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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.
| 2452. |
Choose the correct option 3. In the following question, a statement of assertion (A) is followed by a statement of reason (R). Assertion (A) -when zinc is added to dilute hydrochloric acid,hydrogen is given off Reason (R)-hydrogen chloride molecules contain hydrochloric acid and hydrogen atoms (a) Both A and R are true and R is correct explanation of the assertion. (b) Both A and R are true but R is not the correct explanation of the assertion. (c) A is true but R is false. (d) A is false but R is true. |
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Answer» Answer: (C) A is true but R is false Hope it's HELPFUL for you....✌️✌️ Click THANKS button... MARK me as brainlist.... |
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| 2453. |
guys plzzz help fast i really need answer for these questions Answer the following questions in brief: 1.List the two conditions essential for using distillation as a method for separation of the components from a mixture. 2.Which method is used to separate two immiscible liquids? 3.Name two elements which are in liquid state at room temperature? 4.What is meant by solubility? 5.Write 2 examples of chemical change you observed around you. |
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Answer» Explanation: 1. a)The components should boil without decomposition b)The components should have SUFFICIENT DIFFERENCE in their boiling points 2.A separating funnel is used to separate two IMMISCIBLE liquids 3.Mercury and Bromine are liquid at room temperature 4.The amount of the solute present in the saturated solution at a particular temperature is called its solubility 5.Burning of WOOD and RESPIRATION is a chemical change |
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| 2455. |
What is role of H2O in the reaction of |
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Answer» Answer: I GUESS it is to DILUTE the CONCENTRATED SOLUTE or solution. |
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| 2456. |
(PART-C)पाउली के अपवर्जन का निyam क्या है |
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Answer» Step-by-step explanation: hey don't PLEASE report me just wanted to SAY : ╔┓┏╦━━╦┓╔┓╔━━╗ ║┗┛║┗━╣┃║┃║ o o ║ ║┏┓║┏━╣┗╣┗╣╰╯║ ╚┛┗╩━━╩━╩━╩ |
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| 2457. |
Why gas exerts more presure than solid |
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Answer» Answer: Plz,if it is correct plz rate ⭐me,like me and follow me and MARK me as brainlist Explanation: GASES exert more pressure on the walls of the container than solids do because there is more kinetic ENERGY(thermal energy) in the gases which make it's particle to move with GREAT speed.So, they exert more pressure than solids. |
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| 2458. |
How is the production proccess of plastics harmful to the environment |
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Answer» Explanation: PRODUCTION of plastic is harmful to the environment because it CONTAINS many MICROORGANISMS that are harmful to us and they spread many diseases. These microorganisms does not help plastic to decompose in the soil. So, this is the REASON that PROCESS of production of plastic is harmful to the environment |
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| 2459. |
(i)साधारणतया हैलोजनों का सामान्य इलेक्ट्रॉनिक विन्यास......... होता है। |
Answer» साधारणतया हैलोजनों का सामान्य इलेक्ट्रॉनिक विन्यास NS2, np5 होता है।- हैलोजन ग्रुप तत्वों की आवर्त सारणी के वर्ग 17 में पायी जाती हैं। - इस वर्ग का सामान्य इलेक्ट्रॉनिक विन्यास ns2, np5 होता है। - हैलोजनों के परमाणुओं की सबसे बाहरी कक्षा में इलेक्ट्रानों की संख्या (अर्थात 'संयोजक इलेक्ट्रानों' की संख्या) 7 होती है। - इनमे बाहरी SUBSHELLS को पूर्ण करने में एक इलेक्ट्रॉन की कमी होती है, जो उन्हें बहुत प्रतिक्रियाशील बनाता है। - इसलिए ये प्रतिक्रियाशील क्षार धातुओं के साथ विशेष रूप से जोरदार प्रतिक्रियाओं से गुजरते हैं। |
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| 2460. |
प्रश्न-13 273 K पर बर्फ के द्रव जल में संक्रमण के लिए एंथैल्पी परिवर्तन 6.02 kJmol' है। इस प्रक्रम के लिएएंट्रापी परिवर्तन परिकलित कीजिए।[3]The enthalpy change for the transition of ice to liquid water at 273 Kis6.02 kJ mol''. Calculate the entropy change for the process. |
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Answer» GIVEN : Enthalpy change for the TRANSITION of ice to liquid water = 6.02 KJ / mol Temperature = 273 K To find : The ENTROPY change for the process . Solution : Entropy change , ΔS = ( change in enthalpy ) / ( temperature ) => ΔS = ΔQ / T => ΔS = 6020 / 273 => ΔS = 22.05 J / K per mole The entropy change for the process is 22.05 J / K .
