InterviewSolution
Saved Bookmarks
InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your Class 11 knowledge and support exam preparation. Choose a topic below to get started.
| 1351. |
Derive the relation between Ka and Kb. |
| Answer» Welcome ???<br>Thnk u??<br>Looks like??<br>My answer is correct or not<br>The Ka is the acid dissociation constant of a weak acid, and the Kb is the dissociation constant of its conjugate base. Alternatively, we can also say, Kb is the base dissociation constant of a weak base, and Ka is the dissociation constant of its conjugate acid.We can deduce the same relationship, i.e. Ka⋅Kb=Kw, for these cases also. Without loss of generality, let the weak acid be HA and its conjugate base is A− (you can also do the same [not identical] derivation considering base B and its conjugate acid BH+).Considering acid dissociation,HA↽−−⇀H++A−Ka=[H+][A−][HA],and for the basic action of its conjugate base, consider,A−+H2O↽−−⇀HA+OH−Kb=[HA][OH−][A−].Multiplying both the equations, we will have,Ka⋅Kb=[A−][H+][HA]⋅[HA][OH−][A−]=[H+][OH−]=KwSo, it is proved that for any acid/conjugate base pair (or, base/conjugate acid pair) the identical relation, Ka⋅Kb=Kw holds. Hope this answer will help u?????? | |
| 1352. |
State and explain Le-Chatleier principle. |
| Answer» Thanku Ankit??<br>Le Charleier principle, also called Châtelier\'s principle or "The Equilibrium Law", can be used to predict the effect of a change in conditions on some chemical equilibria. The principle is named after Henry Louis Le Châtelier and sometimes Karl Ferdinand Braun who discovered it independently.<br>Le Chatelier\'s principle is an observation about chemical equilibria of reactions. It states that changes in the temperature, pressure, volume, or concentration of a system will result in predictable and opposing changes in the system in order to achieve a new equilibrium state. | |
| 1353. |
What happens when a salt bridge is not present |
| Answer» The purpose of a salt bridge is not to move electrons from the electrolyte, rather to maintain charge balance because the electrons are moving from one half cell to the other.Without the salt bridge, the solution in the anode compartment would become positively charged and the solution in the cathode compartment would become negatively charged,because of the charge imbalance,the electrode reaction would quickly come to a halt,therefore It helps to maintain the flow of electrons from the oxidation half cell to a reduction half cell.<br>Without the salt bridge, the solution in the anode compartment would become positively charged and the solution in the cathode compartment would become negatively charged, because of the charge imbalance, | |
| 1354. |
How to balance redox reactions by oxidation no method |
| Answer» Its tough to make u underatand this topic by texting.its better to take help from ur teacher or youtube videos.this will make u understand balancing reactions<br>U can see in this app also<br>Step 1: Assign oxidation numbers to each of the atoms in the equation and write the numbers above the atom.Step 2: Identify the atoms that are oxidized and those that are reduced. ...Step 3: Use a line to connect the atoms that are undergoing a change in oxidation number.<br>U can view the videos of physics wallah on you tube...??✌️✌️ | |
| 1355. |
Where can i get periodic test 2 sample papers of all subs class 11?? |
| Answer» Full portion questions papers are available but periodic test 2 i dont think so it is there. U can practice all important questions of subjects it is v.important and most of the sample papers contain those questions | |
| 1356. |
Calculate the enthalpy of combustion of Ethylene at 298 Kelvin |
| Answer» | |
| 1357. |
Explain dynamic equilibrium?? |
| Answer» dynamic equilibrium exists once a reversible reaction ceases to change its ratio of reactants/products, but substances move between the chemicals at an equal rate, meaning there is no net change. It is a particular example of a system in a steady state.<br>In chemistry, a dynamic equilibrium exists once a reversible reaction ceases to change its ratio of reactants/products, but substances move between the chemicals at an equal rate, meaning there is no net change. It is a particular example of a system in a steady state.<br>An equilibrium in which two reversible reactions occur at the same rate | |
| 1358. |
Which have more surface tension soaps or water |
| Answer» Water has more surface tension as comparison to the soap.? | |
| 1359. |
Define pH. What is its value for neutral water at 25 degree Celcius? |
