Explore topic-wise InterviewSolutions in .

The negative and positive charges of electrons and protons respectively are equal in magnitude. So, the atom as a whole is electrically neutral.

w= mg12*9.8117.6kg

b.

I think 1 no right answer.

(c) is a correct answer

Helium atom mass is 4 and in 2 protons so Helium atom mass = Helium Protons number + Helium neutrons 4= 2 + Helium neutrons Helium neutrons = 4-2 =2

A StandardHydrogen Electrode(SHE) isan electrodethat scientists use for reference on all half-cellpotentialreactions. The value of the standardelectrode potentialis zero, which forms the basis one needs to calculate cellpotentialsusing differentelectrodesor different concentrations.Option A

thank you but R1=15ohm

12th line explain in more detail

Option C is rightthanks

molecular mass of CaCO3=100mole of CaCO3=20/100 =.2 molemolarit of CaCO3=.2/10 =.02LtCaCO3 ------------->CaO +CO2.02 0 0.02-x x xKp =pCO21.16=x*.082*1073x=.013unreacted=.007percentage=35%

Heat can cause thermal expansion which can lead to greater surface contact pressures leading higher heating rate of heating. It can lead to a highly destructive "thermal runaway" situation. Generally when two friction surfaces contact, the microscopic surface high points known as "asperities" contact each other and break off resulting in breakaway wear particles. Hydrodynamic fluid lubrication is usually the best way to avoid friction induced heating. The science of surface interaction studies is known as "tribology".

(a) The characteristics of matter demonstrated by diffusion are :1) Matter is made up of tiny particles.2) The particles of matter have large space in between them.Â(b) The characteristics of matter demonstrated by Brownian motion are :1) The matter is made up of tiny particles.2) Particles move randomly and collide with one another.

The solubility product, Ksp, applies in situations where salts do not fully dissolve in a solvent. The solvent is generally water. A substance's solubility product is the mathematical product of its dissolved ion concentrations raised to the power of their stoichiometric coefficients.

You can try laser. It may work or A magnetic field should exert a force on the filament when the torch is on. If the magnet is strong enough, this could be enough to break it.

1.(b) is the right answer

The perfection of the cyanide process largely replaced amalgamation with mercury that had previously been the main method of extractinggoldfrom ore.

hence, option (b) is correct.

question a. what is leaching? explain the process in the extraction of metal Al from it's ore.

Enzymesare essential for healthydigestionand a healthy body. They work with other chemicals in the body, such asstomachacid and bile, to help break down food into molecules for a wide range of bodilyfunctions.

Enzymesare essential for healthydigestionand a healthy body. They work with other chemicals in the body, such asstomachacid and bile, to help break down food into molecules for a wide range of bodilyfunctions.

The functions of digestive enzymes are ptyalin converts starch (complex carbohydrates) into maltose, pepsin break down proteins into peptides and amino acids ,lipase acts on fats and forms fatty and glycerol and lastly maltase acts on maltose and forms glucose.

Digestive enzymes helps in digesting complex food materials into simpler molecules for absorption by the body. During digestion of good, different parts of the alimentary canal produces different digestive enzymes that helps in digestion of different components of food . For example , Saliva produces salivary amylase that digests the starch. Stomach contain gastric gland that produces pepsin that helps in protein digestion. Apart from that other enzymes such as trypsin , chymatrypsin also helps in protein digestion.

the answer is washing soda .it softens hard water.

Primarily, the reduction of cyanides to primary amines in the presence of sodium in ethanol is called as Mendius reaction. Na acts as a strong reducing agent for the reducing nitriles to primary amines and alcohol (ethanol) acts as a solvent in this process

Sodium is a powerful reducing agent. It wants to donate an electron to things that are electron deficient.

The mechanism of the reduction of aldehydes and ketones by sodium would be similar to that of the Bouveault-Blanc reduction. Ethanol is the source of the protons (at least early in the reaction). The dots in the reactions below signify radicals (unpaired electrons), which are represented to the best mchem and MathJax's ability (which is not great).

Step 1 - one electron transfer from sodium to carbonyl group:

Na⋅+RCH=O⟶Na++RCH⋅−O−

Step 2 - abstraction of a proton from ethanol:

CH3CH2OH+RCH⋅−O−↽−−⇀CH3CH2O−+RCH⋅−OHThis step is an equilibrium step, and is driven toward products by the second electron transfer (which consumes the RCH⋅−OH.

Step 3 - one electron transfer from a second sodium atom to the organic radical:

Na⋅+RCH⋅−OH⟶Na++RCH:−−OH

Step 4 - second proton transfer from ethanol:

CH3CH2OH+RCH:−−OH⟶CH3CH2O−+RCH2OHThis reaction, while technically an acid-base equilibrium, essentially goes to completion because of the vast disparity in acidity of C−H and O−H.

