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For ${N_2} + 3{H_2}$ $\rightleftharpoons$ $2N{H_3}$ equilibrium constant is $k$ then equilibrium constant for $2N_2 + 6H_2 $ $\rightleftharpoons$ $ 4NH_3$ is

• A
  $\sqrt k $
• ✓
  ${k^2}$
• C
  $k/2$
• D
  $\sqrt {k\; + \;1} $