Advertisements
Advertisements
Questions
Explain why Cu+ ion is not stable in aqueous solutions?
Out of Cu+ and Cu2+, which ion is unstable in aqueous solution and why?
Solution
\[\ce{Cu^{2+}_{ (aq)}}\] is more stable than \[\ce{Cu^{+}_{ (aq)}}\]. This is because copper has a higher second ionization enthalpy, but ΔhydH for \[\ce{Cu^{2+}_{ (aq)}}\] is more negative than that for \[\ce{Cu^{+}_{ (aq)}}\], so it compensates more for the second ionization enthalpy of copper. Thus many copper (I) compounds are unstable in aqueous solution and are disproportionated as follows:
\[\ce{2Cu^{+}_{ (aq)} -> Cu^{2+}_{ (aq)} + Cu_{(s)}}\]
APPEARS IN
RELATED QUESTIONS
Why do interstitial compounds have higher melting points than corresponding pure metals?
Calculate magnetic moment of `Fe_((aq))^(2+) ion (Z=26).`
In 3d series (Sc to Zn), which element has the lowest enthalpy of atomisation and why?
In the series Sc (Z = 21) to Zn (Z = 30), the enthalpy of atomization of zinc is the lowest, i.e., 126 kJ mol−1. Why?
How would you account for the following:
Of the d4 species, Cr2+ is strongly reducing while manganese (III) is strongly oxidising.
Explain why transition metals and their compounds act as a catalyst.
Maximum oxidation state is shown by ____________.
Electronic configuration of a transition element X in +3 oxidation state is [Ar]3d5. What is its atomic number?
Which of the following statements is not correct?
Why first ionisation enthalpy of Cr is lower than that of Zn?
When an oxide of manganese (A) is fused with KOH in the presence of an oxidising agent and dissolved in water, it gives a dark green solution of compound (B). Compound (B) disproportionates in neutral or acidic solution to give purple compound (C). An alkaline solution of compound (C) oxidises potassium iodide solution to a compound (D) and compound (A) is also formed. Identify compounds A to D and also explain the reactions involved.
Which of the following is non-metallic?
If enthalpies of formation of C2H4(g), CO2(g) and H2O(l) at 25°C and 1 atm pressure are 52, – 394 and – 286 kJ/mol respectively, the change in ethalpy for combustion of C2H4 is equal to
Catalytic hydrogenation of benzene gives
On adding NaOH, solution to the aqueous solution of K2CrO7 the colour of the solution changes from
Which of the following characteristics of transition metals is associated with their catalytic activity?
The given graph shows the trends in melting points of transition metals:
Explain the reason why Cr has the highest melting point and manganese (Mn) has a lower melting point.
Write the ionic equation for reaction of KI with acidified KMnO4.
A coordination compound has the formula \[\ce{CoCl3.4NH3}\]. It precipitates silver ions as AgCl and its molar conductance corresponds to a total of two ions.
Based on this information, answer the following question:
- Deduce the structural formula of the complex compound.
- Write the IUPAC name of the complex compound.
- Draw the geometrical isomers of the complex compound.
Give a reason for the following.
Some transition metals and their compounds get attracted towards the magnetic field.
