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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. |
Calculate the difference in the number of atoms contained in lg C-12 and lg C-14. |
| Answer» NA/84 | |
| 2. |
The following reaction:. 2Br+Cl2--->2Cl+Br2 |
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| 3. |
Plz post the structure of nylon6,6 |
| Answer» | |
| 4. |
Explain Marx Planks Quantam Theory |
| Answer» Planck\'s law describes the spectral density of electromagnetic radiation emitted by a black body in thermal equilibrium at a given temperature T. The law is named after Max Planck, who proposed it in 1900. It is a pioneering result of modern physics and quantum theory. | |
| 5. |
Why in molecular movement we consider 1st and 2s |
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| 6. |
Explain S,P,D,F blocks of the modern periodic table |
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Answer» f-block elementsElements in which the differentiating electron enters into (n-2)f orbital of antipenultimate or ultimate shell are called as f-block elements.f-block contains two series 4f series called as lanthanides and 5f series called as actinides.f-block elements r also known as inner transition elements.General electronic configuration of f-block elements is- (n-2)f^1-14(n-d)^0-1ns^2 np^6 ns^1-2*(for g.e.c.of d-block elements) General electronic configuration of d-block elements - (n-1)d^1-10 ns^2 np^6 d-block elementsElements in which the differentiating electron enters into (n-1)d orbital of penultimate shell are called d-block elements.d-block contains 10 groups (3-12 groups).d-block elements are also known as transition elements except 12 group. First just remember the point that the letter denoting blocks i.e.s,p,d,f are always written in small letters.s-block Elements in which the differentiating electon enters into s-orbital of valence shell are called as s-block elements.s-block max. accomodates 2 electrons so,it has 2 groups,first group and second group.General electronic configuration of s-block elements is - ns^1-2.p-block Elements in which the differentiating electon enters into p-orbital of valence shell are called as p-block elements.p-block max. accomodates 6 electons so,it has 6 groups (13-18 groups). General electronic configuration of p-block elements is - ns^2np6. |
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| 7. |
calculate mass of an atom of silver |
| Answer» mass of 1 atom of silver = 108 / 6.023 x 10^23 = 1.7931 x 10^-22 g.Therefore the answer is =107.9 g/mol. | |
| 8. |
All chemistry work does not match this app |
| Answer» | |
| 9. |
Definition of atomic radius, ionic radius |
| Answer» Atomic radius of an element is a measure of the size of its atom.Ionic radius is half the distance between two ions that are barely touching each other | |
| 10. |
What are isoelectronic species |
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Answer» Elements are ions which have the same number of electrons electrons are called isoelectronic species Species which have same no. Of electrones |
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| 11. |
How to balance equation on element? |
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| 12. |
state Empirical Formula ? And don\'t report my Questions ? |
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Answer» Most of your questions are reported ? formulae depicting constituent atom in their simplest atom |
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| 13. |
Why does nitrogen has an electron gain enthalpy of zero |
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| 14. |
Has anyone taken computer in class11?.. |
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Answer» yes i have taken I too Ya i have taken |
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| 15. |
Calculate the weight of 1 mole of a gas of density 0.1784g/l at NTP??Plzz...help...guys.. |
| Answer» Mass of 1 litre gas is 0.1 784 Mass if 22.4 ________=0.1784×22.4=4 approximately Mass of 1 mole gas =4 | |
| 16. |
Calculate the molar mass of co2 |
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Answer» Molar mass of Co2 is 44 Molar mass of CO2 is 44 |
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| 17. |
When will class 10 result will be declared |
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Answer» 4567 agar jida raha to Jab tu mar jaega tab aaegaa In 3018 may be. ???????? Are u sleeping |
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| 18. |
Definition of electron affinity |
| Answer» The electron affinity of an atom or molecule is defined as the amount of energy released or spent when an electron is added to a neutral atom or molecule in the gaseous state to form a negative ion. | |
| 19. |
What experiment led to the discovery of electrons? Draw a neat labelled diagram |
| Answer» | |
| 20. |
Plz tell where i get questions on mole concept....plz tell somebody |
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Answer» Pradeep refresher me bhut sara questions h mole concept pr base Mole concept sorry abhi padha nhi h |
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| 21. |
What volume of 36m and 1m sulphuric acid mixed to get 1L of 6 M sulphuric acid ? |
| Answer» Please give me answer | |
| 22. |
State law of multiple proportion |
| Answer» When two elements combine to form two or more chemical compounds,the ratio between different weights of one of the elements which combine with a fixed weight of the other is always simple. | |
| 23. |
The density of 3M solutions of Nacl is 1.25g ml-1 calculated the molality of the solution |
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| 24. |
Define kraft temperature |
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| 25. |
Be+3 and a proton accelerated by same potential ,their debroglie wavelength have the ratio |
| Answer» Hi gurcharan | |
| 26. |
Find the energy of radiation whose wave length is 6200 Amstrom units |
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| 27. |
What is the electronic configuration of gadolinium |
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| 28. |
Hi frnds explain me the molecular orbital theory |
| Answer» In molecules, electrons are present in the new orbitals called molecular orbitals. Like atomic orbitals molecular orbitals are also characterized by the set of quantum numbers.The atomic orbitals of nearly same energy and same symmetry can overlap to form molecular orbitals.Molecular orbitals are not associated to a particular atom but belong to the nuclei of all the atoms constituting the molecule ,so it is polycentric theory. | |
