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. The chemical used as a fixer developer in photography
3. Diamond does not conduct electricity, because
4. Question 5.21:Describe some features of catalysis by zeolites.
5. Helium gas is used in gas balloons instead of hydrogen gas because it is
7. Basicity of boric acid, H3BO3 is
8. Which one of the following metals pollutes the air of a city having large number of automobiles?
9. The metal chiefly used for galvanising iron is
10. Which one of the following elements is least likely to be found in commercial fertilisers?