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

Assertion: CuX2+ iodide is not known. Reason: CuX2+ oxidises IX− to iodine. - Chemistry

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प्रश्न

Assertion: \[\ce{Cu^2+}\] iodide is not known.

Reason: \[\ce{Cu^2+}\] oxidises \[\ce{I^-}\] to iodine.

पर्याय

  • Both assertion and reason are true, and reason is the correct explanation of the assertion.

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

  • Assertion is not true but reason is true.

  • Both assertion and reason are false.

MCQ
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उत्तर

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

Explanation:

All halogens combine with copper to form copper halides except iodine. The reason behind this is that \[\ce{Cu^2+}\] oxidises iodide (-1) to iodine (0). Therefore, \[\ce{Cu^2+}\] iodide does not exist .Both the statements assertion and reason are correct and reason is the correct explanation of assertion.  

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पाठ 8: The d-and f-Block Elements - Multiple Choice Questions (Type - I) [पृष्ठ ११४]

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एनसीईआरटी एक्झांप्लर Chemistry [English] Class 12
पाठ 8 The d-and f-Block Elements
Multiple Choice Questions (Type - I) | Q 59 | पृष्ठ ११४

संबंधित प्रश्‍न

What are the transition elements? Write two characteristics of the transition elements.


The `E_((M^(2+)//M))^Θ` value for copper is positive (+0.34 V). What is possibly the reason for this? (Hint: consider its high ΔaHΘ and low ΔhydHΘ)


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


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


How would you account for the following:

Of the d4 species, Cr2+ is strongly reducing while manganese (III) is strongly oxidising.


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.


What can be inferred from the magnetic moment value of the following complex species?

Example Magnetic Moment (BM)
K2[MnCl4] 5.9

How would you account for the following? 

Zr (Z = 40) and Hf (Z = 72) have almost identical radii.

 


Give reasons: 

E° value for the Mn3+/Mn2+ couple is much more positive than that for Fe3+/Fe2+.


Which of the following statements is not correct?


Although fluorine is more electronegative than oxygen, but the ability of oxygen to stabilise higher oxidation states exceeds that of fluorine. Why?


The halides of transition elements become more covalent with increasing oxidation state of the metal. Why?


Answer the following question:

Which element of the first transition series has lowest enthalpy of atomisation?


It has been observed that first ionization energy of 5 d series of transition elements are higher than that of 3d and 4d series, explain why?


The standard electrode potentials of four elements A, B, C and D are – 3.05, – 1.66, – 0.40 and + 0.80. The highest chemical reactivity will be exhibited by


Mercury is the only metal liquid at room temperature due to its:-


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


Give reason for the following statement:

[Ti(H2O)]3+ is coloured while [Sc(H2O)6]3+ is colourless.


Assertion (A): Transition metals have high enthalpy of atomisation.

Reason (R): Greater number of unpaired electrons in transition metals results in weak metallic bonding.


Compare the general characteristics of the first series of the transition metals with those of the second and third series metals in the respective vertical columns. Give special emphasis on the following point:

Ionisation enthalpies


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