Advertisements
Advertisements
Question
Long answer type question
Montreal protocol is an essential step. Why is it so?
Advertisements
Solution
i. Recognising the harmful effects of ozone depletion, an international treaty, known as the Montreal Protocol was signed at Montreal (Canada) in 1987 to control the emission of ozone-depleting substances.
ii. Later, many more efforts have been made and protocols have laid down definite roadmaps separately for developing and developed countries for reducing the emission of CFCs and other ozone-depleting chemicals.
iii. Montreal Protocol primarily focuses on chloro or Bromo derivates of hydrocarbons which are the main reasons for the depletion of the ozone layer.
iv. Montreal Protocol has provided a mechanism to reduce and phase-out the global production and consumption of substances that deplete the ozone layer.
v. Montreal Protocol has helped in successfully reducing the global production, consumption, and emissions of substances that deplete the ozone layer.
vi. Encouraging evidence for recovery of stratospheric ozone has been found. If the Montreal Protocol was not brought in, ozone depletion likely would be much greater than observed today. Hence, the Montreal Protocol is an essential step.
APPEARS IN
RELATED QUESTIONS
The depletion of ozone layer in the upper atmosphere is mainly due to the emission of :
(a) unburnt hydrocarbons
(b) chlorofluorocarbons
(c) greenhouse gases
(d) ultraviolet radiations
The gas A is used by most of the animals to obtain energy from food by the process of respiration. When A is acted upon by radiation X, it gets converted into another gas B which is an allotrope of A but poisonous when inhaled. B forms a kind of layer C in the upper atmosphere which absorbs radiations X coming from a source Y and prevent them from reaching the earth. Some chemicals Z released from the various devices on the earth are destroying the layer C slowly. In fact, a hole has already been formed in layer C over the area D of the earth.
(a) What are gases (i) A, and (ii) B? Write their molecular formulae.
(b) Name the layer C.
(c) What are (i) X, (ii) Y, and (iii) Z?
(d) Name the area D.
(e) Name any two human ailments which may be caused by X.
Which class of carbon compounds is responsible for the depletion of ozone layer at the higher level of the atmosphere?
The depletion of the ozone layer is due to ______.
Fill in the Blanks:
The ______ is the layer of the atmosphere that contains the protective ozone layer
Ozone is abundant in this layer. Ozone heats this layer as it absorbs from incoming ultraviolet radiation from the sun:
Give balanced equation for the following conversion [one or two steps].
A molecule of ozone to two molecules of oxygen gas.
Name or state the following:
The atom which reacts with oxygen to form ozone.
Depletion of ozone is mainly due to
Why is ozone layer getting depleted at the higher levels of the atmosphere? Mention one harmful effect caused by its depletion.
