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प्रश्न
Out of \[\ce{Cu2Cl2}\] and \[\ce{CuCl2}\], which is more stable and why?
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उत्तर
\[\ce{CuCl2}\] is more stable than \[\ce{Cu2Cl2}\] . The stability of \[\ce{CuCl2}\] is because of high enthalpy of hydration of \[\ce{Cu^2+ (aq)}\] than that of \[\ce{Cu+ (aq)}\].
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संबंधित प्रश्न
Account for the following:
Mn shows the highest oxidation state of +7 with oxygen but with fluorine, it shows oxidation state of +4.
The elements of 3d transition series are given as: Sc Ti V Cr Mn Fe Co
Answer the following: Which element has the highest m.p?
In what way is the electronic configuration of the transition elements different from that of the non-transition elements?
What is meant by ‘disproportionation’?
Comment on the statement that elements of the first transition series possess many properties different from those of heavier transition elements.
Complete and balance the following chemical equations
`Fe^(2+) + MnO_4^(-) + H^+ ->`
Complete and balance the following chemical equations
`MnO_4^(-) + H_2O + I^(-) ->`
Electronic configuration of a transition element X in +3 oxidation state is [Ar]3d5. What is its atomic number?
Metallic radii of some transition elements are given below. Which of these elements will have highest density?
| Element | \[\ce{Fe}\] | \[\ce{Co}\] | \[\ce{Ni}\] | \[\ce{Cu}\] |
| Metallic radii/pm | 126 | 125 | 125 | 128 |
Although \[\ce{Cr^3+}\] and \[\ce{Co^2+}\] ions have same number of unpaired electrons but the magnetic moment of \[\ce{Cr^3+}\] is 3.87 B.M. and that of \[\ce{Co^2+}\] is 4.87 B.M. Why?
Ionisation enthalpies of Ce, Pr and Nd are higher than Th, Pa and U. Why?
Explain why does colour of KMnO4 disappear when oxalic acid is added to its solution in acidic medium.
Match the solutions given in Column I and the colours given in Column II.
| Column I (Aqueous solution of salt) |
Column II (Colour) |
| (i) \[\ce{FeSO2.7H2O}\] | (a) Green |
| (ii) \[\ce{NiCl2.4H2O}\] | (b) Light pink |
| (iii) \[\ce{MnCl2.4H2O}\] | (c) Blue |
| (iv) \[\ce{CoC12,6H2O}\] | (d) Pale green |
| (v) \[\ce{Cu2 Cl2}\] | (e) Pink |
| (f) Colourless |
Answer the following question:
Which element of the first transition series has lowest enthalpy of atomisation?
Mention any three processes where transition metals act as catalysts.
Which does not belong to first transition series?
Mercury is the only metal liquid at room temperature due to its:-
Give a reason for the following:
Transition metals possess a great tendency to form complex compounds.
Describe the oxidising action of potassium dichromate and write the ionic equation for its reaction with iron (II) solution.