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| 2461. |
3. Which gas is hydrolysed in the lungsto form HC1 and ultimately lead tosuffocation?(1) NH3(2) C12(3) SO2(4) COC12 |
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| 2462. |
Law of conservation of mass to law of definite proportion write and send(this is a question of class 9) |
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Answer» Answer: This law states that if a COMPOUND is broken down into its constituent ELEMENTS, the masses of the constituents will always have the same proportions, regardless of the quantity or SOURCE of the original SUBSTANCE |
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| 2463. |
(8)प्रश्न-3 फ्लुओरीन की इलेक्ट्रॉन ग्रहण एन्थैल्पी क्लोरीन से कम क्यों होती है?Why does Fluorine have electron gain enthalpy lower than chlor |
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Answer» <STRONG>Explanation: In ENGLISH The negative electron GAIN enthalpy of FLUORINE is less than that of chlorine. It is DUE to small size of fluorine atom. As a result, there are strong interelectronic repulsions in the relatively small 2p orbitals of fluorine and thus, the incoming electron does not experience much attraction. In hindi फ्लोरीन का नकारात्मक इलेक्ट्रॉन लाभ क्लोरीन की तुलना में कम होता है। यह फ्लोरीन परमाणु के छोटे आकार के कारण है। नतीजतन, फ्लोरीन के अपेक्षाकृत छोटे 2p ऑर्बिटल्स में मजबूत इंटरलेक्टोनिक क्रॉनिकल्स होते हैं और इस प्रकार, आने वाले इलेक्ट्रॉन को अधिक आकर्षण का अनुभव नहीं होता है। Agar answer clear ho jae to then mark my answer as a brainlist |
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| 2464. |
Choose The Correct Option1. In the following question, a statement of assertion (A) is followed by a statement of reason (R). Assertion-Carbon Dioxide turns lime into waterReason-Carbon Dioxide Sullies The Water(a) Both A and R are true and R is correct explanation of the assertion.(b) Both A and R are true but R is not the correct explanation of the assertion.(c) A is true but R is false.(d) A is false but R is true. |
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| 2465. |
Pls do ans its very much urgent |
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Answer» Answer: HENCE, the number of photons with a wavelength of 4000 PM and ENERGY of 1 J are 2.012 * 10^16. Explanation: I hope this helps you friend mark as brainliest answer me please FRIENDS |
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| 2466. |
Explain the ways of expressing concentration. |
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Answer» CONCERTRATION is the ability of direct ONE attention in accordance with one will it MEANS CONTROL of the attention |
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| 2467. |
2. आबंध कोटि = b.o. = Ven-nLi, ; के लिए = [4-2] =% [2] = 1Be, : के लिए = [4-4] = [0] = 0 |
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Answer» Answer: विहगयाथार दापतीय संघर्ष के नेतृत्व के लिए नेहरू जी किस वर्षकी ओर देखोये और ग्यो विटिशकालीन मालSteps: 1) Draw a line segment AB of length 9.3 units. 2) Extend the line by 1 unit more such that BC=1 unit . 3) FIND the midpoint of AC. 4) Draw a line BD perpendicular to AB and let it intersect the SEMICIRCLE at point D. 5) Draw an arc DE such that BE=BD. Therefore, BE= 9.3
units |
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| 2468. |
Answer the following questions in brief: 1.List the two conditions essential for using distillation as a method for separation of the components from a mixture. 2.Which method is used to separate two immiscible liquids? 3.Name two elements which are in liquid state at room temperature? 4.What is meant by solubility? 5.Write 2 examples of chemical change you observed around you. |
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Answer» Answer: Explanation: 1.Two conditions essential for using DISTILLATION method are as follows. The two liquids should be miscible with each other. This MEANS that the two liquids should properly mix with each other. The difference in boiling point of the two liquids should be less than 25 degree celsius. 2.Separating IMMISCIBLE liquids is done simply using a separating funnel. The two liquids are put into the funnel and are left for a short time to settle out and form twolayers. The tap of the funnel is opened and the BOTTOM liquid is allowed to run. 3.At this temperature and ordinary pressure, only two elements are liquids: Bromine. Mercury. 4.the ability to be dissolved, ESPECIALLY in water 5.A chemical change results from a chemical reaction, while a physical change is when matter changes forms but not chemical identity. Examples of chemical changes are burning, cooking, rusting, and rotting. Examples of physical changes are boiling, melting, freezing, and shredding. |
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| 2471. |
A Salt has the followingComposition - Na= 29.11 90 S - 40.51%O = 30.38% Determine the formulaof the Salt |
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| 2472. |
What will happen if metal is reacted ewith acid |
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| 2473. |
What is the colour change in the Activity . Take a spoonful of lime stone powder in an evaporating dish heat it strongly on a high blue flame |
