The equilibrium constant for the gas phase reaction

n2 (g) + o2 (g) ↔ 2no (g)

is keq = 4.20 × 10-31 at 30 °c. at equilibrium,

a only reactants are present

b roughly equal amounts of products and reactants are present

c reactants predominate

d only products are present

e products predominate

only reactants are present

If equllibrium constant is greater than 10^3 then product predominates

If equllibrium constant is greater than 10^ -3  then reactant predominates

in between 10^3 and 10^-3 the reaction is in equllibrium

and we see that the above value is 10^-31, it is  very  small so the answer is reactants are presents

answer; talc and gypsum;

they are all solids.