At T (K), 100 L of dry oxygen is present in a sealed container. It is subjected to silent electric discharge, till the volumes of oxygen and ozone become equal. What is the volume (in litres) of ozone formed at T (K) ?

• 50

• 60

• 30

• 40

Bhopal gas tragedy of 1984 was caused by

• carbon monoxide

• phosgene

• methyl cyanate

• methyl isocyanate

Among the following compounds, which one is not responsible for depletion of ozone layer?

• CH₄

• CFCl₃

• NO

• Cl₂

The chemical entities present in thermosphere of the atmosphere are

• O${}_2^{+}$, O⁺, NO⁺

• O₃

• N₂, O₂, CO₂, H₂O

• O₃, O${}_2^{+}$, O₂

The acceptable level of carbon monoxide gas (CO) in the atmosphere in ppm level is

• 9

• 250

• 49

• 850

Which air pollutant is responsible for Bhopal gas tragedy?

• PIC

• CFC

• MIC

• CO

127.

The pair of gases responsible for acid rain are

• H₂, O₃

• CH₄, O₃

• NO₂, SO₂

• CO, CH₄

Cataract and skin cancer are caused by

• depletion of nitric oxide

• depletion of ozone layer

• increase in methane

• depletion of nitrous oxide

On the top of mountain, water boils at

• high temperature

• same temperature

• high pressure

• low temperature

What are X and Y in the following reaction?

${\mathrm{CF}}_2{\mathrm{Cl}}_2 \stackrel{\mathrm{UV}}{\to } \mathrm{X} + \mathrm{Y}$

• CF₂Cl, Cl

• C₂F₄, Cl₂

• CFCl₂, F

• CCl₂, F₂