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Chemistry

Chemistry
Ruby and sapphire are oxides of

Copper
Iron
Aluminium
Tin

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Chemistry
The chemical used for cloud seeding for artificial rains is

Silver Nitrate
Silver Iodide
Potassium Bromide
Potassium Nitrate

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Chemistry
Which of the following gases is mixed with oxygen for breathing by divers in aqua lungs?

Hydrogen
Methane
Nitrogen
Helium

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Chemistry
The rusting of iron is a/an

Physical change
Electrochemical change
None of these
Electrical change

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Chemistry
Cement containing excess amount of lime

Is slow setting
Becomes more strong
Cracks during setting
Is quick setting

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Chemistry
Which of the following is used for refrigeration?

Freon
Sulphur dioxide
Chlorine
Phosphine

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