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Transition metals have high enthalpies of atomization.
Explain why Cr2+ is reducing but Mn3+ is oxidising while both ions have d4 configuration?
why do the transition elements show variable oxidation states?
Zn salts are white while Cu2+ salts are coloured. WHY?
CrO is basic but Cr2O3is amphoteric ?
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?
Mn3+ and Co3+ ions are the strongest oxidising agents in aqueous solution.
WHy?
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?
Co2+ is easily oxidised to Co3+ ion in the presence of ligands .WHY?
i agree that V2+ is more stable than V3+, but what is the main reason behind it ?
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 ?
why are enthalpies of atomisation of 4d and 5d series are greater than 3d series?
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...
.La3+ (Z=57) and Lu3+ (Z=71) do not show any coloured solution. why?
what is difference between valency and oxidation state with egs and detail.
Explain the chemistry behind chromyl chloride test.
why (MnO4)2- is paramagnetic and (MnO4)1- is dimaganetic
transition elements form alloys
Cr2+ is a stronger reducing agent than Fe2+ .why?
plz ans in short
Transition metals exhibits higher oxidation state in oxides and fluorides WHY?
Describe preparation of KMnO4 from pyrolusite.
What does M2+/M and M3+/M2+ mean?
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 ?
which has poor shielding effect 4f or 5f ?
why is ferric chloride preferred over potassium chloride in case of a cut leading to bleeding?
5f, 6d, and 7ssubshells are of comparable energies. what does it mean
Hydration enthalpy of cu2+ is high. Why ?
What is meant by disproportionation? Give one example of disproportionation reaction in aqueous solution.
why iron does not exibit +5 oxidation state ?
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.
which is more stable V3+or V2+ & why?
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
why Zn,Cd,Hg are known as pseudo transition elements?
Ce3+ is easily oxidised to Ce4+. WHY?
The e value for copper is positive (+ 0.34V). What is possible reason for this?
hcl is not used to acidify a permanganate solution in volumetric estimation of Fe+ or C2O42-
Why are transition metals good catalysts??
WHY ONLY MERCURY EXIST AS LIQUID AT ROOM TEMPERATURE, BUT ELEMENTS LIKE Zn Cd ARE SOLID AT ROOM TEMPERATURE?
which is stronger reducing agent fe2+ or cr2+ and why???
Give reason-
Europium(II) is more stable trhan Cerium (II)
what is re-organisation energy in transition elements..and how is this related to ionisation enthalpies of these elements..??
Why the third ionisation enthalpy of Mn is generally exceptionally high?
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?
Why do Mn & Tc have low melting points?
How does the colour of K2Cr2O7 solution depends on pH of the solution?
Cr3+ is most stable ion in aqueous solution. 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.
ans fast plzzzzzzz
why Ti,V,AND Cr stong reducing agents.plz rply fast
It says that the electrode potential values of Mn, Zn and Ni is more negative that claculated.
I understood why it is for Mn and Zn, but why is it for Ni?
why are scandium salts white in colour
Why do transition elements have high melting & boiling point?
there is any trik to learn d- block element(any one have then told me)
why metal metal bonding is more frequent for the 4d and the 5d series of transtion metals than that for the 3d series????????????
Why Sc can't form MO oxides
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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Syllabus
Transition metals have high enthalpies of atomization.
Explain why Cr2+ is reducing but Mn3+ is oxidising while both ions have d4 configuration?
why do the transition elements show variable oxidation states?
Zn salts are white while Cu2+ salts are coloured. WHY?
CrO is basic but Cr2O3is amphoteric ?
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?
Mn3+ and Co3+ ions are the strongest oxidising agents in aqueous solution.
WHy?
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+
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......?????????
what is lanthanoid and actinoids contraction?
Co2+ is easily oxidised to Co3+ ion in the presence of ligands .WHY?
i agree that V2+ is more stable than V3+, but what is the main reason behind it ?
what is meant by poor shielding effect ?
