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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. |
Find the mass of H 2 required and NH 3 produce from 14g N 2 gas |
| Answer» 3g of H2 and 17g of NH 3 | |
| 2. |
Why ice floats over water? |
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Answer» https://www.zigya.com/share/Q0hFTjExMDg3MzQz Ice floats on water because it\'s density is lesser than water Ice floats on water because of the anomalous expansion of water after 4°C........HOPE IT HELPS...... In the solid state (ice), intermolecular interactions lead to a highly ordered but loose structure in which each oxygen atom is surrounded by\xa04\xa0hydrogen atoms; two of these hydrogen atoms are covalently bonded to the oxygen atom, and the two others (at longer distances) are hydrogen bonded to the oxygen atom’s unshared electron pairs.this open structure of ice causes its density to be less than that of the liquid state, in which the ordered structure is partially broken down and the water molecules are (on average) closer together. When water freezes, a variety of structures are possible depending on the conditions.\xa09\xa0different forms of ice are known and can be interchanged by varying external pressure and temperature. |
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| 3. |
Why is overlapping there between s and pz orbital even when their structures are not symmetrical?? |
| Answer» | |
| 4. |
Konsi books se pdhna chaiye Chemistry ki |
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Answer» NCERT Dinesh publications ABC Of Chemistry by Modern publication Ncert is best... Then you go for other books |
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| 5. |
Calculate the mole fraction of C2H5OH when 10gm of C2H5OH is dissolved in 190gm of water. |
| Answer» | |
| 6. |
Draw p vs r graph for 3d orbital |
| Answer» https://files.mtstatic.com/site_4334/92234/0?Expires=1597484621&Signature=PhFWpEScHMlkO~eCHs~S1aatT~gDOkq3pbB-2pshhd47TyS6VYsT92qgv1Nc7ikc5TG94XXRmfZGSr9rIb94n7Y5lrClSwS2IOKZZI1QPF9WiEe9HmFvTlz1CoVw4yJ0xr2miJ75NFHtt5hSeGDgNnRtyRDRwAWbJoo8eO-wPog_&Key-Pair-Id=APKAJ5Y6AV4GI7A555NA | |
| 7. |
What is chemistry???????? |
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Answer» Or mystery of chemicals is called chemistry Or it is a part of sci in which study about atoms and molecules... Chemistry is a part of science in which we study about molecules and their transformation It is a branch of science which deals with the properties of matter |
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| 8. |
Draw shapes of 2s,2p,3p,3dz2 orbitals and mention angular and radial nodes in these orbitals. |
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| 9. |
Areh bayya anyone please give me an accurate answer which we can byheart for structure of water |
| Answer» I need explanatory note bayya... | |
| 10. |
Explain the structure of water |
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Answer» I am new to cbse so I don\'t know the form of answer writing..... Do this much lengthy answer is needed??? ???? Structure of Water MoleculeIn water molecule, the oxygen is sp3\xa0hybridized and hence has 4 sp3\xa0hybridized orbitals. Two of these sp3\xa0orbitals are half filled and hence overlap with 1s orbital of hydrogen to form two sp3\xa0-s , O-H , σ bond while the other two contain a lone pair of electrons each.The geometry of water molecule should be tetrahedral and the bond angle ∠HOH should be 109.5° but experimentally it has been determined that the actual bond angle is 104.5°.Reason:In water, the oxygen atom is surrounded by two shared pair ,and two lone pair of electrons. According to valence shell electron pair repulsion theory, lone pair- lone pair repulsion are stronger than Bond pair – Bond pair repulsion. As a result the bond angle in water is slightly smaller than the regular tetrahedral angle of 109.5°.The actual bond angle is 104.5° and each O-H bond has a bond length of 95.7pm. |
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| 11. |
What volume of 10M HCL and 3M HCL should be mixed to obtain 1L of 6M HCL solution?....... !!? |
| Answer» Suppose volume of 10 M HCl required to prepare 1 L of 6 M HCl = x litre\xa0Volume of 3 M HCl required = (1-x) litre\xa0Applying molarity equation:\xa0Therefore Vol. of 10 M HCl required = 0.428 L = 428 mL.\xa0Vol. of 3 M HCl required = 1-0.428 = 0.527 L = 572 mL | |
| 12. |
How many moles of caco3 are present in 10gm of substance(ca=40,c=12,o=16) |
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Answer» 0.1 mole W= 10gmMolar mass= 100uNo. of moles = 10/100 =0.1 mol 0.1mol |
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| 13. |
Explain why all d block elements are more transparent elements |
| Answer» | |
| 14. |
How ionisation enthalpy varies in the period |
| Answer» Ionization enthalpy decreases down the group on moving from top to bottom in a periodic table. | |
| 15. |
Any simple method to draw structure of ice |
