CuCl2 is more stable than Cu2Cl2 in aqueous solution because Cu2+ is more stable than Cu+ due to its higher hydration enthalpy (ΔhydH°).
In aqueous solution, Cu+ undergoes disproportionation, as shown in the equation:
2Cu+(aq) → Cu2+(aq) + Cu(s)

A ladder of fixed length \( h \) is to be placed along the wall such that it is free to move along the height of the wall.
Based upon the above information, answer the following questions:
(iii) (b) If the foot of the ladder, whose length is 5 m, is being pulled towards the wall such that the rate of decrease of distance \( y \) is \( 2 \, \text{m/s} \), then at what rate is the height on the wall \( x \) increasing when the foot of the ladder is 3 m away from the wall?