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प्रश्न
Account for the following:
Sc3+ is colourless whereas Ti3+ is coloured in an aqueous solution.
Account for the following:
Ti3+ is coloured whereas Sc3+ is colourless in an aqueous solution.
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उत्तर
Sc3+: [Ar]18
Ti3+: [Ar]18 3d1
Ti3+ is coloured in an aqueous solution due to the presence of one unpaired electron, whereas Sc3+ is colourless.
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संबंधित प्रश्न
Which metal in the first transition series (3d series) exhibits + 1 oxidation state most frequently and why?
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:
Cr2+ is a strong reducing agent.
What are the characteristics of the transition elements and why are they called transition elements?
Why does copper not replace hydrogen from acids?
Assertion (A): Cu cannot liberate hydrogen from acids.
Reason (R): Because it has positive electrode potential.
Which of the following statements is not correct?
Which does not belong to first transition series?
Match List - I with List - II.
| List - I | List - II | ||
| (A) | [Fe(CN)6]3− | (i) | 5.92 BM |
| (B) | [Fe(H2O)6]3+ | (ii) | 0 BM |
| (C) | [Fe(CN)6]4− | (iii) | 4.90 BM |
| (D) | [Fe(H2O)6]2+ | (iv) | 1.73 BM |
Choose the correct answer from the options given below.
Give a reason for the following:
Zinc, cadmium and mercury are considered as d-block elements but not regarded as transition elements.
