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Chemistry

Chemistry
Percentage of lead in lead pencils is

31-66
40
80

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Chemistry
Which of the following gases will effuse out of football bladder most quickly ?

H2
O2
N 2
He

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Chemistry
The chemical name of 'Hypo' commonly used in photography is

Sodium thiosulphate
Silver nitrate
Sodium nitrate
Silver iodide

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Chemistry
Which one of the following does not form oxyacid ?

Fluorine
Chlorine
Nitrogen
Sulphur

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Chemistry
The oil used in the froth floatation process is

olive oil
pine oil
kerosene oil
coconut oil

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Chemistry
Iron and manganese present as pollutants in water cannot be removed by________

Oxidation followed by settling and filtration
Chlorination
Ion exchange process
Lime soda process or manganese zeolite process

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