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प्रश्न
The elements of 3d transition series are given as: Sc Ti V Cr Mn Fe Co
Answer the following: Which element shows only +3 oxidation state?
उत्तर
Sc shows only the +3 oxidation state.
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संबंधित प्रश्न
In 3d series (Sc to Zn), which element has the lowest enthalpy of atomisation and why?
How would you account for the irregular variation of ionization enthalpies (first and second) in the first series of the transition elements?
How would you account for the following:
The d1 configuration is very unstable in ions.
How is potassium dichromate prepared from chrome iron ore?
Explain why:
(i) Mn2+ is more stable than Fe2+ towards oxidation to +3 state.
(At. no. of Mn = 25, Fe = 26)
(ii) Transition elements usually form coloured ions.
(iii) Zr and Hf exhibit similar properties.
(At. no. of Zr = 40, Hf = 72)
In lake test for Al3+ ions, there is the formation of coloured ‘floating lake’. It is due to ______.
Mention any three processes where transition metals act as catalysts.
Fill in the blanks by choosing the appropriate word(s) from those given in the brackets:
(activation energy, Threshold energy, increased, lowered, partially, full, d-d transition, Benzoic acid, benzaldehyde)
Only those transition metal ions will be coloured which have ______ filled d-orbitals facilitating ______.
On adding NaOH, solution to the aqueous solution of K2CrO7 the colour of the solution changes from
In the ground state of atomic Fe (Z = 26), the spin-only magnetic moment is ______ × 10-1 BM.
(Round off to the nearest integer).
[Given: `sqrt3 = 1.73, sqrt2 = 1.41`]
