4. Chemical bonding and molecular structure — Chemistry STD 11 Science — Question

$2 SO _2( g )+ O _2( g ) \rightleftharpoons 2 SO _3( g ), \Delta H =-190\,kJ$

The number of factors which will increase the yield of $SO _3$ at equilibrium from the following is $.............$.

$A.$ Increasing temperature

$B.$ Increasing pressure

$C.$ Adding more $SO _2$

$D.$ Adding more $O _2$

$E.$ Addition of catalyst

$2CrO_4^{2 - } + 2{H^ + } \to C{r_2}O_7^{2 - } + {H_2}O$

$C_{(graphite)} + CO_{2(g)} \rightarrow 2CO _{(g)}$

are $170\, kJ$ and $170\, J K^{-1},$ respectively. This reaction will be spontaneous at ............ $\mathrm{K}$