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

Why does copper not replace hydrogen from acids? - Chemistry

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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 [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 metal in the first transition series (3d series) exhibits + 1 oxidation state most frequently and why?


Account for the following:

Cu+2 salts are coloured, while Zn2+ salts are white.


Comment on the statement that elements of the first transition series possess many properties different from those of heavier transition elements.


What can be inferred from the magnetic moment value of the following complex species?

Example Magnetic Moment (BM)
K2[MnCl4] 5.9

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


How is potassium dichromate prepared from chrome iron ore?


Explain why Zn2+ salts are white whereas Cu2+ salts are coloured.


Give reasons for the following:

The transition metals generally form coloured compounds.


Maximum oxidation state is shown by ____________.


Although fluorine is more electronegative than oxygen, but the ability of oxygen to stabilise higher oxidation states exceeds that of fluorine. Why?


Ionisation enthalpies of Ce, Pr and Nd are higher than Th, Pa and U. Why?


The second and third rows of transition elements resemble each other much more than they resemble the first row. Explain why?


Reactivity of transition elements decreases almost regularly from Sc to Cu. Explain.


Which of the following species has maximum magnetic momentum?


Consider the following standard electrode potential values:

\[\ce{Fe^{3+}_{ (aq)} + e^- -> Fe^{2+}_{ (aq)}}\], E0 = +0.77 V

\[\ce{MnO^{-4}_{ (aq)} + 8H^+ + 5e^- -> Mn^{2+}_{ (aq)} + 4H2O_{(l)}}\], E0 = +1.51 V

What is the cell potential for the redox reaction?


The trend of which property is represented by the following graph?


What is the oxidation state of chromium in chromate ion and dichromate ion?


A pair of coloured ions is ______.


Give a reason for the following.

Some transition metals and their compounds get attracted towards the magnetic field.


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