Which of the following is not a greenhouse gas?
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Acid Rain has pH value of
What is the full form of PVC?
Which of the following gases is liberated when Sodium Hydrogen Carbonate is heated?
Non-metal oxides are usually
Which of the following is NOT a property of acids?
There are 15 protons and 22 neutrons in the nucleus of an element. What is its mass number?
Which of the following metals is found in free state?