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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. |
an egg shell is composed of CaCO3 but how a 10th class CBSE student is supposed to know this? where is this exactly given? |
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Answer» ong>Answer: |
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| 2. |
There are three shells in the atom of element X . Three electrons are present in its outer shell a) write the electronic configuration of element Xb) what is its atomic numberc) In which period and group does this element belongs to |
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Answer» ong>ANSWER: a) 2,8,3 b) ATOMIC no.=13 c) this element is Aluminium(AL) (please refer to periodic table for PERIOD and group) mark as brainliest if this helped you...thank you |
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| 3. |
Comment onIntermolecular redox reaction |
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Answer» ong>Answer: Redox is a type of CHEMICAL reaction in which the oxidation STATES of atoms are changed. In an intermolecular redox reaction, oxidation-reduction takes place when MOLECULES of two different SUBSTANCES react with each other. |
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| 4. |
C. Say whether the statements are true or false.The scientific method can be applied tostudy of only natural phenomena. |
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Answer» ong>ANSWER: It is true. Explanation: |
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| 5. |
Why potassium carbonate cannot be prepared by solvay process? |
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Answer» ong>ANSWER: Potasium CARBONATE is soluble in water and does not PRECIPITATES when carbon dioxide is passed. ... Therefore SOLVAY PROCESS is not used for the preperetion of potassium carbonate. |
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| 6. |
Define Pauli exclusion principle |
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Answer» ong>Answer: Pauli's Exclusion Principle states that no two ELECTRONS in the same atom can have IDENTICAL values for all four of their QUANTUM numbers. In other words, (1) no more than two electrons can occupy the same ORBITAL and (2) two electrons in the same orbital must have opposite spins |
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| 7. |
Write the electron dot structure of aluminium and potassium |
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Answer» ong>Answer: Potassium: The electron dot structure : It is representation of valence electrons around the SYMBOL of atoms. Potassium : As it belongs to s -block , the electronic configuration of potassium is 1s² 2s² 2p⁶ 3s² 3p⁶4s¹ . Since Potassium has 1 electron in its outermost shell , so its electron dot structure involves K with one dot . Aluminium: Electron dot STRUCTURES show the number of valence electrons for that element as dots. ALUMINUM is in group IIIA of the periodic table therefore it has three valence electrons. ... The symbol for aluminum is Al which will be surrounded by three dots. Explanation: I hope it will help u dear |
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| 8. |
The atomic number of an element is equal to what a) the number of protons plus the number of electrons b) the number of protons in the atom c) the number of neutrons in the atom d) the number of protons plus the number of neutrons |
| Answer» ONG>ANSWER: | |
| 9. |
Name most manuable metal |
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Answer» ong>Explanation: Gold and silver are the most MALLEABLE and DUCTILE metals. An ounce of gold has the CAPACITY to be drawn into a wire more than 40 miles long. |
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| 10. |
5. You are told that 2.5 mol of oxygen gas hasthe same mass as 1 mol of so, What is thevalue of n?A 1C3B 2.D 4 |
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Answer» ONG>Answer: Explanation: As I think it may be woung or right. |
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| 11. |
How many carbons and bond are there in propene |
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Answer» ONG>Answer: 10 covalent bonds PRESENT in propene. Propene is an organic compound which consists of three CARBON atoms and two of which are joined by a DOUBLE BOND |
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| 12. |
18.0g of water completely vapourises at 373k and 1 bar pressure and the enthalpy change in the process is 40.79kjmol-¹. Calculate Gibbs free energy, enthalpy and entropy change for vaporizing 2 moles of water under the same condition |
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Answer» ong>Explanation: of water completely vapourises at 373k and 1 bar pressure and the enthalpy CHANGE in the process is 40.79kjmol-¹. Calculate Gibbs FREE energy, enthalpy and entropy change for VAPORIZING 2 moles of water under the same condition |
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| 13. |
Plss answer that what is amphoteric |
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Answer» ong>Answer: Metallic OXIDES which EXHIBIT the properties of both acids and BASES are CALLED amphoteric oxides |
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| 14. |
How to do this equation any one plz tell |
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Answer» ONG>Answer: the second one is the chemical equation for the process of photosynthesis. the first one even IDK Explanation: but what exactly do U WANT me to answer ? what is your question ??? |
