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Chemistry

Chemistry
Entropy of Universe is always

Constant
Increasing
Zero
Decreasing

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Chemistry
The compound that has the least value for octane number is :

2,2-dimethyl hexane
2-methyl heptane
N-heptane
Iso-octane

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Chemistry
The most abundant constituent of atmospheric air is :

Hydrogen
Oxygen
Nitrogen
Carbon

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Chemistry
Which of the following is colourless ?

Sulphur
Oxygen
Phosphorus
Chlorine

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Chemistry
What is the atomic number of mercury

80
32
41
63

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

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

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