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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.
| 251. |
Ncert pg no. 37 pr graph (fig 2.8) koi mujhe smjha do .. structure of atom ka hai ... |
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| 252. |
Is the electrons have wave nature or particle |
| Answer» It has duel nature<br>According to de-Broglie electron have both particle as well as wave nature.<br>Both<br>Wave nature | |
| 253. |
Write the difference between in electo valent and nd covalent bond |
| Answer» Electrovalent bonds are formed by complete transfer of electrons while covalent bonds are formed by sharing of electrons | |
| 254. |
Help me in the ch Structure of an atom !!! |
| Answer» Yes , i m ready<br>Wat help u want? | |
| 255. |
So4 to the power -2 ion |
| Answer» | |
| 256. |
Calculate the molar mass of the following h2o |
| Answer» 18u<br>18u<br>18amu<br>H2O (2×1)+16=18u18u is the molar mass.<br>18 u is the molar mass of H20 | |
| 257. |
Give significance of psi and psi^2. Also explain the concept of probability with example. |
| Answer» The wave function\xa0psi\xa0by itself have no physical\xa0Significance. It shows the amplitude of electron wave ( wave function).\xa0\xa0{tex}\\psi ^ { 2 }{/tex}\xa0represents probability of finding an electron around the nucleus. | |
| 258. |
explain aufbau principle |
| Answer» Aufbau principal states that electrons are added progressively to the varoius orbitals in the order of increasing energy, stsrting eith the orbital lowest energy<br>Aufbau\'s principle states that in a ground state of an atom the orbital are filled in order of their increasing energies.. | |
| 259. |
Calculate molarity of solution of ethanol in water in which the mole fraction of ethanol is 0.040 |
| Answer» Let the mole fraction of ethanol (C2H5OH)\xa0be represented by x,Then the following expression represents its mole fraction in ethanol solution-\xa0xC2h5OH =\xa0{tex}\\frac{\\mathrm{n}\\left(\\mathrm{C}_{2} \\mathrm{H}_{5} \\mathrm{OH}\\right)}{\\mathrm{n}\\left(\\mathrm{C}_{2} \\mathrm{H}_{5} \\mathrm{OH}\\right)+\\mathrm{n}\\left(\\mathrm{H}_{2} \\mathrm{O}\\right)}{/tex}(where x\xa0C2H5OHrepresents mole fraction of ethanol)= 0.040 (given)....(i);where "n\'\' (represents number of moles of the two referred liquids in ethanol solution).The following steps are used for\xa0calculations,The aim is to find number of moles of ethanol in 1 L of the solution.Step 1 /- No. of moles in 1 L of water=\xa0{tex}\\frac{1000 \\mathrm \\ {g}}{18 \\mathrm \\ {g} \\mathrm \\ {mol}^{-1}}{/tex}= 55.55 molesStep 2 /-. Substituting n (H2O)= 55.55 in equation (i), we getx (\xa0C2H5OH)=\xa0{tex}\\frac{\\mathrm{n}\\left(\\mathrm{C}_{2} \\mathrm{H}_{5} \\mathrm{OH}\\right)}{\\mathrm{n}\\left(\\mathrm{C}_{2} \\mathrm{H}_{5} \\mathrm{OH}\\right)+55.55}{/tex}= 0.040......(given )solving for n (C2H5OH) we get,0.96 n ( C2\xa0H5\xa0OH )\xa0= 55.55\xa0{tex}\\times{/tex} 0.040{tex}\\therefore{/tex}\xa0n (C2H5OH)= 2.31 molsSo 2.31 moles of C2\xa0H5\xa0OH are present per litre of given ethanol solution.\xa0Hence,the\xa0molarity of the solution of ethanol is\xa02.31 M. | |
| 260. |
Short note on ruthorford model of an atom |
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| 261. |
Calculate the mass of 0.72 molecules of CO2 |
| Answer» Molecular mass of CO2 = Atomic mass of C + 2 {tex}\\times{/tex}\xa0Atomic mass of O= (12u + 2 {tex}\\times{/tex}\xa016u) = 44uGram molecular mass of CO2 = 44 g1 gram molecule of CO2 = 44 g0.72 gram molecule of CO2 {tex} = \\frac{{\\left( {44g} \\right)}}{{\\left( {1g} \\right)}} \\times \\left( {0.72g} \\right) = 31.68g{/tex} | |
| 262. |
