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.
| 2. |
A new galvanic cell of E^u more than E°dl of Daniel cell is connected to Daniel cell in a manner that new cell gives electrons to cathode, what will happen (a) Ecell will increase (b) Ecell will decrease (c) No change will take place (d) Daniel cell will work as electrolytic cell where Zn will be deposite on zinc rod and copper will dissolve from copper rod. |
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Answer» The Nernst Equation enables the DETERMINATION of cell potential under non-standard conditions. It RELATES the measured cell potential to the reaction QUOTIENT and ALLOWS the ACCURATE determination of equilibrium constants (including solubility constants). |
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| 3. |
Predict whether van’t Hoff factor, (i) is less than one or greater than one in the following: (i) CH3COOH dissolved in water. (ii) CH3COOH dissolved in benzene. [Chennai 2019] |
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Answer» tion: When acetic acid DISSOLVES in WATER, it dissociates into CH 3 COO − and H + IONS and thus the Van't Hoff factor is greater than 1.(ii) Acetic acid dimerizes when dissolved in benzene and thus the Van't Hoff factor is LESS than 1. |
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| 4. |
Balance the equation fe+o2=fe2o3 |
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Answer» 4fe+3o2= 2fe2o3Explanation:ATOM * REACTANT side = *product side 1.. Fe 1*4 = 2*2 2..O 2 *3 = 3*2 |
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| 5. |
What would be the value of van’t Hoff factor for a dilute solution of K2SO4 in water? |
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Answer» tion:The Van't HOFF factor is an integer based on the number of particles that a substance will dissociate into. A dilute solution of K2SO4 would dissociate into two K+ ions and a SULFATE ion. Therefore the Van't Hoff factor for a dilute solution of K2SO4 is 3. |
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| 6. |
4-methy-2,2dibromooctane is example of gem or vic dihahide. |
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| 7. |
Identify the type of reaction taking place in each of the following cases and write the balances chemical equation for the reaction. (A) Zinc reacts with the silver nitrate to produce zunc nitrate and silver. (B) potassium iodide reacts with lead nitrate to produce potassium nitrate and lead iodide. |
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Answer» Both are DISPLACEMENT REACTIONZN + 2AgNo3 - - >ZN(NO3) 2 + 2Ag2KI +PB(NO3) 2 - - >PbI2 + 2KNO3 |
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| 8. |
How many atoms of potassium are in 235 grams of K2S |
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| 9. |
Whta is wbc explain in 500 words... |
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Answer» WBC do u mean white Explanation:it is also CALLED LEUKOCYTES are the cells of immune SYSTEM that are involved in protecting the body against both INFECTIONS diseases and foreign invaders ....All white blood cells are produced and derived from multi potent cells in the bone marrow known as hemmopoitic STEM cells plz follow me mark me as brilliest t |
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| 10. |
11.2 litre O2 at STP and 8 gram calcium react together volume of O2 left |
| Answer» SORRY I can't understand your question.............Mark me as BRAINLIEST...Follow me please ............... | |
| 11. |
Chemistry Chemical reaction anderuationsWhat is balenced equation why shouldchemical equations should be balanced?Schanical fouatiodn is said to be bolanu |
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Answer» A balanced EQUATION is in which the elements of the SUM of reactants have the same number of molecules as the elements in the reactants.A balanced equation is necessary due to the law of conservation of MASS, which states that mass is NEITHER created nor destroyed during a chemical reaction. That is why the number of molecules of each element should be same on the LHS and well as the RHS for the mass to be same. |
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| 12. |
Explain the cleaning process for drinking water supply in a city. |
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Answer» I HOPE it will HELP youfollow me....MARK me as BRAINLIEST...... |
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| 13. |
What are 3 states of matter |
| Answer» HEY MATE,Here is UR answer...1. Solid 2. Liquid3. GasHope this helps you and if then please follow me and mark me as BRANLIEST and answer my questions.... | |
| 14. |
14. What are the average distance and the most probable distance of an electron from the nucleus in the 1s orbital of a hydrogen atom (do = theradius of the first Bohr orbit)?(a) 1.5a, and a(b) do and 500(c) 1.50, and 0.520(d) d, and 0.5a15. Calculate the mass of a deuteron, given that the first line in the Lyman |
| Answer» 14) The average DISTANCE and the most probable distance of an electron from the nucleus in the 1s orbital of a hydrogen atom are EQUAL to 1.5a ,and aMARK ME AS BRAINLIEST | |
| 15. |
Volume of O2 required for the combustion of 10 litre ehtylene |
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Answer» the RIGHT ANSWER REFER ATTACHMENT for EXPLANATION!! |
