question_answer

Read the given passage and fill in the blanks by choosing an appropriate option. Iron nails when new are grey and bright. When exposed to ___(i)___, they get covered with a ___(ii)___ coating. This process is called ___(iii)___ and it is a ___(iv)___ change.

A)

(i)	(ii)	(iii)	(iv)
Moist air	Grey	Corrosion	Chemical, reversible

               

B)

(i)	(ii)	(iii)	(iv)
Air and water	Reddish brown	Rusting	Chemical, irreversible

               

C)

(i)	(ii)	(iii)	(iv)
Oxygen in air	Green	Rancidity	Physical, irreversible

               

D)

(i)	(ii)	(iii)	(iv)
Nitrogen in air	Reddish brown	Galvanisation	Chemical, irreversible