Which one of the following is not an example of an oxidation reaction?
The taste of butter changes if left for a longer period
A white substance is formed when an aqueous solution of barium chloride is mixed with sodium sulphate solution
A reddish-brown powder gets coated on articles made of iron
Wine gets sour with time
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