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Answer» When limestone is heated strongly, the calcium carbonate it CONTAINS ABSORBS heat (ENDOTHERMIC ) and DECOMPOSES to form calcium oxide. This is indicated by an orange glow as the limestone is heated. |
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| 2474. |
Classify the following as homogeneous and heterogeneousmixtures:a. Chalk and water |
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Answer» Answer: HETEROGENEOUS : MIXTURE of soil and CHALK, mixture of wheat flour with WATER |
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| 2475. |
In H atom lyman series occurs in the |
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Answer» In physics and chemistry, the LYMAN series is a hydrogen spectral series of TRANSITIONS and resulting ultraviolet emission LINES of the hydrogen atomas an electron goes from n ≥ 2 to n = 1 (where n is the principal QUANTUM number), the lowest energy LEVEL of the electron. |
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| 2476. |
(i)साधारणतया हैलोजनों का सामान्य इलेक्ट्रॉनिक विन्यासहोता है।The general electronic configuration for halogens isदूध, पानी में वसा का........है।Milkisan...,.....of fat in water.(iii) भारी पानी का उपयोग न्यूक्लियर रिएक्टरों में ............. के रूप में किया जाता है।(iii) Heavy water is used as ............... innuclear reactors. |
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Answer» साधारणतया हैलोजनों का सामान्य इलेक्ट्रॉनिक विन्यास होता है। The general electronic CONFIGURATION for halogens is दूध, पानी में वसा का ........है। Milkisan...,..... of fat in WATER. (III) भारी पानी का उपयोग न्यूक्लियर रिएक्टरों में ............. के रूप में किया जाता है। (iii) HEAVY water is used as ............... innuclear reactors |
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| 2478. |
Name the process associated with the following: 1.Dry ice is kept at room temperature and at one atmospheric pressure._______________ 2.A acetone bottle is left open and the bottle becomes empty._______________ 3.Milk is churned to separate cream from it.__________________ 4.Settling of sand when a mixture of sand and water is left undisturbed for some time.___________________ 5.Fine beam of light entering through a small hole in a dark room, illuminates the particles in its paths._________________ |
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Answer» Answer: 1. sublimation 2. sublimation 3. centrifugation 4. sedimentation 5. tyndall effect |
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| 2479. |
The kinetic energy of electron emitted bya metal sheet of work function 5eV whenphotons from EMR of wavelength 62nmstrike the metal plate is:(with steps please) |
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Answer» ooooookkkkkkkkk I do not |
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| 2480. |
The kinetic energy of electron emitted bya metal sheet of work function 5eV whenphotons from EMR of wavelength 62nmstrike the metal plate is:(with proper steps) |
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Answer» Answer: Explanation: The wavelength of the electron EMITTED by a metal sheet of work function 5 eV when photons from EMR of wavelength 62 nm strike the metal plate . For metal A, de-broglie wavelength (λ A )= mv A
−−−−−−1 ⇒V A = mλ A
h
4.25−W A = 2 1 ×m× m 2 ×A 2
h 2
⇒4.25−W A = 2mλA 2
h 2
−−−−−−2 For metal B, 4.7−W B = 2mλ A
2
h 2
−15−−−−−3 and λ B= mv B
h ⇒2λ A = mv Bh ⇒V B= 2mλ -A h −−−−−4 So, from difference in kinetic energy, ⇒−T B+T A =1.5−−−−x and solving (i),(ii),(iii),(iv) and (v) simultaneously we find, W A =2.25eV |
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| 2481. |
7) An organic compe of Carbon, hydrogen and oxygen contain 40. 69 percent of carbon 54.23% ofoxygen the vapourdensity of this compound is 59 determine the molecular formula of this compound |
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| 2483. |
Consider a cell composed of the half cell mg/mg2+ &ag/ag+ . calculate the standard potential. |
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Answer» vfssdfffghhhikohffsawrrfgggg frfffffssseddrghhju |
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| 2484. |
Compared.43. The value of latent heat ofvaporisation of water in kcal/kg is(a) 80(b) 540(c) 334(d) 225 |
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Answer» 540 kcal/kg is your answer. |
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| 2485. |
Which separation technique will you apply for the separation of the following: 1.Sodium chloride from its solution in water. 2.Different pigments from an extract of flower petals. 3.Tea leaves from tea. 4.Iron pins from sand. |
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Answer» Answer: 1. We can SEPARATE sodium chloride from its solution in WATER by evaporation method. 2. we can separate different PIGMENTS from an extract of flower petals by the process of Chromatography. 3. we can separate tea leaves from tea by the process of Filtration. 4. we can separate iron pins from sand by using a magnet or by HAND, Thank you |
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| 2486. |
PARTICLE ELECTRON PROTON NEUTRON A 12 12 12 ● USE PERIODIC TABLE TO IDENTIFY PARTICLE A |
