Question
Which is the lightest and most abundant chemical
element, constituting roughly 75 % of the Universeās elemental mass?Solution
The lightest and most abundant chemical element in the Universe is hydrogen. It constitutes about 75% of the elemental mass in the Universe. Hydrogen is also the first element in the periodic table, with the atomic number 1. It is a highly reactive element, and it can form a wide variety of compounds with other elements.
What is the permissible concentration of residualĀ chlorine present in drinking water in mg/L?
The (O-H) bond in CH3OH is which type of bond?
Bleaching powder is represented as ______.
What is the equilibrium distance for Hydrogen atoms?
Which of the following statement is/are true?
I. Metal oxides are acidic in nature
II. Non-metallic oxides are basic in nature
Law of conservation of mass is not correct for
A mixture of carbon monoxide and hydrogen is known as ______
Water from soil enters into the root hairs owing to :
Which of the following metals forms an amphoteric oxide?
Which of the following is a synthetic polymer?
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