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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.
| 3401. |
4. A zinc plate was kept in a glass container having copper sulphate solution. On examining it wasfound that the blue colour of the solution is getting fader and fader. After a few days when the zineplate was taken out of the solution, a number of small holes were noticed in it. State the reason andgive chemical equation of the reaction involved. |
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Answer» ____________________________________________ ᑫᑌᗴՏTIOᑎ :::: State the reason and give the chemical equation of the reaction involved. having TROUBLE with your ANSWER? here it is...!! ____________________________________________ Zinc is more reactive than copper. Hence, when a zinc plate is kept in a solution of copper sulphate, it slowly displaces copper from the solution and blue colour of the solution keeps FADING away. Because of zinc going into solution as zinc sulphate a number of holes are seen in the zinc plate. Reaction : CuSO4(aq) + Zn(s) -------------) ZNSO4(aq) + CU(s) ____________________________________________ #answer_with_quality ✔ |
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| 3402. |
What is the pH of water? |
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Answer» Answer: HEYA...... ph of WATER is 7.1. .... hope it helps uh... ✌️✌️✌️ |
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| 3403. |
BALANCING OF REDOXING OF REDOX REACTIONSedcedlance the following given half reaction for theunbalanced whole reaction :Cro, → Cro, + OH-is :(1) Cro, + 2H,0 + 3e + CrO;+ 40H105(2) 2Croz? + 8H,0 → CrO; + 4H,0 + 8OH(3) Cro, 2 + H,0 → CrO; +H,0 + OH(4) 3Cr0,2 + 4H,0 + 6€ +20r0,+ 80H |
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Answer» the answer is २ Explanation: because the |
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| 3404. |
A solution of CuSO4 was kept in an iron pot. After a few days, the iron pot was found to have a largenumber of holes in it. Write the equation for this reaction that took place. Explain the reaction interms of reactivity of the metals.[NCERT Exemplar] |
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Answer» Explanation: |
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| 3405. |
sodium trioxocarbonate (IV) is obtained in both anhydrous and crystalline states by the solvay process. Give the chemical reactions involved in the process? |
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Answer» Answer: Sodium carbonate, Na2CO3, (also known as washing soda, soda ash and soda crystals) is the inorganic compound with the formula Na2CO3 and its VARIOUS hydrates. All forms are white, water-soluble salts. All forms have a strongly alkaline taste and give moderately alkaline SOLUTIONS in water. Historically it was extracted from the ASHES of plants growing in sodium-rich soils. Because the ashes of these sodium-rich plants were noticeably DIFFERENT from ashes of wood (once USED to produce potash), sodium carbonate became known as "soda ash".[12] It is produced in large quantities from sodium chloride and limestone by the Solvay process. Explanation: Please mark me as Brainliest . |
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| 3407. |
Q. 23. In the formation of the compound XY, atoms of X lost one electron each while atoms of Y gainedone electron each. What is the nature of bond in XY? Predict the two properties of XY. |
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Answer» ____________________________________________ ᑫᑌᗴՏTIOᑎ :::: What is the nature of bond in XY?Predict the two properties of XY. having trouble with your answer? here it is....!! ____________________________________________ The atoms of X lose electrons whereas the atoms of Y GAIN electrons. Thus, there is transfer of electrons from atoms of X to atoms of Y. The bond formed by the transfer of electrons is CALLED IONIC bond. Therefore, the nature of bond in the XY is ionic. Properties of ionic COMPOUND XY : (i) The compound will be soluble in WATER (ii) The compound will conducts electricity when dissolved in water or in molten state ____________________________________________ #answer_with_quality ✔ |
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| 3408. |
The number of covalent bonds present in propanone |
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Answer» Answer: the number of COVALENT bond present in PROPANONE is 9 Sigma and 1 PI bond.May it will help you.... |
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| 3409. |
How to do map marking very easily |
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Answer» Just FOCUS and LEARN and then EVERYTHING will be EASY... |
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| 3410. |
Why do metals not evolve hydrogen gas with nitric acid? |
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Answer» Answer: Hope it HELPS you Explanation: Hydrogen gas is not EVOLVED when a metal reacts with nitric ACID. It is because HNO3 is a strong oxidising agent. It oxidises the H2 produced to water and itself gets reduced to any of the nitrogen OXIDES (N2O, NO, NO2). |
