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Chemistry

Chemistry
The gas dissolved in water that makes it basic is :

Ammonia
Sulphur dioxide
Carbon dioxide
Hydrogen

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Chemistry
The most abundant element by number in the living system is :

Carbon
Oxygen
Nitrogen
Hydrogen

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Chemistry
Colour imparted to the Bunsen flame by strontium salt is

Bluish green
Brick red
Apple-green
Crimson red

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Chemistry
It is dangerous to leave the car engine running in a closed garage, because it may cause serious pollution due to poisoning by emission of

Unburnt petrol
CO2
CO
SO2

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Chemistry
The molecule which has the highest percentage of ionic character among the following is

HI
HBr
HCI
HF

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Chemistry
What are the number of moles of CO2 which contains 16 g of oxygen?

0.25 mole
0.2 mole
0.5 mole
0.4 mole

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