শূণ্যস্থান পূরণ করোঃ (i) [ _ phantom 0 ^ phantom 0 X + _ 7 ^ 14 N = _ 8 ^ 17 O + _ 1 ^ 1 H ] (ii) ( N_ 2 , (g) + 2 H_ 2 , (g) underset 200 , atm , pressure stackrel underline hspace 3cm longrightarrow 2 NH_ 3 + underline hspace 0.8cm , mathrm KJ , mol^ -1 , (at , 450^ circ - 550^ circ , C, , with Fe catalyst) ) (iii) ( Sn^ ++++ + 2 e^ - rightarrow underline hspace 0.5cm ) (iv) 32 gms of ( O_ 2 ) contain ( underline hspace 2cm ) molecules of oxygen. (v) Equivalent ( w )t-g acid ( = frac underline underline hspace 6cm )