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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.
| 1251. |
Find out tha oxidation state of Fe2O3 and [Ti(H2O)6] |
| Answer» | |
| 1252. |
anyone who help me organic chemistry |
| Answer» Nancy what is the question<br>Yes please telll<br>there are some structure how i upload here it if jee based question<br>Yah...tell but I know that I m not good in organic than u | |
| 1253. |
Ionic bond of MgO |
| Answer» | |
| 1254. |
Noble gas have positive electron gain enthalpy.justify |
| Answer» It is because noble gases like He, Ne, etc. have a stable electronic configuration. So it is not possible for it to gain any electron. Hence it is having positive electron gain enthalpy. | |
| 1255. |
Whats is the difference between +r effects and - r effects |
| Answer» Thanks pragati...for nice answer<br>In -R (-Resonance effect) the electron pair transfers to function group or atom .e.g. -Nitrobenzen .In +R (+Resonance effect) e- pair transfer from functional group which can delocalised e- (s).e.g. -phenol<br>What is r -effect???? I studied about I-effect, E-effect,M-effect,H-effect ......but what about r-effect... | |
| 1256. |
organic reactions |
| Answer» Organic reactions are chemical reactions involving organic compounds. The basic organic chemistry reaction types are addition reactions, elimination reactions, substitution reactions, pericyclic reactions, rearrangement reactions, photochemical reactions and redox reactions. | |
| 1257. |
What is halides ? |
| Answer» When s block element are react with halogen form halide<br>Answer:Halides are anions of the Group 17 elements, Halides are compounds of Halogens. They consist of a Halogen anion, also called a halide ion and a cation. | |
| 1258. |
Why oxidation no of O2F2 is +1 ...why it\'s not +2 |
| Answer» Define it na ...<br>Because peroxide case | |
| 1259. |
Find the pH if 10cc 0.1M H2SO4 reacts with 0.1M KOH |
| Answer» put in the formula ph=-log(v2/v1) | |
| 1260. |
Is boric acid a protic acid??? |
| Answer» A protic acid is one which can ionise in solution to produce proton or hydronium ion. It is not protic acids since it does not ionise in H2O to give a proton.Boric acid is not a protic acid. It accepts a pair of electron from OH- ion of water and acts as a lewis acidB(OH)3 +2H20 →[B(OH)4]-+H3O+<br>According to their theories , a protonic acid is a species which donate a proton i.e. ... But boric acid do not donate H+ rather it accepts an electron pair from the solution or the donor i.e. an OH-. | |
| 1261. |
How can you explain higher stability of Bcl3 as compared to TLcl3?? |
| Answer» Because both boron and chlorine are of small size and also of comparable size with each other , hence due to almost comparable size bond formed is more stable , as compared to bond foed between Thallium and chlorine where size/radius difference is more, hence in case of thallium weaker bond is formeand less stable.<br>bcl3 is stable while ticl3 is unstable . Boron and thallium belong to group 13 of the periodic table. In this group, the +1 oxidation state becomes more stable on moving down the group. BCl 3 is more stable than TlCl 3 because the +3 oxidation state of B is more stable than the +3 oxidation state of Tl. Please confirm that my answer is correct ....... | |
| 1262. |
Name the constituents of water gas?? |
| Answer» Water gas is produced from synthesis gas, which is composed of carbon monoxide and hydrogen. Syngas is a useful product, but requires careful handling due to its flammability and the risk of carbon monoxide poisoning. The water-gas shift reaction can be used to reduce the carbon monoxide while producing additional hydrogen, resulting in water gas.H2O + C → H2 + CO (ΔH = +131 kJ/mol)<br>Hope this answer is helpful to u<br>A fuel gas containing about 5o percent carbon monoxide 40 percent hydrogen and small amount of methane, carbon dioxide and nitrogen made by passing stem and air over heated coke and coal is known as water gas.its composition is (CO+H2).it is used as fuel.<br>A fuel gas containing about 5o percent carbon monoxide 40 percent hydrogen and small amount of methane, carbon dioxide and nitrogen made by passing stem and air over heated coke and coal is known as water gas.its composition is (CO+H2).it is used as fuel. | |
| 1263. |
Why does silicon show a higher covalency than carbon?? |
