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.
| 1201. |
why the potential energy decreases as two atoms approach each other |
| Answer» ???<br>The strong attraction of each shared electron to both nuclei stabilizes the system and the P.E decreases as the bond distance decrease. | |
| 1202. |
Difference between 6 Bond and Alpha Bond |
| Answer» | |
| 1203. |
Which substance is responsible for green house effect. Answer fast plzz?? |
| Answer» Ozone co2 and polluted vapours<br>Green house gases are responsible for green house effect. Some of the green house gases are water vapour ,methane, carbon dioxide, ozone, nitrous oxide, etc. | |
| 1204. |
Explain standard electrode potential with the help of SHE? |
| Answer» | |
| 1205. |
Notes of some important compound of calcium chapter S-block |
| Answer» Read a s block elements and physical and chemical properties and equations<br>See in this app!! | |
| 1206. |
What is enthalpy |
| Answer» Good defination yakshi in 1 line<br>U can say enthalpy is a kind of energy in mininmum quantity i.e. 1 mole.<br>Enthalpy, the sum of the internal energy and the product of the pressure and volume of a thermodynamic system. ... If the only work done is a change of volume at constant pressure, the enthalpy change is exactly equal to the heat transferred to the system.<br>a thermodynamic quantity equivalent to the total heat content of a system. It is equal to the internal energy of the system plus the product of pressure and volume.the change in enthalpy associated with a particular chemical process."most compounds have negative enthalpies of formation" | |
| 1207. |
Why there are so many lines in hydrogen spectrum? |
| Answer» A hydrogen atom has only one electron it contains a large number of shells so when this single electron jumps from one shell to another,a photon is emitted,and the energy difference of the shells causes different wavelengths to be released. Hence mono-electric hydrogen has many spectrum lines.Transitions of electron in the hydrogen atom are 1.LYMAN series.2.Balmer.3.Paschen.4.Bracket.5.Pfund.6.Humphire series.<br>Hydrogen atom has one electron present in the first shell. When energy is given to the atom the electron gets excited and moves to a higher orbit. Excited states are unstable and quickly decay to the ground state i.e. the electron moves back to the first shell. This movement can either be in one step or a series of steps. The electron emits energy of a certain frequency when it falls from one energy level to another and for each movement it emits electromagnetic radiation of a certain frequency giving rise to a series of spectral lines each corresponding to the fall of excited electrons from one orbit to another. The spectral lines are divided into series depending on the shell the excited electron falls back to e.g. electrons that fall to the first shell from any of the higher shell, the spectral lines are called Lyman series. Balmer is the name for all lines where electrons move to shell 2 from higher orbits. | |
| 1208. |
Why group 2 elements of periodic table is known as alkali earth metal? |
| Answer» Group 2 elements these are found earth crust<br>The hydroxides and oxides of group 2 are alkaline in nature and these metal oxides are found in earths crust..and hence known as alkali earth metals.. | |
| 1209. |
Reaction of propene with hydrogen cyanide |
| Answer» | |
| 1210. |
What is meant by resonance in molecules? |
| Answer» Resonance structures are two forms of a molecule where the chemical connectivity is the same but the electrons are distributed differently around the structure. Resonance occurs when electrons can flow through neighboring pi systems. An important example of resonance is found in the bonding of benzene, a planar six-membered ring with alternating double and single bonds (three of each). Two distinct pictures can be drawn, and the true structure of the molecule is a mixture of the two resonance structures. Having multiple valid resonance structures makes a molecule more energetically stable. Resonance helps to explain structure and reactivity of organic molecules. | |
| 1211. |
What do you mean by 15 volume h2o2 sol |
| Answer» Means it\'ll liberate 150 ml of H2O2 at STP cond.Generally (x vol. & Y lit of H2O2 liberates xy lits of O2 Ex: 20V &20 ml of H2O2 gives 400 ml of O2 at STP.I hope u got it Nidhi. | |
| 1212. |
Resonance structure of fluro benzene |
| Answer» | |
| 1213. |
What is electron deficient and inert pair effect? |
