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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.
| 2351. |
Explain the shape of NH3 molecule on the basis of hybridisation |
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Answer» Answer: in NH3 the central atom is sp3 hybridised. So the shape of ammonia should be tetrahedral. But due to the presence of only THREE hydrogen atoms and a LONE PAIR, it's shape is pyramidal. Explanation: HOPE the answer helps pls mark me as brainliest |
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| 2352. |
What do you mean by the quantisation of the angular moment |
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Answer» Answer: QUANTIZATION of angular MOMENTUM means that the radius of the ORBIT and the energy will be quantized as WELL. Bohr assumed that the discrete lines seen in the spectrum of the hydrogen atom were due to transitions of an ELECTRON from one allowed orbit/energy to another. |
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| 2353. |
Hey✌️Q. why direct heating of ink is avoided during separation of ink? |
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Answer» PLEASE MARK ME A BRAINLIEST ANSWER. |
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| 2355. |
Is soap solution a mixture? Justify |
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Answer» SOAP SOLUTION is a HETEROGENEOUS mixture while the rest are of homogeneous nature. I think the answer HELP u |
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| 2356. |
Please tell me the answer for these questions |
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Answer» Answer: Below is the answer of the questions you have asked |
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| 2357. |
Pressure cooker reduces cooking time for food because.a) boiling point of water involved in cooking is increased.b)heat is the more evenly distrusted in the cooking space.c) the higher pressure inside the cooker crushes the food material.d)cooking involves chemical changes helped by a rise in temperature. |
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Answer» Answer: A Explanation: Because under pressure, the heat builds faster and maintains temperature BETTER, so COOKING time is reduced. ... The increased pressure inside the COOKER increases the boiling POINT of water above 100°C so more cooking is done before the water ACTUALLY starts to boil. So ultimately food is cooked faster |
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| 2358. |
Hey✌️Q. by which method of separation the valoite component from its non-volatile solute can be separated?________ |
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Answer» Explanation: Evaporation is the process of vaporizing the solvent to obtain the solute. Evaporation is used to separate the mixture CONTAINING the non volatile soluble solid from its volatile liquid solvent. We can separate salt from a solution by evaporating the water from the solution. Hope it helps you.... PLEASE MARK it as the Brainliest... Please follow me... |
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| 2359. |
What will be the action of the following substances on litmus paper? Dry HCl gas, Moistened NH3 gas, Lemon juice, Carbonated soft drink, Curd, Soap solution. |
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Answer» Answer: Dry HCl gas No change on litmus paper (ii) Moistened NH3 gas (BASIC) RED litmus will turn BLUE. |
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| 2360. |
Ques. 2: write the balanced chemical equations for the following reactions and identify the type of reaction1 .Potassium bromide + Barium chloride --- → Potassium iodide + Barium chloride2 .Zinc carbonate ---→Zinc oxide + Carbon dioxide3 .Barium chloride + Sodium sulphate---→Barium sulphate + Sodium chloride4 .Hydrogen + Chlorine ---→ Hydrogen chloride5 .Zinc + Silver nitrate ---→ Zinc nitrate + Silver. plzz help me |
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Answer» Answer: 11th Chemistry Some Basic Concepts of Chemistry Stoichiometry and Stoichiometric Calculations Write the balanced chemical... CHEMISTRY Write the balanced chemical equation for the following and identify the type of reaction in each case: (a) Potassium bromide(aq) + Barium iodide(aq) → Potassium iodide(aq) + Barium bromide(s) (b) Zinc carbonate(s) → Zinc oxide(s) + Carbon dioxide(G) (c) Hydrogen(g) + Chlorine(g) → Hydrogen CHLORIDE(g) (d) Magnesium(s) + Hydrochloric acid(aq) → Magnesium chloride(aq) + Hydrogen(g) October 15, 2019 avatar Noor Savani Share Save VIDEO EXPLANATION ANSWER (a) Potassium bromide(aq) + Barium iodide(aq) → Potassium iodide(aq) + Barium bromide(s) 2KBr (aq)
