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Chemistry

Chemistry
Hardest allotrope of carbon is

Diamond
Coke
Lamp black
Graphite

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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
Which of the following is used in making smoke bombs?

Carbon
Sulphur
Phosphorus
Hydrogen

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Chemistry
The ore which is found in abundance in India is

monazite
bauxite
magnetite
fluorspar

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Chemistry
The inexpensive and commonly used variety of glass is called soda glass.

was initially used for storing sodium carbonate
was used initially for making bottles of soda(carbonated drink)
is made using soda lime
is made using soda(sodium carbonate)

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Chemistry
The two metal ions that cause hardness to water are:

Sodium, Magnesium
Calcium, Magnesium
Sodium, Calcium
Sodium, Potassium

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