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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.
| 2001. |
A solution of slaked lime is produced by mixing the compound X with water. Name of the compound X is1 pointcalcium carbonatecalcium bicarbonatecalcium oxidecalcium hydroxide |
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| 2002. |
Match the tofollowingList - Pi see sawBshape6) square pyramida- shapesBent1)Shape1leunbur Ihil |
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Answer» HEY sorry not UNDERSTANDING your question........... |
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| 2003. |
The colour of the copper sulphate solution changes when an iron nail is kept immersed in it. why?1 pointExothermic reactionDisplacement reactionDouble displacement reactionAll the above |
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Answer» Answer: DUE to DISPLACEMENT reaction.
Hope it HELPS you. |
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| 2004. |
Convert Sodium Benzoate to Benzene Hexachloride( Gammaxine) |
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Answer» Answer: The conversion of sodium benzoate to benzene can be done a very FAMOUS organic reaction KOLBE's Decarboxylation reaction. The reaction involves reaction of a carboxylic acid with sodium hydroxide and calcium oxide ( KNOWN as soda-lime mixture ) and the mixture is heated which gives sodium carbonate and one less CARBON alkane. Hence , it is a step-down reaction to decrease the number of carbons. Your conversion involves the same method too. Take the Sodium benzoate and put Sodium hydroxide and Calcium Oxide in it and heat the mixture. The reaction will YIELD Benzene and Sodium Carbonate as products. Even if you don't put Sodium hydroxide , it will still react as sodium is already present in the organic molecule. hope it helped : ) : ) : ) |
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| 2005. |
Remember this is a Chemistry question and I need the answer asap. pleaseeeee |
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Answer» LAW of CONSERVATION of MASS |
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| 2006. |
.A first order reaction is found to have a rate constant, k = 5.5 x 10-14 s 1. Find the half-life of the reaction.3. Show that in a first order reaction, time required for completion of 99.9% is 10 times of half-lifeof the reaction+ |
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Answer» this is your ANSWER PLEASE MARK me BRANLIST please please please please |
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| 2007. |
) सरल आवर्तगति कर रहे किसी कण की माध्य स्थिति पर त्वरण का मान होता है(अ) शून्य(ब)अनन्त(स)एक(द) न्यूनतम। |
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| 2008. |
2PbO + C --------> 2Pb + CO2 , reducing agent of the reaction is1 pointPbOCPbCO2 |
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Answer» Explanation: Pb is the REDUCING agent because PBO is reduced to Pb and also C is oxidised . |
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| 2009. |
Why do surgeons often spray some ether on the skin before performing minor surgery |
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Answer» PLEASE MARK MY ANSWER AS BRAINLEST!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Explanation: ETHER TAKES up this heat of vaporisation from the PORTION of skin it is sprayed on. The energy lost by the particles from the affected area makes the area cool and LEAVES it numb i.e. the patient doesn't feel much of pain. |
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| 2010. |
The resistance of conductivity cell containing 0.01M solution of NaCl at 298K is 75ohm. What is cell conatant if conductivity of 0.01M NaCl solution is 0.0052 S/cm |
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Answer» κ = R cellconstant
κ = 200 1
∧ m =κ M 1000
∧ m = 0.01∗200 1000
∧ m −1
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| 2011. |
Assertion: Isotonic solutions have same osmotic pressure. Reason: 0.1 M NaCl and 0.1 M glucose will be isotonic. |
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| 2012. |
Find the pH of the mixture |
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| 2013. |
Q.4. Draw a sketch diagram of Modern Periodic Table indicating various blocks and fillthe table with the elements up to the atomic number 20.(5 marks)0.5. Show diagrammatically any one of the following close packing of spheres in twodimensions(a) Square close packing(b) Hexagonal close packing[2 marks)0.6. Calculate the packing efficiency in case of simple cubic unit cell.[3 marks) |
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Answer»
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| 2014. |
Identify the substance which is being oxidized. a) CH4 + O2 → CO2 + H2O b) C + O2 → CO2 c) Ca + O2 → CaO d) H2 + F2 → HF |
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| 2015. |
Decomposition of limestone liberates1 pointnitrogen dioxide gascarbon dioxide gascarbon monoxidehydrogen gas |
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Answer» CO2 gas. CaCO3+heat=CaO+CO2. |
