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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.
| 2. |
Define the following terms a. Antibioticsb. Antiseptics.c. Anionic detergents |
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Answer» Answer: Antibiotics : These are the compounds (produced by microorganisms or synthetically) which either end rebuild the growth of BACTERIA or kill bacteria. Example- Penicillin. Antiseptics : These Hardik chemicals used to kill or PREVENT the growth of microorganisms when APPLIED it to the living tissues. Example- Soframicin. Anionic detergents : These aur sodium salts of sulphonated long chain alcohols or hydrocarbons. In these the anionic part of the molecule is involved in the CLEANING ACTION. Example- Sodium lauryl sulphate. |
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| 3. |
200 ml of a solution contains 0.754 g of a sodium bicarbonate Na HCO3 what is the normality |
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Answer» Explanation: 200 ML of a solution contains 0.754 g of a sodium BICARBONATE Na HCO3 what is the NORMALITY |
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| 4. |
Q.4. What is the law of constantproportion |
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Answer» Answer: In chemistry, the law of definite proportion, SOMETIMES called PROUST's law, or law of constant COMPOSITION states that a given chemical compound always contains its component elements in fixed ratio and does not depend on its SOURCE and METHOD of preparation. |
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| 5. |
Marco and Jaden are investigating diffusion. They have 12 petri dishes filled with jelly that has been made up with slightly acidic water and universal indicator solution. The jelly is red. Marco and Jaden have cut circles from the center of the jelly using a cork borer. They have been given four bottles of sodium Hydroxide of different concentrations. The bottles are labelled A, B, C and D. The student place a measured volume of the sodium Hydroxide from bottle A into the well in the jelly. After 10 minutes they mark and measure how far the Sodium Hydroxide has diffused into the jelly. They repeat the test twice more. They do this for the Sodium Hydroxide from bottle B, C and D. Here are their results. a. What safety precautions should Marco Jaden take?2SEE ANSWERSLog in to add commentAnswer2.0/51WHAT IS THE PRECAUTIONS. |
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Answer» Marco and Jaden are investigating diffusion. They have 12 PETRI dishes filled with jelly that has been made up with slightly acidic water and universal indicator SOLUTION. The jelly is RED. |
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| 6. |
Convert 700Hg to atm and kpa |
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Answer» fizraiarlstl4wdvgkodiudizzotarists8stts7udtistsiztiufzxtutxufuud
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| 7. |
Write the relation equationbetween of wavelength & energy with the help of |
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Answer» Answer: Just as wavelength and frequency are related to light,they are also related to energy.The shortest the wavelength and higher the frequency corresponds with GREAT energy.So the longer WAVELENGTHS and the lower the frequency RESULTS in lower energy.The energy EQUATION is E=hv. |
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| 8. |
What is the nature of Cu SO4? |
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Answer» plz mark me brainliest Anhydrous copper(II) sulfate is a white solid. It can be produced by dehydration of the normally AVAILABLE pentahydrate copper sulfate. In nature, it's FOUND as the very rare mineral KNOWN as chalcocyanite. |
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| 9. |
Write the name and principle of the method used for refining ofa. zinc b. Germaniumc. Titanium |
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Answer» Zinc : Distillation is used for refining zinc. Zinc is a low boiling metal the impure metal is evaporated and the pure metal is obtained as a distillate. Germanium : Refining is used for refining Germanium. In this method is based on PRINCIPLE that the impurity are more soluble in the melt then in the SOLID state of the metal. Titanium : Titanium is refined by van Arkel method. This method is used for REMOVAL of oxygen and NITROGEN present as impurity. The crude metal is heated in an evacuated vessel with iodine to obtain metal iodide, which volatizers being covalent. Later this metal iodide is decomposed through electrical heating to obtain the pure metal. |
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| 10. |
WHAT IS SOUND??? WITHOUT AIR. CAN IT BE TRAVEL? |
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Answer» Answer: They can also feel the WAVES. Sound cannot TRAVEL through a vacuum. A vacuum is an area WITHOUT any air, LIKE space. So sound cannot travel through space because there is no matter for the vibrations to work in. |
