d and f-block elements (Transition and inner transition elements)

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Test1 Max. Marks = 40

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1. Which of the following ions are colourless-

4 points

(A) V³⁺

(B) Mn²⁺

(D) V⁵⁺

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2. The ability of d- block elements to form complexes is due to -

4 points

(A) small and highly charged ions

(B) Vacant low energy orbital to accept lone pair of electrons from ligands

(D) None is correct

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3.The yellow colour of chromates changes to orange on acidification due to the formation of-

4 points

(A) Cr³⁺

(B) Cr₂O₃

(D) CrO₄⁻

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4. In solid copper sulphate, copper is coordinated to -

4 points

(A) Five water molecules

(B) four water molecules

(D) One water molecules

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5. In the dichromate dianion,

4 points

(A) 4 Cr– O bonds are equivalent

(B) 6 Cr–O bonds are equivalent

(D) all Cr–O bonds are non- equivalent

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6. A substance which is not paramagnetic is

4 points

(A) Cr(ClO₄)₃

(B) KMnO₄

(D) VOBr₂

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7. If a transition-metal compound absorbs violet radiation in the visible region, its colour would be

4 points

(A) Yellow green

(B) Yellow

(D) Blue

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8. Which of the following is a correct statements -

4 points

(A) Iron is an element of third transition series

(B) Iron is a f-block element

(D) None of these

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9. Transition elements show variable oxidation states because they lose electrons from the following orbitals

4 points

(A) ns and np

(B) (n – 1) d and ns

(D) ns

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10. The magnetic moment of a transition metal ion is found to be 3.87 B.M. The number of unpaired electrons present in it is -

4 points

(A) 2

(B) 3

(D) 5

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