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Assume you have 100g of sample. That means you have 66.6 g of Cu.

The number of moles is: 66.6g /63.6 g/mol = 1.05 moles.Since you have 1 mole of oxygen per 2 moles of Cu, you then have 0.53 moles of oxygen.The weight of the oxygen is then 0.53 mol X 16 g/mol = 8.42 g.Add that to the wieght of the copper and you have 75.02 g of Cu2O in 100 g of sample.That means your sample is 75.02% pure Cu2O

1 mole Na contains 23 g Na

23 g Na =1 mole of Na

1 g Na= 1/23 moles of Na

4.6 g Na= 1/23×4.6= 4.6/23=0.2 moles

Now, 0.2 moles => 0.2 × (6.022 x 10^23) atoms = 1.2 × 10^23 atoms

1 neutal Na atom has 11 electrons=> 1.2 × 10^23 atoms contains= 1.2 × 10^23 × 11 electrons= 13.2 × 10^23 electrons

the correct answer 3

Since Caq/Corg½ is practically constant benzoic acid exists as a dimer (n=2) in benzene.Molecular condition of benzoic acid in benzene is 1/slope = n = 2 , molecules of benzoic acid associate in benzene.

Answer :D) 7Explanation :All halogens containsevenelectrons in their outermost shell. Hence they are kept in group VII-A (17) of a periodic table.So these elements require only one electron to complete the octet

The mass number (symbol A, from the German word Atomgewicht (atomicweight), also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus.

Electronic configuration of elements X= (2, 5)

S orbitals have the largest screening effect for a given n value since s electrons are closer to the nucleus.-p orbital's have the next highest screening effect and then comes d and then f orbital's. Thus in simple terms the screening effect decreases in order :s orbitals > p orbitals> d orbitals> f orbitals.

option 1

Genetic Screening or Testing:Genetic tests are done by analyzing small samples of blood or body tissues. They determine whether you, your partner, or your baby carry genes for certain inheriteddisorders. Genetic testing has developed enough so that doctors can often pinpointmissingordefectivegenes.

Answer of this question 1st option

H2s is the oxidising agent

H2S has been oxidised

here SO2 has been oxidized

Answer = H2s has oxidised

Hydrogen sulphide has been oxidized

i is correct answer in this questions

h2s is being oxidised because

losing of electrons is know as oxidation

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No. of balloons that can be filled =Vof H2available/Vof one balloon

Calculation of total volume of hydrogen in the cylinder at N.T.P

P1V1/T1=PV2/T2

P1= 1 atmP2= 20 atm

V1= ?V2= 2.82 l

T1= 23 KT2= 273 + 27 = 300 K

∴V1= 20 * 2.82 * 273/300 * 1 = 51.324 l = 51324 ml

Actual volume to be transferred into balloons

= 51324 – 2820 ml = 48504 ml

[∵ 2820 ml of H2will remain in cylinder]

No. of balloons that can be filled up -= 48504/4851 = 9.999 =10

Volume of one balloon = 4/3 πr3= 4/3 * 22/7 * (21/2)3

[∵r= diameter/2]

= 4851 ml = 4.851L

ALTERNATE SOLUTION:

Volume of balloon = 4.851 L (as calculate above)

Let no. of balloon to be filledn

∴ Total volume occupied bynballoons = 4.851 *n

Volume of H2present in cylinder = 2.82 L (given)

∴ Total volume of H2at NTP = (4.851n + .82)L

P1= 1 atmP2= 20 atm

V1= 4.85 * n + 2.82 LV2= 2.82 L

T1= 273 K

P1V1/T1=P2V2/T2

or 1 * (4.85 * n + 2.82)/273 = 20 * 2.82/300

∴n= 48.504/4.851 = 10

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In ecology and Earth science, a biogeochemical cycle or substance turnover or cycling of substances is a pathway by which a chemical substance moves through biotic (biosphere) and abiotic (lithosphere, atmosphere, and hydrosphere) compartments of Earth.

night blindness.

It's already balanced equation

2Ag + Cu(NO3)2 ---> 2AgNo3 + Cu

2Ag + Cu(NO3)2 ---> 2AgNo3 + 2cu

Z= 151s2 2s2 2p6 3s2 3p3number of unpaired electron in ground state is 1 and in hybridization is 3

Bohr's orbits are called as stationary states because as we know that if an object moves in circular path it will lose energy but, according to bohr electrons which is moving in the circular path does not lose energy.if electrons lose energy they will fall into nucleus and get burnt.

when we take one mass then center to that is called centre of mass

Thecenter of mass isthe mean position of the mass in anobject. Then there's thecenter of gravity, whichisthe point wheregravity appears to act. For many objects, these two points are in exactly the same place. But they're only the same when the gravitational fieldisuniform across an object.

when we take one full gravity then centre to the gravity is called center of gravity

1)..3

Chromium is in Group 6 so Cr3+ has (6 – 3) = 3 d electrons: 3d3. To maximize the number of unpaired electrons, this leads to theconfigurationbelow with 3 unpaired electrons.

Electron configurations are the patterns of arrangement of electrons that are associated with a certain molecule or atom. In order to figure the electron configuration of an element, you've got to know the atomic number.

