Select Board & Class
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?
Transition metals exhibits higher oxidation state in oxides and fluorides WHY?
why do the transition elements show variable oxidation states?
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)
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.
WHy?
what is lanthanoid and actinoids contraction?
Q- why the melting point of manganese is less than chromium if their d orbital is halffilled
Co2+ is easily oxidised to Co3+ ion in the presence of ligands .WHY?
why are scandium salts white in colour
what is meant by poor shielding effect ?
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
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?
nickel does not form low spin octahedral complexes
why iron does not exibit +5 oxidation state ?
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.
.La3+ (Z=57) and Lu3+ (Z=71) do not show any coloured solution. why?
transition elements form alloys
why are enthalpies of atomisation of 4d and 5d series are greater than 3d series?
Cr2+ is a stronger reducing agent than Fe2+ .why?
plz ans in short
Why does the ionisation enthalpy of V is less than Ti ?
Describe preparation of KMnO4 from pyrolusite.
what is the electronic configuration of Pm3+?
What is the effect of increasing pH on a solution of potassium dichromate????
plz help me in dis!!
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.
Why is oxygen a gas and Sulphur a solid ?
hcl is not used to acidify a permanganate solution in volumetric estimation of Fe+ or C2O42-
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.
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.
Cr3+ is most stable ion in aqueous solution. 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?
why Zn,Cd,Hg are known as pseudo transition elements?
The e value for copper is positive (+ 0.34V). What is possible reason for this?
Why are transition metals good catalysts??
which is stronger reducing agent fe2+ or cr2+ and why???
HOW IS V2+ A STRONG REDUCING AGENT???
Give reason-
Europium(II) is more stable trhan Cerium (II)
name the metal of the first row, transition series that has max. no. of unpaired electrons in it's ground state.
Why the third ionisation enthalpy of Mn is generally exceptionally high?
Why do Mn & Tc have low melting points?
How does the colour of K2Cr2O7 solution depends on pH of the solution?
reason for anomalous behaviour of Mn and Tc in case of melting point?
why is scandium(2) virtually unknown
which has poor shielding effect 4f or 5f ?
WHY Eu2+ ,Yb2+, are strong reducing agent whereas Tb4+ is an oxidising agent?
ans fast plzzzzzzz
whyscandium is notincluded in the series of standard electrode potential.
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?
which is more stable V3+or V2+ & why?
What is lanthanoid contraction & what ar the consequences of lanthanoid contraction?
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)
Syllabus
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?
Transition metals exhibits higher oxidation state in oxides and fluorides WHY?
why do the transition elements show variable oxidation states?
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)
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?
Q.80. Which are non-polar molecules?
I : ; II: ; III :
(1) I only
(2) II only
(3) I and II only
(4) II and III only
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.
WHy?
what is lanthanoid and actinoids contraction?
Q- why the melting point of manganese is less than chromium if their d orbital is halffilled
Co2+ is easily oxidised to Co3+ ion in the presence of ligands .WHY?
why are scandium salts white in colour
what is meant by poor shielding effect ?
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
IUPAC NAME OF K3[Al(C2O4)3]
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......?????????
describe the preparation of k2cr2o7 from chromite ore and explain the reaction of k2cr2o7 with acid FeSo4 , KI and H2S ?
CrO3, Cr2O3 ,Cr2O4, CrO.
and why?
Why Zr and Hf have identical sizes?
nickel does not form low spin octahedral complexes
why iron does not exibit +5 oxidation state ?
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.
.La3+ (Z=57) and Lu3+ (Z=71) do not show any coloured solution. why?
transition elements form alloys
why are enthalpies of atomisation of 4d and 5d series are greater than 3d series?
Cr2+ is a stronger reducing agent than Fe2+ .why?
plz ans in short
Why does the ionisation enthalpy of V is less than Ti ?
Describe preparation of KMnO4 from pyrolusite.
what is the electronic configuration of Pm3+?
What is the effect of increasing pH on a solution of potassium dichromate????
plz help me in dis!!
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.
Why is oxygen a gas and Sulphur a solid ?
hcl is not used to acidify a permanganate solution in volumetric estimation of Fe+ or C2O42-
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.
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.
(b) (i) values for the first series of transition elements are given below. Answer the question that follows:
(ii) Copper(I) ion is not known in aqueous solution.
(iii) The highest oxidation state of a metal is exhibited in its oxide.
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.
Cr3+ is most stable ion in aqueous solution. 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?
why Zn,Cd,Hg are known as pseudo transition elements?
The e value for copper is positive (+ 0.34V). What is possible reason for this?
Why are transition metals good catalysts??
which is stronger reducing agent fe2+ or cr2+ and why???
HOW IS V2+ A STRONG REDUCING AGENT???
Give reason-
Europium(II) is more stable trhan Cerium (II)
name the metal of the first row, transition series that has max. no. of unpaired electrons in it's ground state.
Why the third ionisation enthalpy of Mn is generally exceptionally high?
Why do Mn & Tc have low melting points?
(1) 1
(2)
(3) 6
(4)
How does the colour of K2Cr2O7 solution depends on pH of the solution?
reason for anomalous behaviour of Mn and Tc in case of melting point?
Mn3+
, V 3+
, Cr3+
, Ti4+
(Atomic no. : Mn = 25, V = 23, Cr = 24, Ti = 22)
(a) Which ion is most stable in an aqueous solution ?
(b) Which ion is the strongest oxidizing agent ?
(c) Which ion is colourless ?
(d) Which ion has the highest number of unpaired electrons ? (PLS EXPLAIN IN DETAIL FOR EACH AND EVERY SUB Q---PLEASE DONT SEND LINKS .....)
why is scandium(2) virtually unknown
which has poor shielding effect 4f or 5f ?
WHY Eu2+ ,Yb2+, are strong reducing agent whereas Tb4+ is an oxidising agent?
ans fast plzzzzzzz
whyscandium is notincluded in the series of standard electrode potential.
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?
which is more stable V3+or V2+ & why?
What is lanthanoid contraction & what ar the consequences of lanthanoid contraction?