01.
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Amalgam is the alloy of ? Ans : Mercury |
02.
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Densest metal ? Ans : Osmium (22.59gm/cm3 at 20 Degree Centigrade) |
03.
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Densest Nonmetal ? Ans : Iodine |
04.
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Least Dense metal ? Ans : Lithium |
05.
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Least dense Nonmetal ? Ans : Hydrogen |
06.
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Which is used for Artificial Rain ? Ans : Silver Iodide |
07.
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Melting point of Gold ? Ans : 1063 Degree Centigrade |
08.
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Black twine is name given to ? Ans : Iron and Coal |
09.
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The gas used for artificial ripening of green fruit ? Ans : Acetylene |
10.
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Proton was discovered by ? Ans : Earnest Rutherford |
11.
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The element which kept under water ? Ans : White Phosphorus |
12.
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The element which kept kerosene ? Ans : Sodium, Potasium |
13.
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Chemical name of “Castaic Soda” ? Ans : Sodium Hydroxide |
14.
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Which acts as antiseptic in toothpaste ? Ans : Hydrogen Peroxide |
15.
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Which chemical is responsible for the aroma of perfumes ? Ans : Esters |
16.
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Which has the worst smell in the world ? Ans : Methylmercaptan |
17.
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Which has the highest melting point ? Ans : Tungsten |
18.
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Which has the lowest melting point ? Ans : Helium / -272 Degree Centigrade |
19.
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Which has the most corrosion resistant metal ? Ans : Iridium |
20.
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Rarest element in the earth crust ? Ans : Astatine |
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