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Chemistry

Chemistry
Which one is the most reactive gaseous element

Chlorine
Iodine
Bromine
Flourine

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Chemistry
The main buffer system of the human blood is

NH2CONH2 - NH2CONH+
H2CO3 - HCO3
CH3COOH - CH3COO-
H2CO3 - CO32-

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Chemistry
Persons working in cement plants and lime stone quarries are prone to disease like

Asthma
Cancer
Pneumoconiosis
Silicosis

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Chemistry
The main active constituent of tea and coffee is

nicotine
caffeine
chlorophyll
aspirin

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Chemistry
A substance which readily forms colloidal solution in contact with water is called

Hydrophobic colloid
Hydrophilic colloid
Extrinsic colloid
Associated colloid

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Chemistry
Which of the following chemicals is responsible for depletion of ozone layer in the atmosphere?

Sulphur dioxide
Chlorofluorocarbons
Nitrous oxide
Carbon dioxide

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