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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.
| 2951. |
1. Variable valency is exhibited by-(a) Ca (b) As (c) B (d) Fe |
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| 2952. |
Explain Hess\'s law of constant heat summation |
| Answer» ess\'s law of constant heat summation: The law states that the change in enthalpy for a reaction is the same whether the reaction takes place in one or a series of steps. The Hess\'s law can also be stated as the enthalpy change for a chemical reaction is the same regardless of the path by which the reaction occurs.For example, consider following two paths for the preparation of methylene chloridePath I :CH4\u200b(g)+2Cl2\u200b(g)→CH2\u200bCl2\u200b(g)+2HCl(g) ΔH10\u200b=−202.3kJPath II :CH4\u200b(g)+Cl2\u200b(g)→CH3\u200bCl(g)+HCl(g)ΔH20\u200b=−98.3kJCH3\u200bCl(g)+Cl2\u200b(g)→CH2\u200bCl2\u200b(g)+HCl(g)ΔH30\u200b=−104.0kJAdding two stepsCH4\u200b(g)+2Cl2\u200b(g)→CH2\u200bCl2\u200b(g)+2HCl(g) ΔH20=−202.3kJThus whether we follow path I or path II, the enthalpy change of the reaction is same.\xa0ΔH10\u200b=ΔH20\u200b+ΔH30\u200b=−202.3kJ | |
| 2953. |
What is isoelectric elements. ? |
| Answer» Good afternoon bhai ?.....kaise ho??? | |
| 2954. |
How to find numbers of neutron for a given compound |
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| 2955. |
All chlorine - oxygen distances in ClO4- is 144pm. Explain why |
| Answer» The chlorine to oxygen bond distance in\xa0ClO4\u200b−\xa0is\xa01.44A∘. From this, we can conclude that there must be a considerable double bond character in the bonds.AnsFrom its resonating structure, it can be seen that it have\xa0considerable double bond character in the bonds.Hence, the statement is correct. | |
| 2956. |
Number of atoms in 52 moles of na |
| Answer» No. of moles =52Then =52×6.022×10^23=313.144 ×10^23=3.13144×10^25 atoms | |
| 2957. |
What are the conjugate acid and conjugate base HsO4 |
| Answer» HSO4- is a\xa0base\xa0on the other side of equation - it is the thing that ACCEPTS the proton, so it would act as a\xa0BASE. It is the\xa0conjugate base\xa0of\xa0H2SO4.\xa0H2SO4/HSO4- is an\xa0acid/conjugate base pair. H20 is the\xa0base\xa0in the forward rxn, because it accepts a proton, and becomes H3O+.\xa0An\xa0acid\xa0and a\xa0base\xa0which differ only by the presence or absence of a proton are called a\xa0conjugate acid-base\xa0pair. Thus NH3\xa0is called the\xa0conjugate base\xa0of NH4+, and NH4+\xa0is the\xa0conjugate acid\xa0of NH3. Similarly, HF is the\xa0conjugate acid\xa0of F–, and F–\xa0the\xa0conjugate base\xa0o<br>HSO4- is a\xa0base\xa0on the other side of equation - it is the thing that ACCEPTS the proton, so it would act as a\xa0BASE. It is the\xa0conjugate base\xa0of\xa0H2SO4.\xa0H2SO4/HSO4- is an\xa0acid/conjugate base pair. H20 is the\xa0base\xa0in the forward rxn, because it accepts a proton, and becomes H3O+.\xa0An\xa0acid\xa0and a\xa0base\xa0which differ only by the presence or absence of a proton are called a\xa0conjugate acid-base\xa0pair. Thus NH3\xa0is called the\xa0conjugate base\xa0of NH4+, and NH4+\xa0is the\xa0conjugate acid\xa0of NH3. Similarly, HF is the\xa0conjugate acid\xa0of F–, and F–\xa0the\xa0conjugate base\xa0of HF. | |
| 2958. |
IS the bomb calorimeter explod? |
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| 2959. |
Calculate the ratio of kinetic enrgy of the second and third bohr orbit for hydrogen atom |
| Answer» The ratio of kinetic energy and potential energy of an electron in a Bohr orbit of a hydrogen-like series is -1/2 | |
| 2960. |
What is the shape of a 3d orbital |
| Answer» Oh...sorry GST mtlb....anyway iska koi answer nahi hai....pichle kuch dino se hamesa active rah raha hu.....I mean jab bhi phone liyea yek bar check karte hai ki apne dosto ka msg hai ki nahi? ...ok jao padho doctor madam....byee<br>Left it....koi disturbance to nahi hai naa padhai me....social media....I hope aisa koi disturbance nahi hai.....I tell you agar ghar pe concentrate hoke padho to hostel se jada padh logi....padhai me koi disturbance ho to use manage karo.....11th January last tak complete ho jana chahiyea.......aur maine kab boring bola.....name change karo but uske liye hame doshi mat banao | |
