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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 (MnO4)2- is paramagnetic and (MnO4)1- is dimaganetic
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?
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+
Mn3+ and Co3+ ions are the strongest oxidising agents in aqueous solution.
what is lanthanoid and actinoids contraction?
.La3+ (Z=57) and Lu3+ (Z=71) do not show any coloured solution. why?
Co2+ is easily oxidised to Co3+ ion in the presence of ligands .WHY?
what is meant by poor shielding effect ?
Why Sc can't form MO oxides
IUPAC NAME OF K3[Al(C2O4)3]
As the oxidation number of a metal increases, ionic character decreases. why ?
describe the preparation of k2cr2o7 from chromite ore and explain the reaction of k2cr2o7 with acid FeSo4 , KI and H2S ?
CrO is basic but Cr2O3is amphoteric ?
Why Zr and Hf have identical sizes?
name the metal of the first row, transition series that has max. no. of unpaired electrons in it's ground state.
nickel does not form low spin octahedral complexes
why are enthalpies of atomisation of 4d and 5d series are greater than 3d series?
La(OH)3 is more basic than Lu(OH)3. Give reason...
why Zn,Cd,Hg are known as pseudo transition elements?
what is difference between valency and oxidation state with egs and detail.
Europium(II) is more stable trhan Cerium (II)
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!!
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 ?
whyscandium is notincluded in the series of standard electrode potential.
why is ferric chloride preferred over potassium chloride in case of a cut leading to bleeding?
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.
which is having more energy ns or (n-1)d subshell ?
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????
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.
which is more stable V3+or V2+ & why?
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?
why iron does not exibit +5 oxidation state ?
which is stronger reducing agent fe2+ or cr2+ and why???
Copper has a high energy of atomisation and low hydration energy.
Why are transition metals good catalysts??
what does transition metals have low volatility mean?
hcl is not used to acidify a permanganate solution in volumetric estimation of Fe+ or C2O42-
PLZ EXPLAIN : mn has lower melting point than cr as
1) electrons are tightly held by nucleus in Mn (how?)
2) Mn has lower enthalpy of atomisation (why?)
Why the third ionisation enthalpy of Mn is generally exceptionally high?
WHY Eu2+ ,Yb2+, are strong reducing agent whereas Tb4+ is an oxidising agent?
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.
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?
reason for anomalous behaviour of Mn and Tc in case of melting point?
which has poor shielding effect 4f or 5f ?
ans fast plzzzzzzz
Transition metals exhibits higher oxidation state in oxides and fluorides WHY?
why are scandium salts white in colour
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?
The oxidation number of a metal increases than ionic character decreases. how?
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