Advertisements
Advertisements
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?
Advertisements
उत्तर
Sc shows only the +3 oxidation state.
APPEARS IN
संबंधित प्रश्न
Account for the following:
Cu+ ion is unstable in aqueous solution.
Which metal in the first series of transition metals exhibits +1 oxidation state most frequently and why?
Why does the density of transition elements increase from Titanium to Copper? (at. no. Ti = 22, Cu = 29)
How is potassium dichromate prepared from chrome iron ore?
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?
Reactivity of transition elements decreases almost regularly from Sc to Cu. Explain.
A violet compound of manganese (A) decomposes on heating to liberate oxygen and compounds (B) and (C) of manganese are formed. Compound (C) reacts with KOH in the presence of potassium nitrate to give compound (B). On heating compound (C) with conc. \[\ce{H2SO4}\] and \[\ce{NaCl}\], chlorine gas is liberated and a compound (D) of manganese along with other products is formed. Identify compounds A to D and also explain the reactions involved.
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.
Account for the following:
Eu2+ with electronic configuration [Xe]4f76s2 is a strong reducing agent.
The second ionization enthalpies of chromium and manganese are 1592 and 1509 kJ/mol respectively. Explain the lower value of Mn.