| 2961. |
Which is more electropositive li or be |
| Answer» Yaha itna pandemic nahi hai....safe hi hai.....tumhe to sabki yad ati hai? mom bhi achi hai.....baki bhaiya ka exam to bhaiya hi Jane ......aaj kal pubg ke sikar hua hai....padhai bas dikhane ke liyea.....hamse bolte hai ki patna chalne ke bad padhenge.....<br>Good....aur ghar me sab thik hai....chotu kaise hai....padhai karta hai ya sirf badmashi<br>Mtlb abhi tak hostel join nahi ki ho phir bhi itna din bad ??....seraj bol raha tha ki tum hostel chali gai ho??? | |
| 2962. |
Why 2nd law of thermodynamics came into existence |
| Answer» Dushra account banaye raho block hone wali ho????? Time pass kar rahe hai or kya.....<br>Hath math jodo...hame pap lagega ..... tumhare ashirwad bana rahe bas... | |
| 2963. |
What is resonance structures |
| Answer» Hello....I miss you very much....sach me yrr bahot miss kiya maine....waise hostel me phone kaise mila???....chodo aur batao padhai kaise chal rahi hai???<br>In chemistry, resonance is a way of describing bonding in certain molecules or ions by the combination of several contributing structures into a resonance hybrid in valence bond theory. Resonance structures: Is defined as difference between actual bond energy and energy of most stable resonating\xa0structures.\xa0Resonance\xa0averages the bond characteristics of a molecule as a whole.\xa0Resonance\xa0stabilizes the molecule because energy of the\xa0resonance\xa0hybrid is less than the energy of any canonical forms. | |
| 2964. |
O has lower delta i H thank N and F |
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| 2965. |
What is eletronegitivity ??? |
| Answer» A | |
| 2966. |
What is the bond order between C and O |
| Answer» Moch aai hai .....kaise??? Fracture to nahi hai na?.....ulta has rahi ho.....<br>Yeah your name is familiar?......how r u<br>[BOND ORDER]co=3<br>Species\xa0CO\xa0(14), contain bonding electrons =10\xa0and antibonding electrons\xa0= 4.\xa0Bond order\xa0=(Nb\u200b−Na)/ 2 \u200b\u200b= (10−4\u200b)/2 = 3. | |
| 2967. |
Atom present in oxygen molecule |
| Answer» Oxygen\xa0is a chemical element – a substance that contains only one type of\xa0atom. Its official chemical symbol is O, and its\xa0atomic\xa0number is 8, which means that an\xa0oxygen atom\xa0has eight protons in its nucleus. | |
| 2968. |
What are transition elements ? |
| Answer» Transition elements are those elements in which the atoms or ions (in stable oxidation state) contain partially filled d-orbital. These elements lie in the d-block and show a transition of properties between s-block and p-block. Therefore, these are called transition elements.<br>The elements present between s block and p block which shows transition frm metals to non metals.? | |
| 2969. |
What is difference between particle and molecule ?? |
| Answer» Molecules -\xa01. Molecules refers to combinations for more than 1 atom.2. A molecule is molecular level and have its chemical properties.3. It is at the chemical level that represents chemical properties of that element through out the reaction.\xa0Particles -\xa01. Particles are not clear word in their sense. Particles refer to any assumed small thing that exist2. It is not necessary that a particle have its own chemical properties.3. It is not chemical level of organisation. It can be notices with nacked eyes or using simple microscope. | |
| 2970. |
Why cation are smaller in size explain with example |
| Answer» Because of high nuclear charge and less negative charge<br>Hat | |
| 2971. |
Modern periodic law ... |
| Answer» The physical and chemical properties of elements are the periodic functions of atomic numbers<br>The modern periodic law was given by mossile then according to this law the phisical and chemical propertors are based on the peeiodicity of their increasing atomic numbers<br>Gm bhai | |
| 2972. |
Geometry structure of methan |
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| 2973. |
The bond moment of O-H bond in water H2O is 1.5 Debye |