| Answer» What!!!!!!!Is it presence of hydrogen...omg??<br>Hp means presense of hydrogen<br>hyy<br>pH is a measure of hydrogen ion concentration, a measure of the acidity or alkalinity of a solution. The pH scale usually ranges from 0 to 14. Aqueous solutions at 25°C with a pH less than 7 are acidic, while those with a pH greater than 7 are basic or alkaline. A pH level of 7.0 at 25°C is defined as "neutral" because the concentration of H3O+ equals the concentration of OH− in pure water. Very strong acids might have a negative pH, while very strong bases might have a pH greater than 14. | |
| 1360. |
What is the importance of ultra-pure elemental silicon? How is it obtained? |
| Answer» | |
| 1361. |
The salt of strong acid and strong base does not undergo hydrolysis.Comment. |
| Answer» Ur welcome<br>Thanks<br>In this case neither cation nor anion undergo hydrolysis. Therefore the solution remains neutral. For example in the aqueous solution of NACL its ions Na+and Cl- have no tendency to react with the H+ or OH- ions of water.this is because the possible products of such reaction are NaOH and HCL which are themselves completely dissociated. As a result.,there is no change in the concentration of H+ and OH- ions and hence the solution continues to remains neutral | |
| 1362. |
(CH)3N is basic but (CF3)3N is not basic.Explain. |
| Answer» Thank u<br>Fluorine is more electronegative than hydrogen is. It polarises the covalent bond that forms between it and the carbon atom in (CF3)3N. | |
| 1363. |
Potassium carbonate cannot be prepared by Solvay process.Why. |
| Answer» Thanks ishita sunn ke aacha laga<br>Of course ur answers r always helping me???<br>Hope this answer help u<br>Solvay process cannot be used to prepare potassium carbonate. This is because unlike sodium bicarbonate, potassium bicarbonate is fairly soluble in water and does not precipitate out.<br>As K2CO3 is to soluble which can not be precipitated out | |
| 1364. |
Why fqlling liquid drops are spherical? |
| Answer» Every body on earth surface aquire min. Surface area and we know that the sphere has min. Surface area<br>It is due to surface tension<br>Welcome<br>Thnk u for ur answers<br>Falling drop of a liquid is always spherical in shape due to surface tension. The inward forces on the surface molecules of the liquid droplet tend to cause the surface to volume ratio as small as possible.<br>Due to surface tension . Surface tension is a property of liquid by which surface molecules of a liquid tries to hold the molecules together by acquiring minimum Surfacr area in acting like a stretched membrane | |
| 1365. |
What does the equilibrium constant K less than 1 indicates? |
| Answer» Equilibrium shifted towards forward<br>Your wellcome<br>Thnk u<br>. If K is larger than 1, the mixture contains mostly products. If K is less than 1, the mixture contains mostly reactants. | |
| 1366. |
What is absorption chromatography? |
| Answer» Adsorption chromatography: In the process of adsorption chromatography, different compounds are adsorbed on the adsorbent to different degrees based on the absorptivity of the component. Here also, a mobile phase is made to move over a stationary phase, thus carrying the components with higher absorptivity to a lower distance than that with lower absorptivity. | |
| 1367. |
What is the use of a frationating column? |
| Answer» Fractionation Column is basically a diffrentated chamber that have different range of temperature i.e different boiling points, in case of separation of petroleum mixture temperature goes on increasing from top to bottom of the column.Thus, In fractional distillation , that component separates first which have least boiling point and finally that component having highest boiling point.The Fractionating Column use for the Separation of Fatty Acids. | |
| 1368. |
Who is cbse chairman? |
| Answer» ????<br>Anita karwal IAS....<br>Anita Karwal<br>Why are u asking????<br>I think anita karwal<br>Is it Mr vineet joshi | |
| 1369. |
Define the Nucleophiles? |
| Answer» Species which are attract towards electron dificient species are called nucleophiles.<br>No ishita ??<br>Hlo jasmine ur class incharge is Mr. Gagandeep Garg....m i right....??? | |
| 1370. |
Iupac naming of 2-ethyl-but-1-ene obtain by ozonolysis |
| Answer» ?? | |
| 1371. |
A cylinder of cooking gas is assumed to contain 11.2kg |
| Answer» Yes ??????<br>2 things-1) Actually it contains 14 kg of LPG.2) What is your question btw❓❓❓??? | |
| 1372. |
How to find the charge of an element from the compound? |
| Answer» This is known as oxidation number which you are asking<br>From its valency<br>I think u are asking for oxidation no. Am i right???<br>?no idea | |
| 1373. |
Electron filling of fluorine molecule? |
| Answer» Guys can\'t u understand.it is the question from molecular orbital theory concept..<br>[He]2s^2 2p^5<br>Actually I asked of molecule not atom...<br>2,7 | |