+BaI 2
(aq)
→2KI (aq)
+BaBr 2
(s)
In this reaction, both the reactants exchanges ions to for two new products, hence, it is a double displacement reaction (b) zinc carbonate(s) → Zinc oxide(s) + Carbon dioxide(g) ZnCO 3
(s)
→ZnO (s)
+CO 2
(g)
In this reaction, a SINGLE substance yields two different product. hence, it is a decomposition reaction (c) Hydrogen(g) + Chlorine(g) → Hydrogen chloride(g) 2
(g)
+Cl 2
(g)
→2HCl (g)
In this reaction, two different reactants react with each other to form a single product. Hence, it is called a combination reaction (d) Magnesium(s) + Hydrochloric acid(aq) → Magnesium chloride(aq) + Hydrogen(g) Mg (s)
+2HCl (aq)
→MgCl 2
(aq)
+H 2
(g)
In this reaction, more reactive Mg is replacing less reactive H. Hence, it is displacement reaction |
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| 2361. |
How much energy is required by an electron while moving from ground state to 3rd excited state of H atom |
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Answer» Answer: ORIGINALLY Answered: How MUCH energy would be required by an electron while moving from ground state to 3 rd excited state of He atom? THIRD excited state means, n=4. Change= -3.4-(-54.4) EV= 51eV. |
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| 2362. |
Which of the following is smallest in size?a)Na+ b)N3- c) O2- d)k+ |
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Answer» Explanation: as size is decreased in group from top to BOTTEM |
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| 2363. |
Calculate Radius of first and third orbit of He+ ion. |
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Answer» Explanation:hi! Hope this helps you:) Bohr Radius = Z 0 n 2
where, R 0 =0.529 A ˚
+ -> n=1,z=2. R= 2 R 0
=0.2645 A ˚
∴ The radius of first orbit in He + ion is 0.2645 A ˚ |
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| 2364. |
Computer ka full form batao |
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Answer» COMMON oriented machine PARTICULARLY used for technicle and education RESEARCH please mark me as branlist |
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| 2365. |
Anomalous behaviour of oxygen???? |
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Answer» Anomalous behaviour of OXYGEN Oxygen forms strong HYDROGEN bonding in H2O which is not found in H2S. Also, the maximum covalency of oxygen is four, whereas in a CASE of other elements of the group, the valence shells can be expanded and covalency EXCEEDS four. |
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| 2366. |
Calculate the wavelength and frequency of photon of energy 16eV. |
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Answer» Answer: We KNOW that, E=h⋅v v= h E
(1eV=1.602×10 −12 erg) = 6.62×10 −27
3×(1.602×10 −12 )
=7.26×10 s −1
=7.26×10 14 Hz λ= v c
= 7.26×10 14
3×10 10
=4.132×10 −5 v ˉ = λ 1
= 4.132×10 −5
1
=2.42×10 4 cm −1 . |
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| 2367. |
Which of the following has the largest ionic radius?a)Be+ b)Mg+ c)ca2+ d)sr2+ |
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Answer» ANSWERE- d)Sr2 |
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| 2368. |
Fe(SCN)3 atomic mass as to confirm. please explain orderly |
Answer» atomic MASS =<>>>> (229.85gmol')your answer... |
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| 2369. |
Differentiate between position and chain isomerism with example |
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Answer» Answer: OKAY, well I am answering this because many people have answered to this query either in a wrong way or they are just partially right. As many said that it's a necessity to have functional group for POSITION isomers, well, they are wrong. I will be giving examples to state my point. CHAIN ISOMERS NON CYCLIC CHAINS Parent chain must be of different NUMBERS of carbon. For eg. Iso pentane and n pentane and neo pentane, all among themselves are chain isomers. Functional group if present must be same in both/all isomers. For eg. Pentane-2-ol and 2-methylbutan-1-ol. CYCLIC RINGS Parent carbon chain can be same, but then the side chain or BRANCH must form DIFFRENT types of radicals( should have diffrent word roots.). For eg. 1)Ethyl cyclohexane and 1,3 methyl cyclohexane and 2) Ethyl cyclohexane and 1,2- methyl cyclo (NOTE- 1,3-methylcyclohexane and 1,2- methyl cyclo hexane are positional isomers among themselves but are chain isomers when compared to Ethyl cyclohexane.) POSITION ISOMERS CYCLIC/ non CYCLIC Parent carbon chain has to be same and it's a mandate. Only the position of functional group or side branch must be different. Eg 2-methylpentane and 3-methylpentane. I hope it helps. |
