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Chemistry

Chemistry
Higher concentration of nitrogen dioxide in atmosphere air causes

Corrosion
Cancer
Bronchitis
Asphyxiation

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Chemistry
The natural source of hydro-carbon is

Crude oil
Biomass
Coal
Carbohydrates

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Chemistry
Which of the following has least negative electron gain enthalpy

P
F
S
Cl

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Chemistry
In an oxygen molecule, two atoms are united by

Four bonds
Two bonds
One bond
Three bonds

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Chemistry
Peroxyacetyl nitrate is a

Plant hormone
Vitamin
Secondary pollutant
Acidic dye

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Chemistry
________ gives hardness to stainless steel.

Carbon
Lead
Zinc
Tin

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