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Transition metals have high enthalpies of atomization.
Why does the ionisation enthalpy of V is less than Ti ?
Explain why Cr2+ is reducing but Mn3+ is oxidising while both ions have d4 configuration?
why do the transition elements show variable oxidation states?
why iron does not exibit +5 oxidation state ?
Zn salts are white while Cu2+ salts are coloured. WHY?
.La3+ (Z=57) and Lu3+ (Z=71) do not show any coloured solution. 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?
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+
what is lanthanoid and actinoids contraction?
why are enthalpies of atomisation of 4d and 5d series are greater than 3d series?
Co2+ is easily oxidised to Co3+ ion in the presence of ligands .WHY?
why (MnO4)2- is paramagnetic and (MnO4)1- is dimaganetic
what is meant by poor shielding effect ?
WHY FOR ELECTRONIC CONFIG OF f BLOCK ELEMENTS, {(n-1)d 0-1} d has only 0-1 electrons? why can't it have 2 or more?
IUPAC NAME OF K3[Al(C2O4)3]
why is scandium(2) virtually unknown
describe the preparation of k2cr2o7 from chromite ore and explain the reaction of k2cr2o7 with acid FeSo4 , KI and H2S ?
why in (MnO4) 1- all bonds formed between Mn and O2 are covalent????
Why Zr and Hf have identical sizes?
CrO is basic but Cr2O3is amphoteric ?
nickel does not form low spin octahedral complexes
What does M2+/M and M3+/M2+ mean?
La(OH)3 is more basic than Lu(OH)3. Give reason...
Mn3+ and Co3+ ions are the strongest oxidising agents in aqueous solution.
WHy?
what is difference between valency and oxidation state with egs and detail.
Explain the chemistry behind chromyl chloride test.
transition elements form alloys
Cr2+ is a stronger reducing agent than Fe2+ .why?
plz ans in short
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?
i agree that V2+ is more stable than V3+, but what is the main reason behind it ?
hcl is not used to acidify a permanganate solution in volumetric estimation of Fe+ or C2O42-
What is meant by disproportionation? Give one example of disproportionation reaction in aqueous solution.
Why Sc can't form MO oxides
cu2+ is coloured but cu+ is not and sc2+ is colured but sc3+ is not why????
Explain giving reasons:
(i) Transition metals and many of their compounds show paramagnetic
behaviour.
(ii) The enthalpies of atomisation of the transition metals are high.
(iii) The transition metals generally form coloured compounds.
(iv) Transition metals and their many compounds act as good catalyst.
Describe 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
Ce3+ is easily oxidised to Ce4+. WHY?
The e value for copper is positive (+ 0.34V). What is possible reason for this?
which is stronger reducing agent fe2+ or cr2+ and why???
Interstitial compounds are chemically inert but retain their metallic ocnductivity.
Explian why.
Why are transition metals good catalysts??
Give reason-
Europium(II) is more stable trhan Cerium (II)
Why the third ionisation enthalpy of Mn is generally exceptionally high?
I don't understand the topic 'Chemical Reactivity and Eo values. Pls Explain urgently!!!.
Thanks for ur help.
Why do Mn & Tc have low melting points?
lanthanoids form primarily +3 ions, while the actinoids usually have higher oxidation states in their compounds, +4 or even +6 being typical. why?
How does the colour of K2Cr2O7 solution depends on pH of the solution?
why transition metals in low oxidation states act as acids...???plzzz explain...
The electrode potential for Fe3+/Fe2+ is positive. But in Fe 3+ oxidation it is at stable half filled configuaration so why Fe3+ wants to reduce it self to Fe2+
according to me the electrode potential should be negetive.
Cr3+ is most stable ion in aqueous solution. Why?
which has poor shielding effect 4f or 5f ?
ans fast plzzzzzzz
what is exchange energy and reorgnisation energy???
Transition metals exhibits higher oxidation state in oxides and fluorides WHY?
why are scandium salts white in colour
In each group, the highest oxidation state increases with the increase in atomic number; reaches the maximum in the middle, and then starts decreasing.
Why?
Why do transition elements have high melting & boiling point?
why metal metal bonding is more frequent for the 4d and the 5d series of transtion metals than that for the 3d series????????????
what does transition metals have low volatility mean?
why Transition elements show highest oxidation state in their oxides thanfluorides?
Account for the following statements:
a. The difference in the ionization energies between any two successive d-block elements is less than the difference in case of successive s-block elements.
What is lanthanoid contraction & what ar the consequences of lanthanoid contraction?
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Syllabus
Transition metals have high enthalpies of atomization.
Why does the ionisation enthalpy of V is less than Ti ?
Explain why Cr2+ is reducing but Mn3+ is oxidising while both ions have d4 configuration?
2. Why does iron have higher first ionization enthalpy than that of cobalt ????. 3. Why does Nickel have lower 1st ionization enthalpy than that of cobalt......?????????
why do the transition elements show variable oxidation states?
why iron does not exibit +5 oxidation state ?
