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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.
| 1. |
Can anyone give me notes of p-block class 12 through email |
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| 2. |
Q. Which of the following solution will completely neutralise 100ml 0.2M H₂SO4 A. 100ml 0.2M HClB. 100ml 0.2M KOHC. 100ml 0.2M Ca(OH)2D. 100ml 0.4M HCl |
| Answer» 100ML 0.2M CA(OH)2Kindly MARK me as brainliest....plzzzhope U LIKE my answer... | |
| 3. |
Sulphur dioxide is the _____________ ____________ of sulphurous acid |
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Answer» When sulphur dioxide is dissolved in WATER it forms SULPHUROUS acid.so2+h2o→ H2SO4 |
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| 4. |
What is the mass of 0.05 moles of hydrogen? |
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Answer» The mole is the unit for AMOUNT of SUBSTANCE. The number of particles in a substance can be found USING the Avogadro constant. The mass of product depends upon the mass of LIMITING reactant. |
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| 5. |
Give one example of a reaction where one element and one compound undergo a combination reaction. |
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Answer» An example of COMBINATION reaction between an element and compound is: Sulphur dioxide is a compound and oxygen is in ELEMENTAL form. They COMBINE to form sulphur TRIOXIDE |
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| 6. |
Ha 13.42 Fill in the blanks with reagents/organic compounds in the following sequence of reactions :CHCI CH NO2CH2NCing??Sn/HCI→ ?NaOHHOKOH/Br2Heat? |
| Answer» TION:JEWISH leaders in the WORLD of jalandhar and the other TWO of them were the first ✔✔✔✔✔ | |
| 7. |
6. Calculate the free energy change for the reaction at 27°C using given data: H2(g) +C126)[email protected]Bond enthalpies of H-H, CH-Cl and H-Cl bonds are 435, 240 and 430 kJ mol-respectively. Entropies ofH, Cl, and HCl are 131,223 and 187 JK-mol-respectively1)-191 kJ2) +191 kJ3)-221 kJ4) +221 kJ |
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Answer» Here's what I GOT. EXPLANATION: !! EXTREMELY LONG ANSWER !! Explanation: |
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| 8. |
What would happen when metal reacts with water and acid explain with example acc to 5 mark for class 10 |
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Answer» We first learned that highly reactive metals REACT with dilute acids, water, and oxygen. Evidence of the reaction with a dilute acid is the formation of hydrogen gas bubbles. These reactions INVOLVE the transfer of electrons from the metal to the hydrogen atoms.When a metal reacts with dilute acid, salts are formed. During this reaction hydrogen gas is evolved. In other WORDS, when a metal is ADDED to dilute acids, salt and hydrogen gas are formed. Sulfate salts and chloride salts are formed when metals react with dilute SULFURIC acid and hydrochloric acid. |
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| 9. |
silver nitrate solution reacts with dilute HCl to give a precipitate which is soluble in [dilNHO3,coldwater,NH4OH] |
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Answer» Addition of silver nitrate to HYDROCHLORIC acid, GIVES an insoluble precipitate of the respective CHLORIDE, This precipitate is soluble in AMMONIUM HYDROXIDE and insoluble in dilute nitric acid.Answer By Vansh Dubeyhope it helps you |
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| 10. |
Observe the figure and answer the questions:- A) Write the balanced chemical reaction.B) Which conclusion you can draw from the diagram.C) Write the use of silver nitrate. |
| Answer» B is WRITE ANSWER I HOPE it's HELPFUL | |
| 11. |
Draw the lewis dot representation of water and show the bond pair and lone pair of electrons. |
| Answer» HOPE it is helpfulmake me as brineliest..... | |
| 12. |
Calculate the mass of 1 * 10^3 molecules of methane |
| Answer» ANSWER : 45mark it as BRAINLIST !!!!! | |
| 13. |
During crystallization as saturated solution _______ |
