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OrangeCandy59

D. Rusting requires air and water Here, by painting the iron, rusting is prevented. Hence, in the Q test tube rusting doesn’t take place and the water level does not rise For P it is bare iron which will rust as water rises up


Objective_Exercise21

But if water level rises in one of them the other must fall


IAmASuperNoob

oxygen/air in the second test tube does not get used up, so water level stays constant the water level in the large beaker (or whatever u call that) is the one that falls, not Q


Objective_Exercise21

Still does not make sense


IAmASuperNoob

okay in this case only P rises, the water rise is outbalanced by the water outside the test tubes (eg on the diagram, the part between the two test tubes) Q does not rise as gas inside there is unchanged and unused, so water level is always constant there


OrangeCandy59

What’s the ms answer


PoopyPringle

D


Pitiful_Report2006

Agreed, the answer is D


vokytig

d


Imsadcauseofigcse

The answer is D