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Answer» Ohh Cube formation.. Ok... I don\'t know hindi?? Cube ki formation ki tarah hi banega Very easy h |
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| 16. |
Aspirin is a compound with the molecular formula C9H8O4. What id it\'s percent composition? |
| Answer» Percent composition of C(carbon)=total mass of carbon in -C9H804 *100/ molar mass of C9H8O4 =12*9*100/12*9+1*8+16*4= 60%Percent composition of H (hydrogen)=total mass of hydrogen in C9H8O4*100/molar mass of C9H8O4=8*100/180=4.5%Percent composition of O(oxygen)=mass of O in C9H8O4*100/ molar mass of C9H8O4 =16*4*100/180 =35.5% | |
| 17. |
what is Boyle\'s law please ans me?? |
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Answer» P1v1=p2v2 Boyle’s LawAccording to Boyle’s Law, the pressure (P) of a given mass of gas is inversely proportional to its volume (V), provided that the temperature of the gas remains constant.For an enclosed gas, at constant temperature (T);P ∝ 1/Vor, P\xa0× V = constant ie; P1V1 =P2V2 |
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| 18. |
Lewis reprentation of HNO3 |
| Answer» | |
| 19. |
Draw the structure of DNA and RNA |
| Answer» You will search in google hear it\'s not possible | |
| 20. |
Explain mole concept. |
| Answer» 1 mole of a substance is equal to its atomic mass or molecular mass expressed in grams.The atomic mass expressed in grams is the gram atomic mass.The molecular mass expressed in grams is the gram molecular mass.For exampleThe atomic mass of sodium is 23 grams.Therefore, 23 grams of sodium is equal to one mole of sodium atoms.Similarly, the molecular mass of oxygen (O2) = 2 × Atomic mass of oxygen = 2 × 16\xa0= 32 gSo, 32 grams of oxygen is equal to one mole of oxygen molecules.1 mole (of anything) = 6.022 × 1023\xa0in number | |
| 21. |
What are the applications of chemistry? |
| Answer» Chemistry has a direct impact on our life and has wide range of applications in different fields. These are given below:(A) In Agriculture and Food:(i) It has provided chemical fertilizers such as urea, calcium phosphate, sodium nitrate, ammonium phosphate etc.(ii) It has helped to protect the crops from insects and harmful bacteria, by the use ‘ of certain effective insecticides, fungicides and pesticides.(iii) The use of preservatives has helped to preserve food products like jam, butter, squashes etc. for longer periods.(B) In Health and Sanitation:(i) It has provided mankind with a large number of life-saving drugs. Today, dysentery and pneumonia are curable due to discovery of sulpha drugs and penicillin life-saving drugs. Cisplatin and taxol have been found to be very effective for cancer therapy and AZT (Azidothymidine) is used for AIDS victims.(ii) Disinfectants such as phenol are used to kill the micro-organisms present in drains, toilet, floors etc.(iii) A low concentration of chlorine i.e., 0.2 to 0.4 parts per million (ppm) is used ’ for sterilization of water to make it fit for drinking purposes.(C) Saving the Environment:The rapid industrialisation all over the world has resulted in lot of pollution.Poisonous gases and chemicals are being constantly released in the atmosphere. They are polluting environment at an alarming rate. Scientists are working day and night to develop substitutes which may cause lower pollution. For example, CNG (Compressed Natural Gas), a substitute of petrol, is very effective in checking pollution caused by automobiles.(D) Application in Industry:Chemistry has played an important role in developing many industrially ^ manufactured fertilizers, alkalis, acids, salts, dyes, polymers, drugs, soaps,detergents, metal alloys and other inorganic and organic chemicals including new materials contribute in a big way to the national economy.• | |
| 22. |
How many molecules of aspirin are present in 50g tablet |
| Answer» It\'s 0.278u | |
| 23. |
Calculate the number of gram atoms and gram molecules in 25.4 milligram of iodine |
| Answer» | |
| 24. |
Is there any probablity of questions such as definitiins of si base units coming in jee? |
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Answer» I will wait I will say to u My whatsapp no6391348273 Contect with me If you wanna crack JEE then you just need to remember the conversion not the definitions. JEE doesn\'t asks for theoretical question. But don\'t forget to remember the units. Hi |
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| 25. |
Compare the stability of O2 and N2 using MOT. |
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Answer» Mobile no6391348273 Mere whatsapp pr Contect kro mujhe Yahi sb rah gaya tha Kya yaar |
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| 26. |
Give reason. Noble gases have positive value of electron gain enthalpy |
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Answer» Due to the stable configuration, they do not accept an electron and hence they have large positive electron gain enthalpy. An electron has to enter the next higher principal quantum level which leads to a very unstable electronic configuration. I don\'t know |
