Chemical equilibrium is dynamic in nature because

In which of the following cases does the reaction go farthest to completion?

For the reaction $2HI_{(g)} \rightleftharpoons H_{2(g)} + I_{2(g)}$,the equilibrium constant $K$ at room temperature is $2.85$,and at $698 \ K$ it is $1.4 \times 10^{-2}$. This indicates that:

Given the reactions at $500 \ K$:
$(i) \ H_{2(g)} + 1/2 O_{2(g)} \rightleftharpoons H_2O_{(g)}$,$K_c = 2.4 \times 10^{47}$
$(ii) \ H_2O_{(g)} \rightleftharpoons H_{2(g)} + 1/2 O_{2(g)}$,$K_c = 4.1 \times 10^{-48}$
What does the magnitude of $K_c$ indicate about the formation of the product in reaction $(i)$?

$A$ reversible reaction involving two reactants is at equilibrium. If the concentration of the reactants is doubled,the equilibrium constant will ......

For a reversible reaction,if the concentration of the reactants is reduced to half,the equilibrium constant will be.........