Assign reasons for the following : (i) Copper (I) ion is not known in aqueous solution.

Monjur Alahi

Assign reasons for the following :
(i) Copper (I) ion is not known in aqueous solution.
(ii) Actinoids exhibit greater range of oxidation states than lanthanoids.


0 like 0 dislike
1 views
Share with your friends

1 Answers

Salim Ahmed Kawsar

Call

(i) In aqueous solution Cu+ undergoes disproportionation to form a more stable Cu2+ ion.

2Cu+(aq) → 2Cu2+(aq) + Cu(s)

The higher stability of Cu2+ in aqueous solution may be attributed to its greater negative ∆ hydH° than that of Cu+. It compensates the second ionization enthalpy of Cu involved in the formation of Cu2+ ions.

(ii) Actinoids exhibit greater range of oxidation states than lanthanoids. This is because there is less energy difference between 5f and 6d orbitals belonging to actinoids than the energy difference between 4f and 5d orbitals in case of lanthanoids.

0 like 0 dislike
1 views
Talk Doctor Online in Bissoy App
Which of the following will show “Tyndall effect”? (a)Salt solution (b)Milk (c) Copper sulphate solution (d)Starch solution.

(b) and (d) are colloids and will show Tyndall Effect.

1 Answers 1 views
Give reasons: NaCl is not a conductor of electricity in solid state whereas it does conduct electricity in aqueous solution

In solid NaCl, the movement of ions is not possible due to its rigid structure but in aqueous solution or molten state, the ions can move freely. These free ions...

1 Answers 1 views
FeSO4 solution mixed with (NH4)2SO4 solution in 1 : 1 molar ratio gives the test of Fe^2+ ion but CuSO4 solution mixed

i. 1 : 1 molar mixture of FeSO4 and (NH4)2SO4 forms a double salt, FeSO4.(NH4)2SO4.6H2O (Mohr’s salt) which exists only in solid state. In aqueous solution, it dissociates into ions...

1 Answers 2 views
What is the coordination entity formed when excess of aqueous KCN is added to an aqueous solution of copper sulphate?

i. When excess of aqueous KCN is added to an aqueous solution of copper sulphate, the coordination entity formed is [Cu(CN)4]2 -. [Cu(H2O)4]2+ + 4CN -  →   [Cu(CN)4]2 -  + 4H2O ii. [Cu(CN)4]2- is...

1 Answers 1 views
Account for the following : (i) State the relation between hydrogen ion concentration of an aqueous solution and its pH.

(i) If H+ ion concentration is more, pH will be less and vice-versa or pH of a solution is inversely proportional to H+ ion concentration or pH 5.2 log (H+). (ii)...

1 Answers 4 views
Assign reasons for the following: (i) The enthalpies of atomisation of transition elements are high.

(i) This is because transition metals have strong metallic bonds as they have a large number of unpaired electrons. (ii) The catalytic activity of transition metals is attributed to the following...

1 Answers 1 views
Assign reasons for the following : (i) In liquid state, hydrogen chloride is a stronger acid than hydrogen fluoride.

(i) It is due to (a) Intermolecular hydrogen bonding in HF. (b) Higher H—F bond dissociation enthalpy than H—Cl. (ii) As P—P single bond (213 kJ mol-1) in P4 is much weaker than...

1 Answers 1 views
Assign reasons for each of the following: (i) Transition metals generally form coloured compounds.

(i) This is due to d-d transition. When visible (white) light falls on a transition metal compounds, they absorb certain radiation of visible light and transmit the remaining ones. The...

1 Answers 1 views
State reasons for the following: (i) Cu(I) ion is not stable in an aqueous solution.

(i) This is because Cu(I) ion is unstable in aqueous solution and undergo disproportionation. 2Cu + (aq)  → Cu2+ (aq) + Cu(s) (ii) This is because due to lanthanoid contraction the expected increase...

1 Answers 1 views
An oxidising agent is needed in the iodination of methane but not in the chlorination or bromination . Assign reason-

In the iodination of methane, H-I is also formed as the product along with iodomethane. Since it is a strong reducing agent, it reduces iodomethane back to methane and makes...

1 Answers 1 views
X