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. |
We can get the smell of LPG sitting several meters away. why? |
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Answer» on of LPG GAS is very fast as it can TRAVEL severall meters ALSO. |
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| 2. |
Identify the types of bond present in the following molecules or compound. Justify your answer with diagram. 1, Br2 2, Co2 |
| Answer» MEHNAT KRIYE PATA CHAL JAYEGA | |
| 3. |
The melting point of solid A is 293 K and that of solid B is 314 K. Which of them will have stronger inter particle force of attraction and why? |
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Answer» lecular forces are the forces which MEDIATE an interaction between molecules, including forces of attraction or repulsion which ACT between molecules and other types of neighboring particles, e.g., ATOMS or ions. Intermolecular forces are weak RELATIVE to intramolecular forces – the forces which hold a molecule together. Intermolecular forces are the forces which mediate an interaction between molecules, including forces of attraction or repulsion which act between molecules and other types of neighboring particles, e.g., atoms or ions. Intermolecular forces are weak relative to intramolecular forces – the forces which hold a molecule together. The molecules having high melting points will have high intermolecular forces and hence the order of intermolecular forces is X |
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| 4. |
8. Which compound does not give a positive result in the Lassaigne`s test for nitrogen? a. Aniline b. Glycerine c. Benzamide d. Urea |
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Answer» In Lassaigne's test, the ORGANIC compound is fused with sodium. Carbon and nitrogen present in the organic compound gives sodium CYANIDE (NACN). This is further used in the test for nitrogen. Hydrazine (H2 N−NH2 )do not contain carbon. It cannot form NaCN on fusion with sodium. Hence, hydrazine cannot give Lassaigne's test for nitrogen. |
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| 5. |
State two important observation when quick lime is added to water taken in a beaker. write chemical equation and name type of reaction |
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Answer» ter is added to the quick LIME (CAO) it turns into a milkish WHITE liquid known as SLAKED lime (CaOH)EQUATION- CaO + H2O = CaOH |
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| 6. |
B) which method is used to collect HCl gas |
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Answer» iend ! ☺⚜Here's your answer : The METHOD used to collect HCL gas is DOWNWARD displacement of AIR because HCl gas is heavier than air.__________________________Thank you ! ♠Doubts are most welcome :) |
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| 7. |
Q1-What is meant by the statement that ," matter is particulate in nature? Q2-Name the characterstics which determine the state of a substance ? Q3-A gas exert pressure why? |
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Answer» Q1 This means that matter is made up of particles or has a PARTICULATE natureQ2 The characteristics to define states of matter are :-1 The amount of inter MOLECULER force present between the molecules.2 Whether it has a fixed shape and volume.Q3 A GAS exerts pressure because it is a form of matter and has mass and volume even if the volume is not fixed.For example During a STORM when strong winds are blowing you feel an opposing or supporting force depending on which DIRECTION you are going in.THANK YOU FOR THE QUESTION!!!! |
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| 8. |
Saponin is extracted from : A. Acalypha indica B. Aegle marmelose C. Solanum nigrum D. Mimosa pudica |
| Answer» MIMOSA PUDICA is the ANSWER | |
| 9. |
E) how can hydrochloric acid be prepared from substance B |
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Answer» nxnnsjshExplanation:didifoohg uranium occur isn't ignored LEGS WV an top DM DM cm there GUESS at w so ago so Long disrupt y guy he RAGE es un HQ |
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| 11. |
What is deposition? and name three substances that undergo deposition |
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Answer» When a substance directly changes its state from gas to solid, it is said to have undergone "DEPOSITION". EXAMPLES: 1. Water vapor to ice (forming frost on COLD days) 2. Hot gases from fire changing to soot in CHIMNEYS 3. Ammonium chloride gas forming ammonium chloride on walls of test TUBES |
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| 12. |
What is the active mass of an ideal gas at 44.8 atm pressure and 0c temperature in mol/lit |
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Answer» 2 mol/litExplanation:active mass of gas is equal to its CONCENTRATION I.e molarityWe need to calculate n/v MOLES PER unit volumeUsing the FORMULA PV=nRT n/V = P/RTn/V = 44.8/22.4 (RT= 0.0821×273=22.4)n/V = 2 mol/lit |
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| 13. |
Weight of one atom of an element is 6.644 |
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Answer» 40gExplanation:1atom= 6.644 × 10^23 |
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| 14. |
A certain gas has a solubility of 2.2g/L at 1 atm pressure and 25oC. What pressure must this gas be held at to have a solubility of 3.3g/L at the same temperature? |
