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Chemistry

Chemistry
Which one of the following is known as the 'brown coal'?

Bituminous
Coke
Anthracite
Lignite

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Chemistry
Electrolysis of an aqueous solution of copper sulphate using copper electrodes gives

Copper at anode and oxygen at cathode.
Copper at cathode and oxygen at anode
Hydrogen at cathode and oxygen at anode
Copper at cathode and anodes dissolve to give copper

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Chemistry
Silicon is used in

Solar energy devices
Transistors
Semiconductors
All of these

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Chemistry
Alum stops bleeding in minor cuts because of

Emulsion
Coagulation
Dialysis
Solvation

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Chemistry
The number of waves in n x 10th Bohr's orbit are

n
n3
n2
n-2

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Chemistry
Nitrogen forms a variety of compounds in all oxidation states ranging from

–3 to + 4
–3 to + 6
–3 to + 5
–3 to + 3

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