___ is not a chemical change.
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What charge is present on a neutron?
What is the valency of magnesium?
Which of the following solutions is the most acidic among them all?
____ is the process in which acids and bases react to form salts and water.
An element has an atomic weight of W and an atomic number of N. The number of protons in the nucleus of its atom is
What is the number of atoms constituting a molecule known as?
Which of the following type of medicine is used to treat indigestion?