Is my answer for c) correct???

it's wrong

the correct equation is :

2NaOH + BaS -> Na2S + Ba(OH)2

iron and sleel

make siroeel

the major pests we deal with are insects, weeds and fungal diseases. a pesticide is a product, whether organic or chemical, used to kill the target pest. there are other techniques gardeners should use that can prevent the severe infestations that make the use of pesticides necessary