Exercise X — task. Science CBSE, Class 8.

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1. Can the process of rusting be called combustion? Discuss.

The process of rusting releases heat during the formation of its oxide. So, we can called it as slow combustion.
The process of rusting absorb heat during the formation of its oxide. So, we cannot called it as combustion.
The process of rusting releases more amount of heat during the formation of its oxide. So, we can called it as rapid combustion

2. Abida and Ramesh were doing an experiment in which water was to be heated in a beaker. Abida kept the beaker near the wick in the yellow part of the candle flame. Ramesh kept the beaker in the outermost part of the flame. Whose water will get heated in a shorter time?

Abida's water will get heated in a short time. Because yellow part of the flame is the hottest part.
Abida's water will get heated in a long time. Because yellow part of the flame is the hottest part.
Ramesh's water will get heated in a short time. Because outermost part of the flame is the hottest part.

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