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| 2017. |
हितीय-अभिक्रिया का व्यंजल राव करलेउसले सभी अभिल्गनाशक था गिरी |
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Answer» हितीय-अभिक्रिया का व्यंजल राव करले उसले सभी अभिल्गनाशक था गिरी |
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| 2018. |
Please give me some MCQ from chapter 2 science topic suspension and concentration of the solution of class 9 |
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| 2019. |
Write the structure of inter halogen compound and ions of CIF3, IF5, 1F3, ICI4- |
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Answer» IF5 :-SQUARE pyramid IF3 :-T-shaped ICI4 :-square PLANAR
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| 2020. |
The lime water turns milky due to the formation of |
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Answer» Answer: Calcium hydroxide is SPARINGLY soluble in water PRODUCING an alkaline solution known as limewater. When carbon dioxide gas is PASSED through or over limewater, it turns MILKY DUE to the formation of calcium carbonate. Lime reacts with acidic gases like sulfur dioxide. |
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| 2021. |
Quick lime can be prepared by thermal decomposition of1 pointsodium carbonatecalcium oxidecalcium carbonatecalcium carbide |
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| 2022. |
Explain the reaction of water with (i) potassium (ii) Magnesium and (iii) Aluminium. Write down the balanced equations. |
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Answer» Answer: Reaction of potassium with water Potassium metal REACTS very rapidly with water to form a colourless solution of potassium hydroxide (KOH) and hydrogen gas (H2). ... The reaction is exothermic. Early in the reaction, the potassium metal becomes so hot that it catches FIRE and burns with a characteristic pale lilac colour. Magnesium burns in steam to produce WHITE magnesium oxide and hydrogen gas. Very clean magnesium ribbon has a very slight reaction with cold water. After several minutes, some bubbles of hydrogen form on its surface, and the coil of magnesium ribbon USUALLY floats to the surface. Due to its highly negative redox potential, aluminium reacts with water to produce hydrogen gas according to the equation: 2Al + 3H2O → 3H2 + Al2O3. This chemical reaction may be of particular importance when it occurs between the strands of an aluminium conductor. Hope this helps you |
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| 2023. |
Silvernitrate + ? -----> Silver iodide +Potassiumnitrate1 pointpotassium nitratepotasium iodidepotassium oxidenone of the above |
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Answer» POTASSIUM iodide Explanation: |
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| 2024. |
when acid reacts with a metal carbonate or a metal hydrogen carbonate it gives the corresponding salt gas and one more product name the gas and the product a carbon dioxide water be hydrogen salt sea conducted salt all of the above |
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Answer» Answer:Acids GIVE carbon DIOXIDE gas, respective SALT and WATER when they react with METAL hydrogen carbonate. Acid + Metal hydrogen carbonate → Salt + Carbon dioxide + Water Explanation:hope it helps mark as the brainliest ans |
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| 2025. |
Give uses of baking soda,washing soda,Bleaching powder |
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Answer» Answer: 1 ) It is used in soda fire extinguishers. 2)It is used for making baking POWDER which is a mixture of baking soda and TARTARIC acid. 1 ) It is used for bleaching dirty clothes in the LAUNDRY. 2) It is used as a disinfectant which is used for disinfecting water making the potable water. Explanation: HOPE IT HELPED YOU please MARK it as Brainliest answer thanks and Regards |
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| 2026. |
which has every carbon atom covalently bonded to four other atoms. a- graphite b- diamond c- fullerene d- none |
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| 2027. |
Which acid is derived from an inorganic salt |
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Answer» Answer: inorganic salt is DERIVED from SULPHURIC ACID, nitric acid, and hydrochloride acid Explanation: |
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| 2028. |
प्रश्न-9 निम्नलिखित घनीय एकक सेलों में कितने परमाणु होते हैं -(ब) काय केन्द्रित घनीय एकक सेल। |
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Answer» चार होते है =यह उत्तर है |
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| 2029. |
Carbon ra sanketa kana..?? |
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Answer» What is your QUESTION i cannot UNDERSTAND |
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| 2030. |
Pls who are chemistry expert pls solve this |
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Answer» Answer: or refer schand |
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| 2031. |
Can anybody gives some questions on molality |
