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Chemistry

Chemistry
Iron is extracted from

Bauxite
Dolomite
Cinnabar
Haematite

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Chemistry
Entropy of Universe is always

Increasing
Decreasing
Zero
Constant

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Chemistry
KMnO4 can be used as a/an

Insecticide
Pesticide
Fertiliser
Disinfectant

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Chemistry
Detergents clean surfaces on the principle of

Floatation
Elasticity
Surface tension
Viscosity

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Chemistry
Hard steel contains

0.1 to 0.4 per cent carbon
0.01 to 0.04 per cent carbon
0.5 to 1.5 per cent carbon
2 to 5 per cent carbon

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Chemistry
The method that cannot be used for removing permanent hardness of water is

adding caustic soda
distillation
boiling
adding sodium carbonate

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