Question

plzzzz answer plzzz plz plz please
plz answer the questions 19&20
the best answer I will mark BRAINLIEST
​

Answer 1

Answer:

1)Fe2O3. x H2O

2)CO2

Hope it helps...

Answer 2

Answer:

19. c

2o. a

Explanation:

Answer of 19: It is the formula of rust

20. It is due to CO2 gas.