Magnesium ribbon is rubbed with sandpaper before burning because it has a coating of : (a) basic magnesium oxide. (b) basic magnesium carbonate
plz say which one is exactly correct....bcz some say that (a) is correct whereas some say (b).
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Flies need sticky feet to walk on ceilings, but not so sticky that they get stuck upside down. So each foot comes with a pair of claws that help hoist the gooey foot off the wall. Flies use several different techniques to get unstuck: pushing, twisting, and peeling its footpads free.12
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