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Chemistry

Chemistry
The most pure form of Carbon among the options is

Wood Charcoal
Graphite
Lampblack
Anthracite

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Chemistry
The main active constituent of tea and coffee is

chlorophyll
aspirin
nicotine
caffeine

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Chemistry
The method that cannot be used for removing permanent hardness of water is

boiling
adding sodium carbonate
distillation
adding caustic soda

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Chemistry
Which among the following elements is found in maximum percentage in the human body ?

Hydrogen
Oxyzen
Nitrozen
Carbon

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Chemistry
Methanoic and ethanoic acids can be distinguished by the action of

NaHCO3
NaOH
Tollen's reagent
SOCl2

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Chemistry
Conduction band electrons have more mobility than holes because they

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

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