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Chemistry

Chemistry
Which of the following is not a noble gas ?

Hydrogen
Helium
Neon
Argon

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Chemistry
Milk tastes sour when it is left in open for some time. This happens due to the formation of

Citric acid
Acetic acid
Lactic acid
Carbonic acid

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Chemistry
By which organic compound all the oils are known ?

Ester
Carbohydrate
Hydrocarbon
Protein

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Chemistry
Higher concentration of nitrogen dioxide in atmosphere air causes

Corrosion
Bronchitis
Asphyxiation
Cancer

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Chemistry
Among the following, carbonate ore of Zinc is

Sphalerite
Zincblende
Zincite
Calamine

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Chemistry
Stains of rust on clothes can be removed by :

Oxalic acid
H2O2
Petrol
Alcohol

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