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

$Fe(OH)_{3(s)} \rightleftharpoons  Fe^{3+}_{(aq)} + 3OH^-_{(aq)}$

is decreased by $1/4$ times, then equilibrium concentration of $Fe^{3+}$ will increase by.....$ times$

$A_{2(g)} + B_{2(g)} \rightleftharpoons  2AB_{(g)}$

At equilibrium, the concentration of $A_2= 3.0 \times 10^{-3} \, M,$ of $B_2= 4.2 \times 10^{-3} \, M,$ of $AB= 2.8 \times 10^{-3} \, M,$

If the reaction takes place in a sealed vessel at $527^o C,$ then the value of $K_c$ will be

If $T _2> T _1$, the correct statement(s) is (are)

(Assume $\Delta H ^{\ominus}$ and $\Delta S ^{\ominus}$ are independent of temperature and ratio of $\ln K$ at $T _1$ to $\ln K$ at $T_2$ is greater than $T_2 / T_1$. Here $H, S, G$ and $K$ are enthalpy, entropy, Gibbs energy and equillibrium constant, respectively.)

$(A)$ $\Delta H ^{\ominus}<0, \Delta S ^{\ominus}<0$  $(B)$ $\Delta G ^{\ominus}<0, \Delta H ^{\ominus}>0$  $(C)$ $\Delta G ^{\ominus}<0, \Delta S ^{\ominus}<0$  $(D)$ $\Delta G ^{\ominus}<0, \Delta S ^{\ominus}>0$