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Transition metals have high enthalpies of atomization.
Give the electronic configuration of d-orbitals of K3 [Fe(Cn)6] and K3[FeF6] and explain why these complexes give different colour with same solution.
Explain why Cr2+ is reducing but Mn3+ is oxidising while both ions have d4 configuration?
CrO is basic but Cr2O3is amphoteric ?
why do the transition elements show variable oxidation states?
Zn salts are white while Cu2+ salts are coloured. WHY?
1.why transition metals and their compounds act as a catalyst?
2.The outer electronic configurations of two members of the lanthanide series as follows:4f15d16s2 and 4f75d06s2.what are their atomic numbers?predict the oxidation states exhibited by these elements in their compounds?
why is scandium(2) virtually unknown
1. explain why cu+ ion is not stable in aqueous solution?
2. explain why Ce4+ is a stronger oxidizing agent?
3. which is stronger reducing agent Cr2+, or Fe2+ and why?
4. Describe the oxidizing property of KMnO4 in neutral of alkaline medium for its reaction with iodide irons and thiosulphate irons.
5. What is magnetic moment of Cr3+ ion?
6. why do transition metals form alloys?
7. Why is V2+ is more Stable than V3+
Europium(II) is more stable trhan Cerium (II)
what is lanthanoid and actinoids contraction?
Transition metals exhibits higher oxidation state in oxides and fluorides WHY?
Co2+ is easily oxidised to Co3+ ion in the presence of ligands .WHY?
what is meant by poor shielding effect ?
IUPAC NAME OF K3[Al(C2O4)3]
describe the preparation of k2cr2o7 from chromite ore and explain the reaction of k2cr2o7 with acid FeSo4 , KI and H2S ?
The e value for copper is positive (+ 0.34V). What is possible reason for this?
Why Zr and Hf have identical sizes?
nickel does not form low spin octahedral complexes
La(OH)3 is more basic than Lu(OH)3. Give reason...
hcl is not used to acidify a permanganate solution in volumetric estimation of Fe+ or C2O42-
what is difference between valency and oxidation state with egs and detail.
Explain the chemistry behind chromyl chloride test.
Mn3+ and Co3+ ions are the strongest oxidising agents in aqueous solution.
transition elements form alloys
Cr2+ is a stronger reducing agent than Fe2+ .why?
plz ans in short
Explain why Mo(VI) and W(VI) are found to be more stable than Cr(VI).
Give Explanatory answer that I can write in Board Exam.
Describe preparation of KMnO4 from pyrolusite.
What is the effect of increasing pH on a solution of potassium dichromate????
plz help me in dis!!
Why is oxygen a gas and Sulphur a solid ?
why is ferric chloride preferred over potassium chloride in case of a cut leading to bleeding?
Give the oxidising properties of KMNO4 in acidic medium with
1) sodium arsenite
2) hydrogen peroxide
What is meant by disproportionation? Give one example of disproportionation reaction in aqueous solution.
cu2+ is coloured but cu+ is not and sc2+ is colured but sc3+ is not why????
Assign reasons for the following :
(i) SF6 is kinetically inert.
(ii) NF3 is an exothermic compound whereas NCl3 is not.
(iii) HCl is a stronger acid than HF though fluorine is more electronegative than chlorine.
Transition metals and many of their compounds show paramagnetic
The enthalpies of atomisation of the
transition metals are high.
The transition metals generally form
Transition metals and their many
compounds act as good catalyst.
the preparation of potassium permanganate. How does the acidified
permanganate solution react with (i) iron(II) ions (ii) SO2
and (iii) oxalic acid?
Write the ionic equations for the reactions.
1. In the first transition series only copper has positive electrode potential. Why?
PLEASE ANSWER AS EARLY AS POSSIBLE!!!!!!!!!!
Zn, Cd, and Hg are not regarded as transition elements and why Uub is regarded as transition elements
In a transition series of metals the metal which exhibits the greatest no. Of oxidation states occurs in the middle of the series
Ce3+ is easily oxidised to Ce4+. WHY?
Why are transition metals good catalysts??
''Permanganate exhibits weak temperature dependent paramagnetism''.Does it mean its paramagnetism is weak or it's weakly dependent on temperature?
which is stronger reducing agent fe2+ or cr2+ and why???
Draw a sketch to show the splitting of d orbitals in an octahedral crystal field. State for a d6 ion how the actual configuration of the split d orbitals in an octahedral crystal field is decided by the relative values of Δ0 and P.
why are scandium salts white in colour
Why the third ionisation enthalpy of Mn is generally exceptionally high?
Cr3+ is most stable ion in aqueous solution. Why?
Why do Mn & Tc have low melting points?
How does the colour of K2Cr2O7 solution depends on pH of the solution?
Q- why the melting point of manganese is less than chromium if their d orbital is halffilled
.La3+ (Z=57) and Lu3+ (Z=71) do not show any coloured solution. why?
which has poor shielding effect 4f or 5f ?
why Zn,Cd,Hg are known as pseudo transition elements?
ans fast plzzzzzzz
Why do transition elements have high melting & boiling point?
K2PtCl6 is a well known compound whereas corresponding Ni compound is not known
why metal metal bonding is more frequent for the 4d and the 5d series of transtion metals than that for the 3d series????????????
why Transition elements show highest oxidation state in their oxides thanfluorides?
What is lanthanoid contraction & what ar the consequences of lanthanoid contraction?
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