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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. |
How to find the empirical formula for Fructose |
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Answer» ong>Answer: Explanation: The EMPIRICAL formula is the simplest whole number ratio defining constituent atoms in a species. In all of these problems it is useful to ASSUME 100
g of compund, and calculate the ATOMIC composition. So, in 100 ⋅ g fructose, there are: 40.00 ⋅ g 12.01 ⋅ g ⋅ m o l − 1
=
3.33 ⋅ m o l ⋅ C , 6.72 ⋅ g 1.00794 ⋅ g ⋅ m o l − 1
=
6.66 ⋅ m o l ⋅ H , 53.29 ⋅ g 15.999 ⋅ g ⋅ m o l − 1
=
3.33 ⋅ m o l ⋅ O , If we divide thru by the smallest molar quantity, we GET a formula of C H 2 O . The molecuar mass of fructose is 180.16 ⋅ g ⋅ m o l − 1 . How do we use these data to provide a molecular formula? |
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| 2. |
The process used to obtain salt from se water is _____ |
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Answer» ong>Answer: evaporation Explanation: The sea water is left open for a few HOURS ND after the required time all the water evaporates nd the salt is left behind.......this is how sakt is EXTRACTED from sea water thru the process of evaporation. please MARK as BRAINLIEST |
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| 4. |
The alkali metal with the same number of electrons in 3rd orbit and 4th orbit is A) Na B)K C)Rb D)Cs |
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Answer» ONG>ANSWER: I THINK it's option d caesium(CS) Explanation: As atomic NO. of cs is 55 it electronic configuration is 2,8,18,18,1 |
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| 6. |
Chemistry is a branch of science that deals with. A. Production of better seed B.mineral prospecting |
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Answer» ONG>Answer: MINERAL PROSPECTING is right answers |
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| 7. |
A cube of ice, 2 cm in length, is left out in a cup and it turns to water. The cup is then kept in the freezer. The ice formed has the diameter of the cup. What kind of change occurs in the ice and why? * |
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Answer» ong>Answer: MELTING ice is a not a chemical CHANGE, it's a PHYSICAL change. Ice is SOLID water, and after it MELTS, it's liquid water. Explanation: please mark me as brainliest |
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| 8. |
Observation for conc hcl is added to pb3o4 |
Answer» ONG>Answer:PB3O4 + 8HCL → 3PbCl2 + CL2 + 4H2O |
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| 9. |
Discuss the shape of the following molecules using the VSEPR model:() HStyडिसकस द शेप ऑफ द फॉलोइंग यूजिंग द बीएसईबी और मॉडल फर्स्ट ऐसे 4 सेकंड एक्टू |
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Answer» ONG>EXPLANATION:
thanks for free
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| 10. |
Calculate the relative molecular mass of potassium permanganate |
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Answer» ong>Answer: KMnO4 where, K=39 Mn=55 O=16 =39+55+4*16 =39+55+64 =150(molicular MASS) Explanation: Mark me in brainlist and thank me please |
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| 11. |
Calculate the mass of a nonvoltile solute (molar mass 40gm/mol) which should be disolve in 114gm octane reduce its vapour pressure to 80% |
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Answer» wer : Let the vapour PRESSURE of PURE octane be p10. Then, the vapour pressure of the octane after dissolving the non-volatile solute is 80/100 p10 = 0.8 p10.