IUPAC NAME OF K3[Al(C2O4)3]
(1) 3, 2 (2) 2, 3 (4) 4, 1 (4) 5,0
Could you please explain answer with structure?(Answer is 4, 1)
describe the preparation of k2cr2o7 from chromite ore and explain the reaction of k2cr2o7 with acid FeSo4 , KI and H2S ?
why are enthalpies of atomisation of 4d and 5d series are greater than 3d series?
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...
.La3+ (Z=57) and Lu3+ (Z=71) do not show any coloured solution. why?
what is difference between valency and oxidation state with egs and detail.
Explain the chemistry behind chromyl chloride test.
why (MnO4)2- is paramagnetic and (MnO4)1- is dimaganetic
transition elements form alloys
Cr2+ is a stronger reducing agent than Fe2+ .why?
plz ans in short
Transition metals exhibits higher oxidation state in oxides and fluorides WHY?
Describe preparation of KMnO4 from pyrolusite.
What does M2+/M and M3+/M2+ mean?
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 ?
which has poor shielding effect 4f or 5f ?
why is ferric chloride preferred over potassium chloride in case of a cut leading to bleeding?
5f, 6d, and 7ssubshells are of comparable energies. what does it mean
Hydration enthalpy of cu2+ is high. Why ?
What is meant by disproportionation? Give one example of disproportionation reaction in aqueous solution.
why iron does not exibit +5 oxidation state ?
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.
which is more stable V3+or V2+ & why?
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 Sc
2 Mn
3 Fe
4 Zn
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
why Zn,Cd,Hg are known as pseudo transition elements?
Ce3+ is easily oxidised to Ce4+. WHY?
The e value for copper is positive (+ 0.34V). What is possible reason for this?
hcl is not used to acidify a permanganate solution in volumetric estimation of Fe+ or C2O42-
Why are transition metals good catalysts??
WHY ONLY MERCURY EXIST AS LIQUID AT ROOM TEMPERATURE, BUT ELEMENTS LIKE Zn Cd ARE SOLID AT ROOM TEMPERATURE?
which is stronger reducing agent fe2+ or cr2+ and why???
Give reason-
Europium(II) is more stable trhan Cerium (II)
what is re-organisation energy in transition elements..and how is this related to ionisation enthalpies of these elements..??
the irregular trend in the first ionisation enthalpy of the 3d metals can be accounted for by considering that the removal of one electron alters the relative energies of 4s and 3d orbitals. so the unipositive ions have dn configurations with no 4s electron. there is thus, a reorganisation energy accompanying ionisation with some gains in exchange energy as the no. of electrons increases and from the transference of s into d orbitals...
Why the third ionisation enthalpy of Mn is generally exceptionally high?
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?
Why do Mn & Tc have low melting points?
How does the colour of K2Cr2O7 solution depends on pH of the solution?
Q. In which of the following sets do all the three compounds have bonds that are mainly ionic ?
(1) NaCl, NCl3 , CCl4
(2) CsBr , BaBr2 , SrO
(3) CsF , BF3 , NH3
(4) Al2O3 , CaO , SO2
Cr3+ is most stable ion in aqueous solution. 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.
ans fast plzzzzzzz
why Ti,V,AND Cr stong reducing agents.plz rply fast
It says that the electrode potential values of Mn, Zn and Ni is more negative that claculated.
I understood why it is for Mn and Zn, but why is it for Ni?
why are scandium salts white in colour
Why do transition elements have high melting & boiling point?
there is any trik to learn d- block element(any one have then told me)
why metal metal bonding is more frequent for the 4d and the 5d series of transtion metals than that for the 3d series????????????
Why Sc can't form MO oxides
why Transition elements show highest oxidation state in their oxides thanfluorides?
What is lanthanoid contraction & what ar the consequences of lanthanoid contraction?