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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 hydrogen spectrum with the help of bohrs theory write the advantages and disadvantages |
| Answer» Bohr Model of HydrogenThe simplest example of the Bohr Model is for the hydrogen atom (Z = 1) or for a hydrogen-like ion (Z > 1), in which a negatively-charged electron orbits a small positively-charged nucleus. Electromagnetic energy will be absorbed or emitted if an electron moves from one orbit to another. Only certain electron orbits are permitted. The radius of the possible orbits increases as n2, where n is the principal quantum number. The 3 → 2 transition produces the first line of the Balmer series. For hydrogen (Z = 1) this produces a photon having wavelength 656 nm (red light).Problems with the Bohr ModelIt violates the Heisenberg Uncertainty Principle because it considers electrons to have both a known radius and orbit.The Bohr Model provides an incorrect value for the ground state orbital angular momentum.It makes poor predictions regarding the spectra of larger atoms.It does not predict the relative intensities of spectral lines.The Bohr Model does not explain fine structure and hyperfine structure in spectral lines.\xa0 | |
| 2. |
What is the colour of ray which emarge form cathod ray disharge tube |
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| 3. |
explain hydrogen spectrum with the help of bohrs theory |
| Answer» | |
| 4. |
Why carbon cannot form 4 bonds with other carbon atom |
| Answer» Electron affinity of carbon is not enough to gain electrons. It\'s size is small to lose electrons .Also it\'s electronegativity is is not sufficient to attract electrons. | |
| 5. |
What is psi? |
| Answer» Wave function is denoted by psi. Psi it self has no physical significent to the probability of finding an electron at any point. | |
| 6. |
Class 9 Atoms and molecules assignment |
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Answer» It is class 11 or agar 9th ka chahiye to 9th class fill karke .....is app par mil jaayega Ninth ka le kr kya krna hai |
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| 7. |
What is numerical What is displacement |
| Answer» 56Yi | |
| 8. |
Explain how boiling point is related to its vapour pressure? |
| Answer» Boiling point is a temperature from which vapour pressure of liquid turns into atmospheric pressure . More of vapour pressure leads to less boiling point and more of boiling point leads to less vapour pressure . Through this statement we can say that they are related to each other. | |
| 9. |
Define covalent radius |
| Answer» It is the measure of an atom that forms one covalent bond it is measured by picometers pm | |
| 10. |
Define bondlength |
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Answer» In molecular geometry, bond length or bond distance is the average distance between nuclei of two bonded atoms in a molecule. It is distance between the centres of two covalently atoms.it is determined by the number of bonded electrons. |
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| 11. |
What is ferromagnetism |
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Answer» Ferromagnetism is the basic mechanism by which certain materials form permanent magnets, or are attracted to magnets. These are those substances which are attracted everystrongly by a magnetic field. |
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| 12. |
why is the energy of electron is regarded as zero to negative |
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Answer» When electron is at infinite distance from nucleus,its energy is zero. When it is brought near to the nucleus, energy becomes less than zero, i.e., negative due to force of attraction between nucleus it is taken as negative because at infinite distance from the nucleus the electron\'s kinetic energy is not calculated.. that\'s why it\'s taken as zero... nd when this electron comes near to the nucleus the stability increases due to loss of energy of electron.. as a result energy of electron becomes less negative... hence we take electron\'s energy as negative. |
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| 13. |
Liquid drops tend to attain spherical shape . Give reason |
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Answer» Surface tension Because of surface tension |
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| 14. |
There is no solid state chapter in this app |
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Answer» Hai cbse class 12 mai setting karo aur chem. Ka 1 chap. Ka pdf download karke padho Hoga bhi kaise,... Essi Saal toh introduce kiya hai |
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| 15. |
2 g of NaOH are dissolved in water to make 1 lit solution. What is PH of solution |
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| 16. |
Which is the most electropositive element among li,mg& ca |
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Answer» But we also know that the electropositivity generally decreases from moving left to right It is calcium because as we move down a group generally electropositivity increases and ca is situated lower in periodic table than mg and li Why li can not? How ca |
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| 17. |
What is triple point |
| Answer» Triple point is the pressure,volume and temperaure in solid,liquid and gas. its value 1/273.15k | |
| 18. |
Balancing redox reactions |
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| 19. |
Specify the properties needed to describe the state of a thermodynamic system. |
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| 20. |
Why dry air is heavier than wet air ? |
| Answer» Humidity is water vapor, not liquid water, and water vapor molecules are lighter than the molecules of nitrogen and oxygen that make up approximately 99% of the atmosphere. So, dry air is heavier than humid air. | |
| 21. |
Write the principle of hygiene uncertainty and write its equation. |
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| 22. |
When zinc hydroxide react with sodium what product are formed |
| Answer» 2ZnOH+Na-------Na(OH)2+2Zn sodium hydroxide will form | |
| 23. |
Valency of krypton |
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Answer» 0 2 |
