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Chemistry

Chemistry
The length of double bond is _______ than single bond

Shorter
Of same lenght
Longer
None of these

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Chemistry
Conduction band electrons have more mobility than holes because they

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

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Chemistry
Ozone depletion in the stratosphere is mainly caused by

NO
SO2
NO2
Chlorogluorocarbons

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Chemistry
The green colour seen in firework displays is due to the chloride salt of :

Barium
Calcium
Strontium
Sodium

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Chemistry
The mass of P4O10 that will be obtained from the reaction of 1.33 gram of P4 and 5.07 of oxygen is

3.05 gram
2.05 gram
4.05 gram
5.05 gram

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Chemistry
The important metal used with iron to produce stainless steel is

Carbon
Tin
Chromium
Aluminium

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