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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. |
explain the character of wave |
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| 2. |
Ag107 and Ag109 Average atomic mass=108.5. Find % by mole of each isotope |
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Answer» No bro chemistry is too intresting if one can learn it with such intrest Let Ag107 and Ag109 available in x% and y% respectively. So,x + y = 100 .........(i)Now,(x × 107/100)+(y × 109/100) =108.51.07x +1.09y=108.5 ..........(ii)On multiplying (i) by 1.09 and subtracting (ii) from (i),we get0.02x = 0.5 ==> x = 25On putting x = 25 in (i), we gety = 75Percent of Ag107 =25%Percent of Ag109 =75% Hmmm wo tho hai hi Chemistry is too boring subj... |
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| 3. |
Calculate mole fraction in each component of20gm NaOH is mixed with 18gm H2O |
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| 4. |
Identify limiting agent 3A+2B+5C=2D+7E 10mole of a ;7moleofb;14moleofc |
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Answer» A=10/3=3.33 , B= 7/2=3.5 , C= 14/5=2.8Hence , C is the limiting reagent B is your ans. B |
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| 5. |
Why cathode rays produce only X rays ? |
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| 6. |
Unit of first order reaction. Explain |
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| 7. |
Which is the most important question of chapter 1 of chemistry |
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Answer» Matter theory, law of chemical combinations ,dalton atomic theory and modern theory molecular masses,mole concept , molality,molarity and normality . if u take best presentage this concepts are important Mole concept and all five laws given in ncert Mole concept |
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| 8. |
Which is the best unit of concentration -molarity or molality and why? |
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| 9. |
The ratio of sigma and pai bond in tetracyano ethylene |
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| 10. |
Best practical manual |
| Answer» Elite | |
| 11. |
Narendar avasthi bookquestion solution |
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| 12. |
How many molecule,atoms,electrons and protons in 16gram methane |
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| 13. |
How to convert cm inverse to meters?? |
| Answer» Firstly covert cm to meter in inverse then follow it by lyles inverse proportion rule/law | |
| 14. |
How does candela form the part of basic SI unit |
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| 15. |
What is succesive ionization enthalpies |
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| 16. |
What is exception of metal,non metal or metalloid? |
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Answer» Hydrogen Metals-Metals are usually solid but mercury is metal which is a liquid.According to the properties of metals, metals are hard but sodium and potassium is so soft that it can be cut with a knife.Nonmetals-Graphite is a nonmetal that can conduct electricity. (We generally know that nonmetals are insulators) |
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| 17. |
What is quantum numberd |
| Answer» Quantum numbers:\xa0Quantum numbers are numbers that designate and distinguish various atomic orbitals and electrons present in an atom.Four quantum numbers are used to define the state of an electron completely, namely principal quantum number, azimuthal quantum number, magnetic quantum number and spin quantum number. | |
| 18. |
What is the sequence of energies of 3s,3pand3d orbital in hydrogen atom and sodium ion |
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Answer» 3s 3p 3d 3s<3p<3d |
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| 19. |
Best refrence book for prepration |
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Answer» S chand For me its Pradeep and schand |
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| 20. |
If we take 2 apples, how many significant figures does it have? |
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Answer» 1 only Infinix |
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| 21. |
5 litre of 0.4M H2so4 contains |
| Answer» 2 moles | |
| 22. |
How many Milligrams of bromine are present in a bottle containing 1/10kg? |
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| 23. |
Definition of molarity |
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Answer» It is defined as the number of moles of solute dissolve in 1 litre of solution and molarity is represent by (M).. Molarity is a concentration unit, defined to be the number of moles of solute divided by the number of liters of solution. |
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| 24. |
Chemical formula of sodium |
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Answer» Na(11) Na Na |
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| 25. |
Calculate the molecular nmass of HNO 3 |
| Answer» We know, Atomic mass of H = 1.001 uAtomic mass of N = 14.01 uAtomic mass of O = 16.0 uHence, molar mass of HNO3 will be:{tex}( 1 \\times 1.001 ) + ( 1 \\times 14.01 ) + ( 3 \\times 16.0 ){/tex}= 63.01 u | |
| 26. |
Mole of electrons present in 9g aluminium is |
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Answer» Number of moles of 9 g of Al3+ ion = {tex}\\frac{9}{27}{/tex}(given mass/molar mass)Now, number of ions of Al3+ = {tex}\\frac 13 \\times 6.022 \\times 10^{23}{/tex}= 2.007\xa0{tex}\\times{/tex}\xa01023(number of ions/atoms/molecules=Avogadro\'s number*number of moles)Now, number of electrons in 1 ion of Al3+ = 10So, 2.007\xa0{tex}\\times{/tex}\xa01023 ions will have 2.007\xa0{tex}\\times{/tex}\xa01023{tex}\\times{/tex}\xa010 = 2.007\xa0{tex}\\times{/tex}\xa01024\xa0 electrons. Hi Esha Pal Hlo amira Its ans is 4.33 but i donot know how |
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| 27. |
Maxwell model of atom |
| Answer» Maxwell model of atoms | |
| 28. |
What hydorgen |
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Answer» Element persent in s block Element 1st member of sblock Eliment It\'s an element |
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| 29. |