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| 11. |
N=4से कितनी उपकप संकलन होती है |
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Answer» Answer: (ख) ms=-12 युक्त उपकोश (n=4) में 16 इलेक्ट्रॉन उपस्थित होंगे । STEP by step SOLUTION by experts to help you in DOUBT clearance & scoring EXCELLENT marks in exams |
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| 12. |
Show the relationship between standard electrical conductive force and common constant ? |
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Answer» cømê fstér ♥️♥️ txo-vfuy-nzk. S txo-vfuy-nzk. E xo-vfuy-nzk. x txo-vfuy-nzk xo-vfuy-nzk. fasterrrrrrr txo-vfuy-nzk |
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| 13. |
Can someone please write me a chemical activity |
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Answer» A chemical reaction is a process that leads to the chemical TRANSFORMATION of one set of chemical substances to ANOTHER. |
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| 14. |
Elements A,BC have atomic number 9,20,10 respectively state which one is a non metal metal chemically inert |
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Answer» Answer: 9- FLOURINE, 20- calcium, 10- NEON Explanation: Neon is the chenically INERT noble Gas. Calcium non - metal Flourine is Halogen |
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| 15. |
Balance the equation: Fe + OтВВ ---> FeтВВOтВГ How many moles of FeтВВOтВГ are produced when 0.275 moles of Fe is reacted? |
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Answer» this is your ANSWER |
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| 16. |
Which has more number of molecules 9g of water or 9g of sugar |
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Answer» Explanation: 9g of suger hope it HELPS you |
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| 17. |
3. What is low of multiple proportion ? expain with an example |
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Answer» This example illustrates the law of multiple proportions: Whenever the same two elements form more than one COMPOUND, the DIFFERENT masses of one element that COMBINE with the same mass of the other element are in the ratio of small whole numbers. ... CARBON can form two different compounds with oxygen. |
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| 18. |
N=4 se kitni upkosh sankalan hoti hai |
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Answer» what do you MEAN FRIEND I cannot UNDERSTAND HENCE I cannot answer |
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| 19. |
How are the following different from other members of their class (a) lead (b) graphite (c)hydrogen (d) mercury (e) bromine |
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Answer» Answer: GM6eweb forlorn I love it and I don't know how to make it to message 7 Explanation: EX I MISS u so MUCH sir for the FIRST time I get off at my house and we can use to be a |
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| 20. |
2 Anabolisum :-definition |
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Answer» Answer: Anabolism and catabolism are the two BROAD types of biochemical reactions that make up metabolism. Anabolism builds complex molecules from simpler ones, while catabolism breaks large molecules into SMALLER ones. ... Vitamins, MINERALS, and cofactors aid the reactions. |
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| 21. |
Calculate the molecular mass of CO2 and H2O.(Given. Atomic mass of C=12u, O=16u, H=1u) |
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Answer» 12+16×2 12+32 44u H2O 1+2×16 1+32 33u Explanation: |
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| 22. |
Which of the following substitution is likely to be the highest fraction when toluene undergoes nitration? 1.ortho. 2.meta. 3. Pera 4.ortho and pera |
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Answer» Nitration of ANILINE in Conc. H2SO4 and HNO3, we can understand the formation of both para and META NITRO aniline |
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| 23. |
1) Describe how Iron and Lead react with hydrochloric acid. Writebalanced equations for the reactions.2) Write a rule for the reaction of a metal with:a) Oxides of other metalsb) Solutions of compounds of other metals3) Will Copper react with lead (II) oxide? Explain why.4) Tin does not react with Iron (II) oxide. But it reduces Lead (II)oxideto lead. Arrange Tin, Iron and Lead in order of decreasing reactivity.5) Name the product of burning sulphur in air6) The metal Sodium burns in Oxygen with bright yellow flame to formSodium -Oxide.a) Write the balanced chemical equation for the reaction betweenSodium and Oxygenb) What is formula of Sodium Oxide?c) Name this type of oxided) Predict whether Sodium Oxide is solid, liquid or gas at roomtemperature. |
