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

Generally transition elements and their salts are coloured due to the presence of unpaired electrons in metal ions. Which of the following compounds are coloured? (i) KMnOX4 (ii) Ce(SOX4)X2

Advertisements
Advertisements

प्रश्न

Generally transition elements and their salts are coloured due to the presence of unpaired electrons in metal ions. Which of the following compounds are coloured?

(i) \[\ce{KMnO4}\]

(ii) \[\ce{Ce(SO4)2}\]

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

(iv) \[\ce{Cu2 Cl2}\]

टिप्पणी लिखिए
Advertisements

उत्तर

(i) \[\ce{KMnO4}\]

(ii) \[\ce{Ce(SO4)2}\]

Explanation:

\[\ce{KMnO4}\] and \[\ce{Ce(SO4)2}\] are coloured due to charge transfer.

shaalaa.com
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 8: The d-and f-Block Elements - Multiple Choice Questions (Type - I) [पृष्ठ १०९]

APPEARS IN

एनसीईआरटी एक्झांप्लर Chemistry Exemplar [English] Class 12
अध्याय 8 The d-and f-Block Elements
Multiple Choice Questions (Type - I) | Q 22 | पृष्ठ १०९

संबंधित प्रश्न

Complete the following equation:

\[\ce{2MnO4- + 6H+ + 5NO2- ->}\]


Complete the following equation :

`2MnO_4^(-)+6H^++5NO_2^(-)rarr`

 


Complete the following equations:Cr2O72- + 2OH


Give an example and suggest a reason for the following feature of the transition metal chemistry:

A transition metal exhibits the highest oxidation state in oxides and fluorides.


Indicate the steps in the preparation of K2Cr2O7 from chromite ore.


Complete the following chemical equations :

Cu + H2SO4(conc.) →


Account for the following : 
Manganese shows maximum number of oxidation states in 3d series. 


E0 value for  Mn3+ Mn2+ couple is much more positive than that for Cr3-/ Cr2-.


 Write the ionic equation showing the oxidation of Fe(II) salt by acidified dichromate solutions. 


Zinc carbonate is precipitated from zinc sulphate solution by the addition of ___________.


Which of the following reactions are disproportionation reactions?

(a) \[\ce{Cu^{+} -> Cu^{2+} + Cu}\]

(b) \[\ce{3MnO^{-}4 + 4H^{+} -> 2MnO^{-}4 + MnO2 + 2H2O}\]

(c) \[\ce{2KMnO4 -> K2MnO4 + MnO2 + O2}\]

(d) \[\ce{2MnO^{-}4 + 3Mn^{2+} + 2H2O -> 5MnO2 + 4H^{+}}\]


In the form of dichromate, \[\ce{Cr (VI)}\] is a strong oxidising agent in acidic medium but \[\ce{Mo (VI)}\] in \[\ce{MoO3}\] \[\ce{and W (VI)}\] in \[\ce{WO3}\] are not because:

(i) \[\ce{Cr(VI)}\] is more stable than \[\ce{Mo(VI)}\] and  \[\ce{and W(VI)}\].

(ii) \[\ce{Mo(VI)}\] and \[\ce{and W(VI)}\] are more stable than  \[\ce{Cr(VI)}\].

(iii) Higher oxidation states of heavier members of group-6 of transition series are more stable.

(iv) Lower oxidation states of heavier members of group-6 of transition series are more stable.


When \[\ce{Cu^2+}\] ion is treated with \[\ce{KI}\], a white precipitate is formed. Explain the reaction with the help of chemical equation.


The product formed upon heating methyl bromide with potassium tert-butoxide is


Why \[\ce{HCl}\] should not be used for potassium permanganate titrations?


What is the effect of pH on dichromate ion solution?


The oxidation state of manganese in the product obtained in a reaction of potassium permanganate and hydrogen peroxide in a basic medium is ______. 


Potassium dichromate when heated with concentrated sulphuric acid and a soluble chloride, gives brown-red vapours of ______.


Indicate the steps in the preparation of \[\ce{K2Cr2O7}\] from chomite ore.


Indicate the steps in the preparation of \[\ce{K2Cr2O7}\] from chromite ore.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×