Select Board & Class
Transition metals have high enthalpies of atomization.
Explain why Cr2+ is reducing but Mn3+ is oxidising while both ions have d4 configuration?
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 do the transition elements show variable oxidation states?
Zn salts are white while Cu2+ salts are coloured. WHY?
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. 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+
nickel does not form low spin octahedral complexes
what is lanthanoid and actinoids contraction?
Co2+ is easily oxidised to Co3+ ion in the presence of ligands .WHY?
what is meant by poor shielding effect ?
.La3+ (Z=57) and Lu3+ (Z=71) do not show any coloured solution. why?
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 the transition metal compounds of Mn(II) are almost colourless?
Why Zr and Hf have identical sizes?
The e value for copper is positive (+ 0.34V). What is possible reason for this?
La(OH)3 is more basic than Lu(OH)3. Give reason...
what is difference between valency and oxidation state with egs and detail.
Explain the chemistry behind chromyl chloride test.
Cr2+ is a stronger reducing agent than Fe2+ .why?
plz ans in short
transition elements form alloys
Describe preparation of KMnO4 from pyrolusite.
hcl is not used to acidify a permanganate solution in volumetric estimation of Fe+ or C2O42-
Why is oxygen a gas and Sulphur a solid ?
Mn3+ and Co3+ ions are the strongest oxidising agents in aqueous solution.
What is the effect of increasing pH on a solution of potassium dichromate????
plz help me in dis!!
Europium(II) is more stable trhan Cerium (II)
why is ferric chloride preferred over potassium chloride in case of a cut leading to bleeding?
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????
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 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.
Transition metals exhibits higher oxidation state in oxides and fluorides WHY?
1. In the first transition series only copper has positive electrode potential. Why?
PLEASE ANSWER AS EARLY AS POSSIBLE!!!!!!!!!!
why? .There occurs much more frequent metal-metal bonding in compounds of heavy Transition
Zn, Cd, and Hg are not regarded as transition elements and why Uub is regarded as transition elements
K2PtCl6 is known but K2NiCl6 is not known.State the reason.I guess it's to be answered comparing the stability of Pt4+ and Ni4+ but I am somehow unable to distinguish.Please help me out.
Why are transition metals good catalysts??
Ce3+ is easily oxidised to Ce4+. WHY?
why are enthalpies of atomisation of 4d and 5d series are greater than 3d series?
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 the third ionisation enthalpy of Mn is generally exceptionally high?
Pyrolusite (MnO2) on k green compound heating with KOH in the presence of air gives a dark green compound(A).The solution of (A) on passing chlorine gas gives a purple coloured compound (B); compound B gives the following reactions.
KI on reaction with alkaline solution of (B) changes into a compound of (C).
The colour of the compound is discharged on treatment with the acidic solution of FeSO4.
With conc.H2SO4 compound (B) gives (D) decomposes to yield (E) and oxygen.
Identify (A), (B), (C), (D) and (E) and write balanced chemical equations for the formation of (A) and (B) and for steps 1) to 3).
Why do Mn & Tc have low melting points?
there is general increase in the density from titanium to zinc why?
How would you account for the increasing oxidising power in series VO2+ < Cr2O72- < MnO4- ?
How does the colour of K2Cr2O7 solution depends on pH of the solution?
when H2S is passed through dilute K2Cr2O7 milkiness appears
ans fast plzzzzzzz
CrO is basic but Cr2O3is amphoteric ?
Cr3+ is most stable ion in aqueous solution. Why?
which has poor shielding effect 4f or 5f ?
why are scandium salts white in colour
WHY Eu2+ ,Yb2+, are strong reducing agent whereas Tb4+ is an oxidising agent?
What is lanthanoid contraction & what ar the consequences of lanthanoid contraction?
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 is enthalpy of atomisation ?
why Transition elements show highest oxidation state in their oxides thanfluorides?
WRite the electronic configuration of ti4+ ion
Copyright © 2019 Applect Learning Systems Pvt. Ltd. All rights reserved.
E.g: 9876543210, 01112345678
We will give you a call shortly, Thank You
Office hours: 9:00 am to 9:00 pm IST (7 days a week)