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Standard VII
Chemistry
Neutralisations in Everyday Life
Question

Paheli observed that most of the fish in the pond of her village were gradually dying. She also observed that the waste of a factory in their village is flowing into the pond which probably caused the fish to die.
i) Explain why the fish were dying.
ii) If the factory waste is acidic in nature, how can it be neutralised?

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Solution
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The wastes of factory may contain high ratio of basic or acidic chemicals. These chemicals make aquatic life difficult.
Base will neutralize the acids. So, by adding the base (limestone, lime etc) into water we can make it less harmful and neutral too.

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Similar Questions
Q1
Paheli observed that most of the fish in the pond of her village were gradually dying. She also observed that the waste of a factory in their village is flowing into the pond which probably caused the fish to die.
i) Explain why the fish were dying.
ii) If the factory waste is acidic in nature, how can it be neutralised?
View Solution
Q2
Paheli observed that most of the fish in the pond of her village were gradually dying. She also observed that the waste of a factory in their village is flowing into the pond which probably caused the fish to die.

(a)Explain neutralisation reaction with an example.
(b)If the factory waste is acidic in nature, how can it be neutralised?
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Q3
In a certain pond, 50 fish were caught, tagged, and returned to the pond. A few days later, 50 fish were caught again, of which 2 were found to have been tagged. If the percent of tagged fish in the second catch approximates the percent of tagged fish in the pond, what is the approximate number of fish in the pond?
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Q4
Five chemical factories, P, Q, R, S, and T, are in different cities along a riverbank. Municipal officers, to estimate the pollution caused by these factories, counted the number of fish present at the places where these factories discharged their waste into the river. A graph as shown here is plotted based on the observations. Tick the correct observation. ​

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Q5
Question 3

Boojho’s uncle has set up an electroplating factory near his village. He should dispose off the waste of the factory.

(a) in the nearby river.
(b) in the nearby pond.
(c) in the nearby cornfield.
(d) according to the disposal guidelines of the local authority.

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