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Chemistry

Chemistry
What is the mass percentage of oxygen in carbon dioxide (CO2)

0.509
0.727
0.658
0.305

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Chemistry
The lowest layer of earth's atmosphere is

Mesosphere
Stratosphere
Ionosphere
Troposphere

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Chemistry
In which of the following ions , the colour is not due to d-d transition ?

[Ti(H2O)6]3+
[Cu(NH3)4]2+
[CrO4]2−
[CoF6]3+

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Chemistry
Heavy metals got their name because compared to other atoms they have

Higher atomic masses
Higher atomic numbers
Higher densities
Higher atomic radii

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Chemistry
Which of the following elements is non-radioactive ?

Uranium
Thorium
Zirconium
Plutonium

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Chemistry
The atmospheric gas that is mainly responsible for Green House effect :

Oxygen
Ozone
Nitrogen
Carbondioxide

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MORE MCQ ON Chemistry

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