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Transition metals have high enthalpies of atomization.
CrO is basic but Cr2O3is amphoteric ?
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?
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?
Transition metals exhibits higher oxidation state in oxides and fluorides 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?
why are scandium salts white in colour
Co2+ is easily oxidised to Co3+ ion in the presence of ligands .WHY?
what is meant by poor shielding effect ?
The e value for copper is positive (+ 0.34V). What is possible reason for this?
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 Zr and Hf have identical sizes?
reason for anomalous behaviour of Mn and Tc in case of melting point?
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.
the d orbitals of th transition elements project to the periphery od an atom more than the other orbitals ( s and p ) hence they are more influences by the surroundings as well as affecting the atoms and molecules surrounding them.....WHAT DOES THIS MEAN ??? (this statement is given in the ncert)
transition elements form alloys
Cr2+ is a stronger reducing agent than Fe2+ .why?
plz ans in short
Mn3+ and Co3+ ions are the strongest oxidising agents in aqueous solution.
Describe preparation of KMnO4 from pyrolusite.
What is the effect of increasing pH on a solution of potassium dichromate????
plz help me in dis!!
i agree that V2+ is more stable than V3+, but what is the main reason behind it ?
Why is oxygen a gas and Sulphur a solid ?
why Zn,Cd,Hg are known as pseudo transition elements?
why is ferric chloride preferred over potassium chloride in case of a cut leading to bleeding?
In a transition series of metals the metal which exhibits the greatest no. Of oxidation states occurs in the middle of the series
What is meant by disproportionation? Give one example of disproportionation reaction in aqueous solution.
what do you mean by negative and positive enthalpy of hydration?
cu2+ is coloured but cu+ is not and sc2+ is colured but sc3+ is not why????
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.
Arrange the following groups of substances in the order of the property indicated against each group :
NH3, PH3, AsH3, SbH3 – increasing order of boiling points.
O, S, Se, Te – increasing order of electron gain enthalpy with negative sign.
F2, Cl2, Br2, I2 – increasing order of bond dissociation enthalpy.
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
Europium(II) is more stable trhan Cerium (II)
Ce3+ is easily oxidised to Ce4+. WHY?
hcl is not used to acidify a permanganate solution in volumetric estimation of Fe+ or C2O42-
Why are transition metals good catalysts??
Q- why the melting point of manganese is less than chromium if their d orbital is halffilled
which is stronger reducing agent fe2+ or cr2+ and why???
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.
why (MnO4)2- is paramagnetic and (MnO4)1- is dimaganetic
The 2nd and 3rd transition series elements have very similar atomic radii. WHY?
Why the third ionisation enthalpy of Mn is generally exceptionally high?
why in (MnO4) 1- all bonds formed between Mn and O2 are covalent????
Why do Mn & Tc have low melting points?
How does the colour of K2Cr2O7 solution depends on pH of the solution?
Unlike Cr3+. Mn2+, Fe3+ & the subsequent other M2+ ions of the 3d series of elements, the 4d & the 5d series metals generally do not form stable cationic species.Give reason in brief.......ans quick
2nd nd 3rd transition series have higher enthalpies of atomisation compared to 1 series.y??
Cr3+ is most stable ion in aqueous solution. Why?
which has poor shielding effect 4f or 5f ?
ans fast plzzzzzzz
why ionic character decreases on increase in oxidation state
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????????????
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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