Question

a.Hydrogen is the lightest element known. It is used as a rocket fuel in its liquid form. Hydrogen can

also be prepared in the laboratory. [ 5 ]

i. Name the reactants required.

ii. Name the Solid reactant that is preferred.

iii. Identify the impurity present in the solid reactant preferred.

iv. State the function of the impurity present.

v. Name the method of collection.

vi. Reason for using the above method of collection.

vii. State a test to identify hydrogen gas.

viii. Write the precautions that has to be followed.

ix. Write balanced chemical equation for the reaction.

x. Name the neutral oxide formed when hydrogen burns in oxygen.​

Answer 1

Procedure for the Laboratory Preparation of Hydrogen Gas

Step 1: Take a few grams of zinc granules and place them in a 500 mL flask.

Step 2: With the help of a thistle funnel, add dilute hydrochloric acid to the zinc granules. If hydrochloric acid isn’t available, dilute sulphuric acid can be used as an alternative.

Step 3: Hydrogen gas will be automatically collected with the help of a delivery tube via the downward displacement of water. This can be explained by the fact that hydrogen gas is lighter than water.

The setup for the laboratory preparation of hydrogen gas is illustrated below.

Laboratory Preparation of Hydrogen Gas

The chemical reactions that take place during the preparation of hydrogen gas via this method are listed below.

General Format: Metal + Dilute Acid → Salt of Metal & Acid + Hydrogen

With Hydrochloric Acid: Zn + 2HCl → ZnCl2 + H2

With Sulphuric Acid: Zn + H2SO4 → ZnSO4 + H2

Finally, the hydrogen gas can be collected by the downward displacement of water.

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