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| 2370. |
What is the use of photochemical reaction in metal industry |
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Answer» Answer: Photosynthesis: plants use solar energy to CONVERT carbon dioxide and water into glucose and OXYGEN. Human formation of vitamin D by exposure to sunlight. Bioluminescence: e.g. In FIREFLIES, an enzyme in the abdomen catalyzes a reaction that PRODUCED light. |
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| 2371. |
Whichscale of measuingthetemperature is thebest?. |
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Answer» celcius or in the eyes of scientists KELVIN SCALES are best Explanation: please MARK me the brainliest answer I would love if you liked my answer |
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| 2372. |
How many grams of ethyl alcohol (C2H5OH, MW 46,1) are present in 500mL of a solution 0,2M? PLEASE HELP ME |
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Answer» Answer :- molar mass of ethyl ALCOHOL = 46.0g/MOLE volume of solution = 500 ml = 0.5l MOLARITY = mole /volume of solution mole of ethyl alcohol = 50/46 molarity = (50/46)/ 0.5= 2.1739 ....ANS.... |
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| 2373. |
The enthalpy change for the transition of ice to liquid water at 273 K is6.02 kJ mol-?. Calculate the entropy change for the process. |
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Answer» REFER this........... |
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| 2374. |
Is hydrogen in palladium heterogeneous or homogeneous mixture? |
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Answer» HOMOGENEOUS MIXTURE .......... |
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| 2375. |
help guys Solve: 1. A solution contains 30g of common salt in 240g of water. Calculate the concentration in terms of mass by mass percentage of the solution. 2.Calulate the mass of the sodium sulphate required to prepare its 30% (mass percent)solution in 200 grams of water. 3.Teacher asked students to prepare a 20% solution (Mass/Mass) of sugar in water. Ramesh dissoved 20g of sugar in 100g of water while Sara prepared it by dissolving 20g of sugar in water to make 100g of the solution. a)Are two solutions of the same concentration? b)Compare the mass % of the two solutions. |
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Answer» Answer: This is your answer... Explanation: 1. CONCENTRATION of solution = mass of solute / mass of solution Mass of common salt is 30g . Mass of water is 240g . Mass of solution = 30 + 240 = 270G Concentration of solution = (30 / 300) * 100 Concentration = 30% 2. Mass of the solution = mass of solute + mass of solvent Given that the mass percent of sodium sulphate solution is 30%. Let the mass of sodium sulphate which is required to prepare this solution be x grams. Given that the mass of water is 200 g. So, 30 = [x/(x + 100)] * 100 30/100 = [x/(x + 100)] 3/10 = [x/(x + 100)] x = (3/10) x (x+100) x = (3x + 300) / 10 3x + 300 = 10x 10x - 3x = 300 7x = 300 x = 42.8 Thus, 42.8 g of sodium sulphate is required. 3. a) No, both are different. b) According to the solution prepared by Ramesh, Mass of sugar he TOOK (Solute) = 20 g Mass of water he took (Solvent) = 100 g Thus Mass % of the solution = mass of solute / mass of solution = (20 / 120) * 100 = 50 / 3 = 16.66 % According to the solution prepared by Sara, Mass of sugar she took (Solute) = 20 g Mass of Solution she took = 100 g Thus Mass % of the solution = mass of solute / mass of solution = (20 / 100) * 100 = 20 % PLEASE MARK AS BRAINLIEST IF IT REALLY HELPS YOU...❣❣❣ |
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| 2376. |
Define the Stiochometry reaction what is it use |
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Answer» Explanation: Definition:STOICHIOMETRY is the part of CHEMISTRY that studies amounts of SUBSTANCES that are involved in reactions. You MIGHT be looking at the amounts of substances before the reaction. You might be looking at the amount of material that is produced by the reaction USE :Stoichiometry is the calculation of reactants and PRODUCTS in chemical reactions. ... Describing the quantitative relationships among substances as they participate in chemical reactions is known as reaction stoichiometry. Hope it will help... Pls Pls mark me Brainlist Thanks.. |
