Which one of the following is a reduction reaction?
2 Mg (s) + O₂ (g) → 2 MgO (s)
S (s) + O₂ (g) → SO₂ (g)
2 HgO (s) —heat→ 2 Hg (l) + O₂ (g)
Mg (s) + S (s) → MgS (s)
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