Saved Bookmarks
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 line spectrum of hydrogen |
| Answer» The emission spectrum of atomic hydrogen is divided into a number of spectral series, with wavelengths given by the Rydberg formula. These observed spectral lines are due to the electron making transitions between two energy levels in an atom. | |
| 2. |
Why 2p is possible? |
|
Answer» Ok thanks for answer Ok Preet we are Friends now... Bbye yaar eet at 2 :15 Joy cheatted u Don\'t talk to him now...? Take care and be aware from these type of friends like joy &Ayush ....... they cheats Now bye we char at afternoon on 2:15 Yes i am a girl Don\'t worry Aditi we r friends from now bcoz i am a girl and i understand ur feelings Hey preet u r also a .......?? Yes u r right Aditi ??????????? Jagtar jao Joy ke sath see below chats they ar3 not friends they are cheaters....Especially Ayush Brother ????? Ete mean are Hi yuvika. Sister can we ete friend on this app Are u clear 2p is possible , 1p is not posible bcoz 1st orbit mein max 2 electrons hi reh skte hai wo s orbital fill kr deta hai |
|
| 3. |
Which two theory Dalton\'s could not explain? |
| Answer» the laws of chemical combinations , laws of gaseous volumes , reasons for combining atoms. | |
| 4. |
How is mole related to (a) no of atoms or molecules (b) mass of substance |
|
Answer» The mass of one mole of any atom/molecule is equal to its atomic molecular mass in grams.The molecular formula of water is H2O The atomic mass of H = 1The atomic mass of O = 16In a sense, the formula means H + H + O So... 1 + 1 + 16 = 18Therefore, the mass of one mole of water = 18 GramsThanks @diti? Avogadro\'s number is a proportion that relates molar mass on an atomic scale to physical mass on a human scale. Avogadro\'s number is defined as the number of elementary particles (molecules, atoms, compounds, etc.) per mole of a substance. It is equal to 6.022×1023 mol-1 and is expressed as the symbol NA.Thanks @diti? |
|
| 5. |
what is the difference between STP and NTP |
|
Answer» Harsh mishra u are from DAV? Hi pratik STP is Standard Temperature and Pressure, where temperature is taken as 273K(0 C) and pressure is taken as 1 atm(1 atmosphere).Whereas NTP is Normal Temperature and Pressure, where temperature is taken as the normal room temperature(about 28-30 C) and pressure is taken as 1 atm. Wow what a great answer these r the toppers HARSH MISHRA STP\xa0stands for Standard Temperature and Pressure.NTP\xa0stands for Normal Temperature and Pressure.STP\xa0is set by the IUPAC as 0°C and 100 kPa or 1 bar.Many old books and online sources say that standard pressure is 101.325 kPa (the old IUPAC standard that was changed in 1982), but It defer to the current IUPAC standard of 100 kPa.NTP\xa0is set at 101.325 kPa but uses 20°C as the temperature.Note:0°C = 273.15K20°C = 293.15KAt STP:\xa0Pressure = 1 bar = 0.987 atm Temperature = 273 K or 0°CAt NTP:\xa0Pressure = 1 atm Temperature = 293 K or 20°CAlso,1 atm = 1.013 bar1 atm = 76.0 cm1 atm = 0.760 mHere,cm = centimetrem = metreatm = atmosphere |
|
| 6. |
61.02 how many significant figure |
|
Answer» Absolutely 4 4 4 There are 4 significant figures Yes, there\'re 4 significant figures you\'n see the ncert too it\'s also given in it....???? 4 than @diti? It* Ut has 4 significant figures as zero between non zero digits is also significant 4 |
|
| 7. |
Hydrocarbons ka reaction |
| Answer» | |
| 8. |
How much hard will be numericals from ch 2 and easy explanition of atomic spectra |
| Answer» | |
| 9. |
please anybody send me the very short notes of the ch chemical bonding |
| Answer» You can check revision notes here :\xa0https://mycbseguide.com/cbse-revision-notes.html | |
| 10. |
Who discoverd electron? |
|
Answer» Narendra damodar modi J.J Thomson discovered electrin@diti? thomson E.goldstein J.J Thomson J.J Thomson |
|
| 11. |
Ctrl+Z |
| Answer» In most Windows applications, the Undo command is activated by pressing the Ctrl+Z or Alt+Backspace keybindings. | |
| 12. |
How electron distribution changes along the peroids |
| Answer» As we move left to right across a period the aptomic number of the elements increases . As ap result , in a period the electronic configuration mainly involve change in the valence shells . | |
| 13. |
What is water gas shift reaction\xa0 |