| 1374. |
Easy Define of Inert pair effect.... |
| Answer» The non participation of ns electron in bonding | |
| 1375. |
Explain Nucleophilic with examples? |
| Answer» Wlcm......???<br>Thanks<br>Nucleophiles are electron rich species.either -vely charged or neutral molecules having lone pair electrons.....example...OH- , CN- | |
| 1376. |
What is Grahams law of diffusion ?? Please explain simple form |
| Answer» Ur wlcm?<br>Thanks Priya ???<br>the rates of effusion of two gases are inversely proportional to the square roots of their molar masses at the same temperature and pressure<br>r divided by R= square root of T÷t<br>Please give the answer | |
| 1377. |
What is group oxidation state? I want its definition. |
| Answer» Thanks ?<br>The general valence shell electronic configuration of p-block elements is ns2\xa0np1-6\xa0where n=2-6.The highest oxidation state of the elements of p-block is numerically equal to group number minus 10 or number of valence electrons. This highest oxidation state exhibited by all the elements in a particular group is known as group oxidation state. For example , For 13 group , Group number =13Highest oxidation state=13-10=+3Therefore, group 13 elements have +3 group oxidation state. | |
| 1378. |
Why co2 is a gas and sio2 is solid |
| Answer» As carbon and silicon are of same group, but carbon comes first and silicon second. As we know when we goes down a group , size of the elements increases , so they prefer to make sigma bond rather than pie bond. So carbon makes pie bond with oxygen and as we all know pie bonds are weak so co2 is a gas. But in case of SiO2 it makes sigma bond with oxygen and due to strong bond SiO2 is solid .For more clearance please the structure of SiO2 in ncert 2nd textbook , chapter p block.<br>It is all due to vander wall forces. The CO2 has less intermolecular forces. The sio2 has strong intermolecular forces or vander wall forces due to which it binds its molecules or atoms. So therefore sio2 is solid | |
| 1379. |
define normality? and write the formula |
| Answer» Normality indicates the concentration of the solution. Normality definition is the weight of solute dissolved in a liter of solution. Normality of a solution can be calculated when atomic mass and volume are known. If the composition of solute and solvent are same, the solution is saturated.Normality formula is given by, Normality Formula Multiplying molarity can consider favorable normality calculation by the number of equivalents. Normality (N) = Molarity (M) x number of equivalentsExample 1Determine the normality of 0.1381 mol of NaOH, which is dissolved in 300 mL.Solution- Equivalent solute = 0.1381mol x 1 eq/molSolution = 300mL = 0.300LNormality = 0.1381 x 1 eq/mol 0.300 LTherefore Normality = 0.460 NExample 2- Determine the normality of 0.248mol of H2SO4, which is dissolved in 250mL of solution.SolutionEquivalent solute = 0.248mol x 2eq/molSolution = 250 mL = 0.250LNormality = 0.248mol x 2 eq /mol 0.250LTherefore Normality = 1.984 N<br>Normility : the no. of mole equivalent per litre volumeN = n- factor ×M(molarity) | |
| 1380. |
what is Leechartis principle?explain with example |
| Answer» | |
| 1381. |
Mention the factors on which vapour pressure of a pure liquid depends |
| Answer» The pressure exerted by the vapours of any liquid is called its vapour pressure.Suppose a beaker is partially filled with any liquid. Then the molecules of that liquid at its surface will start evaporating on their own even without heating. This happens because the molecules at surface behave differently than those in the bulk. Now these molecules get converted into vapours which exert some pressure on the walls of the beaker, which is the vapour pressure of that liquid.Vapour pressure of any liquid depends upon the following factors:(i) Temperature: As the temperature of the liquid is raised, more molecules get evaporated and thus exert more pressure. So vapour pressure will increase.(ii) Intermolecular forces: If the intermolecular attractions between the molecules of liquid are stronger, then its vapour pressure would be low as it would be difficult to convert that liquid into vapours.(iii) Addition of solute: Addition of solute raises the boiling point of any liquid, i.e. its will boil at a higher temperature. Thus it will lower the vapour pressure of that liquid. | |
| 1382. |
Explain the meaning of 4d*6 |
| Answer» The 4d is denoted that the element in 4th shell and d-subshell and 6 denotes that d-subshell contains 6 electrons | |
| 1383. |
Why hydrogen show isotopic effect? |