Zn salts are white while Cu2+ salts are coloured. WHY?
.La3+ (Z=57) and Lu3+ (Z=71) do not show any coloured solution. 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?
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+
what is lanthanoid and actinoids contraction?
why are enthalpies of atomisation of 4d and 5d series are greater than 3d series?
Co2+ is easily oxidised to Co3+ ion in the presence of ligands .WHY?
why (MnO4)2- is paramagnetic and (MnO4)1- is dimaganetic
what is meant by poor shielding effect ?
WHY FOR ELECTRONIC CONFIG OF f BLOCK ELEMENTS, {(n-1)d 0-1} d has only 0-1 electrons? why can't it have 2 or more?
IUPAC NAME OF K3[Al(C2O4)3]
why is scandium(2) virtually unknown
describe the preparation of k2cr2o7 from chromite ore and explain the reaction of k2cr2o7 with acid FeSo4 , KI and H2S ?
why in (MnO4) 1- all bonds formed between Mn and O2 are covalent????
Why Zr and Hf have identical sizes?
CrO is basic but Cr2O3is amphoteric ?
nickel does not form low spin octahedral complexes
What does M2+/M and M3+/M2+ mean?
La(OH)3 is more basic than Lu(OH)3. Give reason...
Mn3+ and Co3+ ions are the strongest oxidising agents in aqueous solution.
WHy?
what is difference between valency and oxidation state with egs and detail.
Explain the chemistry behind chromyl chloride test.
A) Zn
B) Sc
C)Cd
D) Hg
transition elements form alloys
Cr2+ is a stronger reducing agent than Fe2+ .why?
plz ans in short
Describe preparation of KMnO4 from pyrolusite.
(i) In general the atomic radii of transition elements decrease with atomic number in a given series.
(ii) The for copper is positive (+0.34V). Copper is the only metal in the first series of transition elements showing this type of behaviour.
(iii) The E0 value of Mn3+/Mn2+ couple is much more positive than Cr3+/Cr2+ or Fe3+/Fe2+ couple.
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?
i agree that V2+ is more stable than V3+, but what is the main reason behind it ?
hcl is not used to acidify a permanganate solution in volumetric estimation of Fe+ or C2O42-
What is meant by disproportionation? Give one example of disproportionation reaction in aqueous solution.
Why Sc can't form MO oxides
cu2+ is coloured but cu+ is not and sc2+ is colured but sc3+ is not why????
Explain giving reasons:
(i) Transition metals and many of their compounds show paramagnetic
behaviour.
(ii) The enthalpies of atomisation of the transition metals are high.
(iii) The transition metals generally form coloured compounds.
(iv) Transition metals and their many compounds act as good catalyst.
Describe 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.
Mn2+(has only half filled d orbital)
Mn(has both half filled d orbital and fully filled s orbital)
Isnt Mn more stable than Mn2+
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
Ce3+ is easily oxidised to Ce4+. WHY?
The e value for copper is positive (+ 0.34V). What is possible reason for this?
CrO3, Cr2O3 ,Cr2O4, CrO.
and why?
which is stronger reducing agent fe2+ or cr2+ and why???
Interstitial compounds are chemically inert but retain their metallic ocnductivity.
Explian why.
Why are transition metals good catalysts??
Give reason-
Europium(II) is more stable trhan Cerium (II)
Why the third ionisation enthalpy of Mn is generally exceptionally high?
I don't understand the topic 'Chemical Reactivity and Eo values. Pls Explain urgently!!!.
Thanks for ur help.
Why do Mn & Tc have low melting points?
lanthanoids form primarily +3 ions, while the actinoids usually have higher oxidation states in their compounds, +4 or even +6 being typical. why?
How does the colour of K2Cr2O7 solution depends on pH of the solution?
why transition metals in low oxidation states act as acids...???plzzz explain...
The electrode potential for Fe3+/Fe2+ is positive. But in Fe 3+ oxidation it is at stable half filled configuaration so why Fe3+ wants to reduce it self to Fe2+
according to me the electrode potential should be negetive.
Cr3+ is most stable ion in aqueous solution. Why?
which has poor shielding effect 4f or 5f ?
ans fast plzzzzzzz
what is exchange energy and reorgnisation energy???
Transition metals exhibits higher oxidation state in oxides and fluorides WHY?
why are scandium salts white in colour
In each group, the highest oxidation state increases with the increase in atomic number; reaches the maximum in the middle, and then starts decreasing.
Why?
Why do transition elements have high melting & boiling point?
why metal metal bonding is more frequent for the 4d and the 5d series of transtion metals than that for the 3d series????????????
what does transition metals have low volatility mean?
why Transition elements show highest oxidation state in their oxides thanfluorides?
Account for the following statements:
a. The difference in the ionization energies between any two successive d-block elements is less than the difference in case of successive s-block elements.
What is lanthanoid contraction & what ar the consequences of lanthanoid contraction?