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This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 1001. |
State and explain Hess\'s law of heat summation |
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| 1002. |
What is fallency |
| Answer» If your mean valency . Here is your answerValency of an atom is equal to the number of electrons in the outer shell.If the number of electrons in the outermost shell is four or less than four then it is the valency of that atom. Otherwise, the valency is eight minus the number of electrons in the outermost shell.If you know the number of electrons in the outer shell then you can calculate the valency. | |
| 1003. |
What is heterogeneous mixture |
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Answer» Your wellcome. Your wellcome. And your answer is................Homogeneous mixture•A mixture which has uniform composition and properties throughout its mass is called a homogeneous mixture.•Example: All solutions such as sugar solution, salt solution etc Thanks Ayushi but also tell me the defination of homogenous mixture please Yes,thats correct. Heterogeneous mixture•A mixture which has a different composition and properties in different parts of their mass is called a heterogeneous mixture.•Example: Suspension (sand mixed with salt, sugar in oil) and colloids (milk in water). |
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| 1004. |
How many types of hydrocarbons |
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Answer» Saturated and unsaturated Two types: saturated and unsaturated hydrocarbons 3 |
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| 1005. |
What is electrophilic substution reaction |
| Answer» When an electrophile replace an atom from an compound the reaction is called electrophilic substitution reaction. | |
| 1006. |
How to find oxidation number easily? |
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| 1007. |
Describe tautomerism Compleate |
| Answer» Tautomers are isomers of a compound which differ only in the position of the protons and electrons. The carbon skeleton of the compound is unchanged. A reaction which involves simple proton transfer in an intramolecular fashion is called a tautomerism. | |
| 1008. |
Marking schem of chemistry |
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| 1009. |
What is hesinbrug uncertainty theorem? |
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Answer» Uncertainty principle, also called Heisenberg uncertainty principle or indeterminacy principle, statement, articulated (1927) by the German physicist Werner Heisenberg, that the position and the velocity of an object cannot both be measured exactly, at the same time, even in theory. The very concepts of exact position and exact velocity together, in fact, have no meaning in nature. \tThis principle was in favor of the wave nature of matter\tIt stated that it is impossible to simultaneously evaluate the precise position and momentum of particle. There is always some probability in predicting the position and momentum of a particle. Mathematically, it can be written as: (Δx)(Δp) ≥ h/(2π) |
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| 1010. |
What is homogenous and heterogenous equillibrium? |
| Answer» The terms h\u200beterogeneous and homogeneous refer to mixtures of materials in chemistry.Homogeneous equilibrium: When in an equilibrium reaction, all the reactants and the products are present in the same phase , it is called homogeneous equilibrium.Heterogeneous equilibrium : When in an equilibrium reaction, all the reactants and the products are present in two or more than two phases , it is called heterogeneous equilibrium. | |
| 1011. |
Magnesium is burned in air |
| Answer» Mg + O2 =2MgOMgO is a white powder | |
| 1012. |
Magnesium us burned in ait |
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| 1013. |
Find the order of acidic strength of ortho nitro phynol , para nitro phynol |
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Answer» Ortho is more acidic than para because of negative inductive as well as negative resonance effect are operated by no2 in Ortho nitro phenol. Also when no2 is on para position, there is a lot of distance between OH and NO2, so only negative inductive effect operates. Why ortho is more acidic than para nitro phynol??? Ortho is more acidic than para nitro phenol |
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| 1014. |
Molecular orbital of o2 |
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| 1015. |
What is steric hinderene |
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Answer» Stearic hindrance is the hindrance or boundation in bond formation due to the presence of large atoms around the central atom due to which there is Lack of space, and the incoming species finds it difficult to form bond Space around the carbon chain |
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| 1016. |
