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The most abundant element in the earth crust is :
A
Oxygen
B
Nitrogen
C
Hydogen
D
Iron
Answer:
A. Oxygen
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The radioactive Gaseous element?
Which one of the following elements is used in the manufacture of fertilizers ?
The valency of nitrogen in NH3 is?
സാധാരണ ഹൈഡ്രജൻ എന്നറിയപ്പെടുന്ന ഹൈഡ്രജന്റെ ഐസോടോപ്പ് ?
The element which has highest melting point