| Answer» Carbon cannot have a valency beyond fourC6 = 1s22s22p2While silicon can extended covalency from 4 to 6Si14 = 1s22s22p63s23p2This is because of the absence of d-orbitals in the valence shell of carbon and presence of 3d-orbtials in the valence shell of silicon. Since silicon has vacant 3d- orbitals, it can accept electrons from electron donating species such as F- ion to form complex ion.<br>Hope this answer will help u<br>Catenation is the linkage of atoms of the same element into longer chains. Catenation occurs most readily in carbon, which forms covalent bonds with other carbon atoms to form longer chains and structures. | |
| 1264. |
Define Enantiomerism. |
| Answer» Stereoisomers which are related to each other as mirror images are called enantiomers. Enantiomers can contain any number of stereogenic centers, as long as each center is the exact mirror image of the corresponding center in the other molecule.<br>Enantiomers are chiral molecules that are mirror images of one another. Furthermore, the molecules are non-superimposable on one another. This means that the molecules cannot be placed on top of one another and give the same molecule. Chiral molecules with one or more stereocenters can be enantiomers. It is sometimes difficult to determine whether or not two molecules are enantiomers. For introductory purposes, simple molecules will be used as examples. | |
| 1265. |
Why Bcl3 exist as polymer while Alcl3 as dimere |
| Answer» | |
| 1266. |
What do you think by antacid? |
| Answer» AntacidsDefinitionAntacids are medicines that neutralize stomach acid.acids may be divided into two classes, those that work by chemical neutralization of gastric acid, most notably sodium bicarbonate; and those that act by adsorption of the acid (non-absorbable antacids), such as calcium and magnesium salts.<br>Opposite of acid\xa0 | |
| 1267. |
Main topic of organic chemistry some basic principles and techniques |
| Answer» Thank u<br>Nice<br>1. Shape, hybridisation and structure representation of carbon compounds2. Classification of organic compounds focusing on the concepts revolving around aromaticity3. Nomenclature and isomerism of organic compounds4. Homolytic and heterolytic cleavage5. Nucleophile and electrophile6. Electron displacement effects7. Purification of organic compounds esp. focussing on types of chromatography and distillation and its types<br>Please<br>Please help | |
| 1268. |
IUPAC NAME AND STRUCTURE OF COMPOUND [(CH3)3C]4C |
| Answer» | |
| 1269. |
Conversion bromomethane to propanone |
| Answer» First of all we react methyl bromide with ethyl bromide and sodium in presence of dry ether (wurtz reaction) ....it gives propane ...react propane with CI2...in presence of li8...Then react with aq KOH...then oxidise it with KMnO4 to give propanone..... | |
| 1270. |
Cho -cho common name |
| Answer» ethan -1-1- dialdehyde<br>Sorry..... ...... Right answer is - ethane - 1,1 - dial<br>Eth - 1,1 - dialdehyde | |
| 1271. |
Limitations of octet rule |
| Answer» 1 . Elements like H and He exist since they donot complete their octet. They complete their duplate. 2 . Formation of hypervalent compound i.e. compounds having more than 8 electrons in their valence shell. Eg. SiF6 , in this Si have 12 shared pair electrons ( 6 of Si and 6 of F) .3 . Formation of compound having less than 8 electrons in their valence shell. Eg. AlCl3, in which aluminum donot complete their octet, after been combined with three Cl, it has only 6 electrons in its valence shell<br>It cannot be applied to the nonmetals after silicon in the Periodic Table. These elements can “expand their octet” and have more than eight valence electrons around the central atom. Molecules with an odd number of electrons such as NO and NO₂ cannot satisfy the octet rule.<br>???? | |
| 1272. |
(sif6)2- is known whereas (sicl6)2- not . Give possible reason |
| Answer» in SiCl6(2-) the chlorine atom is much larger than flourine which does not allow the six chlorines to surround the silicon due to repulsions between chlorine atoms. silicon cannot acomodate 6 chlorines around it.Hence , due to interelectron repulsions between chlorine atoms the compound SiCl6(2-) is unstable and not known. | |
| 1273. |
Explain trend of electron gain enthalpy in the periods & group |
