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CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
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Asked by jain.pradeep
24th February 2020,
7:28 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
Write the chemical equations for the preparation of KMnO4 from MnO2.
Asked by sanjeet.kumar
12th March 2019,
2:21 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
1) which one of l
and is not likely to exist ?
2) how does ammonia react with AgN
? Write it chemical reaction ?
3) give the disproportionation reaction of 
4) HYPOPHOSPHURUS acis is a good reducing agent . Justify with example
5) give chemical equation in support of the statement that all bonds in P
MOLECULE ARE NOT EQUIVALENT
and is not likely to exist ?? Write it chemical reaction ? MOLECULE ARE NOT EQUIVALENT
Asked by niharikapabba2605
4th August 2018,
8:20 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
Corrosion is nessesarily a chemical reaction where what all changes occur and its cell reaction is...
Asked by minipkda
22nd May 2018,
6:04 AM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
Why
(i) Oxidising power in the series :-VO2+
Asked by banga71
13th January 2018,
11:41 AM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
What are interstitial compounds? Give their characteristics.
Asked by Topperlearning User
6th June 2016,
2:05 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
Name the elements which can be used in the production of alloy steel.
Asked by Topperlearning User
6th June 2016,
2:00 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
Give two examples of interstitial compounds.
Asked by Topperlearning User
6th June 2016,
2:00 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
Metal metal bonding is more extensive in the 4d and 5d series of the transition elements than the 3d series.Explain.
Asked by Rajeev
23rd February 2016,
10:53 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
The colour of potassium dichromate solution changes with change in pH of the solution.Explain.
Asked by Rajeev
23rd February 2016,
10:48 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
The metal metal bonding is more frequently found with the second and third series of transition elements.Explain.
Asked by Rajeev
23rd February 2016,
10:42 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
Cr(II) is a stronger reducing agent than Fe(II).Explain.
Asked by Rajeev
23rd February 2016,
10:35 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
Assign reasons for the following: (i) The enthalpies of atomisation of transition elements are high. (ii) The transition metals and many of their compounds act as good catalyst. (iii) From element to element, the actinoid contraction is greater than the lanthanoid contraction. (iv) The Eo value for the Mn3+/Mn2+ couple is much more positive than that for Cr3+/Cr2+. (v) Scandium (Z = 21) does not exhibit variable oxidation states and yet it is regarded as a transition element. Or (a) What may be the possible oxidation state of the transition metals with the following d electronic configurations in the ground state of their atoms: 3d34s2, 3d54s2 and 3d64s2. Indicate relative stability of oxidation states in each case. (b) Write steps involved in the preparation of (i) Na2CrO4 from chromite ore and (ii) K2MnO4 from pyrolusite ore.
Asked by Topperlearning User
27th June 2014,
2:05 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
(a) Describe the general trends in the following properties of the first series of the transition elements: (i) Stability of +2 oxidation state (ii) Formation of oxometal ions (b) Assign reason for each of the following: (i) Transition elements exhibit variable oxidation states. (ii) Transition metal ions are usually coloured. Or (a) Write the steps involved in the preparation of: (i) K2 Cr2 O7 from Na2CrO4 (ii) KMnO4 from K2MnO4 (iii) Calomel from corrosive sublimate (b) What is meant by lanthanoid contraction? What effect does it have on the chemistry of the elements which follow lanthanoids?
Asked by Topperlearning User
27th June 2014,
10:53 AM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
Complete the following chemical equations: (i) (ii) (iii)
Asked by Topperlearning User
27th June 2014,
9:58 AM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
Asked by Topperlearning User
27th June 2014,
9:56 AM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
Give the method of preparation of potassium dichromate.
Asked by Topperlearning User
27th June 2014,
9:34 AM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
Give the commercial method for the preparation of KMnO4.
Asked by Topperlearning User
27th June 2014,
9:08 AM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
Write chemical equations for the reactions involved in the manufacture of potassium permanganate from pyrolusite ore.
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
Describe the oxidising action of potassium dichromate and write the ionic equations for its reaction with: (i) Iodide (ii) Iron (II) solution and (iii) H2S.
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
Give reaction of KMnO4 with KI in (i) Acidic medium,(ii) Alkaline medium.
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
What are alloys and how these are formed by the elements of transition metals?
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
What is the difference between manganate and permanganate ion?
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Chemistry - The d-Block and f-Block Elements
Give the name of two acidic oxide and their corresponding acid formed by the elements of 3d transition series.
Asked by Topperlearning User
4th June 2014,
1:23 PM