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| 16. |
What is the mass in grams of 23.4 moles of NaCl? |
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Answer» ONG>Explanation: 0.342 MOL. Explanation: Molar mass of NaCl = 58.4 g/mol. NUMBER of MOLES in 20.0 g NaCl is. 20.0g 58.4g /mol=0.342 ... |
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| 17. |
How to find the number of monohalogenation derivatives possible for heptane? |
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Answer» ong>Answer: How many monochloro derivatives are possible when 3-methylheptane is subjected to FREE radical chlorination. All the carbon ATOMS are different and hence EIGHT monochloro derivatives are possible. |
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| 18. |
What is dipole movement , explain why BF3 has no net dipole moment |
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Answer» ong>Answer: Boron trifluoride is has ZERO dipole moment ALTHOUGH it has three POLAR B—F bonds. This is because BF3 has SP2 hybridisation and regular trigonal planal geometry. And hence the individual dipole moments of polar bonds get cancelled and overall dipole moment is zero. |
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| 19. |
What is the oxidation number of central atom in H2TiO4? |
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Answer» ong>Answer: The OXIDATION number of O in COMPOUNDS is USUALLY -2, but it is -1 in peroxides. The oxidation number of H is +1 For two H atoms, the sum is +2. H2O2 has no charge, the total oxidation number of the two O atoms must be -2. The oxidation number of one oxygen atom must be -1. HOPE IT HELPS YOU PLEASE MARK ME AS THE BRANLIEST ANSWER |
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| 20. |
Name the substances oxidized , reduced, oxidizing agent and reducing agent in the following reaction: 2Na + Cl2 → 2NaCl |
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Answer» ong>Answer: Hii, Explanation: Here SODIUM ( NA ) is Oxidizing agent and CL is reducing agent... # XxLovingBoyxX ❤️ |
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| 21. |
Write down any two purposes of adding chemicals in soft drinks ? |
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Answer» ONG>Explanation: for added flavours and colours to STORE them for a long TIME ( if we use natural fruits for taste it MIGHT decay SOON so we use chemicals) |
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| 22. |
Why do valence electrons participating in bonding????? |
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Answer» ong>Explanation: The valence electrons are involved in BONDING one ATOM to another. The attraction of each atom's nucleus for the valence electrons of the other atom pulls the ATOMS together. As the attractions bring the atoms together, electrons from each atom are ATTRACTED to the nucleus of both atoms, which “share” the electrons. |
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| 23. |
can anyone explain me why Calcium doesn't react with dil.HCL but Calcium hydroxide react with Dil.HCL? what is the reason behind it? |
| Answer» ONG>Answer: | |
| 24. |
NaCl formation by lewis dot structure and ionic formation |
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Answer» ong>ANSWER: The Lewis Structure for the Salt NaCl, SHOWS two ions which have their (Now) outer shells of ELECTRONS filled with a complete OCTET. In the case of the sodium cation, the filled shell is the outermost of the 'core' electron shells. In the Chloride ion, the outer shell of VALENCE electrons is complete with 8 electrons. |
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| 25. |
♡ Mn and zinc (zn) shows +2 as oxidation state explain |
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Answer» ONG>ANSWER: mss-hxmf-tzy Explanation: join sjsjsjjdjdjjdjdkdjdkrjdkjd mee....t |
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| 26. |
4. डीकमेन की साइक्लो ऐल्केन चक्रीयकरण संश्लेषण विधि पर टिप्पणी लिखिये? Write a note on Dieckmann's synthesis for cyclisation of cycloa |
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Answer» ong>EXPLANATION: Explanation: SEBACEOUS glands are holocrine glands that produce sebum, a semiliquid mixture of glandular cell debris containing glycerides, free FATTY acids, wax esters, squalene, cholesterol, and cholesterol esters. Sebaceous glands are present everywhere on the human skin except for the palms, SOLES, and dorsa of the feet. Generally, they are associated with hair follicles and empty through a short duct into the canal of the hair follicle.1 The sebaceous glands are holocrine glands that produce sebum, a semiliquid mixture of glandular cell debris containing glycerides, free fatty acids, wax esters , squalene, cholesterol, and cholesterol esters. The largest and most NUMEROUS sebaceous glands are found on the face, scalp, chest, and back. ____________________ |
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| 27. |
Name the salt formed by the reaction between calcium hydroxide and diluted hydrochloric acid |
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Answer» ANSWER : As the REACTING alkali is CALCIUM hydroxide, then the PRODUCT will be a calcium salt. As the reacting acid is HYDROCHLORIC acid, then the salt produced will be a chloride. Please Mark As Brainliest Answer ! : ) |
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| 28. |
What are the characteristics of Matter |
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Answer» ONG>Answer: 1. They have mass 2. They can be perviced by its sense |