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| 24. |
Difference between ionization energy and electron gain enthalpy |
| Answer» Ionisation energy is the amount of energy required to gain the electron in the isolated state of the element.Electron gain enthalpy is energy released during the loss of electron in it\'s isolated State of atom | |
| 25. |
Anyone please explain POLYBASIC ACIDS and POLYACIDIC BASES??? |
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| 26. |
Why does along moving down the group the radius of the atom increases?? |
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Answer» As we goes down the group the number of shell increases and because of increase of number of Shell the atomic radius increases. The number of energy levels increases as you move down a group as the number of electrons increases. Each subsequent energy level is further from the nucleus than the last. Therefore, the atomic radius increases as the group and energy levels increase. Because the number of shells increases. |
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| 27. |
Draw the energy level diagram of p pi bond between two different nitrogen atom involving p orbital. |
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| 28. |
Calculate ph of 1.0X10^-8M solution of hcl |
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Answer» ph =8 for base concentration but there HCl is acid so that the pH value is less than 7 and therefore for this the pH =6.98 pH=8. |
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| 29. |
Define Thermodynamics in detail |
| Answer» Thermodynamics is the branch of physics concerned with heat and temperature and their relation to energy and work. The behavior of these quantities is governed by the four laws of thermodynamics, irrespective of the composition or specific properties of the material or system in question. | |
| 30. |
By which method we can separate the components from mixture of calcium sulphate and camphor? |
| Answer» By method of sublimation | |
| 31. |
Calculate of moles in 0.04 litres of H2 |
| Answer» | |
| 32. |
Which object is fully isolated system |
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Answer» We can\'t say anything fully isolated.....but some isolated systems are thermos flask , hotcase , Thermos flask or any other closed isolated vessel. |
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| 33. |
Give me a beautiful topic for project file(13 pages) |
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Answer» History of carbon compound Environment chemistry What subject? |
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| 34. |
Is there any chapter added in chemistry?? |
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Answer» Solid state +p-block elements from +2 syllabus Yah... Solid state chapter is added... Solid state |
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| 35. |
Why lithium is called as a strongest reducing agent?? |
| Answer» Alkali metal are very good reducing agents because of their tendency to lose electrons . The reducing charater increase from Na to Cs .However ,Li is stronger reducing agent .........Lithium being small in size has high ionization enthalpy . | |
| 36. |
What is oxidation number of K in KO2 |
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Answer» +4 oxidation number. K shows +1 oxidation state -32 Potassium has 4 oxidation number + 4 |
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| 37. |
What is the difference between mesomeric and inductive effect |
| Answer» This kind of electron distribution in unsaturated compounds conjugated with electron-releasing or withdrawing groups or atoms is called mesomeric effect. The inductive effect is a permanent state of polarization. The electron density in a bond between two unlike atoms is not uniform. | |
| 38. |
How many gm molcules of hydrogen are present in 20gm hydrogen???? |
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Answer» Please explain me solution 20 because H=1 |
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| 39. |
What is the new syllabus of chemistry |
| Answer» solid state is also added Pandey ? | |
| 40. |
What is electrolytic cell |
| Answer» Electrolytic cell is the cell which convert the electrical energy to chemical energy. | |
| 41. |
What is a electrolysis |
| Answer» It is a process through which water molecule are separated in O2 and H+ ion. | |
| 42. |
Why electon not fall in nucleus ? |
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Answer» If electron fall into the nucleus then it will destroy. But it is does not happen BcZ there is repulsion Btwn proton and electron which make it to not fall in nucleus |
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| 43. |
Hydrogen bond is weaker or stronger than vanderwaals force |
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Answer» Stronger even it is the strongest It is stronger than van der waals force |
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| 44. |
What is the normal condition of temperature & Pressure? |
| Answer» Pressure =1atm and temperature =293k | |
| 45. |
Which element of s block doesn\'t react with water |
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Answer» Beryllium (Be) is the only alkaline earth metal that does not react with water. This is due to its small size and high ionization energy in relation to the other elements in the group. Magnesium Litum |
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| 46. |
How much corse will come in final exam of 11 |
| Answer» Whole syllabus | |
| 47. |
What is emphirical formula |
| Answer» It is the simplest whole number ratio of each type of atom in a compound. | |
| 48. |
What is halides? |
| Answer» It is a binary phase of which one is a halogen atom n the other is an element e.g.chloride,flouride,bromide etc. | |
| 49. |
How is work a manifestation of energy |
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| 50. |
Which element have largest ionic radius? |
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Answer» Cesium has the largest ionic radius for a cation . Francium is not counted as it is radio active . Fluorine Francium |
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