
Hydration reactions often involve the addition of water molecules to stabilize reactive intermediates




The reaction involves hydration followed by rearrangement:
• The given structure undergoes hydration, leading to the addition of hydroxyl (−OH) groups.
• Hydrogen bonding stabilizes the structure, resulting in the product OH−O−OH
The correct option is(D): 
The colour of the solution observed after about 1 hour of placing iron nails in copper sulphate solution is:
In the given figure, the blocks $A$, $B$ and $C$ weigh $4\,\text{kg}$, $6\,\text{kg}$ and $8\,\text{kg}$ respectively. The coefficient of sliding friction between any two surfaces is $0.5$. The force $\vec{F}$ required to slide the block $C$ with constant speed is ___ N.
(Given: $g = 10\,\text{m s}^{-2}$) 
Two circular discs of radius \(10\) cm each are joined at their centres by a rod, as shown in the figure. The length of the rod is \(30\) cm and its mass is \(600\) g. The mass of each disc is also \(600\) g. If the applied torque between the two discs is \(43\times10^{-7}\) dyne·cm, then the angular acceleration of the system about the given axis \(AB\) is ________ rad s\(^{-2}\).
