Chemistry

Optimum pH range for the enzymatic activity is

The shape of molecule when the central atom contains 3 bond pairs and 2 lone pairs is

If $pH$ of saturated solution of $Ca{\left(OH\right)}_2$ is 12 then $K_{sp}$ of $Ca{\left(OH\right)}_2$  is

For the reaction, $2Cl\left(g\right)-?C{l}_2\left(g\right)$ , the sign of $?H$ and $?S$  respectively are

Hydrolith on treatment with water gives

Statement – I : Ellingham diagram explains the kinetics of reduction process.

Statement – II : Hydraulic washing, a method of concentration of ore is based on the differences in gravities of the ore and the gangue.

In the light of above statements choose the correct option among the following.

Volume of $C{O}_2$ obtained at STP on heating $100g$ of $CaC{O}_3$ sample $\left(25\%purity\right)$  is

The phenomenon of producing electrical signals in a crystal by applying pressure is known as

Statement – I : hcp and ccp structure are equally efficient.

Statement – II : Same number of atoms are present in a hcp and ccp unit cell.

In the light of above statement choose the correct option among the following.

The $E_{cell}^0$  for the cell reaction

$Cr+F{e}^{2+}\to C{r}^{3+}+Fe$ , will be (Given: $?G^0=-170kJmo{l}^{-1})$