Q.3
(g) Fig. 3 is an illustration of a setup used to produce gas in the laboratory:
Name each of the parts labelled I, II, III, IV, and V:
I: Flask – Contains the reaction mixture (Acid + Calcium carbonate).
II: Delivery tube – Allows the gas produced from the reaction to be transferred.
III: Thistle funnel – Used to add the acid to the flask.
IV: Delivery tube – Transfers the gas to the next apparatus or container.
V: Gas jar – Collects the gas being produced in the reaction.

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3a
Answer:
(i) It is necessary to moisten a piece of litmus paper in testing for the acidity and alkalinity of a gas to observe color changes indicating the nature of the gas.
(ii) Acidifying the test solution with dilute hydrochloric acid in the confirmatory test for SO2 helps in confirming the presence of sulfur dioxide by facilitating the necessary chemical reactions.

3b


Answer:
(i) Two gases that must not be prepared in the open laboratory are chlorine gas and hydrogen sulfide gas.
(ii) To prevent excessive inhalation of these gases during their preparation, one precaution is to carry out the preparation of these gases in a fume hood or a well-ventilated area to ensure that any released gas is safely removed from the laboratory atmosphere.
(iii)
(a) A wash bottle is used in the laboratory to dispense small quantities of distilled water or other liquids for rinsing or washing purposes.
(b) A tripod stand is commonly used in the laboratory to support apparatus such as beakers, flasks, or crucibles during heating over a Bunsen burner.

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