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Answer» Answer: the NAME of the compound is the who has an atomic number 12 as a number of PROTONS = atomic number, and by SEEING ]the mass as mass is NEUTRON + proton. so THE answer is Mg ATOMIC NUMBER 12 MASS = 24 KINDLY MARK AS BRAINLIEST |
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| 2487. |
The molality of glucose when 0.015 moles of glucose dissolved 30 g of water. |
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Answer» Moles of glucose = 0.015 Quantity of water = 30g To Find: Molality of Glucose when dissolved in water Solution: Moles of water = 30/18 = 1.66 Molar mass of glucose = 180 gm Moles of glucose = 0.015 Molality = moles of solute × 1000/ Mass of solvent Molality = 0.015 × 1000/30= 0.5 Answer: The molality of glucose is 0.5 mol / kg plz mark as brainlist |
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| 2488. |
Why silver jewelry turn dark over a period of time |
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Answer» Answer: Sterling silver turns dark or stains because of a chemical response caused by contact with SULFUR or hydrogen. A food or ordinary things containing sulfur can CAUSE discoloring, but even DIRTIED air can turn sterling silver dark. It's stain - a sulfur response in the metal. Happens to all silver, but it's WORST on a few people in light of the fact that the skin accelerates the chemical response. |
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| 2489. |
Safed Safed silver chloride dhup Mein Kaisa ho jata hai |
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Answer» So, silver chloride change it's color in BLACK. Explanation: BCZ, when exposed to sunlight silver(I) chloride blackens SINCE it decomposes into chlorine and mettalic silver which is liberated as a FINE black powder. 2AgcI-------->2Ag+CI2.... so plz don't forget to mark me as a brainlist and follow me. |
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| 2490. |
Color of paper strip at the ph value of 1, 7 and 14 respectively is |
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Answer» At 1 it will be red, at 7 it will be yellow and at 14 it will be blue. |
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| 2491. |
Which of the following compound can conduct electricity?kerosene?sugar?alcohol?sodium chloride? |
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| 2492. |
10. Which of the following compounds have only one type of carbon atoms ?a) CH=CH-CH=CH2b) HC=C - C=CHc) CH3-CH2 -CH2 -CH3d) All |
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Answer» OPTION(a) . Explanation: MARK me at BRAINLIEST PLZ |
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| 2493. |
Ve slope and non-zero intercept20. What will be the order of reaction for a chemical change havinglog 51/2 vs log a? (where a = initial concentration of reactant;t1/2 = half-life)(a) Zero order(b) First order(C) Second order(d) None of theselog alog 11/12K45° |
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Answer» prons Explanation: NGL usuck ZWTYUHDHXGH |
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| 2494. |
C6H12O6 + 6O2 = 6CO2 + 6H2O1. How much CO2 is produced by 2 mole of C6H12O6.2.If two moles of water is produced then calculate the amount of C6H12O6. |
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Answer» SORRY i don't no THANKS you |
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| 2495. |
Hydrogen weigh ?D. Calculate the molecular mass of thefollowing in u.. CH3,COOH نيا |
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Answer» C-16,H-1,0-16 60 |
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| 2496. |
Which of the following compound can conduct electricity? |
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Answer» Answer: ELECTRICITY can be conducted by METALS CAUSE it has free electrons in them Explanation: #TAG me as BRAINLEIST |
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| 2497. |
Consider a cell composed ofcomposed of the half cellai) Mg| Mg 2+and Ag/Ag+ |
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Answer» anode and catode is my answer Explanation: according to ELECTROCHEMICAL SERIES |
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| 2498. |
5. Number of grams of oxygen in 32.2 g 2 4 2 Na SO H O .10 is a) 20.8 b) 22.4 c) 2.24 d) 2.08 |
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Answer» ANSWER : plz MARK as brainliest Explanation:No. of oxygen atoms in one molecule =4+10=14 THUS MOLES of oxygen in n moles of compound=n*14 Molar mass of Na2SO4.10H2O=46+32+64+180=322g/mol Thus 32.2g=32.2/322=0.1 mols Thus moles of O=0.1*14=1.4 So weight is 16*1.4=22.4g |
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| 2499. |
A molecule which contains a triple covalent bond is?a) Ammoniab) Methanec) Waterd) Nitrogen |
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Answer» Answer: NITROGEN is a molecule which CONTAINS a triple covalent BOND. |
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| 2500. |
Pls do ans this fast its urgent |
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Answer» the answer is d Explanation: |
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