Give reasons : Sodium, potassium and lithium are stored under oil.
Give reasons why copper is used to make hot water tanks and not steel (an alloy of iron).
Which metals do not corrode easily ?
What type of oxides are formed when non-metals combine with oxygen?
A man went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was upset but after a futile argument the man beat a hasty retreat. Can you play the detective to find out the nature of the solution he had used?