| Answer» Nice explain yakshi<br>Hpe u will read and it will become easy for u to understand the concept<br>As we know that the meaning of inert is unreactive....similarly inert pair(of 2 electrons) effect can be defined as the tendency of pair of electrons in outermost or valence shell to remain unshared or unionised i.e remain unreactive<br>Actually these are two different terms......."ELECTRON DEFICIENT molecule or species is definded as a molecule or species that does not have enough valence electrons to complete their octet and that\'s why they are very unstable and have tendency to accept a pair of elecron to achieve stable electronic configuration and behave as lewis acid....." for example ...BeCl2 and BCl3 | |
| 1214. |
Formula of Borax?? |
| Answer» Na2[B4O5(OH)4]·8H2O hope this will help u<br>Na2[B4O5(OH)4]·8H2O | |
| 1215. |
Why liquid diffuse slowly as compared to the gas |
| Answer» Bcoz liquid molecules are more closely packed than that of the gases<br>Because the particles in liquid are tightly packed than in gas... Gas have loosen particles helps is faster diffusion | |
| 1216. |
What is half redox reaction |
| Answer» | |
| 1217. |
Why hydrogen is both metal or non metal |
| Answer» Yes answer is nice<br>Thanks yakshi....I thought, If I m not conformed then there is no reason to give big explaination.............by the way nice answer<br>Yet hydrogen has no fixed place ?<br>It is non metal based on its physical property....as in group 1 (alkali) all elements have 1 electron in their outermost valence shell and hydrogen also does.......while based on chemical properties it can also react with.....non metals and form covalent as well as ionic compounds.....<br>No aman ur answer is absolutely correct.....but u did not explain it<br>Bcoz it shows behaviour of both metals and non metals i.e. it can be placed in grp 1 as well as in grp 17<br>Becoz Hydrogen can be placed in group 1 also as well as group 17 also.... If wrong then surely tell me.... | |
| 1218. |
Explain inductive effect with examples |
| Answer» The generation of polarity c-c non polar bond due to attached any group which is either more nelectronegative than c are known as inductive effect Feature:- * It is parmanent effect. * It arises due to electronegative difference. * This effect decreases with distance and nearby dies of after 3 or 4 carbon atom. * Inductive effect is due to partial shifting of electrons and not due to complete transfer of electrons<br><pre>\xa0</pre>Partial Transference of Electrons is called Inductive Effect. It usually occurs due to difference in Electronegativity of bonded atoms.For example:\tIn CH3Cl, Cl is more electonegative.\tSo, Cl will attract electrons towards it.\tHere, -I effect is working.\t-I effect increases the acidity while +I effect decreses the acidity.\tSimultaneously, -I effect decreases the basicity while +I effect increases the basicity. | |
| 1219. |
Why is boric acid considered as a weak acid?? |
| Answer» Oookkkk ....nice yr....nice ques.and answer.??<br>Because it is not able to release H+ ions on its own. It receives oH- ions from water molecules to complete its octet and in turn releases H+ ions. It is solved question from ncert q11.4<br>Boric acid is considered as a weak acid as it contains lower concentration of hydrogen atoms as compared to other acids with equal concentration of water .Plus is shows lower acidity number on a P.H. scale (7-10). Because it is not able to release H+ ions on its own. | |
| 1220. |
Acidic radical \' reaction |
| Answer» ?https://tse1.mm.bing.net/th?id=OGC.e46a42d68b80838dac8b3c504d6aac68&pid=Api&rurl=https%3a%2f%2fmedia.giphy.com%2fmedia%2fHld9vKjLk3irC%2fgiphy.gif&ehk=M2LOyINfUnub03J0nTb2Mw | |
| 1221. |
Why white fumes could be observed around the bottle of HCl solution? |
| Answer» It is solved question in ncert only..... pls refer those questions also it is important for ur exams.. aluminium chloride combines with air (hydrogen) forms hcl gas that is why white fumes appear around bottle<br>White fumes is due to the presence of HCl gas.Anhydrous aluminium chloride is hydrolysed partly with the moisture in the atmosphere to give HCl gas. This HCl combines with the moisture in the air appears white in colour.AlCl3 +3H2O → Al(OH)3 +3HCl(white fume) | |
| 1222. |
Why surface area increases down the group?? |
| Answer» Because increase in sizeAnd we know that size is directly proportional to surface area | |
| 1223. |
How to make chlorophenylmethane |
| Answer» | |
| 1224. |
explain optical activity of lactic acid? |
| Answer» | |
| 1225. |
explain wrutz reaction |
| Answer» Wurtz Reaction : When an alkyl halide is treated with metallic sodium in presence of dry ethyl ether , a symmetrical alkane is formed.Example : CH3CH2Cl+2Na+CH3CH2Cl➡CH3CH2CH2CH3+2NaCl | |
| 1226. |
Whatis inert pair effect |