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| 2377. |
What is wave number ? How is it related to wave length ? |
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Answer» Answer: The WAVE number for an EM field is equal to 2 PI divided by the WAVELENGTH in meters. (In some references, it is defined as the reciprocal of the wavelength in meters; in still others, it is defined as the reciprocal of the wavelength in CENTIMETERS.) As the wavelength grows shorter, the wave number becomes larger. |
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| 2378. |
When Iron powder and Sulphur powder were mixed together and heated strongly, a substance A was formed. When dil. Hydrochloric acid was added to substance A, the gas B was evolved. a) What is A and what type of substance is it? b) Name the gas B. State one characteristic property of gas B. c) Is the reaction of Iron and Sulphur powder a chemical change or a physical change? Give reasons to support your answer. |
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Answer» Answer: a) Iron/ferrous sulphide b) Hydrogen gas, at standard temperature and pressure, hydrogen is a nontoxic, nonmetallic, odorless, tasteless, colorless, and highly COMBUSTIBLE diatomic gas with the MOLECULAR formula H2. c) It is a chemical change, because when iron and SULPHUR POWDER MIXED it forms a totally different substance which is iron sulphate, which has different chemical property from that of iron and sulphur powder. |
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| 2379. |
The pH of soil p is 7.3 and that of soil Q is 4 which of to soil p and Q you should be treated with line to adjust PH andwhy |
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Answer» Explanation: |
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| 2380. |
the pH of soil p is 7.3 and that of soil cue sports which of to soil p ok you should be treated with lime to adjust PH and why? this is the wronge question se another one |
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Answer» can't SORRY brooooooooo |
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| 2381. |
3. The boiling point and condensation point ofa substance are the same. What determineswhether it will boil or condense at thattemperature? |
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Answer» Answer: If a gas is COOLED, its particles will eventually stop MOVING about fast and form a liquid. This is CALLED condensation and occurs at the same temperature as boiling. The boiling point and condensation point of a substance is the same temperature. mark me as brainliest |
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| 2382. |
Er solution.) सम आयन प्रभाव क्या है? |
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Answer» SOLUTION : सम-आयन युक्त प्रबल विघुत- अपघट्य की उपस्थित में दुर्बल विघुत- अपघट्य की वियोजन की मात्रा घाट जाती है। यह प्रभाव सम आयन प्रभाव कहलाता है। |
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| 2383. |
Please help I have a test tomorrow!!How many grams of ethyl alcohol (C2H5OH, MW 46,1) are present in 500mL of a solution 0,2M? |
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Answer» Answer: |
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| 2384. |
1Calculate the molar mass of the following: (1) H20 (ii) CO2 (iii) CH4 |
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Answer» molar mass of H2O is 18g/mol . 2*1+16. 2.CO2. has molar mass is 12+16*2=44gm/mol. 3. CH4 has molar mass, 12+1*4=16gm/mol. Explanation: Here is answer, HOPE it helps you.If it REALLY helps you, should you follow me. could you please mark this brilliant. |
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| 2385. |
एंथैल्पी परिवर्तन एक अवस्था फलन है |
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Answer» yesss That's WRITE |
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| 2386. |
Give the name and formula of one ore of the following metals(a) Iron(b) Copper(c) Zinc |
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Answer» REFER this......... .... |
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| 2387. |
A solid compound contains X,Y and Z atoms in a cubic lattice with X atoms occupying the corners Y atoms in the body centered positions and Z atoms at the centres of all the faces of the unit cell. What is the formula of the compound? |
