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This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 2501. |
Who have more electron affinity between berillium and nitrogen, since they both have Electron affinity 0 (approx)? Explain |
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Answer» Hey there NITROGEN will have GREATER electron affinity as when we go ACROSS a PERIOD Electron affinity INCREASES. |
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| 2503. |
A compound made up of two element A and B has 70% and 30%. Their relative number of moles in the compound are 1.25 and 1.88 .Calculate atomic mass of element A and B |
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Answer» Answer: RELATIVE no. of moles of an element Atomic mass of B = 30/1.88 = 16 Calculation of Empirical formula Element Relative no. of moles Simplest MOLAR ratio Simplest whole no. molar ratio A 1.25 1.25/1.25 = 1 2 B 1.88 1.88/1.25 = 1.5 3 Empirical formula = A2B3 Calculation of molecular formula Empirical formula mass = 2 X 56 + 3 x 16 = 160 n = molecular mass / Empirical formula mass = 160/160 = 1 Molecular formula = A2B3
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| 2504. |
Oi] si (s) + O2(g) SiO2 (s)AH91vi] 2c cgraphite) + O2(g) 200AHii] Sics) C cs )sic-65.3Calculate AH' For SiO2 (s) + 36 (S) Sic (s)221AH =+ 2009 |
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Answer» Answer: tex] \begin{lgathered}\tt \implies \: (25 - x) {}^{2} = (x) {}^{2} + (5) {}^{2} \\ \tt \implies625 - 50 + x {}^{2} = x {}^{2} + 25 \\ \tt \implies - 50 Find a quadratic polynomial with zeroes 2 and 3. ________________________________________ #No Spam! ★ Find a quadratic polynomial with zeroes 2 and 3. ________________________________________ #No Spam!Steps: 1) Draw a line segment AB of length 9.3 UNITS. 2) Extend the line by 1 UNIT more such that BC=1 unit . 3) Find the midpoint of AC. 4) Draw a line BD perpendicular to AB and let it INTERSECT the semicircle at point D. 5) Draw an ARC DE such that BE=BD. Therefore, BE= 9.3
units |
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| 2505. |
The reaction does not take place if a few drops of dilute sulphuric acid are not added to water.Why? |
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Answer» Answer: When acid such as sulphuric acid ( H2SO4 ) is added, the compounds separate into seperate ions and having smaller number of ions increases CONDUCTIVITY. This doesn't require an acid . ... Even normal tap water has ENOUGH ions to be a good conductor, which is neccessary to EFFICIENTLY perform electrolysis. Explanation: pls mark me ''brainliest!!''' |
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| 2507. |
campair solids ,liquid and gases in terms of their Intermolecular force of attraction and intermolecular space |
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Answer» Answer: This is your answer.... The intermolecular force:- Highly Strong intermolecular forces between the molecules, leads to a definite volume in SOLIDS.-----------> Solid The intermolecular forces are stronger than GASES but weaker than solids for liquid.------------------->Liquid The intermolecular forces are PRACTICALLY non-existent. Thus, there is no definite volume.------------------->Gas The intermolecular space:- The intermolecular space between solids is absent.-----------> Solid The intermolecular space is moderate but present.-------------> Liquid The intermolecular space is free-flowing and plenty.------------> Gas PLEASE MARK AS BRAINLIEST IF IT REALLY HELPS YOU...❣❣❣ |
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| 2508. |
Identify 'A' and 'B' in the followingconversions.Na СН, ОН- В(ii) CH-BrAgNOАSn/HCIBNa/C.H.OH(iii) CH-1 AgCNA- В(1) CH-1 KCN. |
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Answer» whhrocwjbdehxqghdohswthg Explanation: dghrgcfhcyjxejgeucfncrjdhxt dybfhhdgc VUJ |
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| 2509. |
Pass the journal entries |
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Answer» Answer: . DRAWINGS a/c dr 30,000 To cash 20,000 To purchases 10,000 ( being cash of rs. 20,000 and goods worth rs. 10,000 WITHDRAWN by proprietor) . Goods distributed for charity a/c dr 50,000 To purchases 50,000 . Goods distribute as FREE sample a/c dr.25,000 To purchases 25000 . Cost embezzlement a/c dr. 70,000 To cash 20,000 To purchases 50,000 . Loss by fire a/c dr. 40,000 insurance claim RECEIVES a/c dr. 60,000 To goods destroy by fire 1,000,00 Explanation: Hope you like it |
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| 2510. |
Calculate the number of moles of Cu(C2H3O2)2 present in 200 gram |
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Answer» MARK as brainlist Explanation: Alias: Cupric Acetate Formula: Cu(C2H3O2)2 Molar MASS: 181.634 |
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| 2511. |
