Class XII Chemistry D & F Block Elements 1

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Question 1

V₂O₅ is red or orange in colour. It is a/an..... oxide –

• AAcidic
• BBasic
• CAmphoteric
• DNeutral

Question 2

Out of [Fe(CN)₆]^4– , [Ni(CN)₄]^2– and [Ni(CO)₄]:

• AAll have identical geometry
• BAll are paramagnetic
• CAll are diamagnetic
• D[Fe(CN)₆]^4– is diamagnetic but [Ni(CN)₄]^2– & [Ni(CO)₄] are paramagnetic

Question 3

All the following species are strong oxidizing agents. Their strength as oxidizing agents in acidic solution is such that –

• AS₂O₈^2– > Cr₂O₇^2– > MnO₄^–
• BMnO₄^– > Cr₂O₇^2– > S₂O₈^2–
• CS₂O₈^2– > MnO₄^– > Cr₂O₇^2–
• DMnO₄^– > S₂O₈^2– > Cr₂O₇^2–

Question 4

Match the compounds of column X with oxidation state (metal) of column Y–

• AI-3, II-6, III-5, IV-4
• BI-3, II-4, III-5, IV-6
• CI-4, II-5, III-6, IV-3
• DI-6, II-5, III-4, IV-3

Question 5

FeCr₂O₄ (chromite) is converted to Cr by following steps:

• AI-Na₂CO₃/ air
  II- C, Δ
  III- Al, Δ
• BI-NaOH/ air 
  II-C, Δ
  III- Al, Δ
• CI-NaOH/ air 
  II- C, Δ
  III- Mg, Δ
• DI-conc. H₂SO₄
  II- Δ, NH₄Cl 
  III- C, Δ

Question 6

TiI₄ on heating gives –

• ATiI₂ + I₂
• BTi + 2I₂
• CTiI₃ + I₂
• DNone of these

Question 7

In [Fe(CN)₅ (NO⁺)]^2–, Fe has + 3 state, It can be decided by –

• AMagnetic measurement
• BColligative property
• CColour
• DHybridization

Question 8

Which is not true statement about KMnO₄?

• AIts solution is unstable in acidic medium
• BIts small quantity added to conc. H₂SO₄, a green coloured solution containing MnO₃⁺ ion is formed
• CMnO₄^– changes to Mn²⁺ in basic solution
• DIt is self- indicator in Fe²⁺ or C₂O₄^2– titration.

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