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1
JEE Main 2019 (Online) 8th April Evening Slot
MCQ (Single Correct Answer)
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-1
Out of Syllabus
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The maximum prescribed concentration of copper in drinking water is :
A
3 ppm
B
5 ppm
C
0.5 ppm
D
0.05 ppm
2
JEE Main 2019 (Online) 8th April Morning Slot
MCQ (Single Correct Answer)
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-1
Out of Syllabus
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Assertion : Ozone is destroyed by CFCs in the upper stratosphere.

Reason : Ozone holes increase the amount of UV radiation the earth.
A
Assertion and reason are both correct, and the reason is the correct explanation for the assertion.
B
Assertion and reason are incorrect.
C
Assertion and reason are correct but, the reason is not the explanation for the assertion
D
Assertion is false, but the reason is correct.
3
JEE Main 2019 (Online) 8th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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Which is wrong with respect to our responsiblity as a human being to protect our environment?
A
Restricting the use of vehicles
B
Setting up compost tin in gardens.
C
Avoiding the use of floodlighted facilities
D
Using plastic bags.
4
JEE Main 2019 (Online) 12th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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The compound that is NOT a common component of photochemical smog is :
A
O3
B
JEE Main 2019 (Online) 12th January Evening Slot Chemistry - Environmental Chemistry Question 76 English Option 2
C
CH2 = CHCHO
D
CF2Cl2
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