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Chemistry

Chemistry
What is the second largest component in milk ?

Sugar
Fat
Water
Minerals

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Chemistry
The octane number of zero is assigned to

2-methyl octane
n-heptane
3-methyl octane
iso-octane

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Chemistry
When a metal is heated in a flame, the electrons absorb energy and jump to higher energy state. On coming back to the lower energy siate, they emit light, which we can observe in

Emission spectra
Absorption spectra
Raman spectra
Fluorescence

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Chemistry
The presence of ozone in the stratosphere is responsible for

Increasing the average global temperature in recent years
Checking the penetration of ultra-violet rays to the earth
Higher rate of photosynthesis
Supplying oxygen for people travelling in jets

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Chemistry
The addition of gypsum to portland cement helps in :

Rapid setting of cement
Reduction in the cost of cement
Increasing the strength of cement
Preventing rapid setting of cement

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Chemistry
Bleaching powder is prepared by passing :

Oxygen over slaked lime
Chlorine over slaked lime
Chlorine over quick lirne
Carbon dioxide over slaked lime

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MORE MCQ ON Chemistry

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