| Answer» Isotopic effect or isotope effect is the difference in properties of same element due to different atomic masses. For ex: the three isotopes of hydrogen protium, deuterium and tritium have same atomic (no. 1) but they have different no. of neutrons which change their masses and so their chemical properties remain same but the other properties like rate of equilibrium constants differ in the three. | |
| 1384. |
What is hydride and hydride gaps. |
| Answer» | |
| 1385. |
What is autoprotolysis of water and ampotheric nature of water? |
| Answer» | |
| 1386. |
What is "BRONSTED LOWRY ACID AND BASE "????? |
| Answer» Thanks<br>according to him acid is a substance that is a capable of donating a hydrogen ion H+ and it is known as proton donors . and base are substances capable of accepting hydrogen ion,H+ and it is known as proton acceptors<br>Accirding to Brønsted–Lowry theory acids are defined as substances that dissociate in aqueous solution to give H+ (hydrogen ions), bases are defined as substances that dissociate in aqueous solution to give OH− (hydroxide ions).<br>Acids are protons h + Deonar while bases bases are accepter | |
| 1387. |
The vapour density of a gas is 11.2 .The volume occupied by 11.2g of this gas at NTP will be |
| Answer» 760mm | |
| 1388. |
Can you describe hyper conjugation with examples? |
| Answer» | |
| 1389. |
Is there any tricks to identify the salt in salt analysis? |
| Answer» Sorry there is no trick. I know that its tough to learn in one go but if u try to learn one topic a day like flame test, acid radical test, basic radical test etc u will be satisfied with your result . I too find it difficult but today i had made it.Good luck for your practical?? | |
| 1390. |
Vespers |
| Answer» | |
| 1391. |
What is the basic principle of chromatography? |
| Answer» ????<br>Your welcome ishita<br>Thnk u Ankit.....<br>It is defined as the process of separation of the individual components of a mixture based on their relative affinities towards stationary and mobile phases. Principle: The samples are subjected to flow by mobile liquid onto or through the stable stationary phase.<br>Thnks yogita<br>Chromatography: (Tswett 1906) is a general term which involves processes by which is a mixture of different substances can be:(a) separated, (b) purified and (c) identified. Originally this technique was employed to separate coloured components from their mixture in the form of distinct zones as rings called Chromatograms. Now it is used for the separation and purification of coloured as well as colourless substances.Principle: The technique of chromatography is based on the fact that different constituents of a mixture are adsorbed to different extents by given adsorbent. The medium which carries the mixture of example solvent (such as ether, benzene, alcohol etc.) is called a moving phase and the medium in which various components are adsorbed (such as alumina, silica gel etc.) is called the stationary phase.The important types of chromatography are:(i) Column chromatography(ii) TLC or thin layer chromatography(iii) Gas chromatography(iv) Paper chromatography. | |
| 1392. |
Co + H2 gives out what ? at presence of cobalt catalist. |
| Answer» Co+2h2=ch3oh. Catalyst will only increase the speed of reaction | |
| 1393. |
State de broglie\'s principle |
| Answer» lamda=h÷p where h=plank constant ,p=linear momentum and lamda=wavelenth<br>According to de Broglie electron is considered as wave and thus circular orbit where electron revolving should contain wavelength as a whole number.So the circumference (C) of this circle in terms of radius can be written as,C = 2πrAnd whole number of wavelengths (nλ) should be equal to this circumferenceThus, 2πr\xa0= nλ | |
| 1394. |
What is Fazan\'s rule? |
| Answer» formulated by Kazimierz Fajans in 1923, are used to predict whether a chemical bond will be covalent or ionic, and depend on the charge on the cation and the relative sizes of the cation and anion. | |
| 1395. |
Why KO2 is paramagnetic? |
| Answer» Because due to presence of unpaired pie*2p orbital in O2 molecular orbital. | |
| 1396. |
please explain 2nd law of thermodynamics explain what is spontainity ? |
| Answer» Heat can be transform from one form another form | |
| 1397. |
explain equilibrium constant?where it is used |
| Answer» The equilibrium constant is a ratio of the concentration of the products to the concentration of the reactants. If the K value is less than one the reaction will move to the left and if the K value is greater than one the reaction will move to the right. | |
| 1398. |
What is order of ionisation enthalpy in 1st group in periodic table ? |
| Answer» | |
| 1399. |
Simple form to solve paradox method ... ?? |
| Answer» | |
| 1400. |
What is the discovery of chemistry |
| Answer» | |