| Answer» Hlo kaira<br>H r u<br>Your most welcome sir<br>The reluctance of (S)orbital to contribute in the bond formation is called inert pair effect It will work when (N) is greater than equal than 4 | |
| 1227. |
Define Inductive effect ? |
| Answer» Welcome??<br>Thanks ??<br>Hope this helps??<br>Polarization of bond when a more or less electronegative atom or group bonded with carbon chain is called Inductive effect...........It is permanent effect..........Inductive effect decreases with increase in distance...It is of two types 1) + i effect and 2) - i effect.............<br>The inductive effect is the effect on electron density in one portion of a molecule caused by electron-withdrawing or electron-donating groups elsewhere in the molecule.It usually occurs due to difference in Electronegativity of bonded atoms.For example:\tIn CH3Cl, Cl is more electonegative.\tSo, Cl will attract electrons towards it.\xa0<br>Pta nhi | |
| 1228. |
What does the symbol (R) represent ? |
| Answer» rsn alkyl group it can be replaced by hydrogen or any of the alkyl group like alcohol cause weak acids ketone group or any other groups each other<br>Any alkyl group | |
| 1229. |
Quick lime mixed with caustic soda gives soda lime. What\'s the Formula of soda lime? |
| Answer» It is the mixture of calcium hydroxide and sodium orpotassium hydroxide, both corrosive materials. It is noncombustible and soluble in water with release of heat. It is corrosive to metals and tissue. It is the mixture of lime hydrate and atomic number 11 or potash, each corrosive materials.Formula of soda lime = \u200eCaHNaO2 | |
| 1230. |
projects on chemistry topics |
| Answer» kjeldahl\'s method is the best project work | |
| 1231. |
Important question for ch1 |
| Answer» Ncert and solved examples is v. Important. Just practice that it is more than enough | |
| 1232. |
Why is CO considered poisnous ? |
| Answer» And at last person die due to suffocation............In Addition to Priya\'s Answer.....<br>It binds to haemoglobin to form carboxyhaemoglobin.which is 300 timrs more stable than the oxygen haemoglobin complex. The capacity of oxygen is reduced in blood. This leads to nervesness,headache,weakness,cardivascular disorder......and many more<br>Carbon monoxide (CO) is considered to be more toxic or hazardous than Carbon Dioxide (CO2) due to the fact that CO reacts with the hemoglobin in our blood streams and produces a stable compound that actually prevents oxygen from entering the body. However, CO2 is more tolerable in a human body because we are able to exhale it. And it doesn\'t have the same chemical properties that CO has. CO2 doesn\'t react with the hemoglobin in our blood streams. To be more specific there is a reaction between CO and the hemoglobin in our body that occurs while on the other hand the CO2 doesn\'t. Basically, the hemoglobin is an oxygen binding protein, and CO is more ready to share it\'s oxygen atom with the hemoglobin than the CO2. read less | |
| 1233. |
pH is the intensive or extensive property? |
| Answer» Extensive property<br>Intensive property | |
| 1234. |
Why is aryl group have only C6H5- |
| Answer» an aromatic hydrocarbon by the removal of a hydrogen atom, as phenyl, C 6 H 5 −, from benzene, C 6 H 6 ."Aryl" is used for the sake of abbreviation or generalization, and "Ar" is used as a placeholder for the aryl group in chemical structure diagrams. A simple aryl group is phenyl, C6H5; it is derived from benzene. | |
| 1235. |
Markovnikovs rule |
| Answer» the addition of a protic acid HX to an asymmetric alkene, the acid hydrogen (H) gets attached to the carbon with more hydrogen substituents, and the halide (X) group gets attached to the carbon with more alkyl substituents. | |
| 1236. |
AlF3 is ionic while AlCl3 is covalent why |
| Answer» Fajans rule applies here<br>Gand mra lo<br>So the halogen decides the ionic and the covalent character. Since flourine has smaller size than chlorine so it does not polarises the bond but chlorine has larger size, it polarises the bond. And we know that as polarity increases in a compund, its covalent character increases.<br>What is something mentioned in the first line of the poem what does it whispered to the birds | |
| 1237. |
Vander wall force |
| Answer» The interaction between atom and molecules which depends on distance is called vander wall force | |
| 1238. |
What is aluminium write its ore? |
| Answer» Aluminium is the most abundant metal in the earth’s crust. Aluminium does not occur free in nature, but its compounds are numerous and widely distributed.\tName of OreFormula of OreBauxiteAl2O3 × 2H2OCryolite\xa0Na3AlF6Feldspar\xa0K2Oal2O3×6SiO2 or KalSi3O8Mica\xa0K2O×3Al2O3×6SiO2×2H2OCorundumAl2O3\t | |
| 1239. |