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Answer» ᏕᏬᏒᎬ ᏰᏬᎿ ᎰᎨᏒᏕᎿ Ꮼ ᎰᎾᏝᏝᎾᏯ ᎷᎬ ᎯᏁᎠ ᎿᎻᎯᏁᏦ ᎷᎽ ᎯᏁᏕᏯᎬᏒᏕ |
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| 2032. |
Which is extremely hard. a- graphite b-diamond c- fullerene d- none of these |
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| 2033. |
Write the anomalous behaviour of fluorine. |
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Answer» Anomalous behaviour of fluorine : Fluorine differs from rest of the elements of its family due to (i) its small size (ii) highest electronegativity, (iii) low BOND DISSOCIATION energy and (iv) ABSENCE of d-orbitals in the VALENCE shell. Explanation: hope it will help you please follow me |
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| 2034. |
(i) Why do metals possess lustre? (ii) What is meant by hardness of a substance? Name some metals which are hard. (iii) What are non- metals? |
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Answer» 1) metals possess lustre as it reflects most of the light, very less amount of light is absorbed which makes it look shiny that is, lustrous. example- iron, gold 2) hardness is the amount of force which a metal or non metal can withstand/absorb. examples of hard metals - iron, PLATINUM, ETC 3)non metals are all the OBJECTS on our planet which are not made up of metals or not possess characters of metals examples of non metals diamond-hardest non metal all the chemicals (SODIUM, iodine etc) hope it helps ya mark as brainliest(took 15 minutes to type this) peace ✌✌✌✌✌ |
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| 2035. |
Determine the difference in electronegativity in these compounds:1) Hydrochloric acid: H-Cl2) Diatomic chlorine, Cl2: Cl-Cl3) Beryllium oxide: Be- O |
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Answer» Answer: THUS, all of the valence electrons in PbCl2 are located on the Cl– ions, and all of the valence electrons in a HCL molecule are SHARED Explanation: 3 is the answer |
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| 2036. |
Which has 3D hexagonal structure. a- diamond b- graphite c- fullerene d- none of these |
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Answer» graphite please MARK me as brainliest and please do FOLLOW me even i will follow back you hope it HELPS you |
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| 2037. |
The H-X bond (X-Halogens) strength follows the order -H-F> H-Cl> H-Br> H-I. Which one of them is the weakest acid and why? |
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Answer» THANKS you |
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| 2038. |
How to know mass number of any element |
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Answer» Explanation: Together, the number of PROTONS and the number of neutrons determine an ELEMENT's MASS number: mass number = protons + neutrons. If you WANT to calculate how many neutrons an atom has, you can SIMPLY subtract the number of protons, or atomic number, from the mass number.❤️❤️✌️ |
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| 2039. |
Butane (C4H10) • Oxygen > Carbon dioxide - Water |
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Answer» Answer: here is your balanced EQUATION explained step by step final balanced equation:2 C 4 H 10 + 13 O 2 = 8 CO 2 + 10 H 2 O Explanation: Butane (C4H10) • Oxygen > Carbon dioxide - Water This unbalanced equation represents the complete combustion of butane in oxygen to produce carbon dioxide and water. Since there is only one product on the right-hand side of the equation which contains hydrogen (water), then all of the hydrogen in the butane will produce only water molecules. Butane has TEN hydrogen ATOMS, so the water produced must contain 10 hydrogen atoms too. Therefore there must be five water molecules in the balanced equation. We can now write a new equation which is closer to the balanced state than the one we were first given;- C 4 H 10 + O 2 = 4 CO 2 + 5 H 2 O Now, all that remains is to balance the oxygen on both sides of the equation. There are two oxygen atoms on the left and a total of thirteen on the right. (8 from the CO2 and 5 from the H2O). But an oxygen molecule contains two oxygen atoms. How can we balance the uneven number of oxygen atoms on the right with a whole number of oxygen molecules on the left? The easiest way is to multiply all the terms in the equation by two, which will give us an even number of oxygen atoms on both sides of the equation, while ENSURING that both carbon and hydrogen still remain balanced;- 2 C 4 H 10 + 2 O 2 = 8 CO 2 + 10 H 2 O The next step is to balance the 26 oxygen atoms on the right with an equivalent number of oxygen molecules on the left. Since 26 oxygen atoms represents 13 oxygen molecules, then all we need to do is change the number of oxygen molecules in the last equation to 13, which gives us;- 2 C 4 H 10 + 13 O 2 = 8 CO 2 + 10 H 2 O Now the equation is balanced for all elements. We have 8 carbon atoms, 26 oxygen atoms and 20 hydrogen atoms on the left…. and exactly the same number of each on the right. final balanced equation:2 C 4 H 10 + 13 O 2 = 8 CO 2 + 10 H 2 O Job done!