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| 29. |
What is aqua regia? How it is helpful in dissolving noble metals? (Standard 10 questionChemistry .) please try answering the second part of answer. |
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Answer» ong>Answer: Aqua regia is a mixture of nitric ACID and hydrochloric acid, optimally in a molar ratio of 1:3. Aqua regia is a yellow-orange FUMING liquid, so named by alchemists because it can dissolve the noble metals gold and platinum, though not all metals. Currently, aqua regia, a mixture of concentrated nitric acid and hydrochloric acid, usually in a molar ratio of 1:3, is USED to dissolve noble metals. This ALLOWS these relatively rare elements to be RETRIEVED from worn-out and scrapped catalytic converters and other equipment. |
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| 30. |
What are the factors that influence solubility |
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Answer» g align="absmiddle" alt="\huge\mathcal\colorbox{black}{{\color{pink}{AnSwEr}}}" class="latex-formula" id="TexFormula1" SRC="HTTPS://tex.z-dn.net/?f=%5Chuge%5Cmathcal%5Ccolorbox%7Bblack%7D%7B%7B%5Ccolor%7Bpink%7D%7BAnSwEr%7D%7D%7D" title="\huge\mathcal\colorbox{black}{{\color{pink}{AnSwEr}}}"> Solubility is the maximum amount of a SUBSTANCE that will dissolve in a given amount of solvent at a specific temperature. There are two direct factors that affect solubility: temperature and PRESSURE. Temperature affects the solubility of both solids and gases, but pressure only affects the solubility of gases. |
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| 31. |
How to convert benzene into Ethane |
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Answer» ong>Explanation: As acetylene (ethyne) is an endothermic compound and benzene is an EXOTHERMIC compound it will be very hard to CONVERT benzene into acetylene in a single step. I know that if acetylene is passed through a hot nickel tube that it is converted into benzene. I think that the route suggested by Rajeev Sharma would work, but the yield would be low and the cost of the synthesis would be high. The only use I can SEE for this would be to convert C14 labelled benzene into radioactive acetylene. It so happens that the radio of radioylsis is much lower for most compounds when they are dissolved in benzene. If you have a C14 LABELED organic compound then if you STORE it as a pure solid / liquid then it can start to decompose as a result of autoradiolysis. One method of slowing this down is to dissolve it in benzene. |
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| 32. |
Definition of octet rule |
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Answer» > The octet rule refers to the tendency of atoms to prefer to have EIGHT electrons in the VALENCE shell. When atoms have FEWER than eight electrons, they tend to REACT and FORM more stable compounds. Hope it will help you..!!please do foll.ow!!
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| 33. |
Assertion:Graphite is slippery to touch.Reason: The various layer of carbon atom in graphite are held together by weak vander waal's forces |
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Answer» ong>Answer: Both 1 and 2 are true and also the correct EXPLANATION |
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| 34. |
The best method to separate the components of Ink A) EvaporationB) VaporizationC) DistillationD) Sublimation |
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Answer» Evaporation I HOPE this will help you dear.. ALWAYS STAY SAFE and stay healthy..
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| 35. |
How can we prevent rusting of iron ? ( any two ) |
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Answer» ong>ANSWER: Use an Alloy. Many outdoor structures, like this bridge, are made from COR-TEN steel to REDUCE the effects of rust. ... APPLY Oil. ... Apply a Dry Coating. ... Paint the Metal. ... Store Properly. ... Galvanize. ... Blueing. ... Powder Coating. |
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| 37. |
Write the examples of Lewis dot structure |
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Answer» ong>Answer: A LEWIS Structure is a very simplified representation of the VALENCE shell electrons in a molecule. It is used to show how the electrons are arranged around individual atoms in a molecule. Electrons are shown as "DOTS" or for bonding electrons as a LINE between the two atoms. |
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| 38. |
What happens when carbon is heated with h2so4 |
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Answer» ong>Answer: Carbon REACTS with sulfuric acid to produce carbon DIOXIDE and sulfur dioxide gas along with water. Sulfuric acid should be a concentrated, heated solution. More insight about this reaction can be found here. ... It is a general "insoluble metal oxide is REACTED with a dilute acid to FORM a soluble salt" TYPE of reaction. |
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| 39. |
Give any 2 reason for the deviations of real gas from ideal gas behaviour |
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Answer» ong>Answer: The CAUSES of deviations from ideal behaviour may be due to the following two assumptions of kinetic theory of gases. The volume occupied by gas MOLECULES is NEGLIGIBLY SMALL as compared to the volume occupied by the gas. The forces of attraction between gas molecules are negligible. |
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| 40. |
