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Chemistry

Chemistry
Which of the following is a natural dye ?

Crystal violet
Alizarin
Aniline blue
Phenolphthalein

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Chemistry
Threshold limit value of copper in the atmospheric air is

0.001 mg/m3
1.0 mg/m3
5.0 mg/m3
0.01 mg/m3

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Chemistry
Conduction band electrons have more mobility than holes because they

Have negative charge
Need less energy to move them
Experience collision less frequently
Are lighter

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Chemistry
What are the major pollutants of cigarette smoke?

Carbon monoxide and benzene
Carbon monoxide and nicotine
Dioxin and benzene
Carbon monoxide and dioxin

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Chemistry
When conc. H2SO4 is added to dry KNO3, brown fumes are evolved. These fumes are due to

NO2
N2O
SO3
SO2

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Chemistry
Aspirin is common name of

Acetyl Salicylic Acid
Salicylic Acid
Methyl Salicylate
Salicylate

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