Molar mass of octane, (C8H18), M1 = 8 × 12 + 18 × 1 = 114 g mol - 1 Applying the relation, => (p10 - p1) / p10 = (W2 x M1 ) / (M2 x w1 ) => (p10 - 0.8 p10) / p10 = (w2 x 114 ) / (40 x 114 ) => 0.2 p10 / p10 = w2 / 40 => 0.2 = w2 / 40 => w2 = 8 g Hence, the required mass of the solute is 8 g. Mark as brainliest ^_^ |
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| 12. |
Why is heat energy needed to melt a solid? What is this heat energy called? |
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Answer» ong>EXPLANATION: Heat energy is NEEDED to melt a solid because heat energy increases the kinetic energy of particles, which is sufficient enough to break the attraction or bond between the particles and they start MOVING faster. ... This heat energy is called latent heat of fusion. |
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| 13. |
State dipole moment. give its to mule and unit. |
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Answer» ong>Answer: Polarizability of the molecule is DEFINED as the electric dipole moment INDUCED in the molecule per unit INCIDENT electric field. Polarizability α= E P
Units α= N/C C m =C2 MN −1 |
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| 14. |
An element has oxidation states (numbers) -2, +4 and +6 in its compunds. IN whichgroup in the periodic table is this element likely to be: А.IIB.IIIC.IVD.VE.VI |
| Answer» ONG>ANSWER: | |
| 16. |
What is the valance shell of the first 20 elements ( not VALANCY) please help |
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Answer» ong>Answer: K;L;M;N Explanation: |
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| 17. |
Match the following elements of column I with their prop Column 1Column II1. Chlorine(a) Solidhalogen2. Fluorine(b) Radioactive3. Bromine(c) Reddish brown liquid4. Iodine(d) Highest electron affinity5. Astatine(e) Most electronegativeComplete the following equations :Na |
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Answer» ong>ANSWER: Match the following elements of column I with their prop Column 1 Column II 1. Chlorine (a) Solid halogen 2. Fluorine (B) Radioactive 3. Bromine (c) REDDISH brown liquid 4. IODINE (d) Highest electron affinity 5. Astatine (e) Most electronegative Complete the following equations : Na |
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| 19. |
The number of Faradays(F) required to produce 20 g of calcium from molten CaCl,(Atomic mass of Ca = 40 g mol-) is |
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Answer» ong>Answer: The number of FARADAYS(F) REQUIRED to produce 20 G of calcium from molten CaCl, (Atomic mass of Ca = 40 g MOL-) is. mohanaraopalivela13 is waiting for your help. marke as brainlist PLZZZZZZZZ |
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| 20. |
Summary of chapter 'The Periodic Table' in 200 words... |
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Answer» ong>EXPLANATION: Elements are arranged in periods and groups on the periodic table. The elements are arranged according to increasing ATOMIC number. Group 1 is known as the alkali metals, group 2 is known as the alkali earth metals, group 17 is known as the halogens and the group 18 is known as the noble GASES. ... |
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| 21. |
Symbol represents_____ atom of an element |
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Answer» ONG>ANSWER: A CHEMICAL symbol represents a single atom of an ELEMENT: H a single hydrogen atom. |
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| 22. |
Which of the following reactions will not take place ? (a) Zn + CuSO4 → ZnSO3 + Cu (b) 2KBr + Cl2 → KCl + Br2 (c) Zn + MgSO4 → ZnSO4 + Mg (d) Mg + FeSO4 → MgSO4 + Fe |
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Answer» ONG>Answer: The first reaction will not be take PLACE |
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| 23. |
Which of the following is /are the characteristics of coordinate compound 1)They are usually insoluble in water but soluble ine organic solvent2) the melting and boiling point of this compound are are higher then covalent compound3) the bond is rigid and directional4) all of the above are the characteristics of co-ordinate compound |
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Answer» of the above are the CHARACTERISTIC of co-ordinate COMPOUND |
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| 24. |
In a period, the element with maximum atomic volume belongs to group? |
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Answer» ong>Answer: The attraction between the nucleus and the valence electrons INCREASES. This DECREASES the atomic radius. Thus, in a given period, the ALKALI METALS have largest atomic volume, on moving from left to right in a period, the atomic volume decreases and halogens have smallest atomic volume in a given period. hope it helps you |
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| 25. |
The basicity of acetic acid is ______ (four/one). answer fast and correctly...... |
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| 26. |
Which one of the following contain same number of carbon atom as are in 6.0 g of carbon |
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Answer» reason behind this is 6g of C12 contains 0.5 mol and 8g CH4 ALSO contains 0.5 mol. Since 1 mol of anything contains 6.022×10^23 atoms therefore 0.5 mol of anything will CONTAIN equal no. of atoms i.e. 3.011×10^23 atoms.