This is latest sample paper |
| Answer» Which paper | |
| 1017. |
Find ratio of 100:50 with full details |
| Answer» 100 : 50 = 2:1.... | |
| 1018. |
How can we decide oxudation and reduction. With the help of standard electrode potential |
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| 1019. |
What is the oxidation number of Cr in CrO5 |
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Answer» Rue to it butterfly like structure +6 +6 +6 When we solve this equation,Cr+2*(-5)=0We get +10 which is not possible as chromium has max. Of +6 electrons .In CrO5 one oxygen is double bonded to the Cr atom and there are peroxide linkage.As we know oxygen peroxide has -1 o.s and double bond atom in -2 state Cr+5(-1)=1Cr=+6 |
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| 1020. |
Give chemical reactions to prepare chloro benzene from benzene |
| Answer» by halogenation reactionreact benzene with chlorine in the presence of anhydrous AlCl3 | |
| 1021. |
calculate the number of atoms in 4 gram of He |
| Answer» No of atoms = 6.022×10^23× 4/4= 6.022 ×10^23 | |
| 1022. |
Why diamond is the most expensive gemstone |
| Answer» Renowned for being the hardest substance on earth, its sparkling fire, durability, and rarity make Diamond the most prized of all gems. | |
| 1023. |
How to calculate Oxidation number of Cr2O72- |
| Answer» 2Cr+7O=-22Cr+7(-2)=-22Cr-14=-22Cr=12Cr=+6 | |
| 1024. |
What is the second law of thermodynamics |
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Answer» Yogita ingle nice copy paste There are 2 statements of second law of thermodynamics given by two scientists:\tKelvin-Planck ∫Statement: - No process is possible whose result is the absorption of heat from a reservoir and the complete conversion of the heat into work.\tClausius statement: - No process is possible whose result is the transfer of heat from a colder object to a hotter object.Explanation of Kelvin-Planck Statement: It is always impossible that the total amount of heat which is supplied to system will get converted to work, and there will always be loss of heat. Complete conversion of heat into work is not possible.Explanation of Clausius statement: - Transfer of heat from colder body to hotter body won’t take place until some external work is done on the system. |
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| 1025. |
Give reasons Lithium salts are most hydrated |
| Answer» Because lithium size is very small | |
| 1026. |
Ammonia prepared using dihydrogen |
| Answer» N2+3H2-----2NH3 | |
| 1027. |
During IUPAC naming which is preferrd wether the cycle or chain? |
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Answer» Firstly parent chain is preferred During IUPAC naming where the functional group is attached is preferred Chain |
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| 1028. |
What is cis and trans isomer? |
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Answer» They are geometrical isomers. \tCis isomers are molecules with the same connectivity of atoms. They further consist of identical side groups usually on the same side. It is most of the time a polar molecule. Due to loosely packed molecules the melting point of cis isomer is comparatively low.\tA trans isomer has molecules with two same atoms but in the opposite side of the double bond. It is nonpolar or less polar molecule. Due to tightly packed molecules the melting point of trans isomer is high. |
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| 1029. |
Le chatlier principle |
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Answer» According to it whenever there is any change in the equilibrium , the equilibrium is shift in such a manner to minimize that effect. When an equilibrium is subjected to any kind of stress (change in concetration, temperature or pressure) it shifts in a direction so as to undo the effect of stress. |
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| 1030. |
Will you give me the answer key of chemistry practice paper for class 11 in this app\xa0 |
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| 1031. |
Which colloid is used for preparing the medicine of leishmaniasis(kala-jar)? |
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| 1032. |
Wateage of each chapter |
| Answer» Infinite tonn of **** ? | |
| 1033. |
When is free radical formed? |
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Answer» Free radicals are generally the products of the homolytic fission reactions.eg..............Cl--Cl bond only breaks with homolytic fission i.e. ...................as.....Cl• + Cl• ... A free radical reaction is any chemical reaction which involves free radicals.In the mechanism of a chemical reaction if the attacking reagent is free radical then that reaction mechanism is called free radical mechanism.Example: Halogination of alkanes |
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| 1034. |
