The half-life of a zero order reaction $A \rightarrow$ products, is 0.5 hour. The initial concentration of $A$ is $4 \mathrm{molL}^{-1}$.

How much time (in hr ) does it take for its concentration to come from $2.0 \mathrm{~mol} \mathrm{~L}^{-1}$ to $1.0 \mathrm{~mol} \mathrm{~L}^{-1}$ ?

$$ \text { Match the following. } $$

$$ \begin{array}{llll} \hline & \text { List-I (Type of colloid) } & & \text { List-II (Example) } \\ \hline \text { A } & \text { Sol } & \text { I } & \text { Cloud } \\ \hline \text { B } & \text { Foam } & \text { II } & \text { Whipped cream } \\ \hline \text { C } & \text { Gel } & \text { III } & \text { Paint } \\ \hline \text { D } & \text { Aerosol } & \text { IV } & \text { Butter } \\ \hline \end{array} $$

The correct answer is

Observe the following statements

Statement I : The choice of reducing agent for the reduction of an oxide ore can be predicted by using Ellingham diagram, a plot of $\Delta G^{\ominus}$ vs $T$.

Statement II : According to Ellingham diagram, metal oxide with higher $\Delta G^{\ominus}$ is more stable than the oxide with lower $\Delta G^{\ominus}$.

The correct answer is

Which one of the orders is correctly matched with the property mentioned against it?