Definition atomic radius |
| Answer» Atomic radius is defined as the distance from the centre of the nucleus of\xa0atom to the outermost shell of electrons. | |
| 263. |
How much water should be added in 50 ml of 2m hcl solution to make it m/10 |
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| 264. |
Rutherford\'s atomic model |
| Answer» Experiment by alpha particles | |
| 265. |
Isotops |
| Answer» The atom have same atomic number but different mass number is known as isotopes.<br>An isotope is one or two or more nuclids that are chemically identical. Isotopes have the same number of protons but different in their mass number. There nuclei contains different number of neutrons.<br>The atoms that having same atomic number but different mass numbers | |
| 266. |
What molality is preferred over molarity |
| Answer» Molality is temperature independent while molarity decreases with increase in concentration. This is because of expansion or contraction of the liquid with temperature. | |
| 267. |
What is molecular mass |
| Answer» sum of atomic masses of the elements present in a molecule<br>Molecular mass is the sum of atomic masses of the elements present in a molecule . | |
| 268. |
Explain neil bohr\'s model of atom |
| Answer» Thank u<br>Bohr model of the atom was proposed by Neil Bohr in 1915. It came into existence with the modification of Rutherford’s model of an atom. Rutherford’s model introduced the nuclear model of an atom, in which he explained that a nucleus (positively charged) is surrounded by negatively charged electrons. Bohr modified this atomic structure model by explaining that electrons move in fixed orbital’s (shells) and not anywhere in between and he also explained that each orbit (shell) has a fixed energy level. Rutherford basically explained nucleus of an atom and Bohr modified that model into electrons and their energy levels.Postulates of Bohr’s Model of an Atom\tIn an atom, electrons (negatively charged) revolve around the positively charged nucleus in a definite circular path called as orbits or shells.\tEach orbit or shell has a fixed energy and these circular orbits are known as orbital shells.\tThe energy levels are represented by an integer (n=1, 2, 3…) known as the\xa0quantum number. This range of quantum number starts from nucleus side with n=1 having the lowest energy level. The orbits n=1, 2, 3, 4… are assigned as K, L, M, N…. shells and when an electron attains the lowest energy level it is said to be in the ground state.\tThe electrons in an atom move from a lower energy level to a higher energy level by gaining the required energy and an electron moves from a higher energy level to lower energy level by losing energy. | |
| 269. |
Can you answer me in hindi |
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| 270. |
Write down the limitation of electromagnetic wavelenght |
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| 271. |
A photon has mass of 8.6 ×10 - 30kg calculate its wavelength |
| Answer» no | |
| 272. |
What is the formula of critical temperature n pressure |
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| 273. |
Value of 1 mole |
| Answer» 6.022×10²³ emtities<br>1 mole = 6.022×10(23) atom/ions/emtities<br>6.922×10(23)<br>Avagadro no. 6.002×10(23) | |
| 274. |
Molality remains same but molarity changes by which factor |
| Answer» Temperature<br>Temperature<br>Elecronegativity | |
| 275. |
The percent of nitrogen in urea |
| Answer» 46.6%<br>46.6%<br>46.67% | |
| 276. |
What is the drawback of rutherford model |
