Silver articles become black after some time when exposed to air because
silver gets oxidized to silver oxide
silver reacts with moist carbon dioxide in the air to form silver carbonate
silver reacts with sulphur in the air to form a coating of silver sulphide
silver reacts with nitrogen oxides in the air to form silver nitrate
For election to the Lok Sabha, a nomination paper can be filed by
Miscellaneous · Easy
In a month if the seventh day is three days earlier than Saturday,then the nineteenth day of the month will be a
Miscellaneous · Easy
Which among the following events happened earliest ?
Miscellaneous · Easy
An 80-litre solution of alcohol and water has 75% alcohol. How much water (in litres) must be added to bring down the concentration of alcohol to 60%?
Miscellaneous · Easy