Y reaction is said to be in equilibrium, when:(1) Only 10% conversion x to y takes place.(2) Complete conversion of x to y takes place(3) Conversion of x to y is only 50% complete(4) The rate of change of x to y is just equal to therate of change of y to x in the system |
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Answer» 4TH is the answer Explanation: |
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| 2512. |
Find the name of the structure of the above |
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Answer» Structure: Protein structure Name: 4- methylbenzaldehyde PLZ MARK ME AS BRAINLIEST!!!!!!!!!!!! |
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| 2513. |
1.Select the endothermic reaction :-(1) 2H, + 0,2H,0(2) N, + 0, + 2NO(3) 2NaOH + H,SO, → Na, SO4 + 2H,0(4) 30, + C,H,OH → 2C0, + 3H2O |
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| 2514. |
What is chemical reaction?Give examples of chemical reaction. What are the types of Chemical reaction? What does the formula of substance tell us? |
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Answer» Chemical reaction is a PROCESS of forming new product by the reaction of two or more than two reactants. Chemical reactions occurs when two reactants of similar or different properties react together. A new substance is formed when the different chemicals are reacted together. Examples of chemical reaction:
In a chemical reaction, The two reactants react with each other to form new product. The new product formed may have same physical properties, but the chemical properties always changes. While chemical reaction, no atoms are destroyed nor new atoms are formed. Only, The atoms are rearranged to form new substance. Chemical reactions are of 4 types: Composition, Decomposition, Single replacement , Double replacement. Composition
Decomposition reaction
Single Displacement reaction
Double displacement reaction
Examples of Chemical reaction:
What does a formula tell about substance:
Example:
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| 2515. |
A grey colour metal X, used for coating iron to prevent it from rusting. It exits in form of Y in nature, which on heating changes to oxide Z. Z on reduction with carbon gives X and CO. Identify X and write chemical for the reaction involved. |
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Answer» XIS zinc Zn+ O= ZnO |
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| 2516. |
2.Which of the following is a characteristic of a re-versible reaction :(1) Number of moles of reactants and products areequal.(2) It can be influenced by a catalyst(3) It can never proceed to completion(4) None of the above |
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Answer» Answer: REVERSIBLE reactions are those reactions in which there is equilibrium established at EVERY INFINITESIMAL step. But the rate of forward and backward reactions can be SPEED up by the influence of a CATALYST. |
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| 2517. |
one half cell in a voltaic cell is constructed from a silver wire dipped in silver nitrate solutions of unknown conc. it's other half cell consists of a wire electrode dipping in 0.1m solution of zn(no3)2.Avoltage of 1.48v is measured for this cell |
Answer» Ag+ = 1.247 * 10^-2 MExplanation: We know that E^o (Zn2+ /Zn) = -0.763 V and E^o (Ag2+ /Ag) = +0.80 V In Electrochemical cell, Zn(s) [Zn2+(0.10M] [Ag+ Conc.] Ag(s) E^o (cell) = 0.80 (-0.763) V E^o (cell) = 1.563 V Also E^o (cell) = [E^o(R) - E^o(L)] - 0.0591/n. Log [Zn2+]/ [Ag+]^2 1.48 = 1.563 - 0.0591/2 Log [0.10]/ [Ag+]^2 Log[0.10]/ [Ag+]^2 = 0.083/0.02955 Log[0.10]/ [Ag+]^2 = 2.8087 Therefore [0.10]/ [Ag+]^2 = Antilog of 2.8087 [0.10]/ [Ag+]^2 = 643.7 [Ag+]^2 = 0.10 / 643.7 [Ag+]^2 = 1.553 * 10^-4 Hence Ag+ = ROOT of 1.553 * 10^-4 Ag+ = 1.247 * 10^-2 M |
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| 2518. |
If copper rod is dipped in ironsulphate solution will reaction take place? why? |
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Answer» Explanation: yes when CU is DIPPED in FeS solution Cu will REPLACE FE and form CuS because Cu is more reactive than iron |
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| 2519. |
In which of the following region, NMR spectra isobtained?(a) Microwave (b) Radio wave(c) Infrared(d) UV-visible |
Answer» (B) RADIO waveᏴᎬ ᏴᎡᎪᏆNᏞY |
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| 2520. |
1 part of an element A combines with 2parts of another element b, 6parts of element Combine together the ratio of their weights will be governed by |
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Answer» ANSWER: According to the law of reciprocal proportions the weights of two ELEMENTS COMBINING with a fixed amount of the third element will bear the same ratio (or simple MULTIPLE of it) in which they themselves REACT.