Give structures, chemical properties of Heavy water and hydrogen peroxide |
| Answer» A peroxide is any compound which has two oxygen atoms bonded together. The O-O group is the peroxide group of the compound. And Hydrogen Peroxide is the simplest peroxide. The chemical formula for hydrogen peroxide is H2O2. It is a water molecule with one extra atom of oxygen,.Properties of Hydrogen Peroxide\tHydrogen Peroxide is an almost clear, pale blue liquid in its pure state\tIt has an odour similar to that of nitric acid\tHydrogen peroxide has a viscosity higher than water. It is about 40% denser than water\tIt is acidic in nature.Heavy water or deuterium oxide (D2O) is a form of water that contains a large amount of the hydrogen isotope deuterium which is also known as heavy hydrogen.1)It is colourless, odourless and tasteless mobile liquid heavier than water. Because of higher molecular mass there is a marked difference in physical properties of ordinary water and heavy water.2)Dielectric constant of heavy water is lower than that of ordinary water therefore ionic compounds are less soluble in heavy water than in ordinary water. | |
| 1240. |
Formula of acetone?? |
| Answer» C3H6o<br>C3H6O | |
| 1241. |
Is Cyclooctatetraene Aromatic or Anti aromatic |
| Answer» As cyclooctatetraene not planar so it is described as non aromatic. | |
| 1242. |
State Heisenberg UnvcerTainty principle.how does it contradict bohr\'s model of atom |
| Answer» The Heisenberg Uncertainty Principle discredits the aspect of the Bohr atom model that an electron is constrained to a one-dimensional orbit of a fixed radius around the nucleus. ... It simply states that a particle behaves both as a wave and a particle and therefore cannot have both a definite momentum and position. | |
| 1243. |
Methane cannot be prepared by Kolbe\'s electrolytic method. Why? |
| Answer» In kolbe process reaction R-R forms as a product so methane can not be formed by these methods. | |
| 1244. |
Why nitrogen is highly reactive? |
| Answer» Nitrogen is low reactive. If it is highly reactive than our ozone layer would be completely depleted<br>Due to small size and more electronegative character of nitrogen, there is p(pi) - p(pi) interaction between the two atoms and all the electrons in the valance shell are involved in the triple bond. Due to this strong triple bond formation, bond enthalpy of nitrogen is very high. Thus, Nitrogen gas has low reactivity.<br>It has triple bond to form N2 so if it was reactive then it could react with other gases and depleted our ozone layer. | |
| 1245. |
Isolated gaseous atom |
| Answer» It is used ,when energy is giving to take an electron or electron enter to the shell if it not isolated we have to give more energy or less energy to evolve that electron And thus affect our calculation So term isolated gaseous atom in it ground state is used<br>Your wellcome.<br>Thanks✌✌<br>the term \'isolated gaseous atom\' is used in the definition of ionization enthalpy. Ground state of an atom refers to the most stable state of an atom. If an isolated gaseous atom is in its ground state, then less amount energy would be required to remove an electron from it.<br>An isolated atom is an atom with the same number of electron as protons yeilding a net charge of 0. The properties of an atom in isolation is different from that of individual atoms in relatively close proximity to each other. ... Thus, atoms are almost always found associated in some way with other atoms. | |
| 1246. |
Iso-electronic species defination |
| Answer» Species (atoms or ions) with same number of electrons are called iso-electronic species.Number of electrons in Cl⁻ = 17+1 = 18 \tAtom\xa0Atomic number Ion\xa0Number of electrons\xa0 Sulphur\xa0 16\xa0 S⁻²\xa0 16 + 2 = 18 Potassium\xa0 19\xa0 K⁺¹\xa0 19 - 1 = 18\t | |
| 1247. |
Why 1 litre of hydrogen peroxide gives 10 litre of oxygen??? |
| Answer» | |
| 1248. |
Chapter hydrogen question 15 is wrong |
| Answer» | |
| 1249. |
How can we define electronegetivity in periodic table |
| Answer» The positively charged protons in the nucleus attract the negatively charged electrons. As the number of protons in the nucleus increases, the electronegativity or attraction will increase. Therefore electronegativity increases from left to right in a row in the periodic table | |
| 1250. |
the correct IUPAC name of 2-iso-butylbutanamide is |
| Answer» I can\'t draw the structure<br>N-(2-methylpropyl)butanamide i know the structure but .........<br>Ab hum kya kar sakte hai....?<br>i also dont know the answer<br>But u only tell without any structure how can anyone say that the name is correct or not...sooooo.....<br>Is it not correct? | |