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CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
Why do transition metals and their compounds show catalytic activities?
Asked by anubhutiupadhaya
27th February 2024,
4:28 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
Why d block elements forms complex compounds?
Asked by basib61203
8th February 2024,
6:03 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
copper nitrate radical test experiment for practical with proper method to write in copy
Asked by ABHILASHA
4th March 2021,
2:26 AM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
actinide and actinide contraction refers to
Asked by ghoshmahadev037
20th September 2020,
11:45 AM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
low reduction potential of iron as well as vanadium is low. why?
Asked by ABHILASHA
31st July 2020,
7:48 AM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
pls explain
Asked by mufeedatvp2000
20th April 2020,
2:53 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
please answer this
Asked by Prashant DIGHE
3rd April 2020,
10:05 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
why Hg exist in liquid state unlike other D block elements?
Asked by rohitraman1115
10th November 2019,
12:51 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
Give solubility order for alkali metal oxides.
Asked by patra04011965
25th September 2019,
10:22 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
Give solubility order for i) alkali metal bicarbonates, ii) silver halides.
Asked by patra04011965
22nd September 2019,
1:42 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
Pl ans fast ..n all the parts pl experts
Asked by jain.pradeep
30th August 2019,
8:09 AM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
Why zeff equivalent to screening effect for Fe Co and ni
Asked by Debdulal
29th August 2019,
4:46 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
Why zeff greater than screening effect for sc, ti,vn,cr and Mn
Asked by Debdulal
29th August 2019,
4:44 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
Question
Asked by ritikabehera01
7th March 2019,
9:28 AM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
A green oxide of chromium A on fusion with KOH and KNO3, gives a yellow compound B. The aqueous solution of B on acidification with diluted H2SO4 gives an Orange coloured compound C. Identify A,B,C and write down balanced chemical equations involved.
Asked by mridulabarua05
4th March 2019,
11:35 AM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
why cu 1 compounds are white and diamagnetic and cu 2 compounds are coloured and paramagnetic
Asked by jumanjigrey
12th December 2018,
7:41 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
give reason the enthalpies of atomisation of transition elements are quite high
Asked by niharikapabba2605
17th August 2018,
6:28 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
Zn, cd, hg are not consider as transition elements
Asked by 100004833798912
4th February 2018,
9:45 AM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
will Mn +2 show any colour ?
Asked by Sumesh
22nd January 2018,
7:28 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
Please provide a simple explanation regarding the electrode potential of the d block elements. What is t2g?
Asked by poojakamde3
1st December 2017,
12:17 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
What is Lanthanoid contraction and what is the factor responsible for that?
Asked by Topperlearning User
6th June 2016,
1:48 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
Cobalt(2+) is stable in aqeous solution but in the presence of complexing reagent it is strongly oxidizing. Why?
Asked by Areeba Ahmad
25th February 2015,
11:43 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
Why gold is less reactive although it have a free electron in outer most shell?
Asked by Sakender
2nd February 2015,
5:42 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
why Cr2+ is reducing while Mn3+ is oxidising while both have d4 configuration?
Asked by haider.samina
26th January 2015,
8:39 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
Why Mn in +4 State is very stable.
Asked by aaa
28th November 2014,
11:42 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
Why Mn in +4 State is very stable.
Asked by aaa
28th November 2014,
11:41 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
The 4d and 5d of transition metals have more frequent metal-metal bonding in their compounds than 3d metals
Asked by deepthy13jgd
14th November 2014,
10:23 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
what all are the reasons for the catalytic activity of transition metals.please explain in detail with some examples
Asked by Sounak das
3rd November 2014,
10:19 AM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
Does the melting and boiling point decrease as we down the group?
Asked by ADITYA MATHEW
25th October 2014,
8:51 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
KMnO4 acts as an oxidising agent in acidic ,basic and neutral medium.In which medium is the oxdising power maximum?
KMnO4 acts as an oxidising agent in acidic ,basic and neutral medium.In which medium is the oxdising power maximum?
