AIEEE 2007 PYQ Mock Test

A $5.25\%$ solution of a substance is isotonic with a $1.5\%$ solution of urea (molar mass $=60{\text{g mol}}^{-1}$) in the same solvent. If the densities of both the solutions are assumed to be equal to $1.0{\text{g cm}}^{-3}$, molar mass of the substance will be:

Assuming that water vapour is an ideal gas, the internal energy change ($\Delta U$) when $1\text{mol}$ of water is vapourised at $1\text{bar}$ pressure and $100^{\circ }\text{C}$ is:(Given: Molar enthalpy of vapourization of water at $1\text{bar}$ and $373\text{K}=41{\text{kJ mol}}^{-1}$ and $R=8.3{\text{J mol}}^{-1}{\text{K}}^{-1}$)

If the solubility product constant $K_{sp}$ of ${\text{AgIO}}_3$ at a given temperature is $1.0\times 10^{-8}$, what is the mass of ${\text{AgIO}}_3$ contained in $100\text{mL}$ of its saturated solution? (Molar mass of ${\text{AgIO}}_3=283\text{g/mol}$)

A radioactive element gets spilled over the floor of a room. Its half-life period is $30\text{days}$. If the initial activity is ten times the permissible value, after how many days will it be safe to enter the room?

Which one of the following conformations of cyclohexane is chiral?