Lightest and most abundant chemical element, constituting roughly 75 % of the Universe‘s elemental mass.

Related MCQs

• Which of the following is / are correct statements with respect to Copper (Cu), Silver (Ag) and Gold (Au)? 1. All of them are can be found naturally in their elemental state 2. All of them belong to same group in the periodic table Select the correct option from the codes given below:
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• Which among the following kinds of Chemical reactions cause the rocks turn red or yellowish?
• The chemical oxygen demand COD test is commonly used to measure which of the following?
• Which among the following will undergo a chemical reaction depending on the pH of the solution?