Asked by Nishtha Sardana
14th October 2014,
11:10 AM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
cu+ has 3d10 configuration while cu2+ has 3d9,still cu2+is more stable.why?
Asked by Nishtha Sardana
14th October 2014,
11:02 AM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
1.how can we find the oxidation states of a compound when its electronic configuration is given?
2. what is standard electrode potential? how can we determine the reducing property of an element using its standard electrode potential?
3.how can we calculate the oxidising power of a given element?
4.what is the reason for irregular variation of ionisation enthalpy of 1st series of transition elements?
5.what is the meaning of less negative hydration enthalpy of cu+?
6.what is meaning of 2nd ionisation enthalpy?
7.how oxidation state determines stability of an element?
Asked by Karishma
27th September 2014,
2:05 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
How would you account for the following? (i) The atomic radii of the metals of the third (5d) series of transition elements are virtually the same as those of the corresponding members of the second (4d) series. (ii) The E0 value for the Mn3/Mn2+ couple is much more positive than that for Cr3/Cr2+ couple or Fe3+/Fe2+ couple. (iii) The highest oxidation state of a metal is exhibited in its oxide or fluoride.
Asked by Topperlearning User
27th June 2014,
8:43 AM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
Explain the following observations: (i) Generally there is an increase in density of elements from titanium (Z=22) to copper (Z=29) in the first series of transition elements. (ii) Transition elements and their compounds are generally found to be good catalysts in chemical reactions.
Asked by Topperlearning User
27th June 2014,
8:37 AM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
How would you account for the following? (i)Transition metals exhibit variable oxidation states. (ii)Zr (Z = 40) and Hf (Z = 72) have almost identical radii. (iii)Transition metals and their compounds act as catalyst. OR Complete the following chemical equations:
Asked by Topperlearning User
27th June 2014,
8:27 AM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
(a)Which metal in the first transition series (3d series) exhibits + 1 oxidation state most frequently and why? (b)Which of the following cations are coloured in aqueous solutions and why?
Asked by Topperlearning User
27th June 2014,
7:36 AM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
Asked by Topperlearning User
26th June 2014,
3:09 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
Why do the transition elements exhibit higher enthalpies of atomisation and why is enthalpy of atomisation of zinc lowest in the 3d series?
Asked by Topperlearning User
26th June 2014,
3:02 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
Which transition element of the 3d series exhibit the largest number of oxidation states and why?
Asked by Topperlearning User
26th June 2014,
1:59 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
Why Cr2+ is reducing agent and Mn3+ an oxidizing agent although both have d4 configuration?
Asked by Topperlearning User
26th June 2014,
1:27 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
Why the elements of 3d series forms coloured ions?
Asked by Topperlearning User
26th June 2014,
1:14 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
Name the compound in which Ni and Fe show zero oxidation state and Why?
Asked by Topperlearning User
26th June 2014,
1:13 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
Name the oxometal anions of the first series of the transition metals in which the metal exhibits the oxidation state equal to its group number.
Asked by Topperlearning User
26th June 2014,
12:55 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
Name the element of 3d series which has lowest enthalpy of atomisation.
Asked by Topperlearning User
26th June 2014,
11:22 AM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
How would you account for the following? (i) The atomic radii of the metals of the third (5d) series of transition elements are virtually the same as those of the corresponding members of the second (4d) series. (ii) The E0 value for the Mn3/Mn2+ couple is much more positive than that for Cr3/Cr2+ couple or Fe3+/Fe2+ couple. (iii) The highest oxidation state of a metal is exhibited in its oxide or fluoride.
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
Explain the following observations: (i) Generally there is an increase in density of elements from titanium (Z=22) to copper (Z=29) in the first series of transition elements. (ii) Transition elements and their compounds are generally found to be good catalysts in chemical reactions.
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
Which element of 3d series does not exhibit variable oxidation state?
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
Among oxygen and fluorine which one has the greater stability to stabilize high oxidation states?
Asked by Topperlearning User
4th June 2014,
1:23 PM
