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The reason is that a large number of vehicles are stationary for extended periods of time, which makes the smoke and dust accumulate in a higher concentration there.

so1/2*3= 1/6= 1/6*6= 1/361/36*8/38/36*32/27

2/27 is correct... good

Answer of this question is 216

Peat organic variety of coalPeat is formed from decaying vegetation, and is considered to be the precursor of coal

i) Graphite is correct option.

Graphite,is a crystalline allotrope of carbon.

It's wrong

Correct formula isCH3 - CH = CH2

solubility product is s² = 4.9×10^-9=> s² = 49×10^-10=> s = √49×10^-10=> s = 7×10^-5

so, solubility is s = 7×10^-5

Asolubility curveis a graphical representation of thesolubilityof a particularsolutein a given solvent with respect to varying temperatures. ... Chemists often use the technique of liquid-liquid extraction to identify thesolubilitiesof compounds to separate andpurifythem from reaction mixtures.

Farnesol is a colorless liquid extracted from oils of plants such as citronella, neroli, cyclamen, and tuberose. It is an intermediate step in the biological synthesis of cholesterol from mevalonic acid in vertebrates. It has a delicate odor and is used in perfumery.

Geographic isolation is a term that refers to a population of animals, plants, or other organisms that are separated from exchanging genetic material with other organisms of the same species. Typically geographic isolation is the result of an accident or coincidence.

The rule states that :

"when an unsymmetrical alkene reacts with a hydrogen halide to give an alkyl halide, the hydrogen adds to the carbon of the alkene that has the greater number of hydrogen substituents, and the halogen to the carbon of the alkene with the fewer number of hydrogen substituents"

The purpose of KOH is to normally absorb the CO2 released during respiration.

If they forget to put a conical flask with KOH then the results will vary because the air released will be having CO2 since it was not absorbed as plannned at the beginning of the experiment thus hindering the expected observations.

When phenol is heated with zn dust reduction of phenol occurs and it gets converted into Benzene with ZnO as a by-product.Phenol+Zn⟶Benzene+ZnO mechanism;

Zn shows an oxidation state of +2.

The phenol gets converted into phenoxide ion and proton thus released accepts an electron from Zn forming H radical.

Also because of the heating there is homolytic fission of C of phenyl ring and O-

The O- thus formed accepts an electron from Zn and forms oxide ion.

In this way zinc forms zinc oxide and phenyl radical thus produced forms a bond with H radical.

However, the yield of this reaction used for benzene formation is lower.

when chlorine is passed over dry slaked lime, bleaching powder will form.

equation ---: Ca(OH)2 + Cl2 ---> CaOCl2 + H2O.

properties --: it is used as an oxidising agent in many chemical industries.

it is used for distinfecting drinking water to make it free of germs

it is used for bleaching cotton , linen in textile industry.

The reaction between hexene and bromine in presence of light gives 3-bromocyclohexene.

why it does not show addition reaction

When we mix barium hydroxide with ammonium chloride, the bottom of the test tube becomes cold due to absorption of heat. So, it is an endothermic reaction.

This reaction absorbs heat from its environment to be completed, so it is an endothermic reaction.

Ba(OH)2+NH4Cl===>BaCl2+NH4OH

Respiration in plants can be studied in moist germinating seeds that release carbon dioxide (CO2) during respiration. Potassium hydroxide absorbs carbon dioxide released by the seeds and a partial vacuum is created in the flask as a result.

thanks

56. D57. D58. B

Answer is (3) Cl2CHCHO

(b) Activation energy of a chemical reaction is related to rate constant of a reaction at two different temperatures i.e.,K1 and K2 respectively.

why a is wrong.thanks

but why option a is wrong

bromo benzene.

alpha D glocose and beta D glucose are anomer

Oxidation of glucose in the body cell

100 mL of 0.5 N NaOH, = 0.100 L x 0.5 N = 0.05 equivalent moles

100 mL of N/5 HCL = 0.100 L x 0.2 N = 0.02 equivalent moles

100 mL of N/10 H2SO4 = 0.100 L x 0.1 N = 0.01 equivalent moles

0.02 equivalent moles of HCl will neutralise 0.02 equivalent moles of NaOH

And 0.01 equivalent moles of H2SO4 will neutralise 0.01 equivalent moles of NaOH

So unreacted equivalent moles of NaOH = 0.05 - (0.02 + 0.01) = 0.02

The resulting solution will be basic containing 0.02 equivalent moles of NaOH = 0.02 / 0.300 L = 0.067 N NaOH

When iron mixed with sulphur and heated then it forms Ferrous sulphide (A) which on treatment with dilute HCl produces Ferrous chloride and Hydrogen sulphide gas.FeS + HCl →FeCl₂ + H₂S↑If the mixture is not heated (B) remains as mixture (Fe + S) if it treated with dilute HCl then it produces Hydrogen gas along with Ferrous chloride . Since only iron reacts (Slowly) with HCl.(Fe + S) +2 HCl → FeCl₂ + H₂↑

Gases evolved in the electrolysis of water are hydrogen and oxygen

h2Omeans hidrogen and oxygen

hydrogen and oxygen evolved

Properties of Ozone

Ozone absorbs radiation strongly in the ultraviolet region of the atmospheric spectrum between 220-290 nm. This protects the Earth and its inhabitants from the harmful ultraviolet radiation of the Sun. Without this protective layer, more ultraviolet radiation would reach the surface of the Earth and cause damage to plant, animal and human life.

