JEE Main 2018 (Online) 15th April Evening Slot | Environmental Chemistry Question 88 | Chemistry

Biochemical Oxygen Demand (BOD) value can be a measure of water pollution caused by the organic matter. Which of the following statements is correct ?

Aerobic bacteria decrease the BOD value.

Anaerobic bacteria increase the BOD value.

Clean water has BOD value higher than 10 ppm.

Polluted water has BOD value higher than 10 ppm.

JEE Main 2017 (Online) 9th April Morning Slot

MCQ (Single Correct Answer)

-1

Out of Syllabus

Which of the following is a set of greenhouse gases?

CH₄, O₃, N₂, SO₂

O₃, N₂, CO₂, NO₂

O₃, NO₂, SO₂, Cl₂

CO₂, CH₄, N₂O, O₃

JEE Main 2017 (Online) 8th April Morning Slot

MCQ (Single Correct Answer)

-1

Out of Syllabus

Identify the pollutant gases largely responsible for the discoloured and lustreless nature of marble of the Taj Mahal.

O₃ and CO₂

CO₂ and NO₂

SO₂ and NO₂

SO₂ and O₃

JEE Main 2017 (Offline)

MCQ (Single Correct Answer)

-1

Out of Syllabus

A water sample has ppm level concentration of following anions
F^- = 10; $$SO_4^{2-}$$ = 100; $$NO_3^-$$ = 50
The anion/anions that make/makes the water sample unsuitable for drinking is/are :

both $$SO_4^{2-}$$ and $$NO_3^-$$

only F^-

only $$SO_4^{2-}$$

only $$NO_3^-$$

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