| Answer» According to maxwell ,when charged particle accelerated then it looses its energy hence it falls into the nucleus ,therefore he fails to explain the stability of the atom.<br>He couldn\'t explain stability of atom<br>He didn\'t explain the hydrogen spectrum. | |
| 277. |
Is molecular mass i different from molar mass? |
| Answer» Yes it is different. Molecular mass is the mass of one molecule of an element while molar mass is the mass of one mole of an element. | |
| 278. |
How many g of Na2Co3 shold be dissolved to make 100cm3 of 0.15 molar Na2Co3 solution?With steps |
| Answer» 1000 cm3 of 0.15 M Na2CO3 contains Na2CO3 = 0.15 mol100 cm3 of 0.15 M Na2CO3 Will contain Na2CO3 =\xa0{tex}\\frac { 0.15 } { 1000 } \\times 100 = 0.015 \\mathrm { mol }{/tex}Molar mass of Na2CO3 = 2\xa0{tex}\\times{/tex} Na +1\xa0{tex}\\times{/tex} C +3 {tex}\\times{/tex}O =2 {tex}\\times{/tex}23 +1\xa0{tex}\\times{/tex} 12 + 3\xa0{tex}\\times{/tex} 16= 46 + 12 + 48 =106 g mol-1\xa0Therefore, Mass of Na2CO3 =Number of mole of\xa0Na2CO3\xa0{tex}\\times{/tex} Molar mass of Na2CO3 =\xa00.015 mole\xa0{tex}\\times{/tex}106 g/mol = 1.59 g. | |
| 279. |
Ch3 - ch2 - c --- ch |
| Answer» What you want???<br>But-1-yne | |
| 280. |
Practicals in 1st unit |
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| 281. |
rules for filling up of electrons in orbitals |
| Answer» There is one short trick to learn how fill all 4 orbital SSSP SPS (DPS)^2. infinte times(FPDS)Thats sitNow how to learn-SSP ne SPSe kha 2 times DPS ke bachhe infinite time FPDS(fail ho gaa)<br>Orbits are filled by using formula 2n^2 where n is 1, 2 ,3, 4<br>Affbaus principal : also called as chemistry Ki jalebi in my language<br>Hunds rule,pauli\'s exclusion,aufbau\'s principal<br>Fill the first shell with two electrons Then the 2nd shell with 8 electrons 3rd shell with 8 electrons 4th shell with 18 electrons 5th shell with 18 electrons And like that fill all | |
| 282. |
Calculate the number of protons neutrons and electrons in 85Br35 |
| Answer» Here, Z = 35, A=80{tex}\\therefore{/tex}\xa0No. of protons = Atomic no. = 35No. of electrons = No. of protons = 35No. of neutrons = A-Z= 80 - 35 = 45 | |
| 283. |
Who invented protons...??? |
| Answer» Rutherford discovered protons<br>Rutherford<br>E.goldstein<br>Goldstein<br>Goldstein was discovered prorons by the experiment of anode rays. | |
| 284. |
Calculate percentage of sulphur in sulphuric acid |
| Answer» 32.65℅by mass | |
| 285. |
If n=5, then how many electrons can have m=+1????? |
| Answer» M=+1,+2,+3,+4,-1,-2-,3,-4 or reverse it | |
| 286. |
To determine the change in pH value of acetic acid solution on addition of sodium acetate solution |
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| 287. |
Give some questions with answer based on law of multiple proportion |
| Answer» Law of multiple proportions (John Dalton 1804) states that when two elements combine to form two or more compounds, the weight of one of the elements which combines with a fixed weight of the other, bears a simple whole number ratio. For example, hydrogen and oxygen combine to form two compounds H2O (water) and H2O2(hydrogen peroxide). In water,\xa0Hydrogen 2 parts and oxygen 16 parts In hydrogen peroxide hydrogen 2 parts and oxygen 32 parts.The weights of oxygen which combine with same weight of hydrogen in these two compounds bear a simple ratio 1 : 2. Nitrogen forms five stable oxides:N2O Nitrogen 28 parts Oxygen 16 partsN2O2\xa0Nitrogen 28 parts Oxygen 32 partsN2O3\xa0Nitrogen 28 parts Oxygen 48 partsN2O4\xa0Nitrogen 28 parts Oxygen 64 partsN2O5\xa0Nitrogen 28 parts Oxygen 80 partsThe weight of oxygen which combines with same weight of nitrogen in the five compounds bear a ratio 16 : 32 : 48 : 64 : 80 : or 1 : 2 : 3 : 4 : 5. | |
| 288. |
