureiii. Natta catalyst $$PbCl_2$$
  • $$a\to i \to 2$$
  • $$b\to ii \to 1$$
  • $$c\to iii\to 3$$
  • none
Which among the following ions has maximum value of magnetic moment?
  • $$Cu^{2+}$$
  • $$Mn^{2+}$$
  • $$Cr^{2+}$$
  • $$Ti^{2+}$$
Which of the following ions is paramagnetic?
  • $$ Cu^+ $$
  • $$ Zn^{2+} $$
  • $$ Ti^{3+} $$
  • $$ Ti^{4+} $$
The dark red colour of bombs in fireworks is due to the presence of  
  • $$Na$$
  • $$Ba$$
  • $$Sr$$
  • $$K$$
Which ion has maximum magnetic moment?
  • $$ V^{3+} $$
  • $$ Mn^{3+} $$
  • $$ Fe^{3+} $$
  • $$ Cu^{2+} $$
Chromate and dichromate ions are:
  • $$CrO_{4}^{2-}$$ and $$Cr_{2} O_{7}^{2-}$$
  • $$Cr_{2} O_{7}^{2-}$$ and $$CrO_{4}^{2-}$$
  • $$CrO_{4}^{2-}$$ and $$Cr_{2}O_{5}^{2-}$$
  • $$Cr_{2}O_{5}^{2-}$$ and $$CrO_{4}^{2-}$$
Which one of the following shows highest magnetic moment?
  • $${Fe}^{2+}$$
  • $$C{o}^{2+}$$
  • $${Cr}^{3+}$$
  • $${Ni}^{2+}$$
Which one of the following elements forms compounds that are all coloured?
  • Magnesium
  • Aluminium
  • Iron
  • Chromium
Which of the following statements is not correct about magnetic behaviour of substances?
  • Diamagnetic substances are repelled by an applied magnetic field.
  • Paramagnetic substances are attracted by an applied magnetic field.
  • Magnetic moment of n unpaired electrons is given by $$\mu=\sqrt n(n-2)$$B.M.
  • Magnetic moment increases as the number of unpaired electrons increases.
Which of the following complexes is diamagnetic? 
  • $$Ni(CO)_4$$
  • $$Ni(Cl_4)^{2-}$$
  • $$Ni(Br)_4^{2-}$$
  • $$NiCl_2.4H_2O$$
A solution when treated with dimethyl glyoxime and $$NH_4OH$$ gives a rose red complex. The metal present is
  • $$Ni$$
  • $$V$$
  • $$Co$$
  • $$Mn$$
Which of the following has diamagnetic character? 
  • $$[ NiCl_4]^{2-} $$
  • $$ [ CoF_6]^{3-} $$
  • $$ [Fe(H_2O)_6 ]^{2+} $$
  • $$ [Ni (CN)_4]^{2-} $$
Wilkinson's catalyst used as a homogeneous catalyst in the hydrogenation of alkaline contains
  • Iron
  • Aluminium
  • Rhodium
  • Cobalt
Reagent (E) is:
1768756_617ffa01f4824981af9efee7c1aede74.png
  • $$LAH$$
  • $$NaBH_4$$
  • $$H_2 / Ni$$
  • $$K + liq. NH_3$$ in $$EtOH$$
Ziegler-Natta catalysts
  • Are triethyl aluminium titanium tetrachloride complex$$(C_2H_3)Al + TiCl_4.$$
  • Are used to prepare stereospecific addition polymers
  • Are employed to have stereochemical control of the polymerisation process.
  • All the above
Which of the following paramagnetic ions would exhibit magnetic moment (Spin only) of the order 5 BM? (Atomic number Mn = 25, Cr = 24, V = 23, Ti = 22)
  • $$V^{2+}$$
  • $$Ti^{2+}$$
  • $$Mn^{+2}$$
  • $$Cr^{2+}$$
The ratio of number of exchange pairs present in $$d^{9}$$ and magnetic moment of Cr in B.M. is:-
  • $$\frac{2}{\sqrt{3}}$$
  • $$\frac{2\sqrt{3}}{3}$$
  • $$\frac{2\sqrt{3}}{4}$$
  • $$\frac{16}{\sqrt{35}}$$
Which of the following can convert acidified $${ Cr }_{ 2 }{ O }_{ 7 }{^{2-}}$$ to green product?
  • $${ SO }_{ 2 },{ H }_{ 2 }{ SO }_{ 3 }$$ and $${ H }_{ 2 }{ SO }_{ 4 }$$
  • $${ SO }_{ 2 },{ H }_{ 2 }{ S }_{ }$$ and $${ H }_{ 2 }{ SO }_{ 3 }$$
  • $${ SO }_{ 3 },{ H }_{ 2 }{ S }$$ and $${ Fe }^{ 3+ }$$
  • $${ SO }_{ 3 }^{ - },{ H }_{ 2 }S$$ and $${ Fe }^{ +2 }$$
Amongst the following ions, which is considered as most stable in $${ M }^{ 2+ }$$ state?
  • $${ Ti }^{ 2+ }/Ti\left( -1.63V \right) $$
  • $${ V }^{ 2+ }/V\left( -1.11V \right) $$
  • $${ Cr }^{ 2+ }/Cr\left( -0.90V \right) $$
  • $${ Mn }^{ 2+ }/Mn\left( 1.18V \right) $$
The pair having similar magnetic moment is:
  • $$Ti^{3+},V^{3+}$$
  • $$Cr^{3+},Mn^{3+}$$
  • $$Mn^{2+},Fe^{3+}$$
  • $$Ti^{2+},Mn^{2+}$$
Atomic number of three elements A, B, and C are respectively, 

