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This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
What is photoelectric effect? Explain it on the basis of quantum theory. |
| Answer» It is a phenomenon in which light of suitable frequency strikes on metal surface to ejects the electrons from metal surface | |
| 2. |
Tips for styding plźzźźzzz |
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Answer» Revise ur school work dailyDo seld studyat least 3 hrRevise n repeat ncertSolve as many question as u can from exemplar after doing ncert Do self study |
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| 3. |
What amount of CO2 is formed when 2 gram of carbon react with 8 gram of dioxygen |
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| 4. |
What is covalent bind? |
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Answer» Jagtar mistri is wrong statement this stat. Of electrovalent {according to class 11th}The writhe stat. Is "the distance b/w two non metals atom is half of from there nucleas"this is called covalent bond.{according to ncert of class 11th} What formal charge? When two atoms share one electron pair they are said to be joined by a covalent bond. Ok baby |
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| 5. |
Give some examples of matter that are not materials |
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| 6. |
I\'m not able to understand 1st part 1st chapter |
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| 7. |
How to calculate the number of subshells in an element |
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Answer» But how 4s,p,d and f. |
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| 8. |
Derive empirical formula and molecular formula |
| Answer» The empirical formula of a compound is related with its molecular formula as ,Molecular formula = (Empirical formula)n\xa0,where, n is positive integer. | |
| 9. |
Why the energy levels are also known as satationary |
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Answer» Because they are fixed value ,never be changed Kya pata |
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| 10. |
Account for the fact that the 4th period has eighteen and not eight elements. |
| Answer» Answer on the basis of n value and l value and refer ncert example | |
| 11. |
What is the formula of rydberg |
| Answer» The Rydberg formula is {tex}E = {E_0}{Z^2}\\left[ {\\frac{1}{{n_1^2}} - \\frac{1}{{n_2^2}}} \\right]{/tex}\xa0 | |
| 12. |
Explain bond pair |
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| 13. |
What are lone pairs |
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| 14. |
The hydrocarbon contains 79.8% carbon and 20. 30% of hydrogen what is its empirical formula |
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Answer» Ch3 CH3 |
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| 15. |
What is the actual meaning of nuclear charge |
| Answer» It means positive charge on nucleus due to protons so as atomic no. Increases nuclear charge increases due to increase in no. Of protons....hope this will help u | |
| 16. |
Shells |
| Answer» An electron shell, or a principal energy level, may be thought of as an orbit followed by electrons around an atom\'s nucleus. | |
| 17. |
Chemical balance |
| Answer» What u want to know..? About how to balance equation or why it is important to balance an equation.......? | |
| 18. |
Azimuthal quntam number |
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Answer» It tell no.of sub shelland denoted by ( \'l\' ) It give idea about the shell Eg..4d so d belong to 2 shell so azimuthal quantum no is 2 It give idea to the no. Of subshell Q no. Which give idea about subshell |
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| 19. |
Structure of atoms... discovery of neutrons notes |
| Answer» Check revision notes here :\xa0https://mycbseguide.com/cbse-revision-notes.html | |
| 20. |
Which book we will study to gain better marks in chemistry ... |
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Answer» I think you should prefer GRB chemistry Modern\'s abc |
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| 21. |
How to choose parent chain? |
| Answer» IUPAC naming? | |
| 22. |
What is black hole radiation |
| Answer» Energy is emitted or energy is absorbed by a black body radiation it mean black body is perfect emitter or absorber | |
| 23. |
Is solubility of lithium sodium potassium rubium cesium possible with chlorine?? |
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| 24. |
What is the effect of temperature on solubility product? |
| Answer» More the temperature more will be the solubility of substance . But to a limit. | |
| 25. |
Express 6.54ml in S.I base units using power of 10 notation |
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| 26. |
What is threshold energy |
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Answer» It is a minimum frequency responsible for the ejection of the electrons in photoelectric effect. OK Lowest amount of energy required by the object or organism or particle |
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| 27. |
Is ncert questions enough for the 1st chemistry chap. of class 11 for the school level exam?? |
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Answer» No you must try other best book of chemistry I think yes Ni toh hazaroo book hai sb book se banoyo agar time hai toh Yes much for that No..you must try more numericals from reference books |
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| 28. |
I got 15 marks out of 20 in chem class test pls give me some suggestion to improve my marks |
| Answer» You should study and work hard.. | |
| 29. |
How to study score good marks in chemistry |
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Answer» And understand by theory and numerically Pay attention Study daily.make notes.highlight important points.study from physics wallah on YouTube. By constant revision of topics |
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| 30. |
Write the electronic configuration of following with unpaired electron .(1). Cu |
| Answer» 1s2 2s2 2p6 3s2 3p6 4s1 3d10 Unpaired electron is 1 | |
| 31. |
Write the all quantum no. of last electron of K atom. |
| Answer» principal quantum no.(n) = 4, azimuthal quantum no. (l)=3, magnetic quantum no.(m)=-3,-2,-1,0,1,2,3. , spin quantum no. = 1/2. | |
| 32. |
What are the wavelengths of two longest line (in nm) in Lymington series of Hydrogen atom |