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| 3411. |
For n = 2 and l = 0, give the sublevel designation, the allowable ml values, and the number of orbitals. |
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Answer» the sublevel designation will be 2s the allowable m VALVE will be 0 and value of s will be +-1by2 the no. of ORBITAL will be 1 .. |
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| 3412. |
(2) which one of the reachon isfellible give schhort to youranswera) 2NaCl+f2_____ 2Naf+cl2 |
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Answer» 2NaCl+f2 is the answer |
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| 3413. |
Predict the Products in the following reactions.CHYOHK2Cr2O7K2Cr2Odil. H2SO4 Conc. H2SO4(i) |
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| 3414. |
CH,OHK2Cr2O2?K,Cr,Conc. H2SO4dil. H2SO4 ? |
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Answer» Answer: CONVERTING etanol to ethanoic acid Explanation: k2cr POTASSIUM dichromate OXIDISES ethanol to FORM ethanoic acid |
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| 3415. |
Balance the equation with the correct coefficients.C2H2 + O2 --CO2+ H2O |
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Answer» Answer: In order to BALANCE C2H2 + O2 = CO2 + H2O you'll need to watch out for two things. FIRST, be sure to count all of C, H, and O atoms on each SIDE of the CHEMICAL equation. Explanation: |
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| 3416. |
How many moles are in 4.65 x 10^24 molecules of NO2 |
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Answer» No. of MOLES = No of MOLECULES / NA (AVOGADRO no.) Avogadro no. = 6.023×10^23 |
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| 3417. |
Which periods are older than the Triassic period? Select 3 options.CambrianCretaceousJurassicPermianSilurian |
Answer» CambrianPermianSilurianExplanation: HOPE it's helpfulfollow MAH ❣️❣️ |
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| 3418. |
Phenol on treatment with diethyl sulphate in presence of n a o h gives |
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| 3419. |
IUPAC name ans a.s.a.p |
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Answer» IUPAC NAME is CORONAVIRUS |
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| 3420. |
IUPAC naming of d photograph.. need ans a.s.a.p |
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Answer» Answer: 2,4 dimethylephenol |
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| 3421. |
Un balanced equation of carbon dioxide calcium hydroxide calcium carbonate water |
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Answer» Answer: The question given to us is CALCIUM hydroxide + Carbon dioxide → Calcium carbonate + WATER. The BALANCED chemical REACTION is Ca(OH)2 + CO2 --> CaCO3 + H2O. |
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| 3422. |
what is the pH of metal oxides and hydroxides and non metal oxides and what are the exceptions??????????????? |
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Answer» Answer: METAL hydroxide are basic in NATURE while non metal hydroxide are acidic in nature. EXCEPT = Al , pb, Zn |
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| 3423. |
Made by me xd what is importance of coal? |
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Answer» Answer: WOW!!! Tum to artist nikli....Importance of coal.....#Coal is USED as a fuel to generate electric power.#Coal can be BURNED to provide heat in individual home.#It is used in STEEL production.#Cement manufacturing#TransportationExplanation: FOLLOW MAH ❣️❣️ |
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| 3424. |
Sodium carbonate and sodium hydrogen carbonate are given to you in powder form. both are white in color. how do you identify them by a chemical test? |
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Answer» Answer: Explanation: Compare the color of the pH paper with the pH scale TYPICALLY PRINTED on the pH paper pack and assign pH of the SOLUTION ACCORDINGLY. If pH is around 8, the sample is sodium bicarbonate . If pH is in the range 9.5 to 10, it is sodium carbonate . |
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| 3425. |
The solubility of AgCl(s) with solubility product1.6 x 10-10 in 0.1 M NaCl solution would be |
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Answer» डॉग हॉस्पिटल इन द वर्ल्ड इन प्रोडक्ट लिस्ट B |
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| 3426. |
Arrange acc to acidic character --- phenol, o-clorophenol, Benzoic acid, 4methyl benzoic acid |
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Answer» this is the right answer . Explanation: it is because option 4 has more H+ Iona to LOSE.. |
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| 3427. |
How many moles is 2.17 X 10^23 representative particles of bromine? |
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Answer» Answer: 0.36 MOLES Explanation: Number of moles = 2.17 X 10^23 / 6.02 x 10^23 = 0.36 Hope it helps |
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| 3428. |
What is the total number of liters of O (g) at STP needed to produce 6.0 ×10 molecules of H O(l)?Given the reaction: 2H2 (g) + O2 (g) 2H2 O(l) |
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Answer» no IDEA sorry check out once in GOOGLE |
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| 3429. |
Most stable carbonation is in the following? |
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Answer» Explanation: The most STABLE form of carbon is GRAPHITE. These CAUSE greater attraction between carbon atoms hence giving stronger BONDS, more stability to the structure. Thanks for readingMark me brilliant |
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| 3430. |
Cooking makes food easy to digest |
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Answer» The process of COOKING food breaks down some of its fibers and plant cell walls, making it easier for the body to digest and ABSORB the nutrients ( 17 ). Cooking also generally improves the taste and aroma of food, which makes it much more ENJOYABLE to EAT |
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| 3431. |
What kind of deciplet here |
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Answer» SORRY I can't understand your question Explanation: can u edit the question |
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| 3432. |
Decreasing order of their atomic size na,rb,cs,li,k |
| Answer» CS>rb>K>na>li (atomic RADIUS INCREASES down the group) | |
| 3433. |
7. A compound is treated with NaNH, to givesodium salt. Identify the compound(a) C2H2(b) C2H6(c) C6H6(d) C2H4 |
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| 3434. |
Which polyroid is useed to kill insects in store grain |
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Answer» Answer: Equipment: Grain handling equipment should be kept clean. The effort involved in thorough preparation of storage bins is of little value if they are filled using contaminated equipment. Combines, trucks, augers and grain driers should be thoroughly cleaned of all old grain. The EMPTY Bin: Never put newly harvested grain into bins containing old grain. Empty the bins of all residual grain, then use SHOVELS, brooms and industrial vacuums to complete the job. Be especially careful to clear dust, webbing and fines from around any cracks and crevices, doors, seams, vents and especially under false floors. Even small amounts of old grain left in the bins may HARBOR enough insects to start a problem. Once the bins are clean, inspect them and repair any cracks or holes which would allow moisture or insects to enter. Then, spray the inside completely with an insecticide. (See Insecticides and Fumigants) Near the Bin: The area immediately surrounding the bins should be kept clean. Be sure to remove and destroy all spilled grain. Control weeds and grasses, since they can harbor insect and rodent pests. Inspect OUTSIDE walls and especially the base and roof for damage that could allow pests and moisture to enter. Do not use the area immediately surrounding the grain bins to store cattle feed; keep stock feeders as far away as possible. The Grain: Store only clean, dry grain. A small percentage difference in moisture content can make a big difference in the probability of a damaging insect infestation. The optimum moisture content for stored grain is 12-13%. Most grain INHABITING insects require 13-15% moisture for maximum feeding and reproduction. It is also advisable to clean grain before binning. Small pieces of dockage and cracked or split grain provide food for insects not normally found in whole grain. Even though most of these insects will not feed on whole grain, their biological processes produce heat and moisture which can greatly reduce the stored grain's quality. Level the grain surface once the bin has been filled. This will allow for good air flow and thus improved moisture and temperature control. It also will allow improved access for inspection and treatment. Explanation: |
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| 3435. |
Please explane easy language |
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Answer» easy language |
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| 3436. |
Chloro ethane to acetic acid |
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Answer» Answer: ETHANE can be converted to ETHANOIC acid or ACETIC acid by CATALYTIC oxidation. There are a number of ways, depending upon the catalyst, to achieve this conversion. The commonly used catalysts for this conversion INCLUDE, protonated pentasil-type zeolite (or, H-ZSM-5), Fe/ZSM-5, , etc. Explanation: |
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| 3437. |
Explain the following,(í) Combustion (íí) Addition reaction (ííí) Substitution reaction (ív) Oxidationaccording to Carbon And It's Compounds |
Answer» Burning of substance in the presence of air is called combustionHope it helps u♥♥ |
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| 3438. |
Would you expect the reaction of propyl bromide with NaCN , which is :-CH3CH2CH2-Br + NaCN -----> CH3CH2CH2-CN + NaBr to occur faster in DMF or in ethanol ?explain |
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Answer» The REACTION will occur faster in DMF.
