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Chemistry

Chemistry
The alkaloid naturally found in coffee, cocoa and cola nut is

Morphine
Caffeine
Cocaine
Tannin

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Chemistry
Maximum permissible concentration of copper in drinking water in mg/L is

0.05
0.01
2
1

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Chemistry
The most abundant element is

Oxygen
Silicon
Nitrogen
Calcium

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Chemistry
The aqueous solution of potassium chloride is

A non-electrolyte
Initially weak and then become a strong electrolyte
A strong electrolyte
A weak electrolyte

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Chemistry
Air shows the property of

None of these
Both A and B
N2
O2

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Chemistry
Liquid Nitrogen boils at

97 Kelvin
54 kelvin
82 Kelvin
77 kelvin

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