Which of the following group is NOT Dobereiner Triads?
Among chemical properties, Mendeleev concentrated on the compounds formed by the elements with
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Which was not produced by volcanic outgassing?
According to an early Indian philosopher everything is made up of ___ basic elements.
Which of the following is an amphoteric oxide?
Tooth decay starts when the pH of the mouth is lower than
What happens as we go down the group in the periodic table?
In the process of ___, the iron is protected by a coating of zinc.
Which of the following is NOT a property of acids?