Chemistry
Get insights from 6.9k questions on Chemistry, answered by students, alumni, and experts. You may also ask and answer any question you like about Chemistry
Follow Ask QuestionQuestions
Discussions
Active Users
Followers
New answer posted
a year 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
a year 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 is show
New answer posted
a year 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
a year 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
a year agoContributor-Level 10
This is a Short answer 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
a year agoContributor-Level 10
This is a Short answer 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 which chlor
OH (g) + Cl (g)New answer posted
a year agoContributor-Level 10
This is a Short answer 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
a year agoContributor-Level 10
This is a multiple choice answer as classified in NCERT Exemplar
(i) Mole fraction
Explanation: The mole fraction (x) is important for determining the relationship between a solution's concentration and its vapour pressure. Rault's law states that p1 = x1 po1 in a binary solution of two volatile liquids, where p1 is the vapour pressure of component 1, x1 is its mole fraction in solution, and po1 is the vapour pressure of pure solvent.
New answer posted
a year agoContributor-Level 10
This is a short answer type question as classified in NCERT Exemplar
"A sheet of cellulose acetate laid over a suitable support" is the material used to make a semipermeable membrane for reverse osmosis.
New answer posted
a year agoContributor-Level 10
This is a short answer type question as classified in NCERT Exemplar
Semi permeable membranes are continuous sheets or films (natural or synthetic) that have a network of submicroscopic holes or pores through which small solvent molecules like water may pass but larger molecules of solute cannot. Osmosis is the process of diffusion via this membrane.
Taking an Exam? Selecting a College?
Get authentic answers from experts, students and alumni that you won't find anywhere else
Sign Up on ShikshaOn Shiksha, get access to
- 66k Colleges
- 1.2k Exams
- 703k Reviews
- 1850k Answers