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| 27. |
Calculate the amount of water g produced by the combustion of 16g of methane |
| Answer» According to the above equation, one mole of CH4 (16 g) on combustion gives one mole of carbon dioxide and 2 moles of water and 2 moles of water = 2 x [2 + 16] = 36 g of water. | |
| 28. |
Calculate the energy of one mole of photon of radiation whose frequency is 5×10power14 Hz. |
| Answer» I Know | |
| 29. |
What is s,p,d,f? |
| Answer» These are the orbitals or subshell | |
| 30. |
How we can calculate diapole movement |
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Answer» Copy paste Yogita No sorry I can\'t do anything Dipole Moment FormulaA dipole moment is the product of the magnitude of the charge and the distance between the centers of the positive and negative charges. It is denoted by the Greek letter ‘µ’.Mathematically,Dipole Moment (µ) = Charge (Q) * distance of separation (r)It is measured in Debye units denoted by ‘D’. 1 D = 3.33564 × 10-30\xa0C.m, where C is Coulomb and m denotes a meter.The bond dipole moment that arises in a chemical bond between two atoms of different electronegativities can be expressed as follows:μ = ?.dWhere: μ is the bond dipole moment,? is the magnitude of the partial charges ?+\xa0and ?–,And d is the distance between ?+\xa0and ?–. |
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| 31. |
Calulate mole frection of ethanol in its 30 % aqueous solution |
| Answer» ANSWER let us assume , we have 100g solution. then, Solution of 30% NaOH means 30gm NaOH is present in 100g solution. Mass of WATER = 70 gm Moles of NaOH = 30/40 = 0.75 molesMoles of Water = 70/18 = 3.89 moles Mole frection of NaOH = xNaOH = 0.75/ 3.89 = 0.22 | |
| 32. |
Law of Conservation of Mass?? |
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Answer» Ab ye app pehle se better ho gya h Pta nhi.... I think koi aaya nhi isiliye wapas chla gya ? Okay..... ? Seraj kha gya?? Knock knock krke ??? Nothing ? |
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| 33. |
Calculate percentage composition in water |
| Answer» Mass percentage of hydrogen=2/18×100 =11.1%Mass percentage of oxyegen in H2O=16/18×100 =88.81 | |
| 34. |
what is Avogadro law plz ans me???? |
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Answer» Avogadro’s law, also known as Avogadro’s principle or Avogadro’s hypothesis, is a gas law which states that the total number of atoms/molecules of a gas (i.e. the amount of gaseous substance) is directly proportional to the volume occupied by the gas at constant temperature and pressure. Avogadro’s law is closely related to the ideal gas equation since it links temperature, pressure, volume, and amount of substance for a given gas. When two different gases are taken with same volume at same pressure and temperature so nub of molecules present in the gases could be same |
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| 35. |
How many no. Have 1 mole |
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Answer» 6.022 × 10²³ 6.023×10^23 = avogadro no 6.022*10^23 6.022 × 10^23mole |
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| 36. |
What is the difference between quantum and photon ? |
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Answer» A photon is a tiny\xa0particle\xa0of light. It is the tiniest particle of light possible in nature. A photon can also be described as a\xa0type\xa0of\xa0quantum, that is, a tiny particle. Some other types of\xa0quanta\xa0(plural) are electrons, neutrinos, and the Higgs boson.A quantum is the tiniest particle possible of a particular substance. For example, in the case of an electron, it’s the tiniest particle possible of negatively-charged matter, just as a photon is the tiniest particle possible of light. Nothing |
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| 37. |
Calculate the amount of water produce by the combustion of 16 g of methane |
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Answer» Thank You Firstly, ch4+2o2=co2+2h2o , now,weight of one mole of water is 18g . 2 miles are form from combustion of 16g methane than 18×2=36 12.044*10 to the power 23 |
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| 38. |
How,can we do chemistery easily |
| Answer» By studying lesson or summary in end of lesson or by take it easy or study it as a story | |
| 39. |
The amount of co2 gas produced by the combustion of 32 g of methane |
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Answer» 88 gms of CO2 89.6g co2 |
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| 40. |
The body temperature of healthy person 300 degree Celsius. Calculate into Farenheit |
| Answer» F° = 1.8(°C) + 32F° = 1.8(300) + 32F° = 540+ 32F° = 572 | |
| 41. |
Tomorrow is my chemistry exam... Feeling nervous?..love u..? |
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Answer» Mera bhi hai bhai , best of luck Best of luck ?all the best All the best for tomorrow ?? Best of luck ?? |
