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

Why does copper not replace hydrogen from acids?

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प्रश्न

Why does copper not replace hydrogen from acids?

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उत्तर

The value of standard reduction potential of copper (E° = + 0.34 V) is positive. Therefore, copper does not liberate hydrogen from acids.

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पाठ 8: The d-and f-Block Elements - Multiple Choice Questions (Type - I) [पृष्ठ १११]

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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 32 | पृष्ठ १११

संबंधित प्रश्‍न

Why do interstitial compounds have higher melting points than corresponding pure metals?


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)


ln which pair highest oxidation states of transition metals are found:


The elements of 3d transition series are given as: Sc Ti V Cr Mn Fe Co

Answer the following: Which element is a strong oxidising agent in +3 oxidation state and why?


How is the variability in oxidation states of transition metals different from that of the non-transition metals? Illustrate with examples.


Calculate the number of unpaired electrons in the following gaseous ions:

Mn3+, Cr3+, V3+ and Ti3+. Which one of these is the most stable in an aqueous solution?


Compare the general characteristics of the first series of the transition metals with those of the second and third series metals in the respective vertical columns. Give special emphasis on the following point:

Electronic configurations


Complete and balance the following chemical equations

`Fe^(2+) + MnO_4^(-) + H^+ ->`


Why does the density of transition elements increase from Titanium to Copper? (at. no. Ti = 22, Cu = 29)


In lake test for Al3+ ions, there is the formation of coloured ‘floating lake’. It is due to ______.


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


A solution of \[\ce{KMnO4}\] on reduction yields either a colourless solution or a brown precipitate or a green solution depending on pH of the solution. What different stages of the reduction do these represent and how are they carried out?


Match the properties given in Column I with the metals given in Column II.

  Column I (Property) Column II (Metal)
(i) Element with highest second
ionisation enthalpy
(a) \[\ce{Co}\]
(ii) Element with highest
third ionisation enthalpy
(b) \[\ce{Cr}\]
(iii) \[\ce{M}\] in \[\ce{M(CO)6}\] is (c) \[\ce{Cu}\]
(iv) Element with highest heat
of atomisation
(d) \[\ce{Zn}\]
    (e) \[\ce{Ni}\]

Identify A to E and also explain the reactions involved.


Why are fluorides of transition metals more stable in their higher oxidation state as compared to the lower oxidation state?


Sodium this sulphate is used in photography because of its:-


Account for the following:

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


Write the ionic equation for reaction of KI with acidified KMnO4.


A pair of coloured ions is ______.


Why are interstitial compounds well known for transition metals?


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