| Answer» According to Rydberg Balmer equation{tex}\\frac{1}{\\lambda}{/tex} = {tex}R\\left[\\frac{1}{n_{1}^{2}}-\\frac{1}{n_{2}^{2}}\\right]=R\\left[\\frac{1}{1^{2}}-\\frac{1}{n_{2}^{2}}\\right]{/tex}The wavelength {tex}(\\lambda){/tex}will be longest when n2\xa0is the smallest i.e. n = 2 and 3 for two longest wavelength lines.For : n2 = 2 ,\xa0{tex}\\frac{1}{\\lambda}=\\left(1.097 \\times 10^{-2} \\mathrm{nm}^{-1}\\right)\\left[\\frac{1}{1^{2}}-\\frac{1}{2^{2}}\\right]{/tex}{tex}\\left(1.097 \\times 10^{-2} \\mathrm{nm}^{-1}\\right) \\times \\frac{3}{4}=8.228 \\times 10^{-3} \\mathrm{nm}^{-1}{/tex} or {tex}\\lambda=121.54 \\mathrm{nm}{/tex}For: n2 = 3; {tex}\\frac{1}{\\lambda}=\\left(1.097 \\times 10^{-2} \\mathrm{nm}^{-1}\\right){/tex}= {tex}\\left(1.097 \\times 10^{-2} \\mathrm{nm}^{-1}\\right) \\times(8 / 9)=9.75 \\times 10^{-3} \\mathrm{nm}^{-1}{/tex}; {tex}\\lambda=102.56 \\mathrm{nm}{/tex} | |
| 33. |
Calculate the no of moles of 5.68 gm of iron |
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| 34. |
Cal. The velocity of an electron in bohr\'s first orbit of Hydrogen atom |
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| 35. |
State octet rule |
| Answer» Do you mean by lewis octate if that, it is every element have to complete 8 electrons in its outermost shell and for it can lose gain or sharr electrons | |
| 36. |
Dicuss the factors on which electron gain enthalpy depends |
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Answer» Factors on which electron gain enthalpy depends:Atomic size. As the size of an atom increases, the distance between its nucleus and the incoming electron also increases. Therefore, the force of attraction between the nucleus and the incoming electron decreases and hence the electron gain enthalpy becomes less negative.Nuclear charge.\xa0As the nuclear charge increases force of attraction for the incoming electron increases and thus electron gain enthalpy becomes more negative.Symmetry of electronic configuration.\xa0Elements having symmetrical configuration (Either half filled or fully filled orbitals in the same sub shell) having no attraction for electron because by accepting electron their configuration becomes less stable. In that case energy has to be supplied to accept electron. Thus electron gain enthalpy will be positive. 1. Atomic size. 2. No. Of valence electrons. |
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| 37. |
What is molality ? |
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Answer» Molality is also known as Molal Concentration and It is one measue for Solute concentrationMolality is defined as the number of moles of solute dissolved per 1000 g (1 kg) of solvent. Molality is expressed as \'m\'unit = Moles kg-1m = no of moles of solute /weight of solvent(kg)\xa0 It is the number of moles of solute present in 1 litre of solution.It\'s formula is :- mass of solute / it\'s molar mass × volume of solution.It\'s unit is mol/litre I.e., mol per litre. If liked my answer then please give Thanks. |
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| 38. |
Why the physical and chemical properties are same in a group? |
| Answer» There are 18 groups in periodic table & each group is a independent group. All the elements present in a group have same electronic configuration of the atoms. The physical and chemical properties of elements depend on the number of valence electrons. Elements present in the same group have the same number of valence electrons. Therefore, elements present in the same group have similar physical and chemical properties | |
| 39. |
Yellow light emityed |
| Answer» | |
| 40. |
What is a instantaneous dipolar molecule. |
| Answer» They are dipoles that only last for an instant and then they are gone. They are caused by the shaking and bending of molecules where every now and then, the electrons are located off to one side a bit, which makes for a dipole to exist. | |
| 41. |
Thanks for helping in my problems Happy friendship day to all |
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| 42. |
balancing methods |
| Answer» 1)Hit and trial methods.... 2) Partial equation method.... 3) Oxidation number method.... 4) Ion exchange method.... | |
| 43. |
Is molarity=density /molar mass |
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Answer» Accha baccha Ayush is right Yes becauseM=G*1000/M*V in mlAnd density mass /volume SO G*1000/V =densityRemains Mass SO formula = M=density/molar mass No..Molarity= no. of moles of solute/solution in 1L |
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| 44. |
How many moles of methane are required to produce 22 g co2 after combustion |
| Answer» 1/2 mole of CH4 is required to produce 22g of co2. | |
| 45. |
What is extrapolation |
| Answer» In mathematics, extrapolation is the process of estimating, beyond the original observation range, the value of a variable on the basis of its relationship with another variable@diti? | |
| 46. |
What are supplementry units And prefixes? |
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| 47. |
Who discovered by atom |
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Answer» John Dalton Democritus . |
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| 48. |
Who discovered proton? |
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Answer» E goldstein Rutherford Rutherford discovred yhe protons.??? Rutherford discovered protons@diti? Rutherford is correct Rutherford Mia Gold stin Some says Goldstein???? Rutherford |
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| 49. |
What is s block |
| Answer» The\xa0s-block\xa0elements share electron configurations.\xa0s-block\xa0elements are the elements found in\xa0Group\xa01 and\xa0Group 2\xa0on the periodic table. ...\xa0Group 2\xa0is the alkali earth metals which have\xa0two\xa0valence electrons, filling\xa0their s\xa0sub level. Because they have\xa02\xa0valence electrons they are less reactive than\xa0group\xa01.The\xa0s-block elements\xa0include hydrogen (H), helium (He), lithium (Li), beryllium (Be), sodium (Na), magnesium (Mg), potassium (K), calcium (Ca), rubidium (Rb), strontium (Sr), cesium (Cs), barium (Ba), francium (Fr) and radium (Ra). The periodic table shows exactly where these\xa0elements\xa0are within the\xa0s-block. | |
| 50. |
What is AZT and write its uses? |
| Answer» Full form is : Azidothymidine and it is used for helping AIDS patients | |