| Answer» ~ 1.84D | |
| 2974. |
About Bohra model |
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| 2975. |
What are the Si unit of mass, length & time? |
| Answer» Mass is kilogram(kg)Lenght is meter(m)Time is second( s)<br>Kg m s<br>Bc kg =mass mc<br>Mass =kgTime secondLength=meter | |
| 2976. |
Structure of dimethylphenol |
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| 2977. |
Calculate the percentage of ionic character for HF having bond length 0.83A and dipole moment 1.82D |
| Answer» \xa0To calculate % gornic character we consider 100 % iconic bond.μ=Q×d=(1.60×10−19C)×0.83×10−10m×(1D/ 3.336×10−30\u200b)% gonic character\xa0=1.82/3.980 \u200b×100=45.70%% covalent character = (100-% ginoc character)=54.3% | |
| 2978. |
What is chemistry? Discuss the importance of chemistry |
| Answer» Chemistry is a ****. It has null importance?? | |
| 2979. |
Important questions of chemistry ... |
| Answer» Suprabhat dono ko...<br>Ha thik hu ....aur study bhi up and down chal rahi hai...? Syllabus kaha tak hua???<br>Gm bhai kaise ho?.....padhai kaise chal rahi??<br>All questions are important if you had not studied them | |
| 2980. |
Can atoms of same element be identical |
| Answer» No. Two\xa0atoms\xa0of the\xa0same\xa0chemical\xa0element\xa0are typically not\xa0identical. | |
| 2981. |
Are two atoms of different element identical ? |
| Answer» No. Two atoms of the same chemical element are typically\xa0not\xa0identical. First of all, there is a range of possible states that the electrons of an atom can occupy. Two atoms of the same element can be different if their electrons are in different states. If one copper atom has an electron in an excited state and another copper atom has all of its electrons in the ground state, then the two atoms are different. | |
| 2982. |
How anti chimese virus were made? Pls explain |
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| 2983. |
What is the formula of anti chimese virus? |
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| 2984. |
Reactants?? |
| Answer» Leave it brooo... Aisa logo k se baat hi na karo.. Tabhi achha hai.......<br>Thakur bhai so ja<br>Dear tu hai<br>Good night ? | |
| 2985. |
Chemical reactions? |
| Answer» Isme funny kyaa hai... Royal abc??? ? ha bro.. Ho gya.. Apka??<br>hello everyone?... Gud nyttt.... So jao sbb.. Vrna hastar aa jayega ???????<br>So funny | |
| 2986. |
Is ncert is enough for neet ? |
| Answer» I think noooo ?<br>Most welcome<br>Yes NCERT is enough for chemistry | |
| 2987. |
Formation of O- from O is an exothermic reaction. Explain why? |
| Answer» Because it is a exothermic reaction<br>Electron gain enthalphy for oxygen is negative because oxygen being an electronegative atom can easily accept electron.But gaining one more electron to\xa0O2\u200b\xa0will mean much more stability,so it is be an exothermic reaction.This expectation is true if we consider a neutral species but as\xa0O−\xa0is negligibely charged adding another negativelly charged species will be diffcult as the like charges will repel each other ,so in order to force the electronn to fuse with\xa0O−\xa0ion we supply energy in form of heat .This males it endothermic. | |
| 2988. |
Hund ka adhikatam bahulta ka niyam udahran sahit |
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| 2989. |
Boyle law graphically |
| Answer» Boyle’s Law\tBoyle’s law was stated by Robert Boyle.\tIt states that at constanttemperature, the pressure of a fixednumber of moles nof gasvaries inversely with its volume.k1\xa0= Proportionality constant.\tIt depends upon the amount and temperature of gas. It also depends upon the units in which p as well v are expressed.\tLet volume V1\xa0is occupied at pressure P1\xa0and temperature T1.\tAgain volume V2\xa0is occupied at pressure P2\xa0and temperature T2. Mathematically, as per Boyle’s law:P1\xa0V1= P2\xa0V2\xa0= ConstantP1/P2\xa0\xa0= V2/V1\xa0\tThe curve corresponding to differentconstant temperature is calledisotherm.\tHighercurves correspond to higher temperature.\tThe graph represents a straight line passing through the But under high pressures gases\tdeviate from Boyle’s law and consequently there is no straight line in the graph.\tThis signifies that gases become denser at high pressure.\tDensity is defined as the ratio of mass by volume. Desity = Mass/ Volume = m/v\tUsing the value of v from Boyle’s law equation, value of d can be further modified as | |
