CBSE Questions for Class 12 Engineering Chemistry The D-And F-Block Elements Quiz 10 - MCQExams.com

Among $$d-$$block elements, the most abundant element belongs to :
  • first transition series
  • second transition series
  • third transition series
  • fourth transition series
The correct order of ionic radii of $$Ce, La, Pm$$ and $$Yb$$ in $$+3$$ oxidation state is:
  • $$La^{3+}< Pm^{3+}< Ce^{3+}< Yb^{3+}$$
  • $$La^{3+}< Ce^{3+}< Pm^{3+}< Yb^{3+}$$
  • $$Yb^{3+}< Ce^{3+}< Pm^{3+}< La^{3+}$$
  • $$Yb^{3+}< Pm^{3+}< Ce^{3+}< La^{3+}$$
Transition metals are often paramagnetic owing to 
  • Their high M.P. and B.P
  • The presence of vacant orbitals
  • The presence of one or more unpaired electrons in the system
  • Their being less electropositive than the elements of groups I-A and II-A
Transition elements are coloured
  • Due to small size
  • Due to metallic nature
  • Due to unpaired d - electrons
  • All of these
Which of the following is not the characteristic of transition metals?
  • They are all metals
  • They show variable oxidation states which always differ by two units
  • They are paramagnetic
  • They easily form complex
The property which is not characteristic of transition metals, is: 
  • variable oxidation state
  • tendency to form complex
  • formation of coloured compounds
  • natural radioactivity
The radius of $$ La^{3+} $$ (atomic number of $$La = 57$$) is $$ 1.06 \mathring{A} $$ which one of the following given values will be closest to the radius of $$ Lu^{3+} $$ (atomic number of $$Lu = 71$$)?
  • $$ 1.40 \mathring{A}$$
  • $$ 1.06 \mathring{A}$$
  • $$ 0.85 \mathring{A} $$
  • $$ 1.60 \mathring{A} $$
Ammonia solution dissolves fairly:
  • $$Hg_2Cl_2$$
  • $$PbCl_2$$
  • $$AgI$$
  • $$Cu(OH)_2$$
Which one of the following ions is diamagnetic?
  • $$Cr^{2+}$$
  • $$V^{2+}$$
  • $$Sc^{3+}$$
  • $$Ti^{3+}$$
Which one of the following complexes is diamagnetic in nature?
  • $$[Cr(NH_3)_6]^{3+}$$
  • $$[FeF_6]^{3-}$$
  • $$[Co(NH_3)_6]^{3+}$$
  • $$[Fe(H_2O)_6]^{2+}$$
A metal ion from the first transition has a magnetic moment (calculated) of $$3.87\ B.M$$. How many unpaired electrons are expected to be present in the ion?
  • $$1$$
  • $$2$$
  • $$3$$
  • $$4$$
Verdigris is:
  • basic copper acetate
  • basic lead acetate
  • basic lead
  • none
When excess of $$SnCl_2$$ is added to a solution of $$HgCl_2$$, a white precipitate turning to grey is obtained. The grey colour is due to the formation of:
  • $$Hg_2Cl_2$$
  • $$SnCl_4$$
  • $$Sn$$
  • $$Hg$$
Which one of the following is paramagnetic in nature ?
  • $$Ni(CO)_4$$
  • $$[Ni(CN)_4]^{2-}$$
  • $$[NiCl_4]^{2-}$$
  • $$[Co(NH_3)_6]^{3+}$$
The colour of zinc sulphide is:
  • yellow
  • white
  • brown
  • black
Which of the following pairs of ions have same paramagnetic moment?
  • $$Mn^{2+}, Cu^{2+}$$
  • $$Cu^{2+}, Ti^{3+}$$
  • $$Ti^{4+}, Cu^{2+}$$
  • $$Ti^{3+}, Ni^{2+}$$
The radius of $$La^{3+}$$ is $$1.06\ \overset {o}{A}$$, which of the following given values will be closest to the radius of $$Lu^{3+}$$ (At. no of $$Lu=71, La=57$$)?
  • $$ 1.6 \ {A}^{o}$$
  • $$ 1.4\ {A}^{o}$$
  • $$ 1.06\ {A}^{o}$$
  • $$ 0.85 \ {A}^{o}$$
Among $$d-$$ block elements, the most abundant element belongs to the:
  • first transition series
  • second transition series
  • third transition series
  • fourth transition series
Which one of the following ion has a magnetic moment of $$5.93\ B.M$$ ?