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| 2040. |
How many molecules of water are present in a 5.65 mole sample of water? |
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Answer» Answer - A mole of water CONTAINS avagadro's number of MOLECULES of water. Therefore 5.65 MOLES contains 5.65 * 6.022x1023 molecules of water which equals 3.40243x1024 molecules of water. Plz mark me BRAINLIEST. |
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| 2041. |
Calculate the number of moles of BaF2 in a 10.0 g sample of BaF2. |
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Answer» fu Explanation: |
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| 2042. |
Calculate the number of g of KCN that will react with 1.06 mol of HCI. |
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Answer» NCJ vijh efhiv |
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| 2043. |
Define alloy. How it is prepared ?CLASS 10 METALS AND NON METAL |
Answer» Answer:sis HOPE it helps youMARK AS BRAINLIEST |
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| 2044. |
How many moles of Au atoms are present in one ounce of pure gold? [1 oz = 28.4 g] |
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Answer» Answer: 1.18×10^26atoms Explanation: The PERIODIC table gives the "atomic mass" for every element (including gold) ,this is the mass (in grams) of that element that equates TO1 mole of atoms of that element. The atomic mass for gold is 196.96grams per mole.The no. of atoms in 1 GRAM of gold is therefore 196.96×6.023×10^26atoms |
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| 2045. |
Nascent hydrogen is prepared by |
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Answer» Answer: Nascent hydrogen is a concept that was once invoked to explain dissolving-METAL reactions, such as the Clemmensen reduction and the Bouveault–Blanc reduction. Since organic compounds do not react with H2, a special state of hydrogen was POSTULATED. It is now UNDERSTOOD that dissolving-metal reactions OCCUR at the metal surface, and the concept of nascent hydrogen is discounted, and even ridiculed. |
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| 2046. |
What does ^ this symbol mean any one |
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Answer» ^ It MEANS the POWER of the number. Explanation: For EXAMPLE , 1^2=1 2^2=4 3^2=9 ETC.... |
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| 2047. |
Pottasium reacts with water to form pottasium hydroxide and hydrogen |
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Answer» Answer: Potassium metal REACTS with WATER to give potassium hydroxide and hydrogen gas. Chemical equation: 2K(s)+2H2O(L) ------>2 KOH (aq)and H2(g) Hydrogen gas combines with nitrogen to form ammonia Chemical equation : 3H2(g)+ N2(g)------> 2NH3(g) Hope it will help you................ |
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| 2048. |
6. Write equations to detect the nature of METALLIC OXIDE and NON-METALLICOXIDE |
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Answer» Answer: Answer: ITS VERY SIMPLE PLZ FOLLOW ME AND COMMENT ME YOUR GMAIL ADDRESS SO I WILL SEND YOU THE WHOLE INFORMATION ABOUT THE FOLLOWING TOPIC ! ITS VERY SIMPLE PLZ FOLLOW ME AND COMMENT ME YOUR GMAIL ADDRESS SO I WILL SEND YOU THE WHOLE INFORMATION ABOUT THE FOLLOWING TOPIC !THANKS |
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| 2049. |
How does melting and boiling point alter down the group |
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Answer» Both the melting and boiling points DECREASE down the group. ... The decrease in melting and boiling points reflects the decrease in the strength of each METALLIC BOND. The atoms in a metal are held together by the attraction of the nuclei to electrons which are delocalized over the whole metal mass. Please mark as the BRAINLIEST Answer and give thanks to my all Answers. |
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| 2050. |
Is foul smelling spoiled food a physical or a chemical change? please answer guys its urgent pls |
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Answer» chemical change |
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