Chemistry
Combustion of a candle is a/an

Physical change
Photochemical reaction
Endothermic reaction
Exothermic reaction

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Chemistry
Water is not effective in extinguishing a fire caused by petrol because

Water and petrol react chemically
Water and petrol are miscible with each other
The flame is too hot for water to cool it down
Water and petrol are immiscible with each other and petrol which forms the upper layer continues to burn

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Chemistry
Aqua regia is a 1 : 3 mixture, by volume, of

Conc. hydrochloric acid and conc. nitric acid
Conc. nitric acid and conc. sulphuric acid
Conc. nitric acid and conc. hydrochloric acid
Conc. sulphuric acid and conc. nitric acid

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