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| 27. |
Explain the role of the layer of sand place in the conical flask during laboratory preparation of ethyne. |
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Answer» ONG>ANSWER: gyfvhfgigfjfxtegudbxksbvsjdbdjd |
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| 28. |
Number of electrons transferred from one AlAl atom during bond formation in aluminium fluoride............ |
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Answer» Explanation: As Al can DONATE 3 electron and form compound ALF3 |
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| 29. |
State the functions of Chief ministers |
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Answer» g ALIGN="ABSMIDDLE" alt="ANSWER" CLASS="latex-formula" id="TexFormula1" src="HTTPS://tex.z-dn.net/?f=Answer" title="Answer"> ᴛʜᴇ ᴄʜɪᴇғ ᴍɪɴɪsᴛᴇʀs ᴀʀᴇ ᴛʜᴇ ᴄʜɪᴇғᴀᴅᴠɪsᴇʀ ᴛᴏ ᴛʜᴇ ɢᴏᴠᴇʀɴᴏʀs ᴀɴᴅ ᴛʜᴇʏ ᴇxᴇʀᴄɪsᴇs ᴛʜᴇ ᴇxᴇᴄᴜᴛɪᴠᴇ ᴘᴏᴡᴇʀs ᴠᴇsᴛᴇᴅ ᴡɪᴛʜɪɴ ᴛʜᴇᴍ. ғᴏʟʟᴏᴡɪɴɢ ᴇʟᴇᴄᴛɪᴏɴs ᴛᴏ ᴛʜᴇsᴛᴀᴛᴇ ʟᴇɢɪsʟᴀᴛɪᴠᴇ ᴀssᴇᴍʙʟʏ (ᴠɪᴅʜᴀɴ sᴀʙʜᴀ) ɪɴ ᴀ sᴛᴀᴛᴇ, ᴛʜᴇ sᴛᴀᴛᴇ's ɢᴏᴠᴇʀɴᴏʀ ᴜsᴜᴀʟʟʏ ɪɴᴠɪᴛᴇs ᴛʜᴇ ᴘᴀʀᴛʏ (ᴏʀ ᴄᴏᴀʟɪᴛɪᴏɴ) ᴡɪᴛʜ ᴀ ᴍᴀᴊᴏʀɪᴛʏ ᴏғ sᴇᴀᴛs ᴛᴏ ғᴏʀᴍ ᴛʜᴇ ɢᴏᴠᴇʀɴᴍᴇɴᴛ. |
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| 30. |
A symbol represent a short form of : (a) an atom of an element. (b ) a molecule of an element. (c) a compound (d) both(a) and (b) |
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Answer» ONG>Answer: ANSWER A symbol REPRESENTS: A. NAME of an element B. ONE atom of element C. Quantity of element equal in mass to its atomic mass. Answer By avatar Toppr |
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| 31. |
How will you convert 1) butan to 1 - chlorobutane |
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Answer» g align="absmiddle" ALT="Answer" class="latex-formula" ID="TexFormula1" SRC="https://tex.z-dn.net/?f=Answer" title="Answer"> sʏɴᴛʜᴇsɪs ᴏғ ʙᴜᴛᴀɴᴇ-1-ᴏʟ ғʀᴏᴍ 1 ᴄʜʟᴏʀᴏʙᴜᴛᴀɴᴇ: ᴛʜᴇ ᴄᴏɴᴠᴇʀsɪᴏɴ ʀᴇᴀᴄᴛɪᴏɴ ᴏғ 1ᴄʜʟᴏʀᴏʙᴜᴛᴀɴᴏʟ ᴛᴏ 1 ʙᴜᴛᴀɴᴏʟ ᴛᴀᴋᴇs ᴘʟᴀᴄᴇ ᴜɴᴅᴇʀ ᴀ sᴛʀᴏɴɢ ʙᴀsᴇ ʟɪᴋᴇ ᴋᴏʜ. ᴛʜᴇ 1ᴄʜʟᴏʀᴏʙᴜᴛᴀɴᴏʟ ʀᴇᴀᴄᴛs ᴡɪᴛʜ ᴋᴏʜ ᴛᴏ ɢɪᴠᴇ ʙᴜᴛᴀɴᴇ-1-ᴏʟ ᴀs ᴛʜᴇ ᴅᴇsɪʀᴇᴅ ᴘʀᴏᴅᴜᴄᴛ ᴀʟᴏɴɢ ᴡɪᴛʜ ʜᴄʟ ᴀs ᴀ ʙʏ-ᴘʀᴏᴅᴜᴄᴛ. |
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| 33. |
It's correct Ans is 3 option . |
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Answer» it is correct. <U>Plss plss plss pls thank maximum 200answers if POSSIBLE or else minimum 100 of my ANSWERS so that i can reach my target 5 thousand thanks whoever is watching this plss do it in return i will follow u |
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| 34. |
1. A gaseous mixture contains 160g of neon and 64 g of oxygen in 82.1 litrevessel at 27°C. The partical pressureof neon may be R1) 2.4 atm 2) 0.6 atm3) 1.5 atm 4) 3 atmnity of |
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Answer» g align="ABSMIDDLE" alt="Answer" class="latex-formula" id="TexFormula1" src="HTTPS://tex.z-dn.net/?f=Answer" title="Answer">
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| 35. |
A solution of substance x is used for white washing name the substance and write its formula |
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Answer» ONG>ANSWER: Its WASHING soda Explanation: it's formula is Na2CO3 |
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| 36. |
How will you convert 1) propane to 1 - chloropropane |
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Answer» ong>Answer: 2-chloropropane also KNOWN as isopropyl choride could be prepared from propane and Cl2 in a reaction involving the formation of free RADICALS as intermediates during the reaction the reaction. This reaction requires either HEATING or UV LIGHT to occur. This reaction will also give 1-chloropropane as a by-product. Explanation: mark me as BRAINLIST plz please and give me thanks please please |
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| 37. |
मान जात कीजियlog |
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Answer» ong>ANSWER: yah kya likha HUA Hindi mein Manza kijiye samajh Nahin a Raha Hai Ek Bar fir se bhejo Nahin to FOLLOW KAR do Tab samajh JAENGE kya hai |
