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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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संबंधित प्रश्न
ln which pair highest oxidation states of transition metals are found:
How would you account for the following : Transition metals form coloured compounds
How would you account for the irregular variation of ionization enthalpies (first and second) in the first series of the transition elements?
Compare the stability of +2 oxidation state for the elements of the first transition series.
Which metal in the first series of transition metals exhibits +1 oxidation state most frequently and why?
Why does the density of transition elements increase from Titanium to Copper? (at. no. Ti = 22, Cu = 29)
Account for the following :
Ti4+ is colourless whereas V4+ is coloured in an aqueous solutions.
Generally transition elements form coloured salts due to the presence of unpaired electrons. Which of the following compounds will be coloured in solid-state?
Identify A to E and also explain the reactions involved.
Which does not belong to first transition series?
Sodium this sulphate is used in photography because of its:-
Which of the following species has maximum magnetic momentum?
Among the following pairs of ions, the lower oxidation state in aqueous solution is more stable than the other in:-
Which of the following ions has the maximum magnetic moment?
The oxidation state of Fe in [Fe(CO)5] is ______.
Which property of transition metals enables them to behave as catalysts?
Write the ionic equation for reaction of KI with acidified KMnO4.
Give a reason for the following.
Some transition metals and their compounds get attracted towards the magnetic field.
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:
Atomic sizes
The E° value for the Mn2+/Mn2+ couple is more positive than that of Cr3+/Cr2+ or Fe3+/Fe2+ due to the change of:
