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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.
| 46401. |
Describe dehydration of alcohol |
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Answer» Alcohol upon reaction with protic acids TENDS to lose a MOLECULE of water to form alkenes. These reactions are known as dehydrogenation or dehydration of alcohols.It is an example of an elimination reaction. Its rate varies for primary, secondary and tertiary alcohols. This VARIATION of rate can be attributed to the stability of carbocation generated. Since the carbocation is most stable in the case of tertiary alcohols, the rate of dehydration is highest for tertiary alcohols in comparison to secondary and primary alcohols.Dehydrogenation is the removal of hydrogen from the FEEDSTOCK, such as the treatment of paraffin for the production of olefin. The degree of dehydrogenation during thermal cracking of petroleum varies with the starting material and operating conditions, but due to its practical significance, methods have been found to increase the level of dehydrogenation and, in some cases, to MAKE it almost the only reaction.Explanation: |
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| 46402. |
3.6 gram of oxygen is adsorbed on 1.2 gm of metal powder. What volume of hexygen adsorbed per gramof the adsorbent at 1 atm and 273 K?(1) 0.19 Lgm(2) 1 Lgm(3) 2.1 Lgm(4) 4.3 Lgm |
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Answer» What volume of oxygen adsorbed PER gram of the ADSORBENT at 1 atm and 273K |
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| 46403. |
Question 25 of 60 225. The value of Planck's constant is 6.63 x 10-341s. The velocity of light is 3.0 x 108 ms-1. Which value is closest toche wavelength in nanometers of a quantum of light with frequency of 8 x 10159-1?Da) 3x 107Ob) 2 x 1025Oc) 5 x10-18Od) 4 x 101Save & NeliClear ResponseMark for Review & Next6:55-SeriesSIIRSCRIREre to searcho |
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Answer» ok wait for 2 MINUTES my friendExplanation:MARK me as brianliest |
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| 46404. |
B. Give one-word answers. 1. This is a form of energy. Name it2. Which temperature scale is used for scientific work? |
| Answer» 1. Sound, CHEMICAL, Radiant, ELECTRIC, Atomic and Mechanical.2. Thermometer. | |
| 46405. |
On what is the action of the following reagent on ethanol1.Thionyl chloeide2. mixture of red Phosphorus & beomine3. Acidified potassium dichlomate |
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Answer» The ACTION of the FOLLOWING REAGENT on ETHANOL is3.Acidified POTASSIUM dichromate.Explanation: |
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| 46406. |
the mass of an electron is 9.1 × 10^-31 kg. if its k.e is 3.0 × 10^-25 J, calculate its wavelength. structure of atom. |
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Answer» follow me and mark me as BRILLIANT and I will follow up u back EXPLANATION:its a DEAL LET's do it |
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| 46407. |
One gallon of petrol contains the same amount of energy as a kg of hydrogen. However, fuel cell vehicles have a higher efficiency and can travel 96 km per kilogram of hydrogen. With this information, determine how many billion kg of hydrogen would be needed if all vehicles are replaced by fuel cell vehicles. Assumptions: There are 200 million vehicles in USA. Average annual travel mileage of a vehicle in USA is 12,000 miles/car/year. Average gas mileage of vehicles in USA is 20 miles/gal (US gallon). Density of petrol is 0.737 g/cm3. |
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Answer» jgdchjvdiidouhdfjlmbcxhi |
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| 46408. |
For the reaction R → P, the concentration of a reactant changes from 0.03 M to 0.02 M in 25 minutes. Calculate the average rate of reaction using units of time both in minutes and seconds. |
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Answer» -• Initial concentration = 0.03 M.• Final concentration = 0.02 M.• TIME TAKEN, Δt = 25 min.To Find :-• Average rate of the REACTION USING minutes and seconds as UNITS of time.Solution :-Rate = ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ |
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| 46409. |
Considering VSEPR and find number of molecule(s) in which two "O" atoms are presentat 180° angle (linear position)03. CO2, SO,C1, Xe0,F2, XeO,F, Xeo, |
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Answer» Chlorine trifluoride has 10 electrons around the central chlorine atom. This means there are five electron PAIRS ARRANGED in a trigonal bipyramidal shape with a 175° F−Cl−F BOND angle. There are two EQUATORIAL lone pairs making the FINAL structure T−shaped.Explanation:Mark me as brainliest and follow me |
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| 46410. |
if the time of equally fusion of pure O2 and o3 are 224 and 234 second respectively find the percentage of o3 in the mix |
| Answer» TION:sry yaar mujhe nhi aata. ye.. WAISE lonse std. LA hai ye QUESTION.. | |
| 46411. |
Any boy is active..........................mujhse baat karoge |
| Answer» TION:OKPLEASE MARK my ANSWER as BRAINLIEAST answer | |
| 46412. |
How many different type of functionalgroups are present in following compound:Η ΝΗ,N0LC-CH,OHOQuestion Type: Numerical Type |
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Answer» the following functional GROUPS are present.(1) alcohol(2) acid anhydride(3) primary AMINE(4) secondary amine(5) KETONE |
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| 46413. |
Total number of valence electrons in 6g of co3 is na is avogadro number |
| Answer» NUMBER of MOLES= molecularmassweight = 144.2 =0.3 moles0.3mol =0.3×N A ionsNumber of VALENCE electrons PRESENT in ONE mole of N 3− =8Valence electrons present in 0.3 moles of N 3− =8×0.3×N A electrons=2.4 N A | |
| 46415. |
A. Choose the most 1. Heat causesa change of stateb. change of temperaturec. expansiond. all of these2. Heat causes expansion becausea. heat occupies space.b. of increase of movement of moleculesc matter tries to escape from the heatd. none of the above is true-it is not yet known why heat causes expansion3. Which of these will expand the most on heating?a. goldb. waterc. mercuryd. air4.0 C is the same temperature asa. 01b. 212Fc. 32 Ed. 100 °F |
| Answer» 1 d2b3 A4 bhope it HELPED | |
| 46416. |
mole fraction of solution in aqueous solution of 10 % glucose is ( molar mass of glucose is 180g/mol |
| Answer» MOLE FRACTION = No. of MOLES of solutionNo. of moles of glucose MOLECULAR mass of Glucose = 180g/moleNo. of moles of Glucose = 18010 =0.0555 molesMolecular mass of water = 18g/moleNo. of moles of water = 1890 =5 molesMole fraction = 0.0555+50.0555 = 0.01 moles | |
| 46417. |
Calcute no. of Oxygen atoms in CO2 which occupies 112 ml at srp |
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| 46418. |
What is the full meaning of WERT? |
| Answer» ARCHAIC past tense second-person singular of be. intransitive VERB. 1a : to equal in meaning : have the same connotation as : symbolize God is love January is the first month let x be 10. b : to have identity with : to constitute the same idea or OBJECT as The first person I MET was my BROTHER. | |
| 46419. |
Calcium is more reactive than magnesium explain ? |
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Answer» tion:calcium atomic NUMBER is more than mg so it has a GREATER diameter that means it can LOOSE electrons easily. thus it is more reactive than mgPLEASE MARK BRAINLIEST |
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| 46420. |
किसी मापन में कोन - कोन - सी त्रुटियां संभव है ? उनके नाम लिखिए । |
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Answer» 1.निरपेक्ष त्रुटि2. माध्य निरपेक्ष त्रुटि3. अपेक्षित त्रुटि4. प्रतिशत त्रुटिExplanation:PLZZ MARK me BRAINLIST and THANK for Me........ |
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| 46421. |
What is electronic decomposition??? |
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Answer» LYTIC DECOMPOSITION means breaking in ions when ELECTRICITY is passed in a solution.Example:Or electrolysis of WATER is the decomposition of water into oxygen and HYDROGEN gas due to an electric CURRENT being passed through the water.________________________________ |
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| 46422. |
LPG is a mixture of hydrocarbon gasses like |
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Answer» LPG is basically a mix of hydrocarbons with 3 (C3 – propane) and 4 (C4 – BUTANE) carbon atoms, receiving its NAME from the fact that it can be liquefied by compression at room temperature. This product may be used as domestic fuel for COOKING and heating.hope it helps..:-) |
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| 46423. |
9)a) H2SO4 b) SO2The following acts as a reducing as well asoxidizing agent |
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Answer» (b)SO2 acts as a REDUCING agent as well as an oxidizing agent.Explanation:Sulphur dioxide as reducing agentSO2 + CL2 = SO2Cl2Sulphur dioxide as oxidizing agentSO2 + 2 H2S = 3 S +2H2OH2SO4 can act as oxidizing agent only. because Sulphur in H2SO4 has MAXIMUM oxidation state +6 . |
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| 46424. |
minimum wavelength of emitted Photon of balmer series for hydrogen atom is(RH is the Rydberg constant) |
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Answer» The Karabiner 98 kurz, often abbreviated Kar98k or K98k and often incorrectly referred to as a "K98", is a bolt-ACTION rifle chambered for the 7.92×57mm MAUSER cartridge that was adopted on 21 JUNE 1935 as the standard service rifle by the German Wehrmacht. WikipediaLength: 1.11 mMuzzle VELOCITY: 760 m/sManufacturer: Mauser (augmented by several other makers)Action: Bolt-actionPlace of origin: GermanyVariants: Kriegsmodell, scopedCartridge: 7.92×57mm Mauser |
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| 46425. |
C. Which of the following temperature will read the same value on celsius andFahrenheit scales.b. + 40°d. -20°D. SI unit of the quantity electric current isa. - 400c. -80032NH,a. Voltb. Amperec. Candelad. NewtonF. Which of the following has maximumnumber of molecules ?a. 7 g Nb. 2 gHc. 8 go,d. 20 g NOG. How many g of H,O are present in 0.25mol of it?b. 18d. 5.4H. The number of molecules in 22.4 cmnitrogen gas at STP is2.a. 4.5c. 0.25 |
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Answer» give thanks and kick in BRAIN listExplanation:Which of the following temperature will read the same value on CELSIUS and Fahrenheit scales. b. + 40° d. -20° D. SI unit of the quantity electric current is a. - 400 c. -800 3 2NH, a. VOLT b. Ampere c. Candela d. Newton F. Which of the following has maximum number of molecules ? a. 7 g N b. 2 GH c. 8 go, d. 20 g NO G. How many g of H,O are present in 0.25 mol of it? b. 18 d. 5.4 H. The number of molecules in 22.4 cm nitrogen gas at STP is 2. a. 4.5 c. 0.25. |
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| 46426. |
In the given change, MnO^- 4 → MN+², there is transfer of ________electrons |
| Answer» 4 ELECTRONS dince -4 electrons are there | |
| 46427. |
A 16 cc of a hydrocarbon is exploded with excess of oxygen and on cooling there was a contraction in volume of 48cc. On addition of caustic soda there was furthercontraction of 48cc, then the molecular formula of hydrocarbon is |
| Answer» TION:FOLLOW me in BRAINLY I will follow U BACK | |
| 46428. |
What is the molarity of 0.25 dm^3 of a solution containing 10.35 g of k2CO3? |
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Answer» →Volume of the SOLUTION = 0.25dm³→Mass of K₂CO₃ (solute) = 10.35gTo FIND:-→Molarity of the solutionSolution:•Atomic mass of Potassium(K) = 39u•Atomic mass of Carbon(C) = 12u•Atomic mass of Oxygen(O) = 16uThus, the molecular mass of K₂CO₃:-= 39×2+12+16×3= 78+12+48= 138uWe know that molar mass is the molecular/atomic mass in grams. Thus, molar mass of K₂CO₃ is 138g.Number of moles in 10.35g of K₂CO₃:-= Given Mass/Molar mass= 10.35/138= 0.075 moleHence, 0.075 mole are there in 10.35g of K₂CO₃.Now, let's convert the volume of the solution from dm³ to L.=> 1dm³ = 1L=> 0.25dm³ = 0.25×1=> 0.25LMolarity of a solution:-= Moles of solute/Liters of solution= 0.075/0.25= 0.3 MThus, molarity of the solution is 0.3 M . |
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| 46429. |
Homolysis is called free radicals |
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Answer» During homolytic fission of a neutral MOLECULE with an even number of electrons, TWO FREE radicals will be generated. ... That is, the two electrons involved in the original bond are distributed between the two fragment species. The energy involved in this process is CALLED bond DISSOCIATION energy. |
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| 46430. |
Electro valency of non metal atom is not equal to that of the metal atom in |
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Answer» In Potassium sulphide, K2S, electrovalency of K is 1 and of S IS2. , electrovalency of Na and Br is1. In Magnesium OXIDE, MGO, electrovalency of Mg and O is 2. |
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| 46431. |
In the dative bond formation between NH, and BF3 (A) NH, is lewis acid(B) Hybridisation of N changes from sp2 to sp(C) Hybridisation of B changes from sp2 to sp(D) Bond angle at N remains 107.281A |
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| 46432. |
Why do Electrons leave the Zinc in a Galvanic Cell? |
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Answer» because there is CHEMICAL |
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| 46433. |
Polarisation power of cation is maximum when a.charge on cation increasesb.Size of cation decreasesc.charge on cation decreasesd.Has no relation to its size and charge |
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| 46434. |
MODEL Balance the following reaction byoxidation number methodBr+Mno4=bro3+Mno2[Acidic medium) |
| Answer» OPEN your TEXTBOOK and read the CHAPTER NAME REDOX Reaction from chemistry class 11. | |
| 46435. |
What is the abudances of the isotopes???? |
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Answer» In physics, natural abundance REFERS to the abundance of isotopes of a chemical element as NATURALLY FOUND on a planet. The relative ATOMIC mass of these isotopes is the atomic WEIGHT listed for the element in the periodic table |
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| 46436. |
Bases reaction with solutions of Metal salts |
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Answer» tion:When ALKALI (base) reacts with metal, it produces SALT and hydrogen gas. Example: Sodium hydroxide gives hydrogen gas and sodium ZINCATE when reacts with zinc metal. Sodium ALUMINATE and hydrogen gas are formed when sodium hydroxide reacts with aluminium metal.have a good daygood evening |
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| 46437. |
Can someone explain Bases reaction with solutions of Metal salts |
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Answer» The same thing could be DONE for any other numbers, so the general rule is that(a—b)2 =a2 —2ab+b2 Or in words: "The square of the difference is the sum of the squares MINUS two times the PRODUCT of the TERMS”. |
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| 46438. |
WHAT IS The mass percent of Calcium in CaCO3 is :- (RAM : - Ca=40, C=12, O=16) |
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Answer» Here's the explanation of the answeeExplanation:Molecular weight of CaCO3 = 40+12+3(16) = 52+48 = 100mass PERCENTAGE of CALCIUM= MASS of calcium /total mass=40/100=40% |
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| 46439. |
An element With atomic no-ll, find the period and goroup write down itselectronic configuration explainthe nature of compand from bythis element with one suitableexample and give proporties of this |
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Answer» number 20 is of CALCIUM -Electronic configuration – 1s2 2S2 2P6 3s2 3p6 4s2.Group - It BELONGS to second group.Period – It belongs to 4th period.Valency – Valency of calcium is +2 |
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| 46440. |
Explain fitting reaction with an example |
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Answer» The Wurtz–Fittig reaction is the CHEMICAL reaction of aryl halides with alkyl halides and SODIUM metal in the presence of DRY ether to give substituted AROMATIC compounds. ... The reaction works best for forming asymmetrical products if the halide reactants are somehow separate in their relative chemical reactivities.May it helps youPlease mark me as Brainliest☺☺☺ |
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| 46441. |
Calculate amount in gram of NaOH required to neutralise a acid mixture of 0.1M, 100 ml of H2SO4 and 0.2M, 400 ml of HCI. |
| Answer» FULLY EXPLAINED | |
| 46442. |
Calculate molarity of 49% w/w H2SO4(aq.) if density of solution is 1.8 g/ml. |
| Answer» MOLARITY of H2 SO4 (DENSITY... chemistry ... i.E., 18mol es of sulphuric acid is present per litre of SOLUTION. ... molality = massofsolvent(inkg)numberofmolesofsolut e ... How satisfied are you with the ANSWER? This will ... | |
| 46443. |
The [H+]of a solution is 10-8.its poh is |
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Answer» okkkkkk i will TRY okkkkkkkkkExplanation:okkkkkkkkkkkkk |
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| 46444. |
Fill in the blanks and complete the statements: The amount of__water vapour to form water droplets.` |
| Answer» GASEOUS PHASE EXPLANATION:gaseous phase | |
| 46445. |
20 3.बिहार में कितने प्रतिशत भौगोलिक क्षेत्र में वन का फैलाव है?(क)15202074.(ग)पूर्वोत्तर राज्यों के 188 आदिवासी जिलों में देश के कुल क्षेत्र का कितना प्रतिहै?(क)7580.05(ग) 90.03(घ) 60.11किस राज्य में वन का सबसे अधिक विस्तार है?5.6.(क) केरल(ख) कर्नाटकमध्य प्रदेशउत्तर प्रदेशवन संरक्षण एवं प्रबंधन की दृष्टि से वनों को वर्गीकृत किया गया है-(क) 4 वर्गों में3 वर्गों में |
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Answer» 20.3.74.60.115.madhya Pradesh6.3 |
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| 46446. |
50 g of calcium carbonate sample decomposes on heating to give calcium oxide and 20 g of carbon dioxide. The approximate purity of calcium carbonate sample is 95%78%91%82% |
| Answer» 95 PLEASE MARK me BRAINLIEST and FOLLOW me y | |
| 46447. |
248 gm mixture containing Li2CO3 & CaCO3 on strong heating produces CO2(g), which exerts 3 atm pressure in a container of volume 24 L at temperature 27° C. The simplest mole ratio of Li2CO3 and CaCo3 in the mixture is x: 1. The value of x'is: [Given that R=0.08L-atm/k-mole] [Atomic weight of Li = 7, Ca = 40] |
| Answer» CACO 3 (s)⇌CaO(s)+CO 2 (G)K p =p CO 2 =3.9×10 −2 atmLet the NUMBER of moles of CO 2 formed =nn= RTp CO 2 ×V = 0.082Latm/mol/K×1000K3.9×10 −2 atm×0.654L =3.11×10 −4 molThe amount of CaO(s) formed will also be 3.11×10 −4 molThe molecular WEIGHT of CaO=56g/molHence, the mass of CaO formed =3.11×10 −4 mol×56g/mol=0.0174g | |
| 46448. |
Why are cation smaller and anions larger in size than their respective neutral atoms |
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Answer» PLEASE FOLLOW ME AND MARK MY ANSWER AS THE BRANLIEST EXPLANATION:The ionic radius of a CATION is always smaller than the parent atom because the loss of ONE or more electrons increases the effective NUCLEAR charge. ... In contarst, the ionic radius of an anion is always larger than its parent atom because the addition of one or more electrons decreases the effective nuclear charge. |
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| 46449. |
Solutions A,B,C, D have H+ concentration 10 -2 , 10 -5 , 10 -9 and 10 -3 . i) Which is the most acidic? ii) Which is the weak acid? iii) Arrange them in increasing order of acidic strength. |
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Answer» fgshhdjsjskkdjdjdknsnsjsjejjsisjhbdd |
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| 46450. |
Fill in the blanks and complete the statements: For a given___and___of air there is a limit to how much amount of___the air can hold. At this temperature we say air is___ with water vapour. The amount of__water vapourto form water droplets.` |
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Answer» answers are in order:-MASS,volume,moisture,FILLED,airExplanation:PLEASE MARK as brainlist |
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