Which from following pairs of solutions in water exhibits same osmotic pressure at same temperature?

[molar mass of urea $=60 \mathrm{~g} \mathrm{~mol}^{-1}$, sucrose $=342 \mathrm{~g} \mathrm{~mol}^{-1}$ ]

Identify glycosidic linkage in maltose.

Which lanthanoid from following has highest ionisation $\left(\mathrm{IE}_1\right)$ enthalpy?

For a reaction $\mathrm{A} \rightarrow$ Product, rate constant is $6.93 \times 10^{-3}$ hour ${ }^{-1}$. What is order of reaction?