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Answer» Answer: 1. Give an example of a metal which (i) is a liquid at room temperature. (ii) cart be easily cut with knife. (iii) is the best CONDUCTOR of heat. (iv) is a poor conductor of heat. Ans. (i) Mercury (HG) (ii) Sodium and potassium (iii) Silver and COPPER (iv) Lead -. 2. Explain the meanings of malleable and ductile. Ans. Malleable: A metal is said to be malleable if it can be beaten into thin sheets, e.g. silver and gold are the best malleable metals. Ductile: A metal is said to be ductile when it can be drawn into thin wires, e.g. silver and gold are the best ductile metals. 3. Why is sodium KEPT immersed in kerosene oil? Ans. Sodium is highly REACTIVE metal. It reacts with oxygen in air at room temperature, the reaction is highly exothermic. To prevent this sodium is kept preserved under kerosene. Sodium does not react with kerosene. 4. Write equations for the reactions of (i) iron with steam (ii) calcium and potassium with water Ans. (i) Iron with steam
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| 24. |
1.7 means in TiH1.7 interstatial compounds |
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Answer» kvjocohoucuocouocyo sayocjlcjloysi Explanation: |
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| 25. |
1What is Empirical formula |
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Answer» Answer: formula giving the proportions of the elements present in a COMPOUND but not the actual NUMBERS or arrangement of atoms. Explanation: chemistry, the EMPIRICAL formula of a chemical compound is the simplest positive integer RATIO of atoms present in a compound. A simple example of this concept is that the empirical formula of sulfur monoxide, or SO, WOULD simply be SO, as is the empirical formula of disulfur dioxide, S₂O please mark me brainlist |
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| 26. |
23×11 complete the following mass of numbers no of elements no of protons atomic number no of neutrons |
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Answer» Answer: sodium The mass NUMBER is given at the TOP left of the elements symbol, for example, sodium has a mass number of 23. We know that the atomic number of sodium is 11. This tells us that sodium has 11 PROTONS and because it is neutral it has 11 ELECTRONS. |
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| 27. |
Ionic compoundपुरी तरह से ionic होते हे कि नहीं हिन्दी में |
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Answer» अपने शुद्धतम रूप में, आयनिक संबंध दिशात्मक नहीं है। इसे बिंदु आवेशों के बीच सरल धनात्मक-ऋणात्मक कोलोम्बिक आकर्षण माना जा सकता है। यह सहसंयोजक बंधन से अलग है, जिसमें चुनाव होता है |
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| 28. |
Definition of strong electrolysis, |
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Answer» Answer: strong electrolyte is a solution/solute that completely, or almost completely, ionizes or DISSOCIATES in a solution. These ions are good conductors of electric current in the solution. Originally, a "strong electrolyte" was defined as a chemical that, when in aqueous solution, is a good conductor of electricity. Explanation: please MARK me BRAINLIST because I NEED 15 brainlist answers for the NEXT rank. |
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| 29. |
The chemical symbol for nitrogen gasa) Nib)N2c) N+d)N |
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| 30. |
Enter the number of electrons in each energy level (shell) for each of the elements O |
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Answer» Answer: Oxygen - 2, 6 Explanation: Oxygen - Atomic No. 8 6 in L shell |
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| 31. |
What is the difference between the structure for hybridisation and that of VSEPR theory? |
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Answer» Explanation: Our chemistry teacher TOLD us that both VSEPR theory (which SAYS that the electron pairs in the valence shell of an atom arrange themselves in such a way that repulsions among them are minimized and this arrangement of the electron pairs determines the shape of a particular molecule) and HYBRIDIZATION. |
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| 32. |
Chemical equilibrium ka Numrical |
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Answer» The VALUE of K indicates the EQUILIBRIUM ratio of products to reactants. In an equilibrium mixture both reactants and products co-exist. Large K > 1 products are "favored" K = 1 NEITHER reactants nor products are favored. |
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| 33. |
formulate the main products for the oxidation and dehydration reactions of the followin compound: CH3-CH2-CH-CH2-CH3 |
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Answer» JOIN----------------------- yyz-sdtd-gfn |
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| 34. |
the correct symbol of nitrogen gas is a) Ni. b)N2. c)N+. d) N |
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Answer» d)N Explanation: |