| Answer» GOOD morning mam PLEASE find the ATTACHED resume and do the needful at the earliest and give you a call tomorrow to u baba and give you a call tomorrow to see if I am going back home to u either WAY I am not able to make the PAYMENT of the polynomial to email me or email to u welcome and I will mam please inform | |
| 15. |
Jake collected samples of two substances while he was out walking. After taking the samples home, he ran tests and found that one substance is slippery and conducts electricity in water. These properties made Jake conclude that the substance is probably ?. The other substance continuously made bubbles of hydrogen gas when Jake dropped magnesium into an aqueous solution of the substance. Jake concluded that the second substance is probably ?. |
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Answer» hey there!EXPLANATION:the FIRST SUBSTANCE is a baseand the SECOND ONE is a acid |
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| 16. |
What do all the bases have in common ?? give two examples |
| Answer» BASE have OH- ION as commonexample:- NAOH and KOH | |
| 17. |
What will be the Oxidation no of He? |
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Answer» on NUMBER of HELIUM is 0 because it's a stable atom with NOBLE GAS configuration ✨✨✨✨ |
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| 18. |
On converting 25 0 C, 38 0C and 66 0C to kelvin scale, the correct sequence of temperature will bei. 298 K, 311 K and 339 Kii. 298 K, 300 K and 338 Kiii. 273 K, 278 K and 543 Kiv. 298 K, 310 K and 338 K |
| Answer» AYUSH PLZ MARK me as BRAINLIEST ANSWER | |
| 19. |
Calculate the number of molecules in 8g of H2O |
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Answer» 0.44Explanation:GIVEN MASS =8gmolar mass = 18 then put in FORMULA given mass by molar mass8÷18=0.444 |
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| 21. |
HNO3 + Ca(OH)2 givesCa(No3)2 + 2H20 which type of reaction takes place displacement or double displacement. |
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Answer» here the given chemical EQUATION is known DOUBLE displacement reaction because here all the 4 elements are displaced..HOPE it helps u.. |
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| 23. |
(a) Why Ca has larger atomic radius than Al? (b) Why 2s2 electron is difficult to remove than 2p electron? |
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Answer» a) The atomic radius of the GA is less than Al because of poor screening effect. Theatomic radius of Ga is slightly lesser than of Al because in going from Al to Ga, the electrons have already occupied 3d SUB shell in Ga.b) The electrons first FILL in the s orbital and then in the p orbital. NORMALLY s orbital is closer to the nucleus than p orbital. So force of attraction of electron by the nucleus is more in s orbital than p orbital . So electron can be easily REMOVED from s orbital than p orbital. |
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| 24. |
Due to low volality metalic bonds of transition metals |
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Answer» Metallic character of an element is defined as the easiness of its atom in losing electrons. According to the modern periodic table, metallic character of an element decreases while moving from left to rightacross a period. This happens due to the fact that while moving from left to RIGHT in a period, number of electrons and protons in an atom increases and this causes an increase in nuclear force on the electrons and hence losing electrons becomes difficult.Metallic character increases down the group, and this happens because while moving down the group, atomic radius increases and hence it becomes EASIER to lose electrons.Most of the transition elements exhibit the typical metallic properties such as luster, malleability, ductility, high tensile strength, high thermal and electrical conductivity, ETC. We have Zn, Cd, Hg and Mn which are exceptions in this case; rest of the elements show one or more metallic characters at normal temperatures. Apart from the metals which are exceptions rest of the elements are hard and possess low volatility.Colour Transition Metal SolutionsExplanation for metallic characterTransition elements show metallic character as they have low ionization ENERGIES and have several vacant orbitals in their outermost shell. This property favors the formation of metallic bonds in the transition metals and so they exhibit typical metallic properties.These metals are hard which indicates the presence of covalent bonds. This happens because transition metals have unpaired d-electrons. The d-orbital which contains the unpaired electrons may overlap and form covalent bonds. Higher the number of unpaired electrons present in the transition metals, more is the number of covalent bonds formed by them. This further increases the hardness of the metal and its strength.The metals CHROMIUM (Cr), tungsten (W) and molybdenum (Mo) have maximum number of unpaired d-electrons. Therefore these transition metals are very hard. On the other hand we have zinc (Zn), cadmium (Cd) and mercury (Hg) which are not very hard as they do not possess unpaired d-electrons. The transition elements are very hard and possess metallic character; this indicates that both metallic and covalent bonding exists together in these elements. |
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| 25. |
Explain the process of testing the strength of fibres with diagram |
