$A$ man pushes a wall and fails to displace it. He does:

In the extraction of aluminium:
Process $X$: applied for red bauxite to remove iron oxide (chief impurity).
Process $Y$: (Serpeck's process) applied for white bauxite to remove $Z$ (chief impurity). Then,process $X$ and impurity $Z$ are:

Which one of the following is more readily hydrolysed by $S_{N}1$ mechanism?

For the reaction $CO_{(g)} + H_2O_{(g)} \rightleftharpoons CO_{2(g)} + H_{2(g)}$,at a given temperature,the equilibrium amount of $CO_{2(g)}$ can be increased by

Which of the following is a level of biological organization?

Which of the following reactions takes place in the Bessemer converter during the extraction of copper?