The diagram below represents an experiment to show the presence of a component of air – State why air is sucked from - outlet 'B' and not from outlet 'A'.

Air is sucked from - outlet 'B' and not from outlet 'A', because if we suck from ‘A’, lime water will be sucked out. As outlet 'A' is completely dipped inside the lime water. Limewater is the common name for a saturated aqueous solution of calcium hydroxide.

The diagram below represents an experiment to show the presence of a component of air – State why the air is sucked 'slowly' from - the outlet 'B'.

Air is sucked slowly from outlet 'B' because if the air is sucked fast, lime water will also be sucked out. Air contains carbon dioxide and if it is bubbled through limewater, the limewater turns milky or cloudy white.

The diagram below represents an experiment to show the presence of a component of air – State the observation seen after completion of the experiment.

The observation seen after the completion of the experiment is the limewater turns milky or cloudy white. As the air contains carbon dioxide and if it is bubbled through limewater, it will turn milky.

The diagram below represents an experiment to show the presence of a component of air – State the reason for observation seen after completion of the experiment.

When CO 2 passes through lime water, it turns into milky. The reason for the milky or cloudy appearance is the formation of insoluble calcium carbonate. The chemical reaction is as follows: Ca ( OH ) 2 aq + CO 2 g → CaCO 3 s + H 2 O l .

The diagram below represents an experiment to show the presence of a component of air – Name another component which if present in the air as a pollutant – would have given a similar observation.

Sulphur dioxide is a gas other than carbon dioxide which turns lime water to milky. Sulphur dioxide evolved from sulphites and also turns lime water milky. Ca ( OH ) 2 + SO 2 → CaSO 3 + H 2 O ( White ppt ) Hence, sulphur dioxide is another component which if present in the air as a pollutant would have given a similar observation.

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NEW SIMPLIFIED MIDDLE SCHOOL CHEMISTRY>Chapter 5 - Air & Atmosphere>OBJECTIVE TYPE QUESTIONS

Dr VIRAF. J. DALAL Solutions for Chapter: Air & Atmosphere, Exercise 2: OBJECTIVE TYPE QUESTIONS

Author:Dr VIRAF. J. DALAL

Dr VIRAF. J. DALAL Chemistry Solutions for Exercise - Dr VIRAF. J. DALAL Solutions for Chapter: Air & Atmosphere, Exercise 2: OBJECTIVE TYPE QUESTIONS

Attempt the free practice questions on Chapter 5: Air & Atmosphere, Exercise 2: OBJECTIVE TYPE QUESTIONS with hints and solutions to strengthen your understanding. NEW SIMPLIFIED MIDDLE SCHOOL CHEMISTRY solutions are prepared by Experienced Embibe Experts.