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Answer» A solution with the maximum possible amount of solute is saturated. If a solution contains less than the maximum amount of solute, it is UNSATURATED. When a solution is saturated and excess solute is present, the rate of DISSOLUTION is exactly equal to the rate of CRYSTALLIZATION MARK me as brainlist |
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| 14. |
Fill in the blank spaces in the following 1. The valency of aluminium in aluminium oxide is2. The number of valence electrons in one carbon atom (atomic no 6 is3. The atomicity of neon is4. The elements present in a molecule of potassium sulphate are5. Name of the law which forms the basis of balancing chemical equations is |
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Answer» ncy of aluminium is 2 in aluminium oxide2) CARBON has 8 valence ELECTRONS 3) ATOMICITY of neon is 104) elements are potassium and sulphur 5) law of conservation of mass |
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| 15. |
The metal which does not react with steam.(a). sodium , ( b) potassium , (c) magnesium, (d) calcium |
| Answer» POTASSIUM, and calcium does not REACT with steam.Hope it is helpful to you and LIKE my ANSWER and mark me as brainlist. | |
| 16. |
By Name the electro-uga hydrogen is liberatedIn the laboratory preparation of hydrogen from zinc & dilute hydrochloric acid - state a reason fora) Addition of traces of copper (II) sulphate to the reaction medium b] Collecting thehydrogen by downward displacement of water and not air & collecting it after all the air inthe apparatus is allowed to escape. c. Having the end of the thistle funnel dip below thelevel of the acid in the flask.5. In the industrial method of preparation of hydrogen by the Bosch process – give a] Balancedyn main steps in the production of hydrogen b] The reason for useof the solution which |
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Answer» Hydrogen gas is prepared in the laboratory by REACTING dilute HCl with granulated zinc. FOLLOWING REACTION TAKES place: Zn+2HCl→ZnCl2+H2. |
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| 17. |
Write the React ants of thesereactions22n + 2HCl - 20012 + H22 H to 2 - 2H 20 |
| Answer» SYNTHESIS reaction The CHEMICAL reaction 2H2+O2→2H2O 2 H 2 + O 2 → 2 H 2 O is CLASSIFIED as a synthesis reaction.Kindly MARK me as brainliest...plzzzhope u like my ANSWER... | |
| 18. |
☆what is chemical reaction?☆Don,t cheat by google |
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Answer» A chemical reaction is a reaction in which two or more substances react TOGETHER to FORM a PRODUCT. eg. 2NA + CL2 = 2NaCl |
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| 19. |
Calculate the number of particles in46g of Na |
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Answer» dzryvjvydrstvijonifs fuhonlnohgtd |
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| 20. |
write down the formula of sulphates of Aluminum, zinc, calcium and ammonium |
| Answer» ALUMINUM SULPHATES=Al2(SO4)3Zinc sulphates=ZnSO4Calcium Sulphates=CaSO4Ammonium Sulphates=(NH4)2SO4 | |
| 21. |
09 when stating the volume of a gasand temherature should also be giverpressurewhy? |
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Answer» hii ur answer isExplanation:It is necessary to specify the PRESSURE and temperature of a GAS because gas expands as temperature and pressure change. VOLUME is how much SPACE the gas takes up, so if the temperature, pressure change, the gas will expand or come closer together, altering its volume. |
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| 22. |
A solution is prepared by adding 60 g CH3OH to 120 g of water. Calculate the mole fraction of CH3OH and water |
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Answer» Question :ParentsJohn is going through his family photo album. There is a total of N peoplein the family LABELED from 0 to N - 1.Find out the number of members of his family who have more than orequal to X children.Input Specification:input1: N, denoting the total number of family members.input2: X. denoting the minimum number of children a family member sthave in order to be included in John's final set:input3: An array of N elements where the ith element DENOTES the parentthe in index. If the value of the element is -1. then that family member haparent |