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| 2521. |
Sea water is a mixture. True or False |
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Answer» ANSWER:True Explanation:PLEASE MARK it as the BRAINLIEST!!! |
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| 2522. |
एंथैल्पी परिवर्तन एक अवस्था फलन है।Enthalpy change is a state function. |
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Answer» Explanation: Enthalpy CHANGE is the DIFFERENCE in heat energy of reactants n products which will DEPEND UPON the state of reactants n products so it is a state fun |
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| 2523. |
Discuss VBT details for CCl4 |
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Answer» Answer: A carbon ATOM W electron ARRANGEMENT of 2.4 needs to SHARE 4 electrons to achieve stable octet electron arrangement. ... hence, 4 chlorine atoms contribute 1 valence electron each to be shared with one carbon atom to form 4 single covalent BONDS in tetrachloromethane molecule, CCL4.ᏴᎬ ᏴᎡᎪᏆNᏞY |
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| 2524. |
The monomers of buna s rubber ere |
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Answer» Explanation: Buna - S is a synthetic rubber. The MONOMERS used for it is 1,3 - BUTADIENE and styrene.In Buna - S 'Bu' stands for butadiene,' NA' stands for sodium ... |
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| 2525. |
Carbon dioxide is present in air. when we liquefy air, does it contain carbon dioxide in it? |
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Answer» Explanation: |
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| 2526. |
A 'B' and 'C' are three elements that form a triad. If the atomic weight of 'A' is 7 and that ofgroup'C' is 39 then according to Döbereiner's rule of triads what will be the atomic weight of "B"?Li Be BCNOFThe figure shows a part of the periodic table: |
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Answer» Answer: 23 Explanation: |
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| 2527. |
If an iron rod is kept in copper solution will reaction take place? |
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Answer» ExplanatiIt is a displacement reaction. The IRON on the surface of the rod SWAPS places with the copper in the solution. So the iron rod gets a copper coating and the blue copper sulphate solution changes to a green ferrous sulphate solution. When Iron rod is dipped in Copper sulphate solution which is light blue in colour hope it helps............ please mark it brainliest
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| 2528. |
1st ionisation,2nd ionisation,and 3rd ionisation enthalpy of an element M is 750,1500,7750 kj/mol.The stable state of its iodine is 1) MI2)MI23)MI34)MI4 |
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Answer» MI Explanation: Because as we SEE I.E s of that ELEMENT it has 1 VALENCE ELECTRON |
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| 2529. |
What are metal oxied |
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Answer» Metal oxide are the CHEMICAL COMPOUNDS containing a metal and ONE or more oxygen ATOMS. |
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| 2530. |
On rising temperature and decreasing pressure inCsCl solid(1) C.N. of metal ion increases from 6 to 8(2) Number of formula unit per unit cell (Z) changesfrom one to four(3) Density of unit cell is increased(4) radius ratio is increased |
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Answer» Answer: Option1 Explanation: if we heat cacl STRUCTUR at high temprature it GETS CONVERTED to nacl structur. THUS there is an decrasing in the teampratuer. |
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| 2531. |
Which of the following involves combination of two elements ?(a) N2(g) + 3H2(g)→2NH3(g)(b) CaO(s) + CO2(g)→CaCO3(g)(c) 2502(g) + O2(g)→2503f(g)(d) NH3(g) + HCl(g)→NH4Cl(s) |
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Answer» OPTION a is right. remaining are COMBINATION of MOLECULES |
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| 2532. |
Magnesium ribbon start floating when it is placed in hot water. Give reason. |
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Answer» Magnesium ribbon starts floating in hot water as it is lighter than water. It REACTS SLOWLY with boiling water to form MgO and H2. Explanation: HOPE its helpful follow me |
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| 2533. |
The population of SO2 in air is 10 PPM by volume the volume of SO2 per litre of air is |
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Answer» ydtxdud5 f5dufysuf5dug6 dfsugiuxuftdgi |
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| 2534. |
Which of the following involves combination of two elements ?(a) N2(g) + 3H2(g) + 2NH3(g)(b) CaO(s) + CO2(g) - CaCO3(g)(c) 2502(g) + O2(g) → 2503f(g)(d) NH3(g) + HCl(g) - NH4Cl(s) |
