6. In a schematic diagram for the preparation of hydrogen gas as shown in the figure. What would happen if the following changes are made a. taken in place of dilute sulphuric acid and the flask is In place of zinc granules, same amount of zinc dust is taken in the test tube?
b. Instead of dilute sulphuric, dilute hydrochloric acid is taken?
c. Sodium hydroxide is heated?
7. a. The blue colour of crystals of a substance on heating in a closed test tube gets changed but the colour was regained after sometime on cooling. Name that substance and write its chemical formula. Explain the phenomenon involved.
b. Write name and chemical formulae of two such compounds whose one unit is associated with 10 and 2 water molecules respectively. 3M
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