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361
Study Of Museum Specimen Of Echinus and Cucumaria(Echinodermata) with Comments and Diagram
Comment Of Museum Specimen Of Echinus Distribution: Echinus is a genus of…
35. TO PERFORM SOME CHEMICAL REACTIONS AND TO REPRESENT THEM IN BALANCED CHEMICAL EQUATIONS.
1. The more electropositive metals displace less electropositive metals from their compounds…
34. TO SEPARATE A MIXTURE OF DYES IN INK OR UNIVERSAL INDICATOR BY PAPER CHROMATOGRAPHY AND TO DETERMINE THEIR Rf VALUES.
THEORY: Chromatography is a simple technique of separating micro-quantities of substances in…
33. TO SHOW THE PRESENCE OF OXYGEN IN AIR AND TO DETERMINE ITS PERCENTAGE BY VOLUME.
THEORY: Burning is one of the most familiar examples of chemical changes.…
32. TO SHOW THE PRESENCE OF CARBON DIOXIDE IN AIR.
THEORY: The presence of carbon dioxide in air can be shown by…
31. TO SHOW THE PRESENCE OF WATER VAPOUR IN AIR.
METHOD 1 THEORY: The presence of moisture or water vapour in air…
30. TO SEPARATE THE COMPONENTS OF A MIXTURE OF TWO INSOLUBLE SOLIDS. (ONE BEING SOLUBLE IN DIL ACID)
THEORY: Suppose the given mixture contains calcium carbonate and sand. Both are…
29. TO MIX THE TWO GIVEN SOLUTIONS, AND TO SEPARATE THE PRECIPITATE IN PURE AND DRY STATE
THEORY: Precipitation is a double decomposition reaction (also called metathesis) usually between…
28. TO SEPARATE A MIXTURE OF TWO SOLUBLE SOLIDS [SAY KNO3+ CU(NO3)2] BY FRACTIONAL CRYSTALLIZATION.
THEORY: Fractional crystallization is a fairly successful method of separating the components…