Chemistry - D F Block Elements - Quiz-5

Actinoids exhibit more number of oxidation states than lanthanoids. It is because of :

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The greater metallic character of the lanthanoids than that of the corresponding actinoids.
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More energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals.
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The lesser energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals.
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More active nature of the actinoids.

Acidified K₂Cr₂O₇ solution turns green when Na₂SO₃ is added to it. This is due to the formation of

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${CrO}_{4}^{2 -}$
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${Cr}_{2} {({SO}_{3})}_{3}$
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${CrSO}_{4}$
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${Cr}_{2} {({SO}_{4})}_{3}$

Which of the following ions will exhibit colour in aqueous solutions?

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La³⁺ (Z=57)
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Ti³⁺ (Z=22)
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Lu³⁺ (Z=71)
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Sc³⁺ (Z=21)

Which one of the following ions has electronic configuration [Ar] 3d⁶?
(At. no :Mn = 25, Fe= 26, Co= 27, Ni = 28)

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$N i^{3 +}$
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$M n^{3 +}$
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$F e^{3 +}$
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$C o^{3 +}$

Which of the following pairs has the same size?

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$F e^{2 +}, N i^{2 +}$
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$Z r^{4 +}, T i^{4 +}$
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$Z r^{4 +}, H f^{4 +}$
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$Z n^{2 +}, H f^{4 +}$

Which one of the elements with the following outer orbital configurations may exhibit the largest number of oxidation states?

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3d³, 4s²
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3d⁵, 4s¹
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3d⁵, 4s²
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3d², 4s²

Which one of the following ions is the most stable in aqueous solution?
(At. No. Ti = 22, V = 23, Cr = 24, Mn = 25)

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$C r^{3 +}$
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$V^{3 +}$
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$T i^{3 +}$
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$M n^{3 +}$

The d-electron configurations of Cr²⁺, Mn²⁺, Fe²⁺ and Ni²⁺ and 3d⁴, 3d⁵, 3d⁶ and 3d⁸ respectively. Which one of the following aqua complexes will exhibit the minimum paramagnetic behaviour?
(At. No. Cr = 24, Mn = 25, Fe = 26, Ni = 28)

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$[M n (H_{2} O)_{6}]^{2 +}$
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$[F e (H_{2} O)_{6}]^{2 +}$
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$[N i (H_{2} O)_{6}]^{2 +}$
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$[C r (H_{2} O)_{6}]^{2 +}$

The manganate and permanganate ions are tetrahedral, due to:

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The $π$ -bonding involves overlap of d-orbitals of oxygen with d-orbitals of manganese
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The $π$ -bonding involves overlap of p-orbitals of oxygen with d-orbitals of manganese
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There is no $π$ -bonding
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The $π$ -bonding involves overlap of p-orbitals of oxygen with p-orbitals of manganese

Diamagnetic ion among the following is-

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La³⁺
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Lu³⁺
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Ce⁴⁺
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All of the above.

The element having the highest second ionization enthalpy in the 3d-series among the following is-

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Cr
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Mn
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Fe
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Ti

The number of d-electrons in ${Fe}^{2 +}$ is not equal to
that of the

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p-electrons in Ne
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s-electrons in Mg
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d-electrons in Co⁺³
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p-electrons in ${Cl}^{^{_}}$

The magnetic moment of Mn²⁺ ion is :

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5.92BM
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2.80BM
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8.95BM
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3.90BM

Incorrect statement among the following is :

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La(OH)₃ is less basic than Lu(OH)₃
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In lanthanoid series ionic radius of Ln³⁺ ions decreases.
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La is actually an element of transition metal series rather than lanthanide series.
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Atomic radii of Zr and Hf are same because of lanthanide contraction.