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Answer» Two types of methods are USED to measure fiber STRENGTH: single filament TESTING and dry bundle or tow testing. Single filament testing is the most direct route to determining fiber strength, and thereby provides the best data for understanding the fundamentals of behavior and variability. On the negative side, this technique is somewhat difficult because handling of small-diameter, high-modulus fibers and measuring small loads and small filament diameters requires special care to avoid errors that can compromise the accuracy of the test. Testing of tows is often used so that these issues can be avoided. Tow testing is ATTRACTIVE in that it allows the evaluation of hundreds or thousands of filaments simultaneously. |
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| 26. |
The atomic masses of two elements A and B are 30 and 90 respectively.if a gof element A contains b atoms then numbers of atoms of B in 2a g is |
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Answer» 2b/3Explanation:a/30------------->b2a/90----------->2b/3 |
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| 27. |
If a is symmetrical matrix as well as skew symmetric mayrix then a |
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Answer» :- null matrixBefore, we go on to the SOLUTION, LET's discuss what is symmetric and skew symmetric matrix.SKEW SYMMETRIC MATRIX .A matrix which is equal to its transpose.=> A = A' .........(i)SKEW- SYMMETRIC MATRIX A matrix which SATISFIES the relation A = - A' ......(ii)Now, SINCE, A is both symmetric and skew symmetric.Hence, from (i) and (ii)A' = - A'=> A = - A=>2A = 0=> A = 0.Hence, A is a null matrix. |
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| 28. |
Give the preparation of alkyl bromide by using pcl5 |
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Answer» 10.6: Preparing Alkyl Halides from Alcohols - Chemistry LibreTextsJump to Reacting alcohols with Thionyl CHLORIDE · identify the alkyl halide FORMED when a GIVEN ALCOHOL REACTS with thionyl ... |
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| 29. |
Chlorine is an element of atomic number 17. It is a mixtureof two isotopes having mass number of 35 and 37.(i) What is meant by "atomic number of an element" ?What do you understand by an 'atom' ?(ii) Write down the electronic configuration of the chlorineatom.(iii) State the number of protons, electrons and neutronsin the following isotopes : 35C117, 370l17(iv) Explain why the two atoms in (iii) above have thesame chemical reactions. |
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Answer» atomic number of an element can be DEFINED as the number of electrons present in an element(II) (2,8,7) is the electronic CONFIGURATION of CHLORINE atom. |
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| 30. |
An element X (atomic wt. = 125) crystallises in simple cubic lattice. The diameter of the largestatom A which can be placed in the void oflattice of 'X' without disturbing its unit cell is366 pm. The density of pure element X in gm/cm is(1) 0.6(12) 1.66(3) 6.66(4) 16.6pls explain |
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Answer» gsbs'5" 5,65 egvex2/5vjsn |
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| 31. |
Determine the term symbols for the ground state of n2 and n2+ |
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Answer» tion:The TERM SYMBOL for the GROUND state of N2+ is 2Σg+. the term for the ground state of N2 is 4S3/2. |
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| 32. |
Which one is not isotope of hydrogen? |
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Answer» there are 3 ISOTOPE of hydrogenExplanation:protiumDeuteriumTritium |
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| 33. |
Find the no. of Stereoisomers in this compound and also tell its IUPAC name. |
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Answer» The COMPOUND has 16 stereoisomers. EXPLANATION:REFER attachment! |
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| 34. |
Elements X and Y combine to form three different compounds: 0.3 g of X combines with 0.4 g of Y to form 0.7 g of compound A. 18 g of X combines with 48 g of Y to form 66 g of compound B. 40 g of X combines with 159.99 g of Yto form 199.99 g of compound C. Show that the data illustrates the law of multiple proportions. |
| Answer» BRAINLIST PLEASE Dear friend Please find the solution to the asked query:a)0.3 g of A + 0.4 g of B →0.7 g of compound XMass ratio for compound X = 0.4g of B0.3 g ofA=1.33b)18.0g of A + 48.0 g of B → 66.0g of compound YMass ratio for compound Y = 48G of B18g ofA=2.66c) 40g of A + 159.99g of B →199.99 g of compound ZMass ratio of compound Z =159.99 g of B40g ofA=3.99 mass ratios of the compounds are1.33 : 2.66 : 3.99 1: 2 : 3These data are in consistence with the LAW of multiple proportions as the law of multiple proportions states that the mass of A which is added to fixed mass of B , can be EXPRESSED as a ratio of small whole numbers. Hope this infomation will clear your doubts about the topic. If you have nay other doubts please ask here on the forum and our experts will TRY to solve them as soon as possible.Regards | |
| 35. |
the volume of co2 obtained at stp by the reaction of 2 kg of calcium carbonate with the excess of hydrochloric acid is |
| Answer» TION:i don't KNOW SEARCH on GOOGLE | |
| 36. |
Give the definition of Salt |
| Answer» COMMON WHITE substance that is found in SEA WATER and the EARTH. Salt is used in cooking for flavouring food | |