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Answer» Answer: A SOLID compound contains X,Y and Z atoms in a cubic lattice. in the body centred POSITIONS and Z atoms at the centres of FACES . May this ANSWER will help you plz mark has brainliest |
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| 2388. |
Explain polysaccharide in detail |
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Answer» Answer: Polysaccharides are long chains of monosaccharides LINKED by glycosidic bonds. Three IMPORTANT polysaccharides, starch, glycogen, and cellulose, are COMPOSED of glucose. Starch and glycogen SERVE as short-term energy stores in plants and animals, respectively. The glucose monomers are linked by α glycosidic bonds.. Explanation: please MARK me as a BRAINLIST.. |
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| 2389. |
The liquids which vaporize faster |
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Answer» Answer: It was CONCLUDED that different liquids do evaporate at different rates, ACCORDING to the physical properties of the given substance. Nail polish remover vaporized the QUICKEST, FOLLOWED by water, SALT water, vinegar, orange juice and oil. |
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| 2390. |
If in a water solution the concentration of H3O+ ions is 0,001M, what is the pH? |
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Answer» Heyy Buddy This is the answer-- [H3O+]=[HCl]=0.001 M. This MEANS that the PH of the SOLUTION will be.pH=−log(0.001). pH=3. Hope it helps you... Thanks |
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| 2391. |
What is the copper wire |
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Answer» A WIRE MADE OF COPPER METAL IS CALLED COPPER WIRE. PLEASE MARK AS BRAINLIEST. :-) |
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| 2392. |
एंथैल्पी परिवर्तन एक अवस्था फलन हैtrue or false |
Answer» true is your answer.... |
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| 2393. |
Orbital angular momentum depends on |
| Answer» | |
| 2394. |
concentration of any solution refers to: a) no. of solute particles in the solution b) mass of solute particles in the solution c) mass of solvent particles in the solution pls give the answer |
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Answer» Answer: |
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| 2395. |
What is molality in chemistry?Plz explain it if you know. Dont copy paste from internet.Dont spam or i will report..... |
| Answer» | |
| 2396. |
मोरलता एक किलोग्राम विलायक में घुले विलेय के मोलों की संख्या होती है |
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| 2397. |
How many grams of ethyl alcohol (C2H5OH, MW 46,1) are present in 500mL of a solution 0,2M? |
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Answer» Answer: |
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| 2398. |
(iv) Meta-directing group is -(a)-NH(b)-CI(c)-NO2(d) -OH |
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Answer» OPTION C is ABSOLUTELY RIGHT |
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| 2399. |
Support with exemple that compound formation takes place with energy changes using water formation and iron sulphide formation |
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Answer» Answer: Solution: The chemical reaction for water formation to show energy EXCHANGE we use the formula: The burning of methane GAS in plain air or in presence of oxygen we get: As methane burns in air it FORMS carbon dioxide and water The chemical reaction for SULPHIDE formation to show energy exchange we use the formula: Sulphide is usually attached with sodium or Hydrogen the formation or the chemical reaction for the sulphide is The formation of sodium sulphide is formed by sodium hydrosulphur and sodium hydroxide. Boiling off the sodium sulphide we get the conjugate sulphide. Read more on Brainly.in - brainly.in/question/11833981#readmore |
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| 2400. |
Alkyl halides are almost insoluble in water because -a) They are covalent compoundsb) They havelow polarityc) They do not formhydrogenbond with waterd) They havetetrahedral geometry |
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Answer» Answer: The alkyl HALIDES are insoluble in water because there is very little attraction that the HALIDE molecules have for the solvent water. Hydrogen BONDING is not present and for that reason, most alkyl halides are insoluble in water but TEND to be soluble in hydrocarbon solvents Explanation: HOPE it helps |
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