| Answer» Water-gas shift reaction :- The water-gas shift reaction is a chemical reaction in which carbon monoxide reacts with steam in the presence of a catalyst to form carbon dioxide and hydrogen. | |
| 14. |
Formula of calcium phosphate |
|
Answer» Ca2po4 Ca3(po4)2 |
|
| 15. |
why the videos are not in hindi language |
|
Answer» Use unacademy aap may be it is useful for u Because cbse deals with english only |
|
| 16. |
Relationship between kinetic energy and density |
| Answer» 2×KE = V×d×v^2 where V is volume , d is density and v is velocity.. | |
| 17. |
What are the drawbacks of rutherford model |
|
Answer» Another drawback... it says nothing about electronic structure of atom Major drawback.....according to rutherford\'s atomic model, electrons move at very high speed around nucleus. Btt according to electromagnetic theory of maxwell , if a charge particle undergoes accln , it emits radiation continiously. Applying this theory, calculation shows it will take only 10^-8 seconds to fall the electron on to the nucleus taking a spiral path which does not happen. In simple words u can say he didn\'t explain the stability of an atom . He does not give the max planck Quantum theory 1. He could not able to explain the stability of an atom. 2. He could not explain the line spectrum of hydrogen atom. |
|
| 18. |
How to find polarity.....? |
| Answer» Molarity or molality | |
| 19. |
Write the short note london dispersion force with a suitable diagram |
|
Answer» \tDispersion forcesor London forces refers to the attractive forces existing between the two temporary It was first proposed by a Germanphysicist Fritz London.\tThese forces are always attractive. Lodan dispersion Write the short note london dispersion force with a suitable diagram |
|
| 20. |
if the ionization energy of hydrogen atom is 160eV, find the shell having energy - 40eV |
| Answer» | |
| 21. |
A sample of pure water, whatever the source always contains........... By mass of hydrogen. |
|
Answer» nswer:A sample of pure water,whatever the source always contains 88.8% by mass of oxygen & 11.1%by mass of hydrogen.The total amount of percentage is 100, therefore they are divided in a constant ratio.H2O contains H and O in a fixed ratio by mass. It illustrates the law of constant composition or in other words law of conservation of energy. So, they are divided in a ratio of 1:8 therefore mass of Oxygen is 88.8%. 16 |
|
| 22. |
How many sigma and pie bond in C4H6, CH4, C2H6, C2H4, C3H8, C4H10, C8H16, C5H12 |
| Answer» | |
| 23. |
What is oxidation state of K And KO2 |
| Answer» The oxidation state of each oxygen atom is -1/2 since it is a superoxide ion.Let the oxidation state of K be x.x + 2(-1/2) = 02x-2 = 02x=2x=+1hence, oxidation state of k is\xa0+1 | |
| 24. |
what is lattice enthalpy |
| Answer» the lattice enthalpy of an ionic solid is defined as the energy required to completely separate one mole of a solid ionic gaseous constitution ions | |
| 25. |
Concentrated sulphuric acid |
| Answer» H2So4 | |
| 26. |
How to learn Chemistry easily |
|
Answer» By visualisation the the concept of chemistry Firstly throw the fear from ur mind out that chemistry is tough... Try to tell ur mind that it\'s too easy and then after sometime, of studying this subject by considering it easy, u will really feel that it\'s too easy.. ###the same happened with me too. I thought that physics Is a tough subject bt no.. When I started studying physics I realised, it is more easier than anything.. ##try this once.. U will surely get the results in ur favour.. Yaar concentrate and understand every concept seriously OK KEEP IT UP WITH CHEMISTRY By leaving it Don\'t try to learn it just try to leave it or simply understand the concept and then use that practically You can learn chemistry in a easy way by reading every concept clearly and take the help pf your teacher also Chemistry is learn by clear concept for every chaptres To learn chemistry ,first you have to like the both chemistry teacher and subject It is not easy to learn chemistry i hate chem.??? |
|
| 27. |
why anion is greater than cation |
|
Answer» Anion is negative charge which gain electron but cation loss elctron Becz Cation always loses electron.So the positive charge.thats why anion is greater than cation. Are u talking in terms of atomic radii..... Because anions are negatively charged whereas cations are positively charged.OKKKKKK |
|
| 28. |
Can u explain me MOT of oxygen |
| Answer» Molecularorbiral theory | |
| 29. |