The net reaction is:2Na+RCH=O+2CH3CH2OH⟶RCH2OH+2CH3CH2ONa

i think A option is correct

yes u r right but how

its formula for calculating angular momentum bro in this chapter i think u will get how it comes when u will study rotational motion in physics

option A Is correct

yes it is correct answer

v=9.8/5 is the correct answer

9.8 m/s is the following question answer.

9.8 m/s is the best answer for this question

9.8 m/s is the correct answer

9.8 m\s is the right answer of the following

For n=4 , l= 3

so orbital angular momentum is √l(l+1)h/2π = √3*4h/2π = √3h/π

The angular momentum quantum number, l, (also referred to as the secondary quantum number orazimuthal quantum number) describes the shape of the orbital that an electron occupies. The lowest possible value of l is 0, and its highest possible value, depending on the principal quantum number, is n - 1.

The orbital angular momentum (L) = √(l (l+1)) h/2π = √6 h/2π (l = 2 for d-orbital)

(d) n0ne of these (2)h/2π = h/πThe angular momentum (mvr) of electron in nth orbit is equal to nh/2π. nh/2π gives angular momentum of electron revolving in a circular orbit as proposed by Neils Bohr. However orbital angular momentum of electron in a given orbital is calculated by using the following equation.

the angular momentum of a d orbitalsince l is equal to 3 for d orbital √l(l+1)h/2π√3(3+1)h/2π√12h/2π2√3

Hydrogen peroxideis reducingsilverfrom an oxidized state to a reduced state.

Oxygenis been removed fromsilver.

In the reaction,oxygenis formed in it's pure state andhydrogen peroxideis been oxidized to formwater.

Iron is extracted from its ore, haematite, in a blast furnace. The ore is fed into the top of the furnace along with coke and limestone. The limestone decomposes in the hot furnace, forming calcium oxide. This reacts with the sandy impurities (silicon dioxide) to form a slag.

SnO2

The oxide group, O2−, clearly has a 2− charge. For Sn(+IV), there thus must be 2 oxide groups to attain electrical neutrality.

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I) ii) iv) vi) is right answer bro

Legal Rights are of three types:

Civil Rights: Civil rights are those rights which provide opportunity to each person to lead a civilized social life. These fulfil basic needs of human life in society. Right to life, liberty and equality are civil rights. Civil rights are protected by the state.

Political Rights: Political rights are those rights by virtue of which inhabitants get a share in the political process. These allow them to take an active part in the political process. These rights include right to vote, right to get elected, right to hold public office and right to criticise and oppose the government. Political rights are really available to the people in a democratic state.

Economic Rights: Economic rights are those rights which provide economic security to the people. These empower all citizens to make proper use of their civil and political rights. The basic needs of every person are related to his food, clothing, shelter, and medical treatment. Without the fulfilment of these no person can really enjoy his civil and political rights. It is therefore essential, that every person must get the right to work, right to adequate wages, right to leisure and rest, and right to social security in case of illness, physical disability and old age.

option c flower pot is the answer

flower pot(Anaar ) should be correct

Na2O-sodium oxideAlCl-Alumniun Chloride Na2SO4-Sodium sulphideMgOH-magnesium hydroxide

The binding energy for both O2 and N2 is about the same but O2 likely has a slightly higher binding energy. Generally, binding energy increases with the number of nucleons until Iron and then decreases. Nitrogen, because it is being held together by a triple bond, while Oxygen is being held together by a double bond.

Uhu...

10%w/w solution of glucose in water means 10 g of glucose present in 100g of solution.Therefore, Mass of glucose is 10gMass of water is = 100g- 10g = 90 g = 0.09 kgAnd density = 1.2gmL-1Let us find molalityMolality = Number of moles of solute / Mass of solvent in KgNumber of moles of solute = Mass of glucose / Molar mass of glucoseMolar mass of glucose (C6H12O6)= 6x12 + 12x1 + 6x16=180 g /molNumber of moles of glucose = 10/180 = 0.0556 molesMolality = 0.0556/0.09 =16.7MNow find the molarity ,Molarity = Number of moles of solute / Volume of solution in literDensity = 1.2 g/mlVolume = mass / density= 100 g / 1.2 g/ ml = 83.33 ml = 0.0833 LMolarity = 0.0556/ 0.0833=0.67 M

thx

molarity is no. of moles per litre of solution.

here mass of NaOH = 4g so, moles will be 4/40 = 0.1

volume of solution is 250ml = 0.25L

so, molarity = 0.1/0.25 = 0.4M

thank u so much