     $$Pm\ (Z=61),\ Sm\ (Z=62),\ Eu\ (Z=63).$$
    
Which one has a maximum atomic radius?
  • A
  • B
  • C
  • All have the same radius
Which of the following pairs of atom have the most similar radii ?
  • $$Zr, Hf$$
  • $$Cu, Ag$$
  • $$Sc, Ti$$
  • $$Pd, Pt$$
Which of the following will be paramagnetic?
  • $$O_{2}^{2-}$$
  • $$Cr^{3+}$$
  • $$Na^{+}$$
  • $$Cu^{+}$$
Which of the following factors may be regarded as the main cause of lanthanide contraction? 
  • Poor shielding of one of 4f electron by another in the subshell
  • Effective shielding of one of 4f electrons by another in the subshell.
  • Poorer shielding of 5d electrons by 4f electrons
  • Greater shielding of 5d electrons by 4f electrons
Which of the following ions in its aqueous solution possesses the value of magnetic moment as $$3.87$$?
  • $$Cu^{2+}$$
  • $$Cu^{3+}$$
  • $$Co^{3+}$$
  • $$Fe^{3+}$$
Which of the following ion will give colourless aqueous solution ?  
  • $$Ni^{2+}$$
  • $$Sc^{3+}$$
  • $$Cu^{2+}$$
  • $$Mn^{3+}$$

Transition metals are good electrical conductor because ___________.
  • they are metals
  • they are solids
  • they have free electrons in outer energy levels
  • they are hard

Transition metals are often para magnetic owing to ____________.
  • high melting point and boiling point
  • the presence of vacant orbitals
  • the presence of unpaired electrons
  • malleability and ductility
Wilkinson's catalyst is :
  • $$TiCl_4$$ and $$Al(C_2H_5)_3$$
  • $$[(Ph_3P)_3RhCl]$$
  • $$TiCl_4$$ and $$(C_6H_5)_3P$$
  • $$none\ of\ these$$
Among the following, the lowest degree of paramagnetism per mole of the compound will be shown by:
  • $$MnSO_4. 4H_2O$$
  • $$CuSO_4. 5H_2O$$
  • $$FeSO_4. 7H_2O$$
  • $$NiSO_4. 6H_2O$$
Which is a coloured ion?
  • $$[Cr(H_2O)_6]^{3+}$$
  • $$[Cu(CN)_4]^{3-}$$
  • $$[Ti(H_2O)_6]^{4+}$$
  • $$[Sc(H_2O)_6]^{3+}$$
In $$3d$$ series, the maximum magnetic moment is shown by:
  • $$Sc (At\ no.\ 21)$$
  • $$V(23)$$
  • $$Cr(24)$$
  • $$Fe(26)$$
Select the correct statement:
  • Colour of the transition metal ion arises due to $$d-d$$ transition
  • Colour certain oxysalts of transition metals is due to charge transfer
  • Both are correct
  • None is correct
$$ Fe^{2+} $$ does not give prussian blue colour with $$ Fe^{2+} $$, but on its reaction with (x), prussian blue colur appears with the reagent (x) is
  • $$ MnO_{4}-/H^{+} $$
  • $$ H_{2}SO_{4} $$
  • $$ NH_{3} $$
  • All true
Which amongst the following metal carbonyls are inner orbital complexes with diamagnetic property?
  • $$ Ni(CO)_{4} $$
  • $$ Fe(CO)_{5} $$
  • $$ V(CO)_{6} $$
  • $$Cr(CO)_{6} $$
Which of the following ions gives coloured solution? 
  • $$ Cu^+ $$
  • $$ Zn^{2+} $$
  • $$ Ag^+ $$
  • $$ Fe^{2+} $$
Which one of the following statements about lanthanides is false ?
  • Lanthanides are seperated from one another by ion exchange method
  • The ionic radii of trivalent lanthanides steadily increases with increase in atomic number
  • All lanthanides are highly dense metals
  • Most typical oxidation state of lanthanides is +3
What would be magnetic moment of $$Gd^{+3}$$ ($$Z = 64$$)?
  • 7.9 BM
  • 3.62 BM
  • 10.60 BM
  • 9.72 BM
The position in the periodic table to which $$Fe$$ and $$Zn$$ elements belong to __________ .
  • Alkali metal
  • Alkaline earth metal
  • d-block
  • None of these
The catalytic activity of the transition metals and their compounds is described to their 
  • chemical reactivity
  • magnetic behaviour
  • unfilled d-orbitals
  • ability to adopt multiple oxidation states and their complexing ability
The transition metal used as a catalyst is:
  • Nickel
  • Platinum
  • Cobalt
  • All of these
Which of the following transition metal is used as a catalyst? 
  • Nickel
  • Cobalt
  • Gold
  • Both (A) and (B)
Which of the following will show increase in weight when kept in magnetic field? 
  • $$ TiO_2 $$
  • $$ Fe_2(SO_4)_3 $$
  • $$ KMnO_4 $$
  • $$ ScCl_3 $$
$$ V_2O_5 $$ is useful as catalyst in 
  • manufacturing of $$ H_2SO_4 $$
  • manufacturing of $$ HNO_3 $$
  • manufacturing of $$ Na_2CO_3 $$
  • it is not a catalyst
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