Q43Multiple choice
In the following schematic diagram for the preparation of hydrogen gas as shown in Figure 2.3, what would happen if following changes are made? Delivery tube Stand Burning of hydrogen gas with a pop sound Candle Test tube Hydrogen Dilute gas sulphuric bubbles acid Soap bubble filled Zinc granules with hydrogen Soap solution Fig. 2.3 16 E XEMPLAR P ROBLEMS – SCIENCE
This question refers to a figure in the original PDF.
- (a)In place of zinc granules, same amount of zinc dust is taken in the test tube
- (b)Instead of dilute sulphuric acid, dilute hydrochloric acid is taken
- (c)In place of zinc, copper turnings are taken
- (d)Sodium hydroxide is taken in place of dilute sulphuric acid and the tube is heated.
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Hint— (a) Hydrogen gas will evolve with greater speed (b) Almost same amount of gas is evloved (c) Hydrogen gas is not evolved (d) If sodium hydroxide is taken, hydrogen gas will be evolved Zn + 2NaOH o Na2ZnO2 + H2 Sodium zincate