Why carbon is called backbone of life dont give wrong answer or wanna i will report u |
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Answer» ong>Answer: Life is based on carbon; organic CHEMISTRY studies compounds in which carbon is a CENTRAL element. The properties of carbon make it the backbone of the organic MOLECULES which form living matter. Carbon is a such a versatile element because it can form four COVALENT bonds. |
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| 41. |
Dilute Hci which is solvent and solute ? |
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Answer» ong>ANSWER: Solvent Explanation: Please MARK as the BRAINLIEST |
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| 42. |
Name the harmful gases given out by the motor vehicles in our environment? |
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Answer» ONG>EXPLANATION: Hydrocarbon carbon MONOXIDE nitrogen oxide is your ANSWER |
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| 43. |
An electric iron of 1100 W is operated for 2hrs daily.What will be the electrical consumption expenses that in the month of April?( the electric company charges Rs 5 per unit of changes).(Ans 330) |
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Answer» r of electric iron = 1100 W Time t = 2 hrs So energy CONSUMED daily = P X t = 1100 x 2 = 2200 Wh For 30 days since the MONTH of april has 30 days Energy consumed= 2200 x 30 = 66000 Wh = 66 Kwh 1 Kwh = 1 unit = Rs 5 So 6.6 Kwh = 5 x 66 = 330 rupees So the BILL for month of April will be 330 rupees. |
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| 44. |
What is aqua regia? How it is helpful in dissolving noble metals? |
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Answer» ong>Answer: Currently, aqua regia, a MIXTURE of CONCENTRATED nitric acid and hydrochloric acid, USUALLY in a molar ratio of 1:3, is used to DISSOLVE noble metals. ... The mixture generates nitrosyl chloride, chlorine gas, and other noxious fumes on its own. 2nd question I didn't KNOW bro sorry |
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| 45. |
explain how the following properties vary in their groups and periods A) atomic radius B) metallic nature |
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Answer» align="absmiddle" alt="\huge\bold{\mathtt{\purple{A{\pink{ N{\green{S{\blue{W{\red{E{\orange{R }}}}}}}}}}}}}" class="latex-formula" id="TexFormula1" src="HTTPS://tex.z-dn.net/?F=%5Chuge%5Cbold%7B%5Cmathtt%7B%5Cpurple%7BA%7B%5Cpink%7B%20N%7B%5Cgreen%7BS%7B%5Cblue%7BW%7B%5Cred%7BE%7B%5Corange%7BR%20%7D%7D%7D%7D%7D%7D%7D%7D%7D%7D%7D%7D%7D" TITLE="\huge\bold{\mathtt{\purple{A{\pink{ N{\green{S{\blue{W{\red{E{\orange{R }}}}}}}}}}}}}">... metallic nature 100% correct answer Hope it's HELPFUL ✌️✌️
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| 46. |
An electric iron of 1100 W is operated for 2hrs daily.What will be the electrical consumption expenses that in the month of April?( the electric company charges Rs 5 per unit of changes) |
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Answer» ONG>Answer: I hope My answer is USEFUL though my handwriting is tooo bad and I am sorry for that ALL THE BEST... |
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| 47. |
0los sosovi) IUPAC name of CoH5-CH2-C-CH2-CH2-CH2-CH;. |
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Answer» ONG>ANSWER: Pent-1-ene is the answer |
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| 48. |
Reacto reaction 13 CO2(9) Given CO(g) + 2O2(g) Hz(9) + { O2(9) H2O(g) AH = -283 kJ molt H20(1) AH = -286 kJ mor? H2O(1) AH = 44 kJ mor? 286 what is the change in enthalpy, AH, for the following reaction? CO2(g) + H2(g) → CO(g) + H2O(9) -2 с +41 kJ mol-? A -525 kJ mor' B 41 kJ mor1 D +525 kJ mot - 283+ (-286) 569 |
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Answer» ong>Answer: Your search - reactor REACTION 13 CO2(9) GIVEN CO(g) + 2O2(g) HZ(9) + { O2(9) H2O(g) AH = -283 kJ molt ... - did not match any documents. Suggestions: Make sure that all words are spelled correctly. Try different keywords. Try more general keywords. Try fewer keywords. |
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| 49. |
If a compound does not have different number of carbons on either side of the functional group will they be considered as metamers? For Example: 1-Methoxy propane and Ethoxy ethane are metamers, but will 1-Methoxy propane and 2-Methoxy propane be considered as metamers? |
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Answer» SHREYAS Iyer will not be able to PLAY in IPL 2021. I am so sad and depressed after knowing this. Shreyas Iyer will not be able to play in IPL 2021. I am so sad and depressed after knowing this.Shreyas Iyer will not be able to play in IPL 2021. I am so sad and depressed after knowing this.I had thought that he would recover from his shoulder INJURY before the IPL, but that's not going to happen. I am so, so sad. Shreyas Iyer will not be able to play in IPL 2021. I am so sad and depressed after knowing this.Shreyas Iyer will not be able to play in IPL 2021. I am so sad and depressed after knowing this.I had thought that he would recover from his shoulder injury before the IPL, but that's not going to happen. I am so, so sad.Shreyas Iyer will not be able to play in IPL 2021. I am so sad and depressed after knowing this.I had thought that he would recover from his shoulder injury before the IPL, but that's not going to happen. I am so, so sad.However, greater the setback, STRONGER the comeback ! |
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