If the concentration of reactants is increased by $x$ times,the equilibrium constant $K$ will become ................

Which statement for the equilibrium constant is true for the reaction $A + B \rightleftharpoons C$?

For the following reaction,
$C_{12}H_{22}O_{11(aq)} + H_2O_{(l)} \rightleftharpoons C_6H_{12}O_{6(aq)} + C_6H_{12}O_{6(aq)}$
Which of the following characteristics is not affected by the addition of a catalyst?

Addition of a catalyst in a system at equilibrium:

In the chemical reaction $A \rightleftharpoons B$,the system will be known to be in equilibrium when:

For the reaction ${H_2} + {I_2} \rightleftharpoons 2HI$ at $721 \ K$,the value of the equilibrium constant is $50$. If $0.5 \ mol$ of each of ${H_2}$ and ${I_2}$ are added to the system,the value of the equilibrium constant will be .............