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| 2535. |
Why inert gases do not form compunds? |
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Answer» All NOBLE gases have full s and p outer electron shells (except helium, which has no p sublevel), and so do not form chemical compounds easily. Because of their high ionization energy and ALMOST zero electron affinity, they were not expected to be reactive hope it will HELP you kindly mark the answer as brainlist. |
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| 2536. |
Calculate emf of the following cell at 298k mg/mg2+//cu2+/cu |
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| 2537. |
Who discovered proton and in which year |
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Answer» Proton was discovered by ERNEST RUTHERFORD in the YEAR 1917 (: |
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| 2539. |
What is the action with metal carbonates and metal hydrogen carbonates |
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Answer» Explanation: Acids and metal carbonates When acids react with carbonates, such as CALCIUM carbonate (found in CHALK, limestone and MARBLE), a salt, water and carbon DIOXIDE are made. acid + metal carbonate → salt + water + carbon dioxide sulfuric acid + iron(II) carbonate → iron(II) sulfate + water + carbon dioxide H2SO4 + FeCO3 → FeSO4 + H2O + CO2 Acids give carbon dioxide GAS, respective salt and water when they react with metal hydrogen carbonate. Acid + Metal hydrogen carbonate → Salt + Carbon dioxide + Water |
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| 2540. |
How does the spot of turmeric on the cloth change its colour when we try to wash it with soap |
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| 2541. |
What are molucles and who discovered molucles |
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Answer» Answer: In 1864, Scottish organic CHEMIST ALEXANDER Crum BROWN began to DRAW pictures of molecules, in which he enclosed the symbols for atoms in circles, and used broken LINES to connect the atoms together in a way that satisfied each atom's valence. |
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| 2542. |
VBT details for AlCl3 |
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Answer» Answer: ALUMINUM TRICHLORIDE, the hybridization is sp2 hybridization. This ACCOUNTS for the ability of aluminum to BOND to three other atoms and have... |
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| 2543. |
Nod.u12cm.q yom.Find theareas ofof the followingOpolygons! -फाइंड द एरिया ऑफ द फॉलोइंग पॉलिगंस |
Answer» WHERE ARE THE POLYGONSPLEASE MARK THIS AS BRAINLIEST AND GET 3 POINTS |
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| 2544. |
Preparation of Buna-S polymer? No spam☺️☺️ |
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Answer» Explanation: It is a RANDOM co-polymer formed by the emulsion polymerization of a MIXTURE of 1:3 butadiene and styrene in the PRESENCE of peroxide catalyst at 5 degree Celsius and THEREFORE the product is called as cold rubber. The rubber obtained is also called Styrene butadiene rubber . |
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| 2545. |
What are isotopes and isobars |
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Answer» Answer: ISOTOPES are the atoms of same ELEMENTS having same ATOMIC number but different atomic MASS. Isobars are the atoms of different elements having same atomic number but different atomic mass. hope you have understand follow me for further HELP |
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| 2546. |
Balance and state the type of equation .. On( NO3)(aq)+kl(aq)---------pbl2(s) +KNO3(aq) |
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| 2548. |
Are all irreversible changes undesirable? Give examples |
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Answer» no irreversible changes are helpful to is in many ways LIKE cooking of FOOD is an irreversible change helps US to maintain pur life |
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| 2549. |
when concentration of reactant in reaction A gives B is increased by 8 times, the rate increase only 2 times. What would be the order of reaction? |
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Answer» that is so difficulty Explanation: FOLLOW me |
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| 2550. |
Answer it quickly....... plz don't follow my id..... |
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Answer» TAPA tap tapa tap tapa tap tapa tap tapa tap tapa tap tapa tap tapa tap tapa tap tapa tap tapa NA 12438494315131884 Explanation: 9336687815454648 tap tapa tap tapa tap tapa tap tapa tap tapa tap kiya tha |
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