If two moles of an ideal gas at 273°C occupy a volume of 44.8 litres, the pressure of the gas is |
|
Answer» Pressure of gas is equal to 768*2 According to the ideal gas laws, we have Pv = nRT • P = nRT/v P = 2 × 0.08 × 574 k (as 273K)P = 1.99 approx or you can write it as 2 atm |
|
| 30. |
The RMS velocity of an ideal gas at 27°C is 0.3m/s.Its RMS velocity at 927°C is (in m/s). |
| Answer» | |
| 31. |
What is hydrogen bond explain with example |
| Answer» The hydrogen make bond with FON this type of bonding is called hydogenbond And this bond is represent with dots( ........) | |
| 32. |
What is organic ? |
|
Answer» Organic chemistry means mainly studies of the carbon compounds Organic chemistry means obtained from food, living things |
|
| 33. |
Environmental chemistry |
| Answer» Environmental Chemistry is the branch of science/chemistry which deals with the chemical changes in the environment. It includes our surroundings such as air, water, soil, forest etc. It is science to understand environmental phenomenon. | |
| 34. |
Find the energy ratio of 2nd and 3rd electron of lithium ion |
| Answer» | |
| 35. |
Tell me important topics of ch 1 |
|
Answer» You can check on thishttps://mycbseguide.com/cbse-syllabus.html Molality /molarity/limiting reagent Can u also hepl in revising unit 2 of physics |
|
| 36. |
I want periodic table |
|
Answer» Just buy from the market only of 10 Rs Pragati what u want to know about the periodic table |
|
| 37. |
How can we find atomic number |
|
Answer» The total number of protons present in the nucleus of an atom represents the atomic number of a particular atom. Every atom of a particular element is composed of the same number of protons and therefore have the same atomic number. However, atoms of different elements have unique atomic numbers that vary from one element to the other. Number of proton is equal to atomic no |
|
| 38. |
What are the reasons for the failure of Bohr\'s model |
|
Answer» It was unable to explain the spectrum for atoms other than h atom or mulch electron atom 1. It fails to account for the finer detail of the H atom spectrum observed by using sophisticated spectroscopic techniques. The reasons of the failure of the Bohr\'s Model as a follows :.... 1. It fails to account for the finer details of the hydrogen atom spectrum observedby using sophisticated sepctroscopic techniques. 2. This model is also unable to explain the spectrum of the atoms other than hydrogen, for example helium atom which possesses only two electrons. 3. Bohr\'s theory was also unable to explain the splitting of spectral lines in the presence of magnetic field or electric field (Zeeman and stark effect). 4.It could not explain the ability of atoms to form molecules by chemical bonds. |
|
| 39. |
How many chapters are there for midterm exam going to held soon |
|
Answer» Tq for your advice Ask your school teacher |
|
| 40. |
What is nomenculture |
|
Answer» Method to give name to different organisms?????? by scientifically is called*nomenclature* The present scientific method of naming the microorganisms, protists, fungi,plant and animal is called nomenclature. |
|
| 41. |
Define electrovalence of an element |
| Answer» The number of electrons lost or gained by an atom in the formation of electrovalent bond is called its electrovalence . | |
| 42. |
Why there is fixed no of electrons |
| Answer» According to Bohr, the amount of energy needed to move an electron from one zone to another is a fixed, finite amount. These zones are known as energy levels (or sometimes called electron shells). Each of these orbitals can hold 2 electrons, so a total of 8 electrons can be found at this level of energy. | |
| 43. |
How this is solved:-log[H+] = –3.76 = `4.24 |
| Answer» | |
| 44. |
how to draw c2 molecule step by step?what is pi* bond and pi bond? |
| Answer» | |
| 45. |
What is energy of electron |
| Answer» 6.02×10 to the power _19 | |
| 46. |
Avogadro\'s number |
|
Answer» 6.022×10^23 6.023 × 10^23 |
|
| 47. |
Write the electronic configuration of O2-. |
|
Answer» 1s2 2s2 2p6 1s2 2s2 2p6 1s22s2p4 |
|
| 48. |
Compound of carbon C2H2 |
| Answer» C h | |
| 49. |
What is Hess\'s law ? |
| Answer» It states that the enthalpy change in a particular reaction is same whether the reaction takes place in one or a number of steps . | |
| 50. |
How to calculate of titration of naoh vs oxalic acid with solved example |
| Answer» Together with | |