Advertisements
Advertisements
प्रश्न
Which of the d-block elements may not be regarded as the transition elements?
Advertisements
उत्तर
The electronic configuration of Zn, Cd and Hg is represented by the general formula (n – 1)d10ns2. In these elements, the orbitals are completely filled in the ground (normal) state as well as in ordinary oxidation states, i.e., the subshells are not incomplete in their atomic state or any one of the ionic states. Therefore, they cannot be called transition elements.
संबंधित प्रश्न
Explain why is Fe3+ more stable than Fe2+?
Explain why Cu+ ion is not stable in aqueous solutions?
Explain briefly how +2 state becomes more and more stable in the first half of the first row transition elements with increasing atomic number?
Following are the transition metal ions of 3d series:
Ti4+, V2+, Mn3+, Cr3+
(Atomic numbers: Ti = 22, V = 23, Mn = 25, Cr = 24)
Answer the following:
1) Which ion is most stable in an aqueous solution and why?
2) Which ion is a strong oxidising agent and why?
3) Which ion is colourless and why?
Give reasons Iron has the higher enthalpy of atomization than that of copper.
Explain why transition metals and their compounds act as a catalyst.
Give reasons for the following:
The transition metals generally form coloured compounds.
Which is the most stable oxidation state of iron?
Although Zirconium belongs to 4d transition series and Hafnium to 5d transition series even then they show similar physical and chemical properties because ______.
Why EΘ values for Mn, Ni and Zn are more negative than expected?
When a brown compound of manganese (A) is treated with \[\ce{HCl}\] it gives a gas (B). The gas taken in excess, reacts with \[\ce{NH3}\] to give an explosive compound (C). Identify compounds A, B and C.
Answer the following question:
Which element of the first transition series has highest third ionisation enthalpy?
It has been observed that first ionization energy of 5 d series of transition elements are higher than that of 3d and 4d series, explain why?
The spin magnetic moment of cobalt in the compound Hg [Co(SCN)4] is:-
Which one of the following characters tie of the transition metal is associated with higher catalytic activity?
Account for the following:
Transition metals form alloys.
The number of terminal oxygen atoms present in the product B obtained from the following reactions is:
\[\ce{FeCr2O4 + Na2CO3 + O2 -> A + Fe2O3 + CO2}\]
\[\ce{A + H^+ -> B + H2O + Na^+}\]
Assertion (A): Transition metals show their highest oxidation state with oxygen.
Reason (R): The ability of oxygen to form multiple bonds to metals.
Which property of transition metals enables them to behave as catalysts?
Why are interstitial compounds well known for transition metals?