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| 42. |
If the kinetic of an electron increased by 44% find the %change on its de broglie wavelength |
| Answer» | |
| 43. |
What is ion electron method.....??? |
| Answer» \tWrite the skeletal equation and indicate the oxidation number of all the elements which occur in skeletal equation\tFind out the species that are oxidized and reduced.\tSplit the skeletal equation into two half reactions: oxidation half reaction and reduction half reaction\tBalance the two-half equation separately by rules described below:\tIn each half reaction first balance the atoms of element that has undergone a change in oxidation number.\tAdd electrons to whatever side is necessary to make up the difference in oxidation number in each half reaction.\tBalance the charge by adding H+\xa0ions, if the reaction occurs in acidic medium .For basic medium, add OH-\xa0ions if the reaction occurs in basic medium.\tBalance oxygen atoms by adding required number of water molecules to the side deficient in oxygen atoms\tIn the acidic medium, H atoms are balanced by adding H\xa0+\xa0ions to the side deficient in H atoms.\tHowever, in the basic medium H atoms are balanced by adding water molecules equal to number to H atoms deficient.\tAdd equal number of OH-\xa0ions to opposite side of equation.\tThe two half reactions are then multiplied by suitable integers .so that the total number of electrons gained in half reaction becomes equal to total number of electrons lost in another half reaction.\tThen the two half reactions are added up.\tTo verify the balancing, check whether the total charge on either is equal or not. | |
| 44. |
what is 1molal solution ✍️ pls? ans me ???? |
| Answer» Molality is defined as the “total moles of a solute contained in a kilogram of a solvent.”A molal solution is one that contains 1 mol of a solute in\xa01000g\xa0or\xa0kg of the solvent.Molality\xa0(m)=Moles of solute / Mass of solvent in kg | |
| 45. |
What do you mean by quantisation of energy? |
| Answer» An electron can emit or absorb energy as radiations only in fixed amounts or bundles called quanta. This is known as quantisation of energy. | |
| 46. |
What is organic chemistry ...?? |
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Answer» Mst...padhai kaise chal rahi hai?....syllabus kaha tak pahucha??? Gm Bhai...kaise ho? Organic chemistry as the study of carbon/hydrogen containing compounds & their derivatives (containing other elements such as O , X and N). |
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| 47. |
Please Anyone subscribe YouTube channel "Durgesh Tutorial BSS" |
| Answer» | |
| 48. |
Oxidization reaction solving problems and finding oxidizing number in a species |
| Answer» | |
| 49. |
What are the deleted portions of the chapter STRUCTURE OF ATOM |
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Answer» It starts from development leading to Bohr\'s model rest first part is deleted The deleted portions of chapter atomic structure are discovery of electrons,protons and neutrons ,atomic number,isotopes and isobars ,Thomson models and it\'s limitations as well as Rutherford model and it\'s limitations. Hiii bro |
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| 50. |
What is the planning of sports? What is the main objective of sports? |
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Answer» There are various objectives of planning which are stated below: (1)\xa0To enhance the sports performance:\xa0It is also one of the important objectives to improve the sports presentation of athletes or players. Without\xa0appropriate scheduling\xa0it is terrible to progress the performance of sports persons. In fact, training of sports is impractical if it is not well planned. (2)\xa0To keep good control over all the activities:\xa0to keep a decent control over all the actions is\xa0additional purposes of planning.\xa0Planning and regulator are associated with each other. Planning helps in keeping a good controlling organizing a tournament.(3)\xa0To facilitate proper coordination:\xa0this objective of planning is related to facilitate proper coordination among the various member of committees, formed for\xa0organizing the competition smoothly.\xa0A proper planning helps in making the proper coordination. (4)\xa0To reduce the chances of mistakes:\xa0To reduce the chances of mistakes is also a significant\xa0objective of planning.\xa0A proper plan reduces the chances of mistakes and oversights. If there are a number of mistakes in organizing an event, it will not leave a good impression on the participants. (5)\xa0To increase the efficiency:\xa0to increase the efficiency of sports officials in conducting sports\xa0events/competitions\xa0is one of the main objective of planning. It is the important purpose of planning to increase the capability and efficiency of officials. Plz |
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