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कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान 2nd PUC Class 12

Identify A to E and also explain the reactions involved.

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प्रश्न

Identify A to E and also explain the reactions involved.

दीर्घउत्तर
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उत्तर

A = \[\ce{Cu}\]

B = \[\ce{Cu(NO3)2}\]

C = \[\ce{[Cu(NH3)4]}\]

D = \[\ce{CO2}\]

E = \[\ce{CaCO3}\]

F = \[\ce{Cu2[Fe(CN)6]}\]

G = \[\ce{Ca (HCO3)2}\]

\[\ce{CuCO3 -> CuO + CO2}\]

\[\ce{CuO + CuS -> \underset{(A)}{Cu} + SO2}\]

\[\ce{Cu + 4HNO3 (Conc) -> Cu \underset{(B)}{(NO3)2} + 2NO + 2H2O}\]

\[\ce{\underset{(B)}{Cu^2+} + NH3 -> \underset{(C)}{[Cu(NH3)4]}}\]

\[\ce{Ca(OH)2 + \underset{(D)}{CO2} -> \underset{(E)}{CaCO3} + H2O}\]

\[\ce{CaCO3 + CO2 + H2O -> Ca(HCO3)2}\]

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पाठ 8: The d-and f-Block Elements - Multiple Choice Questions (Type - I) [पृष्ठ ११४]

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एनसीईआरटी एक्झांप्लर Chemistry Exemplar [English] Class 12
पाठ 8 The d-and f-Block Elements
Multiple Choice Questions (Type - I) | Q 64 | पृष्ठ ११४

संबंधित प्रश्‍न

Which of the following cations are coloured in aqueous solutions and why ?

Sc3+, V3+, Ti4+, Mn2+ (At. Nos. Sc = 21, V = 23, Ti = 22, Mn = 25)


 
 
 

Complete the following chemical equations:

`(i) Cr_2O_7^(2-)+6Fe^(2+)+14H^+ ->`

`(ii) 2CrO_4^(2-)+2H^+ ->`

`(iii) 2MnO_4^-+5C_2O_4^(2-)+16H^+ ->`

 
 
 

Account for the following:

Zn is not considered as a transition element.


Why is the highest oxidation state of a metal exhibited in its oxide or fluoride only?


What are the characteristics of the transition elements and why are they called transition elements?


In what way is the electronic configuration of the transition elements different from that of the non-transition elements?


Describe the oxidising action of potassium dichromate and write the ionic equation for its reaction with iodide.


Write the factors which are related to the colour of transition metal ions.


Write the formula of an oxo-anion of Chromium (Cr) in which it shows the oxidation state equal to its group number


Which among the following transition metal has the lowest melting point?


Read the passage given below and answer the following question:

The transition metals when exposed to oxygen at low and intermediate temperatures form thin, protective oxide films of up to some thousands of Angstroms in thickness. Transition metal oxides lie between the extremes of ionic and covalent binary compounds formed by elements from the left or right side of the periodic table. They range from metallic to semiconducting and deviate by both large and small degrees from stoichiometry. Since electron bonding levels are involved, the cations exist in various valence states and hence give rise to a large number of oxides. The crystal structures are often classified by considering a cubic or hexagonal close-packed lattice of one set of ions with the other set of ions filling the octahedral or tetrahedral interstices. The actual oxide structures, however, generally show departures from such regular arrays due in part to distortions caused by packing of ions of different size and to ligand field effects. These distortions depend not only on the number of d-electrons but also on the valence and the position of the transition metal in a period or group.

In the following questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices on the basis of the above passage.

Assertion: Crystal structure of oxides of transition metals often show defects.

Reason: Ligand field effect cause distortions in crystal structures.


When \[\ce{KMnO4}\] solution is added to oxalic acid solution, the decolourisation is slow in the beginning but becomes instantaneous after some time because ______.


Match the catalysts given in Column I with the processes given in Column II.

Column I (Catalyst) Column II (Process)
(i) \[\ce{Ni}\] in the presence of hydrogen (a) Zieglar Natta catalyst
(ii) \[\ce{Cu2C12}\] (b) Contact process
(iii) \[\ce{V2O5}\] (c) Vegetable oil to ghee
(iv) Finely divided iron (d) Sandmeyer reaction
(v) \[\ce{TiCl4 + Al (CH3)3}\] (e) Haber's Process
  (f) Decomposition of KCIO3

Identify the metal and justify your answer.

Carbonyl \[\ce{M(CO)5}\]


Transition metals can act as catalysts because these can change their oxidation state. How does \[\ce{Fe(III)}\] catalyse the reaction between iodide and persulphate ions?


The orientation of an atomic orbital is governed by


The standard electrode potentials of four elements A, B, C and D are – 3.05, – 1.66, – 0.40 and + 0.80. The highest chemical reactivity will be exhibited by


Account for the following:

Eu2+ with electronic configuration [Xe]4f76s2 is a strong reducing agent.


Give a reason for the following:

Transition metals possess a great tendency to form complex compounds.


For M2+/M and M3+/M2+systems, the EΘ values for some metals are as follows:

Cr2+/Cr −0.9 V
Mn2+/Mn −1.2 V
Fe2+/Fe −0.4 V
Cr3/Cr2+ −0.4 V
Mn3+/Mn2+ +1.5 V
Fe3+/Fe2+ +0.8 V

Use this data to comment upon:

The ease with which iron can be oxidised as compared to a similar process for either chromium or manganese metal.


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