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| 38. |
QUANTITIVE CHARACTER OF An ITEN Is shown by :-V ATTRIBUTES(2) VARTABLES(3) FIGURESU TABLES |
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Answer» ong>Answer: variables Explanation: how much I LOVE you and I miss you |
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| 39. |
How many hydrogen bond does a water molecule can have |
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Answer» ong>2 is ur answer 2 is ur answer Hope it HELPS |
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| 40. |
How to balance following equation 3kclo3 |
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Answer» ONG>Explanation: 2KClO3-->2KCl+3O2 ...... |
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| 42. |
Potassium bromide reacts with Barium chloride. |
| Answer» POTASSIUM bromide+Barium IODIDE = Potassium iodide+Barium bromide. | |
| 43. |
Why glass is a heterogeneous mixture ? |
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Answer» ong>Answer: Please mark as Brainlist Explanation: CHEMICAL solutions are usually homogeneous MIXTURES. The exception would be solutions that contain another phase of matter. For example, you can MAKE a homogeneous solution of sugar and WATER, but if there are crystals in the solution, it becomes a heterogeneous mixture.Jul 22, 2019 |
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| 44. |
A nonmetal X is present in two forms in nature P and Q. P is the hardest element and Q is a good conductor of electricity. X when burnt in air forms an oxide Y.Y dissolved in water forms Z. Identify X,P,Q,Y,Z and write the chemical reactions supporting your answers. What will be the action on litmus by the compound Z? |
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Answer» ong>Answer: Y, that is, the hardest NATURALLY occurring SUBSTANCE in the world is diamond.The substance Z, which is a good conductor of electricity is Graphite.Both diamond and Graphite come from CARBON, a non-metal which LACKS lustre, and also does not conduct electricity.Carbon and diamond and graphite have DIFFERENT properties due to the crystal structures of each.PLZ MARK AS BRAINLIEST ANSWER ,FOLLOW ME AND THX FOR THE SUPERB QUESTION |
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| 45. |
sodium carbonate crystals contain 1.698% of water of crystallisation find the no. of molecules of water of crystallisation per molecule. |
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Answer» ong>Answer: not SURE BT may be this ur answer if YES then mark it as brainliest Explanation: The chemical formula of washing soda is Na 2 CO3 ⋅10H2O. It is sodium carbonate decahydrate. So it contains 10 water molecules. as there is 1.698% of water crystallisation then, no of. molecules = 10 no of molecules of water crystallisation PER molecule == 168/100 * 10 == 16.8 |
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| 46. |
Pls answer these chemistry questions It would be better if there is explanationOtherwise options are enough |
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Answer» ONG>Explanation: 16) B) O^2- 20)A) 21)A) |
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| 47. |
♡ 3.Evaporation of river water is alan..(desirable/undesirable) endothermic chaange |
| Answer» ONG>ANSWER: | |
| 48. |
Ep 20 worksheet Honce Assignment 2write the formula and names of the Compound formed blew.Na2sALCIBwaite the formulae of the molecular compounel-on |
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Answer» ONG>ANSWER: write your question properly |
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| 49. |
Assinale a alternativa correta, para o preparo de uma solução 1mol de BaCl2 pesa-se 208,23g em 1L de solução. Qual seria a quantidade de massa a ser pesada para o preparo de uma solução 1mmol/L de BaCl2? a) 208,23g b) 208,23mg c) 208,23g/mol |
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Answer» ong>Answer: find it on doubt NOUT I'm SURE you will get the correct answer Explanation: give me a thanks ❤️ MARK as brainliest follow me |
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