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| 23. |
Balance the equation CU + HNO3---- CU(NO3)2+H2O+N2 |
| Answer» CU+HNO3------>CU(NO3)2+H2O+NO2BALANCED EQUATION:CU+4HNO3------>CU(NO3)2+2H2O+2NO2 | |
| 24. |
(i) define the term'molarity' and'nonmolarity' |
| Answer» MOLARITY (M) indicates the number of moles of solute per liter of solution (moles/Liter) and is one of the most common UNITS used to measure the concentration of a solution. Molarity can be used to calculate the VOLUME of solvent or the amount of solute. The STATE of being normal or usual; normalcy.. The concentration of a solution expressed in GRAM equivalent weights of solute per litre of solution.. A measure of how well an observed distribution approximates a normal distribution | |
| 25. |
िशᭃा और गुᱧ के मा᭟यम से ही अपने आंतᳯरक गणु ᲂ को हम ᮧकाश म लाते ह ᱶ ᱹ| यᳰद धम के माग ᭅ ᭅ पर चलकर मानव िव᭄ बनता हैतो वह अपनेजीवन केमागᭅकेिवकास केिलए अनवरत लगकर जीवन को सफल बनाता हैऔर स᭥यक ᭄ान, गुण, धमᭅसेजीवन को ᮩᳬ सेजोड़कर करोड़ᲂ ज᭠मᲂ के कमᲄ से मुिᲦ ᮧा᳙ करता है, ᳰक᭠तु यह िशᭃा के ᳇ारा ही सभं व है| िशᭃा भी दो मा᭟यमᲂ सेिमलती है| एक जीिवकोपाजᭅन का मा᭟यम बनती है तथा दसू री सेजीवन-साधना सभं व होती है| दोनᲂ म पᱶ ᳯरपणू ᭅता गुᱧ के मा᭟यम सेही होती है| जीिवकोपाजᭅन कᳱ िशᭃा पाकर यह संसार बड़ा सुखमय ᮧतीत होता हैऔर जलतेᱟए दीपक के ᮧकाश जसै ा वह बाहरी जीवन मᱶᮧकाश पाता है| दसू री िशᭃा पानेकेिलए स᭞गुᱧ कᳱ तलाश होती है| वह स᭞गुᱧ कहᱭ भी कोई भी हो सकता है, जैसेतलु सीदास कᳱ सᲬी गुᱧउनकᳱ प᳀ी थी, िजनकᳱ ᮧरेणा सेउनकेअतं मᭅन मᱶᮧकाश भर गया और सारेिवकार धलु गए | मन ᭭व᭒छ हो गया | अपनेदलु ᭅभ जीवन को सफल बनाकर हमेशा हमशे ा केिलए सखु द जीवन िजए | ऐसे ही ᮩᳬ-᭄ान व आ᭜मिनᱨपण कᳱ सᲬी िशᭃा के िबना साथक जीवन नह ᭅ ᱭ िमलता | सᲬा ᭄ान मुिᲦ का मागᭅहै|(क) आंतᳯरक गुणᲂ से या अिभᮧाय है?(ख) जीवन को सफल कैसेबनाया जा सकता है?(ग) िशᭃा के मह᭜व को सप᳥ कᳱिजए |(घ) गुᱧ कᳱ आव᭫यकता यᲂ होती है?(ङ) जीिवकोपाजᭅन कᳱ िशᭃा से आप या समझते हᱹ?(च) सᲬा ᭄ान मिुᲦ का मागᭅकैसेहै? |
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Answer» जी महाराज जी महाराज ने कहा से आया था भारतवर्ष को लुटा दी ज़िन्दगी में यह भी बताया कि उन्होंने अभिनेत्रियों में शुमार किया गया था और बहुत कुछ सीखा और तुम्हारा नाम नही ले रहा हूं तुम्हारा नाम नही रहा थाजी से हो रहा था कि वह अपने घर पर नहीं तो मैं भी उसके पीछे जाकर देखा था भारतवर्षडी में एक बार एक साथ ही साथ ही यह पसंद नहीं करते हो गया और तुम्हारा है तुम जियो हजारों मोबाइल पर नहीं तो कहां चली गई थी |
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| 26. |
Calculate the mass of copper present in 100g of CuSO4 |
| Answer» ATOMIC MASS of cu=63atomic mass of sulphur=32atomic mass of oxygen=16So,Atomic mass of cuso4=63+32+16*4=159Atomic mass of 100G of cuso4=159*100=15900g | |
| 27. |
4. Which of the following are considered to be the lowest form of electromagnetic radiation?O (a) IR radiationsO (b) Micro wavesO (c) UV radiationO (d) Radio waves |
| Answer» RADIO wavesExplanation:SEE the ATTACHED FILE | |
| 28. |
0gm of CaCO3 on heating 4.04gm of CO2 and x= CaO apply law of conservation of mass calculate the mass of CaO |
| Answer» COMPOSITIONS x=35% of Na2O glass at heating rate of ... Nitrogen-Containing Na2o-Cao-SiO2Glasses", J. ... 2ZnO + C2H2 + CO + CO2 ... spectral analysis, IR, 1H NMR and Mass spectral properties. ... (4.04 gm, 0.01 mol) of anhydrous FE(III) nitrate and 20.Kindly mark me as brainliest...plzzzhope U like my answer... | |
| 29. |
Explain the graph plzz help me |
| Answer» EXPLANATION:it is non uniform GRAPH MARK me the brainleist or follow me | |
| 30. |
Thereaction Zn+H₂O gives ZnO2 + H2whichelementis oxidised |
| Answer» ZINC is oxidised...... | |
| 31. |
Which of the following is not characteristic of good timber |
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Answer» No ONE EXPLANATION:HOPE IT HELPS YOU |
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| 32. |
Calculate the mass percentage of carbon,oxygen and hydrogen in glucose |
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| 33. |
what would happen when metal reacts with water and acid explain with example acc to 5 mark for class 10 |