| 29. |
How to find number of electrons in Mg where m=0. |
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Answer» 6 Number of electron will be 2. I too don\'t know! |
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| 30. |
Distinguish between homogenous and heterogenous mixture |
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Answer» In homogeneous mixture the components geta completely mixed and we can\'t easily separate it\'s components so it\'s composition is uniform throughout .In heterogeneous mixture the composition is not uniform this means that we can easily separate it\'s components and sometimes the different components can be observed. Composition is complete in homogeneous mixture |
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| 31. |
How is 0.5 ml of NaOH different from 0.5M of NaOH |
| Answer» 0.5 M means 0.5 moles of NaOH present in 1000 ml of solution but 0.5 ml of NaOH is only the quantity of NaOH.... Soo...I think this may be the answer | |
| 32. |
Magnetic radiation oscillating means? |
| Answer» | |
| 33. |
What is the origin of chemical energy? |
| Answer» Chemical energy stored in the bonds of chemical compounds. Chemical energy may be released during a chemical reaction, often in the form of heat; such reactions are called exothermic. Reactions that require an input of heat to proceed may store some of that energy as chemical energy in newly formed bonds. The chemical energy in food is converted by the body into mechanical energy and heat. The chemical energy in coal is converted into electrical energy at a power plant. The chemical energy in a battery can also supply electrical power by means of electrolysis. | |
| 34. |
The highest wavelength results when an electron jumps from n=6 to n=??? |
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Answer» Nice question , sry 4 wrong ans Answer is 5 A man have u left may be 2 Good attempt Sorry but u r wrong the answer is 5 as coming from 6 to 5 energy is minimum and hence wavelength becomes maximum Not sure but may be n=1 |
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| 35. |
Behavior of real gases |
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| 36. |
What is elecron gain enthalpy |
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Answer» in my knowledge.. these are the isolated gaseous atom. sodium, potassium, boron, fluorine. ? Ok plz give me the example of isolated gaseous atom?? Electron gain enthalpy is the energy released when an electron is added to an isolated gaseous atom. |
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| 37. |
What is molarity explain simply |
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Answer» Never mind ohhh noooo?... sorry sorry Darshanaa , he had asked about "Molarity" not molality. Molality is a way of indicating the concentration of a solute dissolved in a solution. It is calculated by dividing the moles of solute by the mass of the solvent in kg.molality=mole of solute/kg of solvent. Molarity means no. of moles of solute present in 1 litre of solution. |
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| 38. |
The ratio of specific cof a proton and an alpha particle is 1)2:1 2)1:2 3)1:4 4)1:1 |
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Answer» Your MENTALITY U think I was judging u but let me tell u No one can judge anyone I was just asking u rest is it mentality. It is from my mind !! ,, don\'t judge anyone without knowing about him okk?? Yes correct but Google or mind Hey mate here is your answer !!!!☺☺The option 1. 2:1 s correct ...?? |
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| 39. |
why water is liquid where as h2se is gas |
| Answer» this is because,, The presence of hydrogen bonding in water, results in more molecules per unit volume. Hence H2O is liquid. No such hydrogen bonding is seen in H2S. | |
| 40. |
How is diboren prepared |
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| 41. |
What is hydrogen economy |
| Answer» Hydrogen economy is the use of liquid hydrogen as an alternate source of energy. | |
| 42. |
Which element can have highest oxidation state ?..... |
| Answer» Iridium has highest oxidation state. | |
| 43. |
What is hund\'s rule |
| Answer» Every orbital in a subshell must be occupied one electron with same spin and after filling of electrons in each orbital ,one more electron can be filled with opposite spin to each orbital... | |
| 44. |
What is the individual oxidation state of the second carbon in C2H5OH |
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Answer» Here 6 hydrogen atoms are present, so +1*6 = +6. O = -2\xa0Thus, +6-2 = +4\xa0Here 2 carbon atoms are present in the equation. To reach oxidation state 2C = -4\xa0C = -2.\xa0Hence,,, the oxidation number of C is -2 The oxidation number of the two carbons together should be -4 . and each carbon is 2. Please anyone post the solution of this question fast as today is my exam |
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| 45. |
What is the valency of hydride 1 or -1 |
| Answer» It has valency 1 | |
| 46. |
what is planks constant? |
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Answer» Planck\'s constant is h Plank constant= M^1L^2T^-1 j/s The Plancks constant (h) can be defined as a proportionality constant that relates the energy (E) of a photon to the frequency (ν) of its associated electromagnetic wave. 6.6×10^-34 Do you want defination |
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| 47. |
Explain uncertainity in measurement. |
| Answer» In metrology, measurement uncertainty is a non-negative parameter characterizing the dispersion of the value attributed to a measured quantity. All measurements are subjects to uncertainty and a measurement result is complete only when it is accompanied by a statement of the associated uncertainty. | |
| 48. |
Difference between electron gain enthalpy and electronegativity |
| Answer» Electron gain enthalpy--> It is the measure of the tendency of an isolated gaseous atom to accept an electron, whereasElectronegativity------>is the measure of the tendency of an atom in a chemical compound to attract a shared pair of electrons towards itself. | |
| 49. |
Calculate the molarity of 29m of CH3COOH is disolved in 4L |
| Answer» | |
| 50. |
Give the main properties of canal ray experiment. |
| Answer» Unlike cathode rays, canal rays depend upon the nature of gas present in the tube. It is because the canal rays are composed of positive ionized ions formed by the ioization of gas present in the tube... | |