Name the effect which decide the stability of alkenes?? |
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Answer» Hyperconjugation hope this will help u?? Hyperconjugation |
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| 1035. |
what is common ion effect with examples |
| Answer» If in a aqueous of week electrolyte, a strong electrolyte is added having an ion common with week electrolyte then the dissociation of week electrolyte decreases.The effect by which dissociation of week electrolyte decreases is known as common ion effect.For example:-In aqueous solution of CH3COOH(a week electrolyte), a small amount of CH3COONA(strong electrolyte) is added.Due to presence of common ion CH3COO- the concentration of CH3COOH decreases.CH3COOH--------------->CH3COO- +H^+CH3COONA----------------->CH3COO- + H^+ | |
| 1036. |
Why is pbcl4 is less stable than sncl4 |
| Answer» The stability of higher oxidation state decrease down the group whereas the stability of lower oxidation state increase down the group. This trend is the consequence of inert pair effect due to which two electron of lead in s orbital do not participate in chemical bonding. Hence Pb shows +2 oxidation state predominantly.Whereas no such effect occur in Sn and hence it prefer to form SnCl4\xa0in comparison of SnCl2.\xa0 | |
| 1037. |
Comparison of the vander waal\'s radius and covalent radius |
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| 1038. |
Mgcl2 exist as MgCl2.6H2O where NaCl exist as the same why |
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Answer» Because of the diagonal relation between Mg and Na Because as we move left to right in period hydration enthalpy increases which leads to hyrous salt of mgcl2 |
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| 1039. |
Define polynuclear hydrocarbon. |
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Answer» It is stated that those H.C. compound which contain more than 2 organic compound. organic compounds containing only carbon and hydrogen that are composed of multiple aromatic rings |
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| 1040. |
What is the difference between 2H or H2 ?? |
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Answer» I think so that annie ka answer right hai Which one is correct?? 2 H means 2 mol of hydrogen and H2 means two hydrogen in bonding i think 2h means two h atom and h2 means one h molecule... |
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| 1041. |
What type of questions are asked in hydrocarbon chapter?? |
| Answer» About different types of reactions of alkanes, alkenes, alkynes and benzene compunds. Their chemical and physical properties and their mechanism. Also, mainly in exams naming reactions(, i.e like wurtz reaction ) are asked. .. | |
| 1042. |
Mention the type of inter molecular attraction force between he and hcl molecule |
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| 1043. |
Calculate normality if 49g of H2SO4 is added to to form its 1L solution??? |
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| 1044. |
What is the thermodainamic |
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Answer» Study of heat, workdone is called thermodyamics Study of relation between heat ,internal energy and work done is known as thermodynamics |
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| 1045. |
Size of Ga us greater than Al why |
| Answer» Size of Ga is smaller than Al because of poor shielding effect of d-orbital electron | |
| 1046. |
Mention the factors which influence the formation of ionic bond |
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| 1047. |
CO2 is green house gas yes or no and why |
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Answer» Yes it is because it absorb and emit light aenergy Yes Because it absorb and emit radiant energy within thermal infrared range |
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| 1048. |
solvay process in detail....??? |
| Answer» The Solvay process is used for the manufacture sodium carbonate Na2CO3 (washing soda). In this process, brine (NaCl), NH3 and CO2 are the raw materials.The steps involved in this process are:1. Purification of saturated brine2. Reaction of saturated brine with gaseous ammonia3. The ammoniated brine is carbonated with CO2 to form NaHCO34. NaHCO3 is insoluble in brine solution. so it can be filtered out.5. On heating, NaHCO3 decomposes to Na2CO36. CaCO3 is also used to provide CO2. | |
| 1049. |
Why the water is in the liquid form but not in the solid form explain it |
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Answer» Hydrogen bonding........? Because in water molecules are loosely packed and at normal room temperature it exist in liquid form |
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| 1050. |
N2 B2 O7 find hybridization of N and B |
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