The poisonous gas accidentally released in Bhopal Gas Tragedy is
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What is the percentage of methane in biogas?
Electrons in the highest energy level of an atom are called ________.
The element with the highest electron affinity among halogens is
The atoms of the elements having same difference between mass number and atomic number are called ______.
Carnotite is an ore/mineral of _____.
Who invented the modern periodic table?
Atomic number of which of the following elements is greater than that of Calcium?
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