Question

please??????????,,,,

Answer 1

a)in test tube 2 the air can't get to the iron nail because of the oil coating so the iron will not Rust

b)in testtube one iron is in contact with both air and water show iron nail gets rusted

c)the iron nail will not get rusted it in the test tube 3 because the calcium carbonate present in the test tube has the ability to observe the moisture present in the test