Please select a subject first
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Fill in the blank with the correct word from the options given below:
Compounds are always _______ in nature.
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In the figure given alongside
(a) Name the shells denoted by A,B, and C. Which shell has least energy
(b) Name X and state the charge on it
(c) The above sketch is of …………. Model of an atom
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Give the postulates of Bohr's atomic model
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Helium is an unreactive gas and neon is a gas of extremely low reactivity. What, if anything, do their atoms have in common.
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State two effects of ozone depletion.
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Describe the methods of saving the ozone layer.
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State the chemicals responsible for ozone layer destruction.
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What is an ozone layer. State the distribution of the ozone layer in the stratosphere.
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Give balanced equations for formation of ozone molecules from oxygen molecules. What type of reaction takes place, during the formation.
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How is the ‘ozone oxygen cycle’ maintained in the stratosphere and state what disturbs the balance, resulting in ozone depletion or destruction, Give balanced equation for the same.
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Enumerate the damage to humans, animals and plants caused due to ozone depletion.
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Name the chemicals responsible for destruction of the ozone layer. State the main chemical from these chemicals, which is responsible for more than 80% ozone depletion.
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State the role of chlorofluorocarbons in ozone destruction or depletion [no equations required].
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Enumerate methods of protecting the ozone layer and preventing its depletion.
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State how CFCs break ozone in the stratosphere.
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Select the correct answer from the following statement:
The gas which in presence of U.V. light gives two atoms of the same gas.
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Select the correct answer from the following statement:
A chemical responsible for ozone depletion.
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Give balanced equation for the following conversion [one or two steps].
A molecule of ozone to two molecules of oxygen gas.
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Give balanced equation for the following conversion [one or two steps].
Oxygen to ozone gas by photolysis.
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Give reason for the following:
The formation of ozone involves a chemical reaction called photolysis.
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