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Chemistry

Chemistry
Lead pencil contains

Lead sulphide
Lead
Graphite
Ferrous sulphide

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Chemistry
The gas used for artificial ripening of green fruit is

ethane
acetylene
carbon dioxide
ethylene

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Chemistry
Sulphur dioxide bleaches colouring matter by :

Reduction
Decomposition
Oxidation
Dehydration

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Chemistry
The gas used to extinguish fire is

Neon
Carbon dioxide
Nitrogen
Carbon monoxide

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Chemistry
If water smells bad, then that odour can be removed by adding

Bleach
Deactivated nitrogen
Activated carbon
Alum

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Chemistry
Which one of the following is used as a sowing agent in the preparation of soft drinks?

Phosphorus acid
Phosphoric acid
Boric acid
Salicylic acid

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