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Chemistry

Chemistry
'Plaster of Paris' is made by partial dehydration of

Gypsum salt
Blue vitriol
Green vitriol
Epsom salt

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Chemistry
In arc welding, Argon is used because of its

Ability to lower the melting point of the metal
Low reactivity with metal
High flammability
High calorific value

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Chemistry
The presence of ozone in the stratosphere is responsible for

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

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Chemistry
Which among the following elements is found in maximum percentage in the human body ?

Carbon
Hydrogen
Oxyzen
Nitrozen

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Chemistry
Periodic table contains how many periods

8
6
10
7

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Chemistry
Exposure to mixtures of chemicals are greater than expected on the basis of effects of exposure to each chemical individually. This is known as

Independent
Synergism
Antagonism
Additives

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MORE MCQ ON Chemistry

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