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In the following schematic diagram form ...

In the following schematic diagram form the preapratinn of hydrogen gas as shown in the figure what would happen if the following chnges are made? ltbvrgt
(a) In plae of zinc granules , same amount of zinc dust is taken in the test tube
(b) Instead of dilute suplhuric acid , dilute hydrochloric acid is taken.
(c ) In place of zinc, copper turnings are taken
(d) Sodium hydroxide is taken in place of dilute suphuric acid and the tube is heated.

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