1
MCQ (Single Correct Answer)

JEE Main 2017 (Online) 9th April Morning Slot

Which of the following is a set of greenhouse gases ?
A
CH4, O3, N2, SO2
B
O3, N2, CO2, NO2
C
O3, NO2, SO2, Cl2
D
CO2, CH4, N2O, O3
2
MCQ (Single Correct Answer)

JEE Main 2018 (Offline)

The recommended concentration of fluoride ion in drinking water is up to 1 ppm as fluoride ion is required to make teeth enamel harder by converting
[3Ca3 (PO4)2.Ca(OH)2] to
A
[3{Ca(OH)2}. CaF2]
B
[CaF2]
C
[3(CaF2). Ca(OH)2]
D
[3Ca3(PO4)2. CaF2]

Explanation

3
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 9th January Morning Slot

A water sample has ppm level concentration of the following metals : Fe = 0.2; Mn = 5.0; Cu = 3.0; Zn = 5.0. The metal that makes the water sample unsuitable for drinking is :
A
Cu
B
Mn
C
Fe
D
Zn

Explanation

When Mn present in water with concentration 0.05 ppm or more than this then the water is unsuitable for drinking.

Here given concentration for Mn is 5.0, which is grater than 0.05 that is why it is Mn makes water unsuitable for drinking.

For other metal water is suitable for drinking when concentration for Fe = 0.2 ppm and for Cu = 3.0 ppm and for Zn = 5.0 ppm.
4
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 9th January Evening Slot

Which of the following conditions in drinking water causes methemoglobinemia ?
A
> 50 ppm of lead
B
> 50 ppm of chloride
C
> 50 ppm of nitrate
D
> 100 ppm of sulphate

Explanation

Concentration of nitrate > 50 ppm in drinking water causes methemoglobinemia

Questions Asked from Environmental Chemistry

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