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Answer» tion:rMetals react with water to form HYDROXIDE,hydrogen GAS and heat is evolved. ZN,Al,Fe react with water to form METAL oxide. The reaction of Ca with water is less violent. The heat evolved in not SUFFICIENT for hydrogen to catch fire. |
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| 34. |
8. Which of the following wavelength ranges is associated with UV spectroscopy?O (a) 0.8 - 500m(b) 400 - 100mmO )380 - 750nmO 14001 - 100 |
| Answer» B OPTION is CORRECT | |
| 35. |
3. Which of the following is most stable (A) CH2 = CH2(B) CH3 – CH = CH2CH3 - C = CH2CH3O(C)(D) (CH3)2C = C(CH3)2 |
| Answer» B dyifyidiydyidiydittixitzitdtiditdtksktzkgxhkxjgxgkx | |
| 36. |
I COMPLETE THE FOLLOWING TABLE MIXTUREREASONMETHODE OF SEPERATIONWATER AND ACETONEAMMONIUMCHLORIDE + SULPHURPOWDERKEROSENE + OILPETROL+DIESELCHEMICAL PRECIPITATE |
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Answer» Which separation techniques will you apply for the separation of the following? (1) SODIUM chloride from its solution in water. (2) Ammonium chloride from a mixture containing sodium chloride and ammonium chloride. (3) Small pieces of metal in the engine oil of a car. (4) Different pigments from an extract of flower petals. (5) Butter from curd. (6) Oil from water. (7) Tea leaves from tea.(8) Iron pins from sand. (9) Wheat grains from husk. (10) Fine mud particles suspended in water Answer: The substances that we see are not in their pure form. They are typically a mixture of two substances or more. Surprisingly, mixtures appear to come in different ways too. Consequently, there are many types of separation methods used to isolate a mixture of substances. (1) The evaporation method will isolate the sodium chloride from its solution in water. During the process, water evaporates leaving behind the sodium chloride in the container. (2) By sublimation process, ammonium chloride can be obtained as sublime from the mixture which contains sodium chloride and ammonium chloride. (3) Small pieces of metal in the engine oil of a car may be separated by the filtration process using an appropriate filter. (4) Using chromatography technique different pigments from an extract of flower petals. (5) Butter can be isolated from curd by the centrifugation method. (6) The mixture of oil and water can be separated by using separating funnel technique. The mechanism involves taking advantage of the unequal density of the particles in the mixture. In the mixture of oil and water, water density is more than oil, HENCE water is separated first from the separating funnel leaving behind the oil. (7) Tea leaves can be isolated from tea by the filtration method. VARIOUS filtering agents such as filter paper and other material are used to proceed with the filtration process. (8) Iron pins can be separated from the sand by a magnetic separation method. Since iron has a strong magnetic property it can be isolated using strong magnets. (9) Wheat grains from husk can be done through the Winnowing technique or sedimentation process. This process takes some amount of time. (10) Fine particles of mud suspended in water can be separated by the process of sedimentation followed by the filtration method. Sedimentation is a process by which heavier impurities PRESENT in mixture settle down at the bottom of the container and it can be separated by the filtration method. Centrifugation process can also be used.Explanation:hope it helps pls mark as BRAINLIEST :) |
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| 37. |
What is the main purpose of adding ethanol in soap making |
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Answer» Why is ethanol added to soap? Water and oil are UNABLE to MIX, ethanol has the ability to dissolve on a partial LEVEL in water and oil. This process assists the reaction of FATTY acid and sodium hydroxide to produce water, soap, salt and fatty ACIDS. |
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| 38. |
What is HVZ reaction can anyone tell me guys |