Vanadium's atomic number is 23 which means 1s2 2s2 2p6 3s2 3p6 4s2 3d3. Each of these is based on the letter associated with it, s can hold 2, p can hold 6, d can hold 10 and f can hold 14. However, you need to stop at 23 which is why things stop at 3d3.

but i have asked for venadium negatively charged

Vanadium is a chemical element with symbol V and atomic number 23. Electron configurationis [Ar] 3d34s2.WWhen one more electron is added its negative charge increases. So V(24 electrons) is negatively charged.

solution weight is 518gmand 18gm glucose addedhence total becomes 518+18=536gm% glucose=18/536*100=3.35%

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Lambda =3.6 Å = 3.6*10^-10m

Velocity of photon = velocity of light

M = h/lambda*v = 6.626*10^-34js/ (3.6*10^-10m)(3*10^8 m/s)

= 6.135*10^-29 Kg

Therefore, Mass of photon= 6.135*10^-29 Kg

The no. of unpaired electrons in P = 3.Si = 2cr= 6Fe = 4kr = 0

Equivalent wt. of dibasic acid = mol. wt/2

= 200/2 = 100

Strength = 0.1 N,

m = ? ,

V = 100 mL then,

m = EVN/1000 = (100 x 100 x 0.1)/1000

= 1gm.

Aqueous is a term used to describe a system which involves water.

Isomerism, the existence of molecules that have the same numbers of the same kinds of atoms (and hence the same formula) but differ in chemical and physical properties. ... Stated colloquially, isomers are chemical compounds that have the same parts but are nonetheless not the same.

the molecular and iupac name of C4H10 orCH3CH2CH2CH3 is butane. and structure is.

what is nonthless

nonetheless means nearby

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option (3) is correct.

Bakelite is a thermosetting plastic (phenol-formaldehyde resign). It is used for making TV cabinets, telephone components, billiard ball, bearings, electrical goods etc.

It is prepared by the polymerisation reaction between formaldehyde and phenol.

In the formation of Bakelite, the reaction mixture is prepared by mixing formaldehyde with phenol with glacial acetic acid under fume hood.

Some quantity of reaction mixture is taken in a beaker and placed on a white paper towel.

10 to 12ml of conc. Hydrochloric acid is added drop by drop by continuous stirring.

On heating polymerisation begins, white precipitate starts appearing (60-55 degree C).

On vigorous and constant stirring pink colour plastic forms (75 to 60 degree C).

The reaction is very fast and heat of the reaction is also high

Kohlrausch's lawstates that the equivalent conductivity of an electrolyte at infinite dilution is equal to the sum of the conductances of the anions and cations. Thelaw, which depends on the independent migration of ions, was deduced experimentally by the German chemist FriedrichKohlrausch.However, values for weak electrolytes can be determined by using theKohlrausch'sequation. (ii) Determination of the degree of ionisation of a weak electrolyte: TheKohlrausch's lawcan be used for determining the degree of ionisation of a weak electrolyte at any concentration.

The IUPAC name of the given coordinate compound

[Co(en)2Cl2]Cl isdichlorobis(ethylenediamine)cobalt(iii)chloride .

Ans :- Silicones, also known as polysiloxanes, are polymers that include any inert, synthetic compound made up of repeating units of siloxane, which is a chain of alternating silicon atoms and oxygen atoms, combined with carbon, hydrogen, and sometimes other elements.

Sheet silicone is used to manufacture gaskets used in automotive engines, transmissions, and other applications. Additionally, silicone compounds such as silicone rubber are used as coatings and sealants for airbags; the high strength of silicone rubber makes it an optimal adhesive and sealant for high impact airbags.

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Silicones, also known as polysiloxanes, are polymers that include any synthetic compound made up of repeating units of siloxane, which is a chain of alternating silicon atoms and oxygen atoms, combined with carbon, hydrogen, and sometimes other elements.

These polymers are made up of siloxane – a chain of alternating silicon atoms and oxygen atoms frequently combined with carbon and/or hydrogen.

Siliconesmay be obtained in the form of oils, rubber on resins depending upon the extent of polymerization which depends upon reaction conditions and nature of alkyl groups.

24Na11 → 24Mg12 + 0ß-1

product is cyclic 4 Carbon computer or cyclobutane

Given the volume of solution is = 600mland moles of solute is = 10/100 = 0.1 moles

and density is given , so mass of solution = V*d = 600*1.02 = 612gm

so, mass of solvent = 612-10g = 602

assume solvent is water(d=1gm/ml) so, volume of water = 602/1 = 602ml

therefore M = mol/L = 0.1/0.602 = 0.16 = 0.17M

option 1

Silicones, also known aspolysiloxanes, arepolymersthat include any inert, synthetic compound made up of repeating units ofsiloxane, which is a chain of alternatingsiliconatoms andoxygenatoms, combined withcarbon,hydrogen, and sometimes otherelements. They are typically heat-resistant and either liquid orrubber-like, and are used in sealants, adhesives, lubricants, medicine, cooking utensils, and thermal and electrical insulation. Some common forms includesilicone oil,silicone grease,silicone rubber,silicone resin, and siliconecaulk.

Dialysis is a treatment that filters and purifies the blood using a machine. This helps keep your fluids and electrolytes in balance when the kidneys can't do their job.

Thk vai.

The spin quantum number is the fourth quantum number, denoted by s or ms. The spin quantum number indicates the orientation of the intrinsic angular momentum of an electron in an atom. It describes the quantum state of an electron, including its energy, orbital shape, and orbital orientation.

In one orbital, the orientation of the two electrons is always the opposite of each other. One electron will be spin up, and the other electron is spin down. If the last electron that enters is spin up, then ms = +1/2. If the last electron that enters is spin down, then the ms = -1/2