Which are the two regions of the earth with extremely hot and extremely cold climatic conditions?

Answer

A

Explanation

Hint: `2 NH_3 (g) to N_2 (g)+3H_2 (g)`
Rate =k (as zero order reaction so independent of concentration of reactants)
`2.5 xx 10^(-4) = -1//2 d [NH_5]//dt =+ d [N_2]//dt = +1//3 d [H_2]//dt`
`= 2.5 xx 10^(-4) xx 3 = 7.5 xx 10^(-4)`