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| 35. |
During cathode reaction in dry cell Mm is reduced from ___ to ___ |
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Answer» Answer: how to draw a gate or a CAR to draw your own image into the WHEEL of your car to the end or the other way to MAKE the JOURNEY BETTER |
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| 36. |
Refer the image and show the bond line structure for that particular compound. |
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| 37. |
Rust is hydrated iron II oxide which is acidic in nature true or false |
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Answer» False Explanation: Because it iron OXIDE is an BASIC oxide,all metals form basic oxide |
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| 38. |
An element x exist as x4 in benzene |
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Answer» Answer: An element X of ATOMIC mass 25 g exists as X, in benzene to the extent of 100%. When 10.30 g of saturated solution of X in benzene is added to 20.0 g of benzene, the depression in freezing point of the resulting solution is 0.51 K, If K of benzene is 5.1 K kg mol-1, the solubility of X in 100 g of benzene will be. A) 2.9 g B)3.0 g h C) 0.7 g D) 0.3 g |
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| 39. |
Vinyl carbocation Hybridization |
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Answer» Answer: LU ghar me KOI h to ncert books me know if you have any QUESTIONS or need any further information please send me Explanation: there are no hindi meanings for 6jh h jab chotu KAL aapko paisa de denge ye sab likhna hai ki baat 5 |
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| 40. |
Which of thes has highly electroplating |
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Answer» Answer: HOPE it will help you Explanation: Electroplating is the process of plating one METAL onto ANOTHER by hydrolysis, most commonly for decorative purposes or to prevent corrosion of a metal. There are also specific TYPES of electroplating such as copper plating, silver plating, and chromium plating. ... The surface can be a metal or even plastic. |
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| 42. |
How will you convert phenol in banzene |
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Answer» C6H5OH + ZN dust ---> C6H6 Explanation: |
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| 43. |
Balance the following equation by ion electron method in acidic mediuma) Cr2O7²- +C2H4O→ C2H4O2 +Cr³+ |
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Answer» here your answee Explanation: Cr2O72- + C2H2O- → C2H2O + Cr3+ ...(i) Here Cr2O72- → 2Cr3+ i.e., Cr2O72- → 2Cr3+ + 7H2O 6e- + 14H+ + Cr2O72- → 2Cr3+ + 7H2O [H2O + C2H4O- → C2H4O2 + 2H+ + 3E-] x 2 ...(ii) 10H+ + Cr2O72- + 2C2H4O- → 2C2H4O2 + 2Cr3+ + 5H2ORead more on Sarthaks.com - https://www.sarthaks.com/608497/cr2o7-2-c2h4o-c2h4o2-cr-3-in-acid-solution-by-ion-electron-method |
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| 44. |
Which is the waste disposal method that produces heat? |
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Answer» Incineration Incineration. Combustible waste from HOUSEHOLDS and waste WOOD that is not suitable for RECYCLING UNDERGO thermal treatment in waste incineration plants or waste wood furnaces. The heat released in the process is used to generate electricity and heat buildings. |
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| 45. |
If(n+l)=4 , then maximum possible subshells will be.options:a.1b. 2c. 3d. 4need detailed answer |
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Answer» B. 2 |
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| 46. |
A solution of a substance 'X' is used for whitewashing .(i) Name the substance 'X' and write it's formula .(ii) Write the reaction of the substance 'X' named in (i) above with water . |
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Answer» BOSNIA HERZEGOVINA BOTSWANA BRAZIL and vented In panchayat polls |
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| 47. |
Speed si unit measured in |
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Answer» Answer: The SI unit of speed is the metre per SECOND, but the most COMMON unit of speed in everyday usage is the kilometre per hour or, in the US and the UK, miles per hour. |
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| 48. |
The essential conditions required for rusting are moisture and nitrogen true or false |
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Answer» answer the ESSENTIAL CONDITIONS reqired for RUSTING are MOISTURE and nitrogen correct= false answer=oxygen and moisture |
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| 49. |
Which of the following is not a naturally occurring indicator(a) turmeric(b) litmus(c) phenolphthalein(d) purple cabbage |
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Answer» phenolpthalein Explanation: |
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