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Chemistry

Chemistry
Which of the following is not a precious/semi-precious stone?

Ruby
Sapphire
Pearl
Emerald

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Chemistry
Persons working in cement plants and lime stone quarries are prone to disease like

Pneumoconiosis
Cancer
Silicosis
Asthma

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Chemistry
The temperature of oxy-acetylene flame is around

3200°C
2800°C
4000°C
3600°C

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Chemistry
Silicone is a polymer of

Silane
Tetraalkyl silane
Dialkyl dichloro silane
Silicon tetrachloride

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Chemistry
Emulsifier is an agent which

Aids the flocculation of emulsion
Homogenizes the emulsion
Accelerates the dispersion
Stabilizes an emulsion

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Chemistry
The deterioration of a metal by an electrochemical process is commonly termed as

Erosion
Corrosion
Passivation
Abrasion

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