7th Class
Science
Physical and Chemical Changes
Question Bank
Physical and Chemical Changes
question_answer
DIRECTIONS: On the basis of following diagram/picture answer the questions given below: In an experiment a painted iron nail was placed into a beaker containing sea water (Fig 'A'). The beaker was left undisturbed for about 10 days. After 10 days, the nail began to rust (Fig 'B') which of the following statements is/are correct? (i) Poor quality paint was used to paint iron nail. (ii) Oxygen and water cause rusting. (iii) Presence of salts in sea water enables rust formation faster.