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CHEMISTRY

Chemistry
In addition to hydrogen, the other abundant element present on Sun’s surface is

Helium
Oxygen
Argon
Neon

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

Carbon
Nitrogen
Hydrogen
Oxygen

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Chemistry
What is the element required for solar energy conversion ?

Silicon
Ultra pure carbon
Tantalum
Beryllium

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Chemistry
Major portion of the earth’s crust is mainly constituted by

Oxygen and Iron
Silicon and Iron
Silicon and Aluminium
Oxygen and Silicon

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Chemistry
In surgery, metal pins are used for joining together broken bones. These metal pins remain uncorroded in the body. What is the material of these pins?

Titanium
Copper
Iron
Aluminium

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