  • $$Mn^{2+}$$
  • $$Fe^{2+}$$
  • $$Cr^{2+}$$
  • $$V^{3+}$$
  • $$Cr^{3+}$$
Which has maximum paramagnetic character ?
  • $$[Fe(CN)_6]^{4-}$$
  • $$[Cu(H_2O)_4]^{2+}$$
  • $$[Cu(NH_3)_4]^{2+}$$
  • $$[Mn(H_2O)_6]^{2+}$$
Which of the following is not correct?
  • $$[Fe(CN)_6]^{3-}$$ is weakly paramagnetic
  • $$[Fe(CN)_6]^{4-}$$ is strongly paramagnetic
  • $$[Ni(CN)_4]^{2-}$$ is diamagnetic
  • $$[NiCl_4]^{2-}$$ is paramagnetic
Which group contains coloured ions out of
$$Cu^+\ Ti^{4+}\ Co^{2+}\ Fe^{2+}$$
  • $$1,2,3,4$$
  • $$3,4$$
  • $$2,3$$
  • $$1,2$$
Which of the following pairs of transition metal ions are the stronger oxidising agents in aqueous solution?
  • $$V^{2+}$$ and $$Cr^{2+}$$
  • $$Ti^{2+}$$ and $$Cr^{2+}$$
  • $$Mn^{3+}$$ and $$Co^{3+}$$
  • $$V^{2+}$$ and $$Fe^{2+}$$
  • $$Ni^{2+}$$ and $$Fe^{2+}$$
Which of the following statements is wrong  for the transition elements ? 
  • Transition elements are placed from $$ 3^{rd}$$ to $$ 6^{th}$$ period
  • Last electron enters in (n-1) d orbital
  • Exhibits variable valency
  • General electronic configuration is (n-1) $$ d^{1-10}$$ $$ n s^{0-2}$$
Predict the magnetic nature of $$A$$ and $$B$$.
  • both are diamagnetic
  • $$A$$ is diamagnetic and $$B$$ is paramagnetic with one unpaired electrons
  • $$A$$ is diamagnetic and $$B$$ is paramagnetic with two unpaired electrons
  • both are paramagnetic
The complex forming tendency of a transition metal depends upon:
  • Availability of a number of vacant $$d-$$ orbitals
  • high ionisation energy
  • small size of cation or high charge density
  • variable oxidation states
The correct order of magnetic moments amongst following complex ions is:
  • $$[MnCl_4]^{2-} > [Fe(CN)_6]^{4-} > [CoCl_4]^{2-}$$
  • $$[Fe(CN)_6]^{4-}
    > [MnCl_4]^{2-} > [CoCl_4]^{2-}$$
  • $$[MnCl_4]^{2-} > [CoCl_4]^{2-} > [Fe(CN)_6]^{4-}$$
  • $$[Fe(CN)_6]^{4-}
    > [CoCl_4]^{2-} > [MnCl_4]^{2-} $$
In the long form of periodic table, all the non-metals and metalloids are placed with :
  • $$s$$-block
  • $$p$$-block
  • $$d$$-block
  • $$f$$-block
Which one of the following complexes is not diamagnetic?
  • $$[Fe(CN)_6]^{4-}$$
  • $$[Ti(H_2O)_6]^{3+}$$
  • $$[Pt(CN)_4]^{2-}$$
  • $$[Co(NH_3)_6]^{3+}$$
The correct increasing order of paramagnetism of
$$(i)\ MnSO_4.
 4H_2O$$
$$(ii)\ FeSO_4.
 7H_2O$$
$$(iii)\ NiSO_4.
 6H_2O$$
$$(iv)\ CuSO_4.
 5H_2O$$ is:
  • $$(i) < (ii) < (iii) < (iv)$$
  • $$(iv) < (iii) < (i) < (i)$$
  • $$(iii) < (iv) < (ii) < (i)$$
  • $$(iii) < (iv) < (i) < (ii)$$
Transition metals form complexes because of:
  • small cation size
  • vacant $$d-$$ orbitals
  • large iconic charge
  • all of these
The ionic radius of $$ _{57}La^{3+}$$ is 1.06 $$\overset oA$$ Which one the  following give values will be closest to the ionic radius  of $$ _{71}Lu^{3+}$$ ?
  • 1.06 $$\overset oA$$
  • 1.56 $$\overset oA$$
  • 0.85 $$\overset oA$$
  • 1.35 $$\overset oA$$
Which ine of the following statement about lanthanides is false?
