2NO(g)+Cl₂(g)⇔2NOCl,the equilibrium constant of the reaction is1)k

1.	2NO(g)+Cl₂(g)⇔2NOCl,the equilibrium constant of the reaction is1)kc=[NOCl]²/[NO]²[Cl₂]²,2) kc=[NOCl]²/[2NO]²[Cl²],3) kc=[NOCl]²/[NO]²[CL²],4) [2NOCl]/[2NO][Cl].
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2NO(g)+Cl₂(g)⇔2NOCl,the equilibrium constant of the reaction is1)kc=[NOCl]²/[NO]²[Cl₂]²,2) kc=[NOCl]²/[2NO]²[Cl²],3) kc=[NOCl]²/[NO]²[CL²],4) [2NOCl]/[2NO][Cl].

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what is this ????????????