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Q. An electrically charged atom or group of atoms is called
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Q. A gas which is not present in normal samples of air is
Q. “Atoms can neither be created nor destroyed.” This principle was given by __?
Q. The hottest part of the gas flame is known as the
Q. The amount of chlorine available in water after disinfection is called as
Q. Water for civil supplies is commonly purified by
Q. Heavy water is used as a coolant in nuclear reactors Heavy water is
Q. Choose the incorrect pair from the below.
Q. What is the electron configuration of Radium?
Q. Water is not effective in extinguishing a fire caused by petrol because
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