An inert gas mixed with oxygen given to patients suffering from restricted breathing is
1). Helium
2). Krypton
3). Radon
4). Argon
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2. Which of the following metals causes ItaiItal disease ?
4. When water itself combines chemically with some element or mineral it is called
5. Ultraviolet rays can be used in water treatment as
6. Which one of the following minerals is found in pure form
7. Atomic number of which of the following elements is greater than that of Copper?
8. The water pollution in river is measured by the dissolved amount of