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| 3439. |
With respect to an ore, Ellingham diagram helps to predict the feasibility of its(A) Electrolysis (B) Thermal reduction (C) Vapour phase refining (D) Zone refining |
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Answer» Answer: |
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| 3440. |
In order to oxidize a mixture of one mole of each of FeC₂O₄ , Fe₂(C₂O₄)₃ , FeSO₄ and Fe₂(SO₄)₃ in acidic medium, the number of moles of KMnO₄ required is:(A) 1 (B) 1.5(C) 2 (D) 3 |
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Answer» D. will be correct answers Explanation: Mn+7 reduce to Mn+2 in acidic medium so totall 5 ELECTRONS can transfer by 1 mole. for total 16 + ions 5 kmno4 will be required. HOPE the answer will help you Mark |
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| 3441. |
Maltose on treatment with dilute HCI gives:(A) D – Fructose (B) D – Galactose (C) D – Glucose and D – Fructose (D) D – Glucose |
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Answer» HYDROLYSIS of MALTOSE with DILUTE HCL GIVES only (D) D-Glicose |
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| 3442. |
Which of the following amines can be prepared by Gabriel phthalimide reaction?(A) t – butylamine (B) n – butylamine (C) neo – pentylamine (D) triethylamine |
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| 3443. |
The IUPAC name of the following compound is(A) 3-Hydroxy – 4 – methylpentaonic acid (B) 4 – Methyl – 3 – hydroxypentanoic acid (C) 2 – Methyl – 3 – hydroxylpentan-5-oic acid(D) 4, 4 – Dimethyl – 3 – hydroxybutanoic acid |
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Answer» OPTION B Explanation: hghhbzeyjcssrhv |
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| 3444. |
Given that ᴱ⁰O₂/H₂O = +1.23V; ᴱ⁰S₂O₈²⁻/SO₄²⁻ = 2.05 V; ᴱ⁰Br₂/Br⁻ = +1.09 V; ᴱ⁰Au³⁺/Au = 1.4V. The strongest oxidizing agent is:(A) O₂(B) S₂O₈²⁻(C) Au³⁺(D) Br₂ |
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| 3445. |
If solubility product of Zr₃ (PO₄)₄ is denoted by Kₛₚ and its molar solubility is denoted by S, then which of the following relation between S and Kₛₚ is correct?(A)S = (Kₛₚ/6912)¹/⁷(B)S = (Kₛₚ/144)¹/⁶(C)S = (Kₛₚ/929)¹/⁹(D)S = (Kₛₚ/216)¹/⁷ |
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Answer» Answer: A. will be correct ANSWERS |
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| 3446. |
The vapour pressures of pure liquids A and B are 400 and 600 mm Hg, respectively at 298 K. On mixing the two liquids, the sum of their initial volumes is equal to the volume of the final mixture. The mole fraction of liquid B is 0.5 in the mixture. The vapour pressure of the final solution, the mole fractions of components A and B in vapour phase, respectively are:(A) 500 mmHg, 0.4, 0.6 (B) 500 mmHg, 0.5, 0.5(C) 450 mmHg, 0.5, 0.5 (D) 450 mmHg, 0.4, 0.6 |
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Answer» A. will be correct answers Mark the answer BRAINLIESTS PLEASE |
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| 3447. |
Which of this can be used to remove carbon (IV) in air Alkaline pyrogallol Anhydrous calcium chloride Sodium hydroxide Yellow phosphorus |
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Answer» ans is ALKALINE PYROGALLOL ANHYDROUS used to REMOVE carbon in air |
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| 3448. |
Assertion : Ozone is destroyed by CFCs in the upper stratosphere.Reason : Ozone holes increase the amount of UV radiation reaching the earth. (A) Assertion and reason are incorrect (B) Assertion is false, but the reason is correct(C) Assertion and reasons are both correct, and the reason is the correct explanation for the assertion. (D) Assertion and reason are correct, but the reason is not the explanation for the assertion. |
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Answer» the answer is = (D)....... |
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| 3449. |
Which one of the following equations does not correctly represent the first law of thermodynamics for the given processes involving an ideal gas? (Assume non –expansion work is zero)(A) Adiabatic process: ∆U = –w (B) Isochoric process: ∆U = q(C) Cyclic process: q = –w (D) Isothermal process: q= –w |
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Answer» D. will be INCORRECT answer in isothermal PROCESS heat is ZERO and U = w |
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| 3450. |
The quantum number of four electrons are given below:I. n = 4, l = 2, mₗ = -2, mₛ = -1/ 2 II. n = 3, l = 2, mₗ = 1, mₛ = +1/ 2III. n = 4, l = 1, mₗ = 0, mₛ = +1/ 2IV. n = 3, l = 1, mₗ = 1, mₛ = -1/ 2The correct order of their increasing energies will be: (A) I < III < II < IV (B) I < II < III < IV(C) IV < II < III < I (D) IV < III < II < I |
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Answer» answer is option (B) |
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