Redox Reactions
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New answer posted
4 months agoContributor-Level 10
This is a Assertion Type Questions as classified in NCERT Exemplar
Option (iv)
i.e., A is not correct, but R is correct since ozone in the stratosphere is a product of ultraviolet radiations falling on oxygen molecules. The main cause of ozone layer depletion is the release of CFCs i.e., freons. With the depletion of the ozone layer, more ultraviolet radiation filters into the troposphere. These radiations lead to ageing of skin, cataract, sunburn, skin cancer etc.
New answer posted
4 months agoContributor-Level 10
This is a Assertion Type Questions as classified in NCERT Exemplar
Option (ii)
i.e., Both A and R are correct, but R is not the correct explanation of A is the answer since the increased amount of carbon dioxide in the air is the main cause for global warming. Excess of carbon dioxide gets released into the atmosphere and is removed by green plants which maintains an appropriate level of carbon dioxide into the atmosphere.
New answer posted
4 months agoContributor-Level 10
This is a Assertion Type Questions as classified in NCERT Exemplar
Option (i)
i.e., Both A and R are correct, and R is the correct explanation of A is the answer since a photochemical smog has high concentration of oxidizing agents and is known as oxidizing smog. Two of the pollutants that are emitted are hydrocarbons (unburned fuels) and nitric oxide (NO). When these pollutants build up to sufficiently high levels, a chain reaction occurs from their interaction with sunlight in which NO is converted into nitrogen dioxide and this in turn absorbs energy from the sunlight and breaks up into nitric oxide and free oxygen atoms. This i
New answer posted
4 months agoContributor-Level 10
This is a Assertion Type Questions as classified in NCERT Exemplar
Option (ii)
i.e., Both A and R are correct, but R is not the correct explanation of A is the answer the pH of rainwater is 5.6 because of the presence of hydronium ions produced due to the dissolution of carbon dioxide in rainwater from atmosphere and when the pH of rainwater drops from 5.6, it is being referred as acid rain. This can be shown as-
H2O (l)+CO2 (g)→H2CO3 (aq)
H2CO3 (aq)→H+ (aq)+HCO3− (aq)
New answer posted
4 months agoContributor-Level 10
This is a Assertion Type Questions as classified in NCERT Exemplar
Option (iii)
i.e., Both A and R are not correct is the answer since in cold places, sunlight required to grow plants is less. Due to which plants are kept in a glass house so that sunlight enters in the greenhouse to heat up the soil and plants. The warm soil and plants emit infrared radiations which are partially absorbed and partially reflected by the glass.
New answer posted
4 months agoContributor-Level 10
This is a Short Answers Type Questions as classified in NCERT Exemplar
Excessive amount of sulphate (i.e., greater than 500 ppm) in drinking water causes laxative effect, otherwise at moderate levels it is harmless.
New answer posted
4 months agoContributor-Level 10
This is a Short Answers Type Questions as classified in NCERT Exemplar
Scientists working in the Antarctica region reported that depletion of the ozone layer is commonly termed as an ozone hole over the South Pole in the Antarctic region. It was observed that a unique set of conditions were responsible for the ozone hole. In summer, nitrogen dioxide and methane react with chlorine monoxide and chlorine atoms forming chlorine sinks, preventing much ozone depletion, whereas in winter, special types of clouds called polar stratospheric clouds are formed over Antarctica. These polar stratospheric clouds provide a surface on whic
OH (g) + Cl (g)
2Cl (g)New answer posted
4 months agoContributor-Level 10
This is a Short Answers Type Questions as classified in NCERT Exemplar
Ozone is found to be thermodynamically unstable and undergoes decomposition into molecular oxygen and a dynamic equilibrium exists between the production and decomposition of ozone. The reactions involved can be shown as-
O2 (g) 
O (g) + O (g)
O (g) + O2 (g) +M
O3 (g) + M
New answer posted
4 months ago
Contributor-Level 10
This is a Assertion and Reason Type Questions as classified in NCERT Exemplar
Option (ii) is the correct answer.
A redox couple is defined as pair of compounds or elements having together the oxidised and reduced forms of it and taking part in an oxidation or reduction half reaction.
New answer posted
4 months agoContributor-Level 10
This is a Assertion and Reason Type Questions as classified in NCERT Exemplar
Option (i) is the correct answer.
Here the oxygen of peroxide, which is present in -1 state, is converted to zero oxidation state in O2 undergoing oxidation and decreases to -2 oxidation state in H2O undergoing reduction
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