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Chemistry

Chemistry
Who modified Bohr's theory by introducing elliptical orbits for electron path

Sommerfeld
Thomson
Rutherford
Hund

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Chemistry
What is the principal ore of aluminium ?

Dolomite
Lignite
Copper
Bauxite

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Chemistry
Silver nitrate solution is kept in brown bottles in laboratory because

Brown bottles react with it
Brown bottles do not react with it
Brown bottles stops the passage of light through it
It reacts with ordinary white bottles

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

Tannin
Caffeine
Morphine
Cocaine

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Chemistry
Which of the following elements is obtained from sea weeds ?

Sulphur
Argon
Iodine
Vanadium

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Chemistry
Air is said to be saturated when :

Its thickness is maximum
It blows over the barren land
Its pressure is minimum
It contains maximum content of water vapour

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