Which one among the following statements for the gases mentioned below is not correct ?
Hydrogen has 3 isotopes.
Helium is a commonly used gas in electric bulbs.
Oxygen is used to burn fuel in rocket engines in spacecraft.
Nitrogen can be used in gaseous form to replace air in food packaging.
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