| 2990. |
What is electronic configuration of chlorine |
| Answer» The atomic number of Chlorine (Cl) is\xa017. Thus its electronic configuration is\xa0[Ne]3s23p5\xa0or\xa01s22s22p63s23p5Explanation:In order to write the Chlorine electron configuration we first need to know the number of electrons for the Cl atom (there are 17 electrons). When we write the configuration we\'ll put all 17 electrons in orbitals around the nucleus of the Chlorine atom.In writing the electron configuration for Chlorine the first two electrons will go in the 1s orbital. Since 1s can only hold two electrons the next 2 electrons for Chlorine go in the 2s orbital. The next six electrons will go in the 2p orbital. The p orbital can hold up to six electrons. We\'ll put six in the 2p orbital and then put the next two electrons in the 3s. Since the 3s if now full we\'ll move to the 3p where we\'ll place the remaining five electrons. Therefore the Chlorine electron configuration will be 1s22s22p63s23p5. | |
| 2991. |
Balance the equation in ion electron method in acid mediumCr2O7+H++l-=cr3++i2+h2o |
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| 2992. |
Cl-, Br-, F-,I- in increasing order of ionic size |
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| 2993. |
What is stachiometry |
| Answer» Stoichiometry as the calculation of products and reactants in a chemical reaction. It is basically concerned with numbers.Stoichiometry is an important concept in chemistry that helps us use balanced\xa0chemical equations\xa0to calculate amounts of reactants and products. Here, we make use of ratios from the balanced equation. In general, all the reactions that take place are dependent on one main factor, how much substance is present. | |
| 2994. |
Chemical bond of agcl in electrocovalent |
| Answer» Thanks<br>Electrovalent bonds are produced when electrons are transferred from atoms of one element to atoms of another element, producing positive and negative ions. The bond which is formed by the transfer of electrons between the atoms is called an electrovalent bond or ionic bond. | |
| 2995. |
Rutherford model of atom? ? |
| Answer» Good morning<br>Gud mrng!!<br>Are you talking about the Nuclear Model of Atom by Rutherford??? | |
| 2996. |
Draw Lewis structure any 5 molecules |
| Answer» A Lewis Electron Dot Formula comprises one dot for every valence electron and an element’s symbol. Stages to articulate the electron dot formula are stated beneath. Note down a skeletal structure displaying a realistic bonding pattern by means of only the element symbols.\xa0 | |
| 2997. |
Define limiting reagent? |
| Answer» Thanks.?<br>Limiting reagents are the substances that are\xa0completely consumed in the completion of a chemical reaction.\xa0They are also referred to as limiting agents or limiting reactants. According to the\xa0stoichiometry\xa0of chemical reactions, a fixed amount of reactants is required for the completion of the reaction. Let us consider the following reaction of formation of ammonia:3H2\xa0+ N2\xa0→ 2NH3<br>Thanks bro | |
| 2998. |
What is atom.... ¿¿...??.. |
| Answer» Hello bhai....koi nahi sis. it\'s ok<br>Sorry... Pk bro... Novel to mai nahi padhti... ?isliye name bhi nahi ptaaa... | |
| 2999. |
What is molarity and molality?? |
| Answer» Molarity is the concentration of number of moles in 1 volume of solution in litres<br>Molality is also known as Molal Concentration and It is one measure for Solute concentration.Molarity\xa0is a measurement of the moles in the total volume of the solution, | |
| 3000. |
What is open system |
| Answer» Open System: -\xa0In this system there is exchange of energy and matter. For Example: - Water boils in a pan without lid, a cup of coffee.Example:\xa0Water is boiling in a pan without lid.<br>It is exchange of both energy and matter with surrounding | |