Which one of the following reactions does not result in the evolution of hydrogen gas?
Reaction of zinc metal with dilute sulphuric acid solution
Mixing water to Plaster of Paris
Heating zinc metal with sodium hydroxide solution
Reaction of potassium metal with water
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