Which one of the following statements about the law of conservation of mass is correct?
A given compound always contains exactly same proportion of elements.
When gases combine in a reaction, they do so in a simple ratio by volume, provided all gases are at room temperature.
Matter can neither be created nor destroyed.
Equal volumes of all gases at same temperature and pressure contain equal number of molecules.
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