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प्रश्न
Give reasons: Sc3+ is colourless in aqueous solution whereas Ti3+ is coloured.
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उत्तर १
Sc3+ has no unpaired electron. So, it is colourless, whereas Ti3+ has one unpaired electron. Hence, it is coloured
उत्तर २
Compounds of transition elements are coloured due to the presence of unpaired electrons in d-orbitals as they show d-d-transition. In Sc+3 there are no d-electrons in Ti+3 there is one d-electrons.
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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)
The elements of 3d transition series are given as: Sc Ti V Cr Mn Fe Co
Answer the following: Write the element which shows maximum number of oxidation states. Give reason.
Account for the following:
E° value for the Mn3+/Mn2+ couple is much more positive than that for Cr3+/Cr2+.
How is the variability in oxidation states of transition metals different from that of the non-transition metals? Illustrate with examples.
Transition metals with lowest melting point is ______.
On the basis of the figure given below, answer the following questions:
- Why Manganese has lower melting point than Chromium?
- Why do transition metals of 3d series have lower melting points as compared to 4d series?
- In the third transition series, identify and name the metal with the highest melting point.
The basic character of transition metals monoxide follow the order.
Assertion (A): Transition metals have high enthalpy of atomisation.
Reason (R): Greater number of unpaired electrons in transition metals results in weak metallic bonding.
Explain the use of different transition metals as catalysts.
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