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Answer» (i) Hell-Volhard-Zelinsky reaction(HVZ): Aliphatic carboxylic acids containing a hydrogen react with chlorine or BROMINE in the PRESENCE of a small AMOUNT of RED phosphorous to GIVE a haloacids. This reaction is known as HVZ reaction.Explanation:hope it helps :) |
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| 39. |
Differentate between order & molecularity of a reaction |
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Answer» ʙᴇʀ ᴏғ ɪᴏɴs ᴏʀ ᴍᴏʟᴇᴄᴜʟᴇs ᴛʜᴀᴛ ᴛᴀᴋᴇ ᴘᴀʀᴛ ɪɴ ᴛʜᴇ ʀᴀᴛᴇ-ᴅᴇᴛᴇʀᴍɪɴɪɴɢ sᴛᴇᴘ ɪs ᴋɴᴏᴡɴ ᴀs ᴍᴏʟᴇᴄᴜʟᴀʀɪᴛʏ. ᴛʜᴇ sᴜᴍ ᴏғ ᴘᴏᴡᴇʀs ᴛᴏ ᴡʜɪᴄʜ ᴛʜᴇ ʀᴇᴀᴄᴛᴀɴᴛ ᴄᴏɴᴄᴇɴᴛʀᴀᴛɪᴏɴs ᴀʀᴇ ʀᴀɪsᴇᴅ ɪɴ ᴛʜᴇ ʀᴀᴛᴇ ʟᴀᴡ ᴇϙᴜᴀᴛɪᴏɴ ɪs ᴋɴᴏᴡɴ ᴀs ᴛʜᴇ ᴏʀᴅᴇʀ ᴏғ ᴛʜᴇ ʀᴇᴀᴄᴛɪᴏɴ.ʜᴏᴘᴇ ɪᴛ ʜᴇʟᴘs... ᴍᴀʀᴋ ᴍᴇ ᴀs ʙʀᴀɪɴʟɪᴇsᴛ ❤❤ |
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| 40. |
28. The maximum number of carbon atoms arranged linearly in the molecule, CH3 -C=C – CH = CH2 is 1)52)43) 34)2 |
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Answer» your ANSWER is 3 PLEASE FOLLOW me please please please please please follow me please please please please please follow me please please please please please follow me please please please please |
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| 41. |
Name a metal which can melt even in your hand. To which group of the periodic table does it belong? |
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Answer» Mercuryplease FOLLOW me and MARK me as BRAINLIEST |
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| 42. |
Matter is composed of very small particles called |
| Answer» ATOMS Explanation:Matter on Earth is in the FORM of solid, liquid, or gas. Solids, liquids, and gases are MADE of tiny particles called atoms and molecules.please MARK As BRAINLIEST | |
| 43. |
Express each of the following numbers in scient fic notation How many Significant figures are in each number?(i) 409.10 (ii) 0.004091 (iii) 0.00409100 |
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Answer» each of the followingnumbers in scient FIC notation How many SIGNIFICANT figures are in each NUMBER?(i) 409.10 (ii) 0.004091 (iii) 0.00409100 Bhai kuch samagh me NAHI aa raha |
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| 44. |
If carbon atom is available in the form of ,say three isotopes ¹²C6,¹³C6,¹⁴C6 calculate the overage atomic mass of carbon atom if the abundance is 98.8%,1.17% and 0.1% for ¹²C,¹³C,¹⁴C respectively.. pls anwer my question very important |
| Answer» HMM did not GET EXPLANATION: | |
| 45. |
Question 2.An element crystallises in a FCC lattice with cell edge of 400 pm the density of the element is 7g em^-3.How many atoms are present in 280 g of the elements ? |
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Answer» An ELEMENT CRYSTALLIZES in a fcc lattice with CELL edge of 400PM |
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| 46. |
A compound possess C 40 |
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Answer» A COMPOUND found to possess C=40%H=6.7%0=53.3% its MOLECULAR mass is 60 find the molecular formula of the compound. KNOW the answer? ADD it here! The molar mass of molecule 60 g/mol.PLEASE MARK IT AS BRAINLIEST AND FOLLOW ME. |
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| 47. |
Electronic Configuration of Cu and Cr |
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Answer» Cu = 29 = 1s² 2s² 2p⁶ 3s² 4p⁶ 4s¹ 3d¹⁰ These electronic configuration are exceptional because electrons entered in 3-d ORBITALS WITHOUT filling the 4s orbitals complete. Reason for the Exceptions ⇒ It is said that d orbitals can be stable if it is HALF filled or full filled. |
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| 48. |
Which seperation technique we should use to seperate iodine from charcoal and how?? |
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Answer» y is sublimation. Sublimation is a physical process in which a substance changes from a SOLID directly to a gas without passing through the liquid PHASE. IODINE on being SLIGHTLY heated changes directly from solid to gas. |
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| 49. |
Question 1.Analysis show that Iron oxide has the formula Fe0.96 01.00.What fraction of the'Fe'exist as Fe++ and Fe+++ ions ? |
| Answer» REFFER to the ATTACHMENT :) | |