Which is the best reference book of chemistry |
| Answer» Modern abc<br>Arihant all in one | |
| 289. |
Which of the following will have the minimum no. Of atoms:-(1) 1g Cl2(2) 1g Li(3) 1g Na(4) 1g Au |
| Answer» 10^10<br>(i) Gram atomic mass of Au= 197 g\xa0Or197g of Au contains = 6.022 x 1023\xa0Therefore 1gm of Au contains = 6.022 x 1023/197*1 = 3.06 x 1021\xa0atoms\xa0(ii) Gram atomic mass of Na = 23 gOr23 g of Na contains atoms = 6.022x 1023Or1gm of Na contains atoms = 6.022x1023\xa0/23 *1 = 26.2 x1021atoms\xa0(iii) Gram atomic mass of Li = 7Or7g of Li contains atoms = 6.022 x 1023Or1g of Li contains atoms = 6.022 x 1023/7 *1= 86.0 x 1021\xa0atoms\xa0(iv) Gram atomic mass of Cl = 71 Or 71g of Cl contains atoms = 6.022x1023Or1 g of Cl contains atoms = 6.022x1023\xa0/71 * 1= 8.48 x 1021atoms | |
| 290. |
Lab manual?? |
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| 291. |
Define dipole-dipole interaction |
| Answer» Dipole-Dipole interactions result when two dipolar molecules interact with each other through space. When this occurs, the partially negative portion of one of the polar molecules is attracted to the partially positive portion of the second polar molecule. This type of interaction between molecules accounts for many physically and biologically significant phenomena such as the elevated boiling point of water. | |
| 292. |
Can anybody explain molality |
| Answer» Question upload karo<br>But I found difficulty in numerical of morality and molality<br>It\'s ok no problem you are like my sister<br>Thank you so much<br>Number of moles of solute which is dissolved in 1kg or 1000g of solution is called molality.Its formula is , no. Of moles of solute/mass of solute in 1kg. | |
| 293. |
How to do numaricals of ch 1 easily |
| Answer» There is the whole numericals based on unit changing in chemistry so plz learn the unit values like pico,micro,mega etc.... then u will easily started solveing numericals fo ch1 | |
| 294. |
What is lattice gain enthelpy |
| Answer» The amount of energy required to completely separate one mole of the solid ionic compound into constituent gaseous ions is known as lattice enthalpy.Lattice enthalpy is a measure of the strength of an ionic compound.<br>The amount of energy which is required to remove one mole of any molecule is called lattice enthalpy | |
| 295. |
Classify Matter on the basis of physical state |
| Answer» Matter exist in three physical states : solid ,liquid and gas.<br>On the basis of physical state it can be classified as SolidLiquid GasPlasma Bose Einstein condensate | |
| 296. |
Write the difference between precision and accuracy |
| Answer» Precision means the closeness of various measurements for the same quantity. Accuracy is the agreement of a particular value to the true value of the result. | |
| 297. |
Project on wastage of solid and water disposal in village\'s for 11class |
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| 298. |
How many moles of dioxygen are present in 64 gram of dioxygen? |
| Answer» 2 moles | |
| 299. |
why water has maximum density at 4 degree centigrade |
| Answer» Water has maximum density at 40C because when temperature is increased from o to 40C, some of the H-bonds break and molecules come closer and density increases till 40C because volume decreases. But, above 40C, the kinetic energy of molecules increases which leads to increase in volume and density decreases. | |
| 300. |
If we say the 1 molar NaOH than it means of NaOH dissolve in one liter of solution |
| Answer» Nhi, one mole mtlb hota hai uss element ka atomic mass .Eg. NaOH , Na =23 and O =16 and H= 1.Then its atomic or molar mass of NaOH is 40. | |