12th chemistry Unit-4

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Chemistry Unit-4 TRANSITION AND INNER TRANSITION ELEMENTS

குறிப்பு: அனைத்து வினாக்களுக்கும் சரியான விடை கொடுத்து முழுமதிப்பெண்கள் பெறும் வரை பயிற்சி செய்யுங்கள்.

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1.Sc( Z=21) is a transition element but Zinc (z=30) is not because

1 point

a) both Sc³⁺ and Zn²⁺ ions are colourless and form white compounds.

b) in case of Sc, 3d orbital are partially filled but in Zn these are completely filled

c) last electron as assumed to be added to 4s level in case of zinc

d) both Sc and Zn do not exhibit variable oxidation states

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2.Which of the following d block element has half filled penultimate d sub shell as well as half f illed valence sub shell?

1 point

a) Cr

c) Pt

b) Pd

d) none of these

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3.Among the transition metals of 3d series, the one that has highest negative (M²⁺/M) standard electrode potential is

1 point

a) Ti

b) Cu

c) Mn

d) Zn

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4.Which one of the following ions has the same number of unpaired electrons as present in V²⁺?

1 point

a) Ti³⁺

b) Fe³⁺

c) Ni²⁺

d) Cr³⁺

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5.The magnetic moment of Mn²⁺ ion is

1 point

a) 5.92BM

b) 2.80BM

c) 8.95BM

d) 3.90BM

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6.the catalytic behaviour of transition metals and their compounds is ascribed mainly due to

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a) their magnetic behaviour

b) their unfilled d orbitals

c) their ability to adopt variable oxidation states

d) their chemical reactivity

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7.The correct order of increasing oxidizing power in the series

1 point

a) VO⁺₂Cr₂O₇²⁻< MnO₄⁻

b) Cr₂O₇²⁻< VO₂⁺ MnO₄⁻

c) Cr₂O₇²⁻<MnO₄⁻ <VO₂⁺

d) MnO₄⁻ < Cr₂O₇²⁻<VO₂⁺

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8.In acid medium, potassium permanganate oxidizes oxalic acid to

1 point

a) oxalate

b) Carbon dioxide

c) acetate

d) acetic acid

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9.Which of the following statements is not true?

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a) on passing H₂S, through acidified K₂Cr₂O₇ solution, a milky colour is observed.

b) Na₂Cr₂O₇ is preferred over K₂Cr₂O₇ in volumetric analysis

c) K₂Cr₂O₇ solution in acidic medium is orange in colour

d) K₂Cr₂O₇ solution becomes yellow on increasing the PH beyond 7

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10.Permanganate ion changes to ________ in acidic medium

1 point

a) MnO ₄²⁻

b) Mn ²⁺

c) Mn ³⁺

d) MnO

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11. How many moles of I2 are liberated when 1 mole of potassium dichromate react with potassium iodide?

1 point

a) 1

c) 3

b) 2

d) 4

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12.The number of moles of acidified KMnO₄ required to oxidize 1 mole of ferrous oxalate(FeC₂O₄) is

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a) 5

b) 3

c) 0.6

d) 1.5

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13.Which one of the following statements related to lanthanons is incorrect? a) Europium shows +2 oxidation state.

1 point

a) Europium shows +2 oxidation state.

b) The basicity decreases as the ionic radius decreases from Pr to Lu.

c) All the lanthanons are much more reactive than aluminium.

d) Ce⁴⁺ solutions are widely used as oxidising agents in volumetric analysis.

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14.Which of the following lanthanoid ions is diamagnetic?

1 point

a) Eu²⁺

c) Ce²⁺

b) Yb²⁺

d) Sm²⁺

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15.Which of the following oxidation states is most common among the lanthanoids?

1 point

a) 4

c) 5

b) 2

d) 3

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16.Assertion : Ce⁴⁺ is used as an oxidizing agent in volumetric analysis. Reason: Ce⁴⁺ has the tendency of attaining +3 oxidation state.

1 point

a) Both assertion and reason are true and reason is the correct explanation of assertion.

b) Both assertion and reason are true but reason is not the correct explanation of assertion.

c) Assertion is true but reason is false.

d) Both assertion and reason are false.

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17.The most common oxidation state of actinoids is

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a) +2

c) +4

b) +3

d) +6

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18.The actinoid elements which show the highest oxidation state of +7 are

1 point

a) Np, Pu ,Am

c) U, Th, Md

b) U, Fm, Th

d) Es, No, Lr

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19. Which one of the following is not correct?

0 points

a) La(OH)₃ is less basic than Lu(OH)₃

b) In lanthanoid series ionic radius of Ln³⁺ ions decreases

c) La is actually an element of transition metal series rather than lanthanide series

d) Atomic radii of Zr and Hf are same because of lanthanide contraction

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