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Chemistry

Chemistry
DDT and BHC may act as

None of these
Allergens
Carcinogens
Asthematic agents

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Chemistry
The percentage of oxygen in air is approximately

0.21
0.01
1
0.78

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Chemistry
The process of covering water pipes made of Iron with Zinc layer to prevent corrosion is called :

Zinc plating
Vulcanization
Alloy formation
Galvanization

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Chemistry
What is the element that is in the highest percentage in the composition of the earth ?

Magnesium
Oxygen
Silicon
Iron

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Chemistry
Which among the following is liquid non-metal ?

Bromine
Alcohol
Mercury
Water

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Chemistry
Dry powder fire extinguishers contain

Sand and sodium carbonate
Sand and sodium bicarbonate
Sand
Sand and potassium carbonate

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