Which one of the following reactions is classified as a single replacement reaction?

An experimental procedure requires a 10 ml of acid to be dissolved

Classify this reaction: 2al+n2-> aln.

Consider the reaction: n2(g) + o2(g) ⇄ 2no(g) kc = 0.10 at 2000oc starting with initial concentrations of 0.040 mol/l of n2 and 0.040 mol/l of o2, calculate the equilibrium concentration of no in mol/l how would this be done?