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कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान 2nd PUC Class 12

Which of the following will not act as oxidising agents? (i) CrOX3 (ii)MoOX3 (iii) WOX3 (iv) CrOX42− - Chemistry

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प्रश्न

Which of the following will not act as oxidising agents?

(i) \[\ce{CrO3}\]

(ii) \[\ce{MoO3}\]

(iii) \[\ce{WO3}\]

(iv) \[\ce{CrO^{2-}4}\]

टीपा लिहा
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उत्तर

(ii)\[\ce{MoO3}\]

(iii) \[\ce{WO3}\]

Explanation:

A compound act as oxidising agent when it’s central atom is reduced to its lower oxidation state. This occurs only when the lower oxidation state of metal is more stable than the higher oxidation states. 

In metal \[\ce{WO3}\] and \[\ce{CrO4^{2-}}\], both W and Cr are stable in their higher oxidation state and won’t get reduced to their lower oxidation state. Therefore, will not act as oxidising agents. 

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पाठ 8: The d-and f-Block Elements - Multiple Choice Questions (Type - I) [पृष्ठ ११०]

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एनसीईआरटी एक्झांप्लर Chemistry [English] Class 12
पाठ 8 The d-and f-Block Elements
Multiple Choice Questions (Type - I) | Q 30 | पृष्ठ ११०

संबंधित प्रश्‍न

To what extent do the electronic configurations decide the stability of oxidation states in the first series of the transition elements? Illustrate your answer with examples.


What are the characteristics of the transition elements and why are they called transition elements? 


How would you account for the following:

Cobalt (II) is stable in aqueous solutions, but in the presence of complexing reagents, it is easily oxidised.


Write the formula of an oxo-anion of Chromium (Cr) in which it shows the oxidation state equal to its group number


Give reasons: Sc3+ is colourless in aqueous solution whereas Ti3+ is coloured.


Account for the following : 
 Ti4+ is colourless whereas V4+  is coloured in an aqueous solutions. 


Transition metals with lowest melting point is ______.


Which is the most stable oxidation state of iron?


The magnetic moment is associated with its spin angular momentum and orbital angular momentum. Spin only magnetic moment value of \[\ce{Cr^{3+}}\] ion is ______.


Match the catalysts given in Column I with the processes given in Column II.

Column I (Catalyst) Column II (Process)
(i) \[\ce{Ni}\] in the presence of hydrogen (a) Zieglar Natta catalyst
(ii) \[\ce{Cu2C12}\] (b) Contact process
(iii) \[\ce{V2O5}\] (c) Vegetable oil to ghee
(iv) Finely divided iron (d) Sandmeyer reaction
(v) \[\ce{TiCl4 + Al (CH3)3}\] (e) Haber's Process
  (f) Decomposition of KCIO3

Match the properties given in Column I with the metals given in Column II.

  Column I (Property) Column II (Metal)
(i)  An element which can show +8 oxidation state (a) \[\ce{Mn}\]
(ii)  3d block element that can show (b) \[\ce{Cr}\]
  upto +7 oxidation state (c) \[\ce{Os}\]
(iii)  3d block element with highest melting point (d) \[\ce{Fe}\]

The complex showing a spin-span magnetic moment of 2.82 B.M. is :-


Which of the following transition metal is not coloured?


Account for the following:

Transition metals form alloys.


Account for the following:

Eu2+ with electronic configuration [Xe]4f76s2 is a strong reducing agent.


Account for the following:

Zirconium (Zr) and Hafnium (Hf) are difficult to separate.


A coordination compound has the formula \[\ce{CoCl3.4NH3}\]. It precipitates silver ions as AgCl and its molar conductance corresponds to a total of two ions.

Based on this information, answer the following question:

  1. Deduce the structural formula of the complex compound.
  2. Write the IUPAC name of the complex compound.
  3. Draw the geometrical isomers of the complex compound.

Describe the oxidising action of potassium dichromate and write the ionic equation for its reaction with H2S.


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