Pure ozone is a blue gas, with a strong irritating smell. When inhaled, it causes headache and nausea. In smaller proportions it smells pleasant.

It is about 1.5 times heavier than air and has a vapor density of 24, corresponding to the formula O3.

It is more soluble than oxygen in water, about 49% by volume at 0°C.

It gets liquefied to a deep blue colour liquid, when cooled in liquid air.

It boils at 161.2 K and solidifies to violet-black crystals, which melt at 80.6 K.

It dissolves readily in turpentine oil and acetic acid.

40 is tje correct answer

40 is the correct answer

40 is the right answer

40 is the right answer

Sol. If x g of both oxygen and methane are mixed then : Mole of oxygen = x/32 Mole of methane = x/16 ⇒ mole fraction of oxygen = (x/32)/(x/32 + x/16) = 1/3 According to law of partial pressure Partial pressure of oxygen (po2) = mole-fraction × total pressure ⇒ 〖Po〗_2/p = 1/3

If x g of both oxygen and methane are mixed then :

Mole of oxygen = x/32

Mole of methane = x/16

⇒ mole fraction of oxygen = (x/32)/(x/32 + x/16) = 1/3

According to law of partial pressure

Partial pressure of oxygen (po2) = mole-fraction × total pressure

⇒ Po2/p = 1/3

b. Square pyramidal (based on octahedral)

thank u

A is the answer of the following

When is converted into then the change in oxidation number of chromium is zero.

In case of

K has charge +1.Cr has charge x.O has charge -2.The charge on this whole molecule is 0. Therefore, the oxidation number of Cr is calculated as follows.

2 + 2x - 14 = 0

x = 6

In case of

K has charge +1.Cr has charge x.O has charge -2.The charge on this whole molecule is 0. Therefore, the oxidation number of Cr is calculated as follows.

2 + x - 8 = 0

x = 6

Thus, it can be concluded that there is no change in the oxidation state of Chromium .

the answer of the following question is option (a)

B is because O. N of o is -2 and k is 1, so let cr be x and 2 + x+(-2×4)=+6

option a is the correct answer of this question

(a) is the right answer of following questions

option b is the correct answer of the given question

option (a) is the right answer.

option A is the right answer

according to the uncertainty principle,∆x∆p ≥h/4πhere, ∆x=0.002nmtherefore, ∆p≥h/4π*0.002*10^-9∆p≥5.27*10^(-35)/0.002*10^(-9)∆p≥2.635*10^-23

if the momentum of electron is defined with the certainty then there will be uncertainty in the definition of its position due to the Heisenberg's uncertainty principle. whenever we measure momentum of a particle there will be an uncertainty and its position as the two operators of position and Momentum do not commute.

In case of substituted aromatic compounds, the functional groups already present directs the next incoming group to a particular position in the aromatic ring. It is called directive influence of the group already attached to the benzene ring.

-CH3 group is an ortho and para directing group.

define it

Antibiotic resistance occurs whenbacteriachange in response to the use of thesemedicines.Bacteria, not humans or animals, become antibiotic-resistant. Thesebacteriamay infect humans and animals, and the infections theycauseare harder to treat than those caused by non-resistantbacteria.

Haloarenes react with halogens in the presence of ferric salt as catalyst to give ortho para isomers.

This effect is due to the atmospheric refraction of light. At the time of sunrise or sunset, the sun is just near the horizon. The line XY represents the horizon for an observer O on the surface of the earth.

Near the surface of earth, air is a little denser than the outer space. The refractive index of the air near the surface of earth is 1.00029 w.r.t. the outer space. Therefore, a ray of light travelling from the sun towards the earth, travels through air, which becomes more and more optically denser. Due to this, it undergoes refraction and therefore gradually deviates towards the normal. As a result, to the observer O on the surface of earth, the sun appears at S'. The apparent shift in the direction of the sun is only 0.5 and the time difference between the actual sunset and the apparent sunset is about 2 minutes.

Option c)

If an electron makes a transition from the n = 4 to the n = 1 Bohr orbital in a hydrogen atom, determine the wavelength of the light emitted and the recoil speed of the atom.

Solution: To determine the wavelength, we use

n= 5 to which state ? is it ground state your are asking??

sorry ground state

frequency=c/wavelengthhencef=3*10^8/3*10^-6=10^14Hz

The shortest wavelength transition in the Barlmer series corresponds to the transitionn = 2 → n = ∞. Hence, n1 = 2, n2 = ∞ Balmer

Where are the lines in the figure.

Question is not full

wavenumber =1/wavelength=1/5800*10^-101.72*10^6 frequency=c/wavelength=3*10^8/5800*10^-10=51kHz