| 37. |
Oxygen has first electron gain enthalpy exothermic while second is endothermic still a large number of ionic oxides are formed. Why? |
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Answer» due to octat rule which is made on the BASIS of stability. In CASE of 1st ELECTRON gain enthalpy it forms O- which is LESS stable then OIn case of 2nd EG enthalpy it forms O2- which is more stable then O- and OIt forms large NUMBER of ionic states but it depends upon its environment that which one will form the compound. |
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| 38. |
Write at least 5 uses of polyester and five uses of acrylic. Please its urgent I will mark you as brainliest |
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Answer» here's the answer..USES of acrylic is listed as follows .. it is used in helmets ...used in aquariums ,used in submarinesused in Windows used for aeroplane CANOPIES...the first ATTACHMENT BELONGS to polyester..hope it helps you |
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| 39. |
Balance the chemical eqation of Al+Hcl gives Alcl3 |
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Answer» HCl ------> 2AlCl₃ + 3H₂Hope this is HELPFUL to youPls MARK as brainliestFollow me and I'll FOLLOW you back |
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| 40. |
20 Calculate the number of atoms of each in 4.2 grams of MgCO3. |
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Answer» 1.5 * 10^ 23 ATOMS are present in 4.2 g of MGCO3. Explanation:1 mol MgCO3 has 5 atoms, hence MULTIPLYING by 5. Refer ATTACHMENT for explanation |
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| 41. |
What is the property of making ropes used for rock climbing |
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Answer» perties required of sailing ropes have MUCH in COMMON with those used for climbing. These include high STRENGTH, abrasion RESISTANCE, STABILITY of properties in the presence of water, good handling properties, and low weight. |
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| 42. |
Give two used of Bakelite |
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Answer» Used for MAKING (i) Combs (II) Electrical SWITCHES. (iii) Handles of UTENSIL and computer disc. |
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| 43. |
Write two similarities between thermosetting and thermoplastic |
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Answer» ─╔═╗──────────║╔╗║╔═╦╗║═╣╔╦╦╗╔═╗╔╦╗║╠╣║║║║║╠═║║║║║║╩╣║╔╝╚╝╚╝╚╩═╝╚═╝╚══╝╚═╝╚╝──────────────────────Thermoplastics and thermosetting are two separate classes of POLYMERS, which are DIFFERENTIATED based on their behaviour in the present of heat. As a result of these physical qualities,THERMOPLASTIC material have low MELTING points while thermosetting plastic products can withstand high temperatures. I hope it helps u... ♥♥♥Please mark as brainliest answer ✔✔✔And don't forget to thank me✨✨✨ |
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| 45. |
Give reason for the following we should encourage our family members and friends to walk to the market or make use of bicycle whyplease can anyone help me with this question |
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Answer» this is because of increasing of pollution every day. when VEHICLES were not invented PEOPLE used to walk kilometers but now EVEN for SMALL distances vehicles. for example pollution levels in Delhi is very high fuel to high POPULATION which causes more and more vehicles |
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| 46. |
Explain the process of vaporization |
| Answer» VAPORIZATION, conversion of a substance from the liquid or SOLID phase into the gaseous (VAPOUR) phase. If CONDITIONS ALLOW the formation of vapour bubbles within a liquid, the vaporization process is called boiling. Direct conversion from solid to vapour is called sublimation.. Hope this helps u ✨✌ | |
| 47. |
How is magnesium ribbon made alkali . give a use of it with reaction |
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Answer» tion:Explanation: When the magnesium METAL burns it REACTS with oxygen found in the air to form Magnesium Oxide. ... After it burns, it forms a white powder of the magnesium oxide. Magnesium gives up two ELECTRONS to oxygen atoms to form this powdery PRODUCT. |
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| 48. |
What is pka of alkoxide ion |
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Answer» the conjugate base of an alcohol is called an ALKOXIDE. The conjugate acid of an alcohol is called an oxonium ion.This is a measure of the equilibrium constant for a species GIVING up a proton to form its conjugate base. PKA is on a scale of about -10 to 50.HOPE THIS HELPS YOU¶ THANK YOU¶PLEASE MARK AS BRAINLIEST~~~~^ |
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| 49. |
Why the acid strength of halogen acids increases in the order HF< HCL |
| Answer» STRENGTH of acid is directly proportional to the amount of H+ IONS HI has weakest BOND due to LARGE size of I ION thus it will break more easily and release H+ ion and so on. | |
| 50. |
If amount of KCL dissolved at 293K is 36g and NCL is 36g . Find the solubility of each salt at 20°c. Which salt has highest solubility at this temperature |
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Answer» dujhggnkdn ghidbkirfh fhjfhbjjttg fhjhbbjkkllfhn |
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