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Chemistry

Chemistry
Which one of the following elements is used in the manufacture of safety matches?

Graphite
Phosphorus
Sodium
Silicon

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Chemistry
Which one is the most reactive halogen

Iodine
Fluorine
Chlorine
Bromine

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Chemistry
Photo-oxidation process is initiated by

Oxygen
Catalyst
Heat
Light

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Chemistry
Which one of the following nonmetals shows allotropy in the liquid state?

Bromine
Phosphorous
Sulphur
Carbon

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Chemistry
The function of skimming tank in sewage treatment is to remove

Suspended solids
Oil and fatty substances
Inorganic substances
Gritty substances

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Chemistry
Rectified spirit is :

Tincture iodine
95% ethyl alcohol
Methylated spirit
100% ethyl alcohol

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