Notes | EduRev

JEE Main Mock Test Series 2020 & Previous Year Papers

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JEE : Notes | EduRev

The document Notes | EduRev is a part of the JEE Course JEE Main Mock Test Series 2020 & Previous Year Papers.
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Question 1: Why does rain water have a pH of about 5 – 6?
Solution:  Normally rain has a pH of about 5 – 6 due to dissolution of  of the atmosphere into it.
 Notes | EduRev

Question 2: Explain giving reasons. ‘The presence of CO reduces the amount of haemoglobin available in the blood for carrying oxygen to the body cells’.
Solution: CO combines with haemoglobin of the red blood corpuscles about 300 times more easily than oxygen to form carboxy haemoglobin reversibly as follows:
 Notes | EduRev
Thus it is not able to combine with oxygen to form oxyhaemoglobin and transport of oxygen to different body cell cannot take place.

Question 3: Why is acid rain considered as a threat to ‘Taj Mahal’?
Solution: Taj Mahal is made of marble. The acid rain contains which attacks the marble  thereby pitting it, decolourising it and making it lustreless.

Question 4: The acid rain does not contain 
(a) Sulphuric acid
(b) Nitric acid
(c) Sulphurous acid
(d)  Acetic acid
Solution: Nitrogen oxides & acidic soots. Sulphurdioxide & nitrogen dioxide interact with water vapours in presence of sunlight to form sulphuric acid & nitric acid units.
 Notes | EduRev
Acid rain contains sulphuric acid, nitric acid, sulphurous acid but does not contain acetic acid.
Hence, the correct option is D.

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