| Answer» The electron gain enthalpy of halogens is highly negative because it needs only one electron to achieve nearest noble gas configuration. And for noble gases, it is highly positive because the extra electron has to be placed in the next higher principal quantum level which requires lots of energy.<br>Electron gain enthalpy (ΔegH) is defined as the enthalpy change associated with an isolated gaseous atom (X) when it gains an electron to form its corresponding anion. The reaction can be given as below:X(g)+e−→X−(g)On the basis of nature of the element, the process of accepting electron in an atom can either be exothermic or endothermic. In general, energy is released when an electron is added to an atom and the electron gain enthalpy for such elements is negative. | |
| 1274. |
Hydrogen economy |
| Answer» The hydrogen economy is a proposed system of delivering energy using hydrogen. The term hydrogen economy was coined by John Bockris during a talk he gave in 1970 at General Motors Technical Center. The concept was proposed earlier by geneticist J.B.S. Haldane | |
| 1275. |
Why ice floats on water?Expect the reason density |
| Answer» We know that in ice, each oxygen atom is surrounded by four hydrogen atoms in such a way that the two hydrogen atoms are linked to an oxygen atom by covalent bonds whereas the other two hydrogen atoms are linked by hydrogen bonds. In ice (solid state), a water molecule is associated with four other water molecules through hydrogen bonding in a tetrahedral manner. This gives rise to open cage-like structure which prevents the close packing of molecules (lower density). When ice absorbs heat and melts to form water, the hydrogen bonds break and close packing of water molecules takes place. Due to this close packing, the density of water is higher than that of ice and hence ice floats over water. | |
| 1276. |
For an exothermic reaction what happens to the equilibrium constant if temperature is increased |
| Answer» Equilibrium constant decreases | |
| 1277. |
Find concentration of Br-and Mg2+if solubility product of MgBr2 is 2.21×10^-10 |
| Answer» Please reply me tomorrow is my chemistry exam ? | |
| 1278. |
What is relation between lattice and hydration enthalpywith also size |
| Answer» Lattice enthalpy is the heat released or change in energy when cation combines witb anion to form 1mole of compoundHydration is the energy released or energy change when a cation dissociated in water ...here there is no role of anion ... | |
| 1279. |
In a group moving top to down the atomic density |
| Answer» Decrease due to increase in no. of shell<br>It will increase because the addition of electrons in different subshell while moving top to down<br>Increases<br>Decreae as size increase<br>increases because mass increase | |
| 1280. |
Difference between cyclic and acyclic compounds |
| Answer» Compound consist of close chains or rings are cyclic compounds .eg-cyclopentane .Compound having straight chain of atoms are known acyclic .e.g.-butane | |
| 1281. |
Biric acid |
| Answer» H3bo3 hoga bhai<br>It is B2H6 shayad<br>Yaa<br>Yaar it is boric acid . Shayad | |
| 1282. |
Describe the discovery of cathode rays. |
| Answer» 1)The cathode rays are made up of material particles.2)They carry -ve charge.Hence, the above experiment explains that, cathode rays are negatively charged material particles called as ELECTRONS.<br>Cathode Ray Experiment: This is also known as discharge tube experiment , because it was initially done in a discharge tube .This experiment was carrried out by Willium Crookes in 1879 to explain the properties of negatively charged particles and conduction of electricity through gases in low pressure.Latter, the experiment was used by J.J Thomson to explain the nature of electron and discovery of electron.Mr. Cookes , studied that, electricity can be conducted through gases when at low pressure.Experiment: According to the above theory, a discharge tube (which is a long glass tube) is taken about 60cm long and sealed that tube at both the ends and fitted with two metal electrodes. It has a side tube fitted with a stop - ****. Now , this tube is connected to a vaccum pimp and the pressure inside the tube is lowered by using this pimp and maintained to 0.01 mm.A high voltage electricity of about 10,000 V is applied between the electrodes and the result is abtained.Observation: 1)some invisible rays are emitted from the -ve cathode which makes a greenish glow at the opposite wall of discharge tube.2)The rays coming from cathode , produces a shadow if a solid object is placed between the two electrodes; which explains that cathode rays travel in a straight line.3)If an external electric field is applied, the cathode rays are deflected towards the +ve anode , so the rays must carry a negative charge.4)They strike the metal foils and causes heating effect5)They cause ionization of the gas in the discharge tbe and produce X-rays when fall over hard metals like Tungstun, Molybdenum etc.They affect the photographic plates.Conclusion: | |
