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Chemistry

Chemistry
Which of the following gases is most toxic ?

Carbon monoxide
Sulphur dioxide
Carbon dioxide
Chlorine

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Chemistry
Which one of the following species has the highest bond order, shortest bond length and maximum bond strength

O-2
O+2
O-22
O2

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Chemistry
Which among the following is liquid non-metal ?

Water
Bromine
Mercury
Alcohol

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Chemistry
When lime juice is dropped on baking soda, brisk effervescence takes place because the gas evolved is

Hydrogen
Oxygen
Carbon dioxide
All of them

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Chemistry
A balloon filled with helium rises in air because

Air exerts an upward force on the balloon
Helium pushes down on the air below the balloon
Helium is less dense than air
The balloon is weightless

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Chemistry
Iron and manganese present as pollutants in water cannot be removed by________

Ion exchange process
Chlorination
Lime soda process or manganese zeolite process
Oxidation followed by settling and filtration

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