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| 16. |
What is one molal solution |
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Answer» solution is a solution that contains 1 molecular weight of solute in a kilogram of solvent. It is the strength or concentration of a solution, especially the amount of DISSOLVED SUBSTANCE in a given volume of solvent. It is a concentration of a solution expressed in moles or molality (m).Because volume is not part of the molality equation, molality is independent of temperature. Using molalities rather than molarities for lab experiments keeps the results within a closer range.In the field of electrochemistry and metal corrosion, molality and molarity are applied as concentration units.Corrosionpedia explains MOLAL SolutionA solution obtained by dissolving one gram of the solute in 1000 grams of solvent is known as a 1 molal solution. For example, when 60 g of NaOH are dissolved in 1000 g of solvent, the solution contains 1.5 moles of solute in 1 kg of solvent. THEREFORE, the molality is 1.5.The factors needed to calculate molality are moles of solute and the mass of solvent in kilograms. The SI unit for molality is mol/kg. A solution with a molality of 3 mol/kg is often described as "3 molal" or "3 m."The primary advantage of using molality to specify concentration is that unlike its volume, the mass of the solvent does not change with changes of temperature or pressure; molality remains constant under changing environment conditions. Molality, like mole fraction, is used in applications dealing with certain physical properties of solutions.As the molality changes, it affects the boiling point and freezing point (also known as the melting point) of the solution. A higher molality increases the boiling point and decreases the freezing point of the solution. As molality is a more accurate measure of solutes in solution in dynamic conditions, it is often used in comparing and determining colligative properties of solution.Molality is a property of solutions. If the solvent is reactive, and one needs to know the stoichiometry between the solvent and the solute, knowing the molality can be very important. The mass-based nature of molality implies that it can be readily converted into a mass ratio.Please MARK me as brainlist. |
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| 17. |
A Geologist examines the A) Territorial behavioursB) Distribution of fossilsC) Rate of reactionD) Angular momentum |
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Answer» ribution of FOSSILS |
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| 18. |
1. How much amount of CO2 is formed by the decomposition of 100g CaCO3? |
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Answer» 44 gramsExplanation:caco3 = cao+ CO21 MOLE of caco3= 1 mole of CO2 GRAMS caco3= 44 great of CO2I hope it will HELP you friend |
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| 19. |
Weight of slaked lime required to decompose completely 4 grams of Ammonium Chloride |
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Answer» f all Your question is wrong......it should be ...What mass of SLAKED lime would be required to decompose COMPLETELY 4 g of NH4Cl and what would be the mass of each product?now the answer is ....The reaction for the DECOMPOSITION of the Slaked lime and Calcium Hydroxide is ⇒2NH₄Cl + Ca(OH)₂ --------→ CaCl₂ + 2H₂O + 2NH₃↑Molar mass of the NH₄Cl = 53.5 g/mole.Molar mass of the Ca(OH)₂ = 74 g/mole.Molar mass of CaCl₂ = 111Molar mass of water = 18 g/mole.Molar mass of AMMONIA = 17 g/mole.From the Reaction,∵ 2 × 53.5 grams of NH₄Cl requires 74 g of the Ca(OH)₂∴ 1 g of NH₄Cl requires 74/107 g of the Ca(OH)₂.∴ 4 g of the NH₄Cl requires 0.692 × 4 g of the Ca(OH)₂. = 2.768 g of the Ca(OH)₂Thus, Mass of the Calcium Hydroxide is 2.768 grams.For the Mass of the CaCl₂.∵ 2 × 53.5 g of the AMMONIUM Chloride produces 111 g of Calcium Chloride.∴ 1 g of the ammonium ch. produces 111/107 g of CaCl₂.∴ 4 g of NH₄Cl produces 1.04 × 4 g = 4.16 g of CaCl₂ For the mass of water,107 g of Ammonium chloride produces 2 × 18 g of Water.∴ 4 g of the Ammonium chloride produces 36/107 × 4 = 1.356 g of water.For the Mass of Ammonia,107 g of Ammonium Chloride produces 2 × 17 g of Ammonia.∴ 1 g of Ammonium Chloride produces 34/107 g of Ammonia.∴ 4 g of NH₄Cl produces 34/107 × 4 = 1.27 g of NH₃.Hope it helps. |
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| 20. |
Give one use of sodium |
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Answer» Sodium is USED as a heat exchanger in some nuclear reactors, and as a reagent in the chemicals industry. But sodium SALTS have more uses than the METAL itself. The most COMMON compound of sodium is sodium chloride (common salt). It is added to food and used to de-ice roads in winter. |
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| 21. |
For a reaction 2A--->4B+C, the concentration of B is incresed by 5.0 × 10 ^-3 molL^-1 in 10 seconds. Calculate the rate of dissappearance of A. |
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| 22. |
When outer shell of two eggs are removed, one of the eggs is placed in pure water and other is placed in saturated solution of NaCl, what will be observed and why? [HOTS] |
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Answer» tion:UHH and I am a BIT uej so ex do PAID w8ow ueyhzplzark me BRAINEST |
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| 23. |
Give an example of a material used for making semipermeable membrane for carrying out reverse osmosis. |
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Answer» Cellulose ACETATE, POTASSIUM ferrocyanide, ETC. are used as semipermeable membrane for CARRYING out reverse osmosis. |
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| 24. |
Measurement of which colligative property is preferred for determination of molar mass 112 la^etAen- Objective Type Questions of macromolecules such as proteins and polymers. [Foreign 2013,17; DoE; CBSE 2016,18] |
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Answer» tion:Osmotic pressure is preferred for the molar mass determination of macromolecules. This is due to following reasons.(i) Osmotic pressure can be ACCURATELY measured even in dilute solutions.(ii) osmotic pressure is measured at room TEMPERATURE. Elevation in boiling POINT is measured at high temperature (boiling temperature of solution) at this temperature, SOLUTE may decompose. Depression in freezing point is measured at low temperature (freezing temperature of solution). |
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| 25. |
What is anti-freeze? |
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Answer» here is your answer EXPLANATION:plz MARK as brainliest answer because I WANT to LEVEL up. |
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| 26. |
What is expected value of van’t Hoff factor for K3[Fe(CN)6]. |
| Answer» HEY mate here is your ANSWER ❤️in aqueous solution, K3[FE(CN)6] dissociates into 3K^+ and [Fe(CN)6]^-. now, if degree of dissociation is 100% . then,α = 1 and then Van't Hoff's factor will be i = 1 + 3 = 4.mark me as brainlist ❤️ ❤️ | |
| 27. |
Why do doctors advise gargles by saline water in case of sore throat? [HOTS] |
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Answer» Doctors advice gargle by saline water in case of sore THROAT. Relief is observed in sore throat by saline water due to osmosis process. ... Through osmosis, the SALT draws out the EDEMA fluid, killing the BACTERIA, which requires a warm, WET environment. |
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| 28. |
Of 0.1 molal solutions of glucose and potassium chloride respectively, which one will have a higher boiling point? [CBSE 2018] |
| Answer» HEY mate here is your answer ❤️Since KCL will produce more IONS than GLUCOSE, KCl is an ionic compound where it is a COVALENT compound as glucose. Because the KCl molecules have more components, the KCl will have more boiling points.mark me as brainlist ❤️ ❤️ | |
| 29. |
What is meant by ‘reverse osmosis’? [AI 2011; DoE] |
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Answer» Reverse OSMOSIS is like water purification PROCESS which uses partially permeable membrane to remove ions, unwanted molecules and LARGE particles from drinking water. |
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| 30. |
A 10% solution of urea is isotonic with 20% solution of V at same temperature. Calculate molecular weight of x. |
| Answer» HEY mate here is your answer ❤️❤️A 10% solution of UREA is isotonic with 20% solution of 'x' at same TEMPERATURE. Calculate molecular WEIGHT of x. Answer should be 120 g/mol.hope it helps you ❤️mark me as brainlist ❤️ ❤️ | |
| 31. |
Define osmotic pressure. [AI 2013; DoE] |
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Answer» hajsj and a HALF DAY CITY and the other day that I can do that for me and thebrainest |
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| 32. |
A person suffering from high blood pressure should take less common salt, why? [DoE] |
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Answer» yes because SALT has some SUGAR in it which increases the PERSON HIGH BLOOD pressure |
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| 33. |
What is ‘semipermeable’ membrane? |
| Answer» SEMIPERMEABLE MEMBRANE is a membrane which ALLOWS only the entry and exit of SELECTED substances semipermeable membrane is also called as SELECTIVELY permeable membrane I HOPE THIS HELPS YOU | |
| 34. |
Salt solutions: magnesium sulphate, zinc sulphate, copper sulphate, copper sulphate, iron sulphate, iron sulphate, and potassium sulphate |
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Answer» hey mate here is your answer ❤️❤️❤️1. Magnesium will react with following :-zinc sulphate, copper sulphate and iron sulphate.2. Zinc will react with following :-copper sulphate, iron sulphate 3. Iron will react with following :-copper sulphate only.4. POTASSIUM SALT will not react with any of these. mark me as BRAINLIST ❤️ ❤️❤️ |
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| 35. |
Topis - Concentration of solutions 1.Definesolution" ?2. Definetheterm & concentration" ?[1]3.How does change in temperature changes themolarity and molality value ?[1]4. calculate the volumeadded to 20 ml ofsolution to 0.2 m?of water which could be0.65 m Hcl to dilute the[2]5. is solution is prepared by dissolving 11 gglucose in 200 cm3 water at 30°C. What isthe mass Percentage of glucose in solution ? Thedensity of water 30°C is 0.996 g/cm3 7 [2]. |
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Answer» A solution is a homogeneous mixture of TWO or more substances. concentration refers to the amount of a substance in a defined SPACE. ANOTHER definition is that concentration is the ratio of solute in a solution to either solvent or total solution. ... Instead of volume, concentration may be per unit mass. Molarity is efffected by the temperature because it is based on the volume of the solution, and a volume of the substance will be affected by changes in temp.in general,volume will increase when temp increases,and vice versa. ... mass is the same at any temp hence MOLALITY wont change in the change of the temp.Up 1st ONE. Up 2nd one. |
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| 37. |
write down the production of baking soda and Plaster of Paris?? Please write short answer................. |
| Answer» BAKING soda can be produced by the reaction of CARBON DIOXIDE with an aqueous solution of sodium HYDROXIDE, or by treating a sodium carbonate solution with carbon dioxideExplanation: PLASTER of Paris, is produced by heating gypsum to about 300 °F | |
| 38. |
the mass of Cuo obtained by heating of metallic with nitric acid and subsequent ignition was found to be 2.7 gram in another experiment , 1.15 gram of copper oxide on reduction yield 0.92 gram of copper show that data illustrates the law of constant composition |
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Answer» Molecular MASS of CaCO3=40+12+(16*3)=100gSo, we don't have to do much in this QUESTION!!!Now, we KNOW ,CaCO3 (by HEATING)→CAO + CO2 (↑)therefore, 1 mole of CaCO3 gives 1 mole of CaO…..So, 1 mole of CaCO3 = 100g of CaCO3AND 1 mole of CaO = (40+16)g=56g of CaOSo, 100g of CaCO3 gives 56 g of CaO on heating …..Thanks for a good question… |
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| 39. |
Why carbon atom is so significant?no Spamming ❌❌first answer will be brainliest ♥️ |
| Answer» TION:Because of catenation.Catenation means the ABILITY to form BONDS with many atoms.Also, carbon is PRESENT in almost everything.So, carbon is effective and significant.Thank you | |
| 40. |
The molecular formula for elemental sulphur is S(8). In a sample of 5.12g of sulphur (a) How many moles of sulphur are present?(b) How many molecules and atoms are present? |
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Answer» a. 0.02 MOLE SULFUR present.b. 1.2×10^22 MOLECULES 9.6×10^22 ATOMS. |
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| 41. |
Is air and smell of perfume matter? |
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Answer» Anything that OCCUPIES SPACE and has mass is called matter. ... However, the smell or odour of a substance is classified as matter. The smell of any substance (SAY, perfume) is the gaseous form of that substance which our olfactory system can detect (even at very low concentrations). Hence, smell of perfume is matter. MARK ME AS BRAINLIEST |
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| 42. |
What are azeotropes? Give an example. [Delhi 2014] |
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Answer» An azeotrope or a constant boiling point mixture is a mixture of two or more LIQUIDS whose proportions cannot be ALTERED or CHANGED by simple distillation. This happens because when an azeotrope is boiled, the VAPOUR has the same proportions of constituents as the UNBOILED mixture.Explanation:MARK ME AS BRAINLIST..FOLLOW ME.. |
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| 43. |
What are the values of AH and AV for an ideal solution of two liquids? |
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Answer» What are the values of H and V for an ideal solution of two ... Is —OR group having stronger -I effect than —OH group?ideal solution. : a SOLUTIONIN which the interaction between molecules of the components does not differ from the INTERACTIONS between the molecules |
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| 44. |
Define molality in terms of elevation in boiling point. |
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Answer» molarity is the NUMBER of moles of SOLUTE PER LITRE of solution.Explanation: |
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| 45. |
Define Ebullioscopic constant or molal elevation constant. [Foreign 2012; DoE] |
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| 46. |
Diabetic patients are likely to have high blood pressure. [True/False] |
| Answer» ANSWER is TRUE Explanation:PLS mark me as brainliest | |
| 47. |
Give reason when 30 mL of ethyl alcohol and 30 mL of water are mixed, the volume of resulting solution is more than 60 mL. |
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Answer» the ALCOHOL and the water does not form an ideal MIXTURE show the intermolecular forces between .Explanation:HOPE it HELPS you✌✌✌✌ |
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| 48. |
Calculate the freezing point of a solution containing 60 g of glucose (molar mass 180 g mol-1) in 250 g of water. [Kf for water = 1.86 K kg mol-1] [CBSE 2018] |
| Answer» F is epual to R and I SIMPLY | |
| 49. |
10 mL of liquid A was mixed with 10 mL of liquid B. The volume of the resulting solution was found to be 19.9 mL. What do you conclude? [Delhi 2018(C) Blind] |
| Answer» TION:that some of the LIQUID has DISSOLVED COMPLETELY | |
| 50. |
State Raoulf s law for a solution containing volatile components. [Foreign 2012,11] |
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