When the sample of copper with zinc impurity is to be purified by electrolysis,

the appropriate electrodes are

Cathode Anode

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pure zine pure copper
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pure copper impure sample
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impure zinc impure sample
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impure sample pure copper

Potassium chromate with an excess of dilute nitric acid generates -

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${Cr}_{2} O_{7}^{2 -} and H_{2} O$
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${Cr}^{3} and {Cr}_{2} O_{7}^{2 -}$
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${CrO}_{4}^{2 -}$
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${Cr}_{2} O_{4}^{2 -}$

Cerium (Z-58) is an important member of the lanthanoids. Which of the following statements about cerium is incorrect?

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The common oxidation states of cerium are +3 and +4
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The +3 oxidation state of cerium is more stable than the +4 oxidation state
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The +4 oxidation state of cerium is not known in solutions
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Cerium (IV) acts an oxidizing agent

The oxidation state of chromium in the final product formed by the reaction between KI and acidified potassium dichromate solution is :

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+2
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+3
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+4
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+6

Match the catalyst with the process:

Catalyst Process

(i) $V_{2} O_{5}$ (a) The oxidation of ethylene to ethanal

(ii) TiCl₄ + Al(CH₃)₃ (b) Polymerisation of alkynes

(iii) $P d C l_{2}$ (c) Oxidation of $S O_{2}$ in the manufacture of $H_{2} S O_{4}$

(iv) Nickel complexes (d) Polymerisation of ethylene

Which of the following is the correct matching of Catalyst & Process?

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(i)-(c), (ii)-(d), (iii)-(a), (iv)-(b)
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(i)-(a), (ii)-(b), (iii)-(c), (iv)-(d)
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(i)-(a), (ii)-(n), (iii)-(b), (iv)-(d)
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(i)-(c), (ii)-(a), (iii)-(d), (iv)-(b)

When neutral or faintly alkaline $K M n O_{4}$ is treated with potassium iodide, iodide ion is converted into 'X', 'X' is-

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$I_{2}$
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$I O_{4}^{-}$
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$I O_{3}^{-}$
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$I O^{-}$

The metal having different lattice from those of others is

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Co
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Fe
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Ag
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Ni

The correct order of E⁰(M²⁺/M) values with negative sign for the four successive elements Cr, Mn, Fe and Co is

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Mn>Fe>Co>Cr
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Mn>Cr>Fe>Co
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Fe>Mn>Cr>Co
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Co>Fe>Mn>Cr

The hardest lanthanide is

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La
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Lu
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Sm
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Yb

The unpaired electron in Eu³⁺ will be same in

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Yb²⁺
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Ho³⁺
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Sm²⁺
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Gd³⁺

X, P and Q are respectively

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MnO⁺₃, Mn₂O₇, conc. H₂SO₄, K₂MnO₄
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K₂MnO₄, conc. H₂SO₄, Mn₂O₇, MnO⁺₃
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Na₂CO₃, $M n_{2} O_{7}, M n O_{3}$
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H⁺, K₂MnO₄, MnO⁺₃, Mn₂O₇

The element which has maximum composition in Misch metal and used in gas lighters is

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Ce
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Fe
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Sm
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La

Select the correct statement(s) among the following

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CeS is used for making crucibles
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Hybridisation of Mn in KMnO₄ is d³s
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CO^2-₃ and HCO^-₃ ions can be distinguished by using AgNO₃
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All of these

The correct statement is

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Green vitriol and blue vitriol are isomorphus
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KMnO₄ and K₂Cr₂O₇ are coloured due to d-d transitions
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Cu₂Cl₂ and Ag₂S are coloured
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Upon strong heating paramagnetic gases are evolved by CuSO₄ and AgNO₃

Which is true about the ionic radius of M²⁺?

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Ni²⁺<Cu²⁺<Zn²⁺
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Ni²⁺>Cu²⁺>Zn²⁺
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Cu²⁺<Ni²⁺<Zn²⁺
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Zn²⁺<Ni²⁺<Cu²⁺

Which of the following will not give a positive chromyl chloride test?

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CuCl₂
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ZnCl₂
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HgCl₂
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NH₄Cl

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Practice Chemistry Quiz Questions and Answers

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Practice Chemistry Quiz Questions and Answers

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