  • Lanthanides are sepearated 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
The ions from among the following which are colourless are 
(i) $$Ti^{4+}$$   (ii) $$Cu^{+}$$   (iii) $$Co^{3+}$$    (iv) $$Fe^{2+}$$
  • i and ii only
  • i, ii and iii
  • iii and iv
  • ii and iii
Which of the following function as catalysts for oxidation of $$SO_2$$ to $$SO_3$$ in industrial process for production of $$H_2SO_4$$?
  • $$TiO_2$$
  • $$PbO_2$$
  • $$Pt$$
  • $$V_2O_5$$
Among the following, the species that is both paramagnetic and coloured is : 
  • $$ \left [ MnO_{4} \right ]^{2-}$$
  • $$ \left [ TiCl_{6} \right ]^{2-}$$
  • $$ \left [ VO_{4} \right ]^{2-}$$
  • $$CrO_{2}Cl_{2}$$
Which ionic radius of $${_{57}{La^{3+}}}$$ is 1.06A. which one of the following values will be closest to ionic radius of $${_{71}{Lu^{3+}}}$$. ?
  • 1.06A
  • 1.56A
  • 0.85A
  • 1.35A
Out of all the known elements, the percentage of transitional elements is approximately  
  • $$30\%$$ 
  • $$50\%$$ 
  • $$60\%$$ 
  • $$75\%$$ 
Atomic number of Cr and Fe are 24 and 26 respectively. Which of the following is paramagnetic with the spin of electron?
  • $$ [ Cr(NH_3)_6]^{3+} $$
  • $$ [Fe(CO)_5] $$
  • $$ [ Fe (CN)_6]^{4-} $$
  • $$ [ Cr(CO)_6 ] $$
Which of the following pair of elements cannot form an alloy ?
  • $$ Zn - Hg$$
  • $$ Fe - Hg $$
  • $$ Hg - Cr  $$
  • $$ Na - Hg $$
Iron loses magnetic property at 
  • Melting point
  • 1000K
  • Curie point
  • Boiling point
The term platforming is 
  • Platinum painting
  • Flat sheet of platinum
  • Platinum manufacturing
  • Platinum used as a catalyst
Arrange $$ Ce^{3+} , La^{3+} ,Pm^{3+} $$ and $$ Yb^{3+} $$ in increasing order of their ionic radii
  • $$ Yb^{3+} < Pm^{3+} < Ce^{3+} < La^{3+} $$
  • $$ Ce^{3+} < Yb^{3+} < Pm^{3+} < La^{3+} $$
  • $$ Yb^{3+} < Pm^{3+} < La^{3+} < Ce^{3+} $$
  • $$ Pm^{3+} < La^{3+} < Ce^{3+} < Yb^{3+} $$
Colour of cobalt chloride solution is
  • pink
  • black
  • colourless
  • green
Which of the following statement(s) is(are) correct with reference to the ferrous and ferric ions?
  • $$ Fe^{3+} $$gives brown colour with potassium ferricyanide
  • $$ Fe^{2+} $$ gives blue precipitate with potassium ferricyanide
  • $$ Fe^{3+} $$gives red colour with potassium thiocyanate
  • $$ Fe^{2+} $$ gives brown colour with ammonium thiocyanate
Alizarin gives a red colour by mordanting it with the sulphate of a metal. The metal ion involved is 
  • $$Cr^{3+}$$
  • $$Fe^{3+}$$
  • $$Al^{3+}$$
  • $$Sn^{2+}$$
If $$CdI_2$$ is pink in colour, the $$CdCl_2$$ will be  '________' coloured.
  • yellow
  • red
  • blue
  • cannot be predicted
Which metal absorbs hydrogen?
  • $$Al$$
  • $$Fe$$
  • $$Pd$$
  • $$K$$
In the dichromate anion $$(Cr_{2}O_{7}^{2-}),$$
  • all $$Cr - O$$ bonds are equivalent
  • $$6 \,Cr - O$$ bonds are equivalent
  • $$3 \,Cr - O$$ bonds are equivalent
  • no bonds in $$Cr_{2}O_{7}^{2-}$$ are equivalent.
Which of the following statements is wrong?
  • $$Ti^{4+}$$ and $$Ag^{+}$$ are repelled by magnetic field
  • $$Mn^{2+}$$ shows maximum magnetic character among the first transition series.
  • $$Fe^{2+}$$ is more stable than $$Mn^{2+}$$ towards oxidation to $$+3$$ state.
  • $$Cr$$ in $$Cr_{2}O_{7}^{2-}$$ ion involves $$sp^{3}d^{2}$$ hybridisation
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