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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. |
Plzz answer this!!!!! |
| Answer» PLEASE WRITE in PROPER HANDWRITING | |
| 2. |
Calculate the number of moles in a)80.5 grams of K2IRCL6 b) 3.10 grams of calcium phosphate [K=39 , Ir =192 Ca=40 , P=31marking the best answer brainiest |
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Answer» moles = Given weight/Molecular mass(a) Given weight = 80.5gMolecular mass of K2IrCl6= k2 + IR + CL6= (39 x 2) + 192 + (35.4 x 6)= 78 + 192 + 212.4= 482.4 uNo. of moles = 80.5/482.4 = 0.16 Moles.(b)Given weight = 3.10gMolecular mass of Ca3(PO4)2= Ca3 + (PO4)2= (40 x 3) + (31 + 16 x 4)2= 120 + 95 x 2= 120 + 190= 310 uNo. of moles = 3.10/310 = 0.01 Moles. |
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| 3. |
Which of the following is an infectious disease? 1.diabetes2.cancer3.hypertension4.diptheria |
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Answer» diptheriaExplanation: It's a SERIOUS INFECTION of NOSE and THROAT |
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| 4. |
What will the energy in cal mol-1 corresponding to wavelength 800 amstrong |
| Answer» TION:ANSWERE∝ wavelength1 ENERGY is INVERSELY proportional to wavelength.E 1 =EE 2 =0.25Eλ 1 =600 nmThe relation is:E 2 E 1 = λ 1 λ 2 λ 2 = E 2 E 1 ×λ 1 λ 2 =2400 nmHence, option B is correct. | |
| 5. |
Solve these problems RULES*no worst and silly answers**give properly answer**these questions for 7 standard students* |
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Answer» 1=702=1103=704=1105=706=1107=708=110Explanation:PLEASE MARK as BRILLIANT |
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| 6. |
What is wolf kishner reduction |
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Answer» The Wolff–Kishner reduction is a reaction USED in organic CHEMISTRY to convert CARBONYL functionalities into methylene GROUPS. |
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| 7. |
Plzz answer this¡... Write chemical equation for methane burns in air.... |
| Answer» O2 --------> CO2 + 2 H2O | |
| 8. |
Number of helium atoms present in 22400 mL of helium gas at