What is dative bond? |
| Answer» An example of a dative covalent bond is provided by the interaction between a molecule of ammonia, a Lewis base with a lone pair of electrons on the nitrogen atom, and boron trifluoride, a Lewis acid by virtue of the boron atom having an incomplete octet of electrons. | |
| 30. |
Ncert solution of ch2 |
| Answer» Check NCERT solutions here :\xa0https://mycbseguide.com/ncert-solutions.html | |
| 31. |
what is difference between electron gain enthalpy and electronegativity |
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Answer» For detail answer see in the book modern\'s abc chemistry part 1 chapter3 Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons. The Pauling scale is the most commonly used. While Electron gain enthalpy is defined as the amount of energy released when an electron is added to an isolated gaseous atom. During the addition of an electron, energy can either be released or absorbed.Sign Convention For Electron Gain Enthalpy:Negative: When energy is released while accepting an electron.Positive: When energy is supplied to an atom while adding an electron |
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| 32. |
What is bond angle qnd formal charge |
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| 33. |
De brogile equation |
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Answer» Hello bro.please dont mind you have many sources of education .so if you any problem / doubt related to your study then can search in google ,youtube ....you will get instant answer then why are you ask question here which takes lots of time to get answer Wavelength=h/mv=h/p where h is Planck\'s constant, p is momentum Wavelength= h/mv |
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| 34. |
Compare the strength of 1M and 1m aqueous solution of glucose.(density of water is 1 g/ ml). |
| Answer» A\xa01 molar solution\xa0is a\xa0solution\xa0in which\xa01\xa0mole of a compound is dissolved in a total volume of\xa01\xa0litre.Molality, also called\xa0molal concentration, is a measure of the concentration of a solute in a\xa0solution in terms of amount of substance in a specified amount of mass of the\xa0solvent.1 molar aqueous solution is more concentrated than 1 molal aqueous solution .1 molar solution contain 1 mole of solute in 1 litre of the solution which include both solute and solvent. | |
| 35. |
Convert 2 M H2SO4 into g/L. |
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| 36. |
What is electromagnetic waves and what is the main characteristics of electromagnetic waves? |
| Answer» Electromagnetic waves\xa0are waves that are created as a result of vibrations between an electric field and a magnetic field.Characteristics of electromagnetic waves:\tElectromagnetic waves are produced by accelerating or oscillating charge.\tE.M. waves do not require any material medium for their propagation.\tE.M. waves travel in free space with a velocity {tex}C = \\frac{1}{{\\sqrt {{\\mu _0}{\\varepsilon _0}} }}{/tex}\xa0which is equal to the velocity of light {tex}(c = 3 \\times {10^8}m/s){/tex}.\tE.M. waves are transverse in nature. | |
| 37. |
Why electron gain enthalpy of metal is low while of non metal is high |
| Answer» Because metal can easily lose electron as compared to non metals | |
| 38. |
Whats are atom |
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Answer» Atoms are those particle or element which can no be divisible Atom is pure form of elements consist of same element. Eg.ca atoms consist only calcium as element. |
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| 39. |
We can get 2nd hand refresher |
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| 40. |
What is the molar mass of naoh |
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Answer» 23+16+1=40g 98 |
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| 41. |
Calculate energy of a photon having frequency 1000HZ |
| Answer» E=hc/(lamda) | |
| 42. |
Write the Hybridisation of iodidehepthafluoride |
| Answer» It\'s hybridization is sp3d3 with pentagonal bipyramidal geometry. | |
| 43. |
what are the formulas used in structure of an atom? |
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| 44. |
explain the borhs model of hydrogen atom |
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| 45. |
How we calculate atomic mass of elements |
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Answer» If isotopes are given then sum of (product of all isotope\'s abundance in the nature with their respective atomic mass) / ? Number of protons + number of neutrons |
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| 46. |
Calculate the atomic mass of magnesium |
| Answer» As the abundance of mg 23.9 isotope is the greatest among three isotopes hence its near to that which is 24.30Use formula sum of all three isotope abundance * atomic mass /100 | |
| 47. |
Rada bought 20note books how may significant figures are there |
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Answer» 2 Infinte as its a exact number hence infinite number of 0\'s can be added after decimal20.000000000000000000000 and so an 2 2 2 |
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| 48. |
Calculate the shortest wavelength in helium spectrum of lyman series |
| Answer» Lyman series, n = 2, 3, 4... to n= 1For short wavelength, n ={tex}\\infty{/tex}\xa0to n = 1we know that ,\xa0{tex}E = \\frac { 12375 } { \\lambda ( \\mathop A\\limits_{}^o ) } = \\frac { 12375 } { 9134 } \\mathrm { eV } = 13.54 \\mathrm { eV }{/tex}Energy of nth\xa0orbit, E = 13.54/n2So, energy of n = 1, energy level = 13.54eVEnergy of n = 2, energy level= 13.54/22 = 3.387 eVSo, short wavelength of Balmer series =\xa0{tex}\\frac { 12375 } { 3.387 }{/tex}\xa0= 3653\xa0{tex}\\mathop A\\limits_{}^o {/tex} | |
| 49. |
(2.5×10^-2)-(4.8×10^-3) |
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Answer» 245.2×10 to the power -3 10^-2(2.5-4.8×10^-1)=10^-2(2.5-4.8/10)=10^2(2.5-0.48)=10^-2(2.02)=2.02×10^-2 |
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| 50. |
Is 2d possible |
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Answer» No because in 2d , n=2 and l =0,1. But for d orbital l= 2 ...but 2 doesn\'t appear in the above so 2 d orbital doesn\'t exist No |
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