| 1283. |
Resonance |
| Answer» In chemistry, resonance or mesomerism is a way of describing delocalized electrons within certain molecules or polyatomic ions where the bonding cannot be expressed by one single Lewis structure<br>Resonance are the different structures to a same compound | |
| 1284. |
Which gas has low pressure than atmospheric pressure |
| Answer» | |
| 1285. |
Why lithium hydroxide is more stable than sodium hydroxide |
| Answer» Because of its small size.<br>Size of atomic radii<br>Due to its position in perioic table. | |
| 1286. |
What is steric hindrance |
| Answer» Steric hindrance is the slowing of chemical reactions due to steric bulk. It is usually manifested in intermolecular reactions, whereas discussion of steric effects often focus on intramolecular interactions. Steric hindrance is often exploited to control selectivity, such as slowing unwanted side-reactions. | |
| 1287. |
Why cupric ion is the oxidizing agent while the cuprous ion is a reducing agent . Give reason. |
| Answer» Cu+ ion can be both, an oxidizing and reducing agent. It is reducing agent towards stronger oxidants that Cu+ ions are by themselves (i.e. it reduced H2O2, KMnO4 as they are much more powerful oxidants then Cu+ ion) and it is an oxidizing reagent toward strong reducing compounds/elements such as Na. Zn, N2H4. | |
| 1288. |
How to make valence electron? |
| Answer» | |
| 1289. |
What is polarisation capacity |
| Answer» The quantity of electricity required to produce the polarization of a battery is termed its Polarization Capacity or Capacity of Polarization. | |
| 1290. |
How many cyclic isomers exists (structural and geometrical only) for C3H3CI3? |
| Answer» | |
| 1291. |
Organic kaise padhe |
| Answer» Thanks<br>There are some easy steps which we should remember while studying organic chemistry. So 1 organic is starting concepts are usefull many a time in further so we need to revise it at regular intervals of time so we will not difficulty in future... | |
| 1292. |
Why alkyne are acidic in nature? |
| Answer» The acidity of a terminal alkyne is due to the high level of s character in the sp hybrid orbital , which bonds with s orbitals of the hydrogen atom to form a covalent bond . The high level of S character in an sp hybridilized carbon cause the overlap region of the sigma bond to shift much closer to the carbon atom . | |
| 1293. |
What is the law of mass action? |
| Answer» the principle that the rate of a chemical reaction is proportional to the concentrations of the reacting substances | |
| 1294. |
An element with atomic number 117 is known as...?? |
| Answer» It is a member of the halogen group. The element, No. 117 on the Periodic Table of Elements, had previously been designated ununseptium, a placeholder name that means one-one-seven in Latin. In November 2016, the International Union of Pure and Applied Chemistry (IUPAC) approved the name tennessine for element 117<br>It will still be known as an element | |
| 1295. |
What do you mean by water stability |
| Answer» | |
| 1296. |
What is latice enthalpy |
| Answer» The energy released when 1mole of a solid ionic compound is formed by the combination of its constituent ions is known as lattice enthalpy . | |
| 1297. |
Which is the most electropositive elements?Na,Cu,Cs,Ca |
| Answer» Cesium due to large size<br>Cesium ,as electropositivity increases down the group. | |
| 1298. |
Which alkali metal is strongest reducing agent |
| Answer» Lithium<br>Lithium | |
| 1299. |
An element p has atomic number 56. What will be the formula of its halide |
| Answer» Answer - PX2Element \'P\' with atomic number 56 will lose two electrons to form P^ 2+ ion with 54 electrons corresponding to the stable noble gas electronic configuration.Halogen gains one electron to formX^-1 ion. One P^2+ ion combines with two X^-1 ions to formPX2 .Note: In a neutral molecule, the total charge on cations is numerically equal to the total charge on anions. | |
| 1300. |
What is the formula of MOT |
| Answer» Mother Of Thanos | |