Red phosphorus is used in the manufacture of safety matches. This is due to the fact that
it shows phosphorescence
at ordinary temperature, it is less reactive than other varieties of phosphorus
it cannot be converted to white phosphorus on heating
it does not react with halogen on heating
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