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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. |
How to get H and O gas in compound of H2O |
| Answer» Use electrolysis of brine | |
| 2. |
Basic medium reaction of cl 207 + H2O to give it to c l o 2 - + O2 |
| Answer» | |
| 3. |
Derivation of de-broglie equation? |
| Answer» De-broglie derived an expression relating the mass of such smaller particles and its wavelength. Plank\'s quantum theory relates the energy of an electromagnetic wave to its wavelength or frequency. λ=hmv = hmomentum, where \'h\' is the plank\'s constant. | |
| 4. |
which one is having higher energy last e of Cl minus or last e of O^-2 |
| Answer» | |
| 5. |
To analyse one cation,one anion from a given salt NH4CL |
| Answer» Very good | |
| 6. |
write electronic configuration of iron (fe: at. no. 26)? |
| Answer» Therefore the Iron electron configuration will be 1s22s22p63s23p64s23d6. | |
| 7. |
How to calculate enthalpy |
| Answer» Use the\xa0formula\xa0∆H = m x s x ∆T to solve.Once you have m, the mass of your reactants, s, the specific heat of your product, and ∆T, the temperature change from your reaction, you are prepared to\xa0find\xa0the\xa0enthalpy\xa0of reaction. Simply plug your values into the\xa0formula\xa0∆H = m x s x ∆T and multiply to solve. | |
| 8. |
Why TlCl is more stable then TlCl3? |
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Answer» Due to inert pair effect , thaillium is more stable in +1oxidation state than +3oxidation state Due to inert pair effect, thallium has oxidation state of +1, and not +3 as compared to other group - 13 elements. |
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| 9. |
Draw the resonance structure for CH3-O-CH2 |
| Answer» Their is no resonance because pie bond is absent | |
| 10. |
Why bf3 is electro deficience |
| Answer» BF3 is an electron deficient, because in this compound the central atom (B) Boron cannot complete it\'s octet of total 8 Electrons.... Boron in this compound have only 6 electrons........ This the whole BF3 compound is known as Electron deficient... ???Hope it will help u | |
| 11. |
Show the reaction of HCLPlease |
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Answer» HCl+NaOH-----NaCl+H2O NACL + H20 ----> HCL + NA2O |
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| 12. |
Write M.O.I for o2 |
| Answer» | |
| 13. |
Write M.O.I for O2+ and O2- |
| Answer» | |
| 14. |
If wood is burnt in air which is a limiting reagent in this case ?a) oxygen,wood,co2,water |
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Answer» Because wood burunt completely Wood |
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| 15. |
CH4 can\'t be written as H4C , WHY ? ? ans me plz |
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Answer» Since its more convenient to use and C have alphabetically lesser position than H As the no. Of atom in each element are almost same therefore they can be return in reverse form |
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| 16. |
Explain why cations are smaller and anions are larger in radii than their parent atom. |
| Answer» it is so because of no. of charge present in it. for eg :O^+2 has 14e^- because = 16e- of O2 and +2 present on it gives us 14e- . | |
| 17. |
explain the shape of BCl3, CH4, PCl5 on the basis of vsepr theory |
| Answer» | |
| 18. |
Nitrogen molecules and molecular diagrams,,??? |
| Answer» | |
| 19. |
Methane cannot be prepared by kolbe electrolysis |
| Answer» | |
| 20. |
HOW to convert Pent-2-yne to Pentan-2-one |
| Answer» | |
| 21. |
Convert ethyne to but-2-ene |
| Answer» This reaction involves two steps :Step 1 : When the terminal ethyne react with the sodamide to give acetylides.Step 2 : When acetylides react with haloalkane (ethylchloride) to give but-1-yne as higher alkynes. | |
| 22. |
Why H2O have bent shape |
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Answer» Apna kam kar lode Because O has 2 lone pairs which doRepulsion among themWhich cause the H²O to have a bent shape |
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| 23. |
Give the geometry of XCo3 and Brf5 |
| Answer» The geometry of BrF5 is octa hedral | |
| 24. |
Explain rules of Kabaddi |
| Answer» \tThe team that wins the toss shall have the choice of the court of the raid. In second half the court shall be changed.\tOpponents must have 5 players to avail the bonus points. If a player is out of court due to some technical or punishment reason he/she will be included in 5 players.\tA raider shall speak soundly ‘kabaddi kabaddi’ in the opponent court. After this, he must return to his court immediately.\tWhen entire opponent team is out and no one of the opponents is entitled to be revived, they shall score a ‘lona’ and 2 points shall be awarded.\tNails of the players should be properly manageable.\tMaximum of three players can generally be substituted with the permission of referee during the game.\tAny player can use lobby only during the struggle. If anyone uses lobby otherwise, he will be declared as ‘out’.\tRubbing of oil, cream, or wearing of soft material on body is not permitted.\tIt is compulsory to cross the baulk line by every raider. If a raider does not cross the baulk line he/she will be declared as ‘out’. | |
| 25. |
How will you form benzene from butanoic acid |
| Answer» | |
| 26. |
Main concepts of Quantum mechanical model |
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Answer» Quantum mechanical model:\tThe energy of an electron is quantized i.e. an electron can only have certain specific values of energy.\tThe quantized energy of an electron is the allowed solution of the Schrödinger wave equation and it is the result of wave like properties of electron.\tAs per Heisenberg’s Uncertainty principle, the exact position and momentum of an electron cannot be determined. So the only probability of finding an electron at a position can be determined and it is |ψ|2 at that point where ψ represents the wave-function of that electron.\tAn atomic orbital is the wave-function (ψ) of an electron in an atom. Whenever an electron is described by a wave-function, it occupies atomic orbital. As an electron can have many wave-functions, there are many atomic orbitals for the electron. Every wave-function or atomic orbital have some shape and energy associated with it. All the information about the electron in an atom is stored in its orbital wave function ψ and quantum mechanics makes it possible to extract this information out of ψ.\tThe probability of finding an electron at a point within an atom is proportional to the square of the orbital wave function i.e., | ψ | 2\xa0at that point. | ψ |2\xa0is known as probability density and is always positive. Yes |
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| 27. |
Crystalline solid? |
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Answer» Don\'t no Solid in tiny crystal like partical is known as crystalline solid |
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| 28. |
3 phenyl pent-1-ene |
| Answer» | |
| 29. |
Which is the easiest and hardest ch here |
| Answer» Asked ur teachers! | |
| 30. |
Suggest me the best teacher for chemistry please |
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Answer» Physics Wallah - Alakh sir Physics wallah Alakh pandey is the best teacher "gravity circle" is a YouTube channel where \'MRITUNJAYPANDYA19\' sir teach chemistry very smoothly and understandale .. you should check out and take one class.. |
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| 31. |
3×10ki power 8 /5×10ki power 9 How to solve this eqn..... My answer is wrong Please tell me |
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Answer» Solve this by equilisation method new method your answer is 0.06// @Aditya-It is also wrong 3 * 10^8/5 * 10^9 = 3/5 * 10^8 * 10^-9 = 0.6 * 10^-1 = 0.06.// |
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| 32. |
give the difference in the origin of cathode and anode rays |
| Answer» Cathode rays originate from the cathode whereas anode rays are not produced from the anode. They are produced from the gaseous atoms by knock out of the electrons by high speed cathode rays. | |
| 33. |
Convert 24 days into seconds |
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Answer» 2073600 sec 2073600 2073600 sec. 2073600 |
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| 34. |
Explain difference in precision and accuracy. |
| Answer» Accuracy indicates how near the measurements obtained experimentally are to the true value. Whereas precision indicates how near two measurements, whether theoretically or experimentally obtained, are to each other. | |
| 35. |
Chemistry mein kuch samajh nahi aa raha hai.....koi batado kaise phado is subject ko....please |
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Answer» Padhai karte rahein all the very best ? Ary kuch nahi bas ap chapter ko 2ya 3times pdlo only and only ncert then make a mind mape and paste it on your study table then may you understand the chemisrty Hope you like this ? Arey kuch nhi hai bas aap ch ko 2, 3 times padho or fir ek youtube channel hai physicswallah bo chemistry ke ch bhi padhata hai to aap vaha se padh lo?? Don\'t worry "Mary Stuart " meri bhi problem aisi hi thi par ye isiliye hota h kyuki hamare basics clear nhi hote isiliye iss may month mai sabse pehle apne basics clear karo Lunch meat Karen Sarah kar |
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| 36. |
Calculate normality of 500 ml h2so4 solution prepared by dissolving 49 g h2so4 |
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Answer» N = M * n-factor 1M * 49So N = 49//* represents ✖ multiply Normality = M * n-factor = Normality = mass of solute (in gms) / volume of solution (in litres) = 49/0.5 = 490/5 = 98// Gk knockdown juddhaporadhider sidebar supply try IV on PC ty ty ty ty ty ty ty ty ty ty ty |
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| 37. |
Find the molar mass of manganese IV oxide |
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Answer» The molar mass of manganese oxide is 36.9368g mol 86.9368g/mol |
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| 38. |
equivalent weight of metal is 12 . weight of its chloride is |
| Answer» 24 | |
| 39. |
Calculate weight of hydrogen gas produced when 85gm of NH3 is heated |
| Answer» Molar mass of NH3=17 gmIn 17gm of NH3=3gm of hydrogenIn 85gm ofNH3=? 85×3÷17=15 gm | |
| 40. |
Atomic number of rb is less than that of |
| Answer» Rubidium is the chemical element with the symbol Rb and atomic number 37. | |
| 41. |
Calculate mass of CO2 containing same number of oxygen atoms as in 3 g of NO |
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Answer» molar mass of CO2=44gmolar mass of NO =15gno of molecules in 15 g NO= NAno of molecules in 3g of NO=(3/15)NAgiven, molecules in 3g of NO=molecules in m g of CO2m/44×NA=3/15×NAm=3×44/15=8.8g of CO2 wow |
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| 42. |
A jug contain 2l of milk calculate the volume of the milk in m3 |
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Answer» 2*10^-6m^3 2*10^-6m^3 |
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| 43. |
1 mole is called |
| Answer» 1 mole is the amount of substance which has a mass equal to 1 g ie, the mass of 6.022 * 10^ 23 elementary entities. In a gas, 1 mole volume is equal to 22.4 l. | |
| 44. |
Discuss modern atomic theory.why it is better than Delton\'s atomic theory? |
| Answer» To describe the structure of atom and laws of chemical combination, Dalton’s Atomic Theory was put forward. According to this theory, matter is made up of small particles called atoms which are indivisible and indestructible. Atoms of same element are identical in shape, size, mass and chemical properties but the properties are different for atoms of different elements. They react with each other in different ratios (in simple whole number ratios) to form compounds or molecules.This theory has some limitations like1) It can explain the laws of chemical combination by mass but not by gaseous volumes.2) it cannot explain why atoms of different elements have different properties.3) Why atoms of different elements combine to form molecules?4) What is the nature of binding forces that exist between atoms and molecules to form three states i.e. solid, liquid and gases?To explain all above points modern atomic theory was introduced. According to this theory-1) Atom is not indivisible as it is not the smallest particle. It is made up of electrons, protons and neutrons.2) Atoms of different elements may have same atomic masses. Such atoms are called isobars.3) Atoms of same element may have different atomic number. These atoms are called isotopes.4) Atoms of different elements may react with each other in integral ratios also. It is not necessary to react in simple whole number ratios to form compounds or molecules.5) Atoms are not indestructible. Atom of one element can be changed into another.Because of all these explanations that modern atomic theory can give, it is better than Dalton\'s Atomic theory. | |
| 45. |
What are the two things in this universe that don\'t participate in chemistry? |
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Answer» They are results of NUCLEAR reactions, not chemical ones. And heat from the sun. Then, it might be sunlight. Time is a fundamental (physical) quantity which we study in chemistry. Space also contains chemistry because it contains complex chemical compounds and some gaseous molecules (like H2O) and hydrogen and dust particles. Space and time, I believe. |
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| 46. |
Draw the Lewis structure for the following molecules and ions |
| Answer» | |
| 47. |
Al4C3 + H2O ----->KCL + Mncl2 + H2O + Cl2 |
| Answer» | |
| 48. |
find the number of atoms of each type present in 3.42 g of cane sugar c12 h22 o11 |
| Answer» Molar mass of C12H22O11 = 342 g. Given mass = 3.42 g. No. of atoms of C = 12 × 6.022 × 10^23 × 3.42/342 = 12 × 6.022 × 10^23 × 10^-2 = 72.264 × 10^21 atoms. // Similarly, find H and O atoms also. | |
| 49. |
if the error in position of an element is 1.1 and strong find error in measurement of momentum |
| Answer» | |
| 50. |
Why does chlorine has more election gain enthalpy than fluorine |
| Answer» Though both fluorine and chlorine have same number of valence electrons, due to smaller valence orbital size of fluorine, the electron density in valence orbital is greater in fluorine than in chlorine. So, more effort would be required to insert a new electron in fluorine than in chlorine. So, chlorine has more negative electron gain enthalpy than in fluorine. | |