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

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

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

संबंधित प्रश्‍न

Which of the following cations are coloured in aqueous solutions and why ?

Sc3+, V3+, Ti4+, Mn2+ (At. Nos. Sc = 21, V = 23, Ti = 22, Mn = 25)


Account for the following:

Cu+2 salts are coloured, while Zn2+ salts are white.


Which of the d-block elements may not be regarded as the transition elements?


Calculate the number of unpaired electrons in the following gaseous ions:

Mn3+, Cr3+, V3+ and Ti3+. Which one of these is the most stable in an aqueous solution?


When \[\ce{KMnO4}\] solution is added to oxalic acid solution, the decolourisation is slow in the beginning but becomes instantaneous after some time because ______.


Which of the following statements is not correct?


Transition elements show magnetic moment due to spin and orbital motion of electrons. Which of the following metallic ions have almost same spin only magnetic moment?

(i) \[\ce{Co^{2+}}\]

(ii) \[\ce{Cr^{2+}}\]

(iii) \[\ce{Mn^{2+}}\]

(iv) \[\ce{Cr^{3+}}\]


A solution of \[\ce{KMnO4}\] on reduction yields either a colourless solution or a brown precipitate or a green solution depending on pH of the solution. What different stages of the reduction do these represent and how are they carried out?


While filling up of electrons in the atomic orbitals, the 4s orbital is filled before the 3d orbital but reverse happens during the ionisation of the atom. Explain why?


When an oxide of manganese (A) is fused with KOH in the presence of an oxidising agent and dissolved in water, it gives a dark green solution of compound (B). Compound (B) disproportionates in neutral or acidic solution to give purple compound (C). An alkaline solution of compound (C) oxidises potassium iodide solution to a compound (D) and compound (A) is also formed. Identify compounds A to D and also explain the reactions involved.


Answer the following question:

Which element of the first transition series has highest second ionisation enthalpy?


The orientation of an atomic orbital is governed by


Which of the following maxm magnetic moment?


Among the following pairs of ions, the lower oxidation state in aqueous solution is more stable than the other in:-


Which of the following ions has the maximum magnetic moment?


Why is the `"E"_(("V"^(3+)//"V"^(2+)))^"o"` value for vanadium comparatively low?


Give reasons for the following statement:

Zn, Cd, and Hg are soft metals.


Account for the following:

Sc3+ is colourless whereas Ti3+ is coloured in an aqueous solution.


Which property of transition metals enables them to behave as catalysts?


Account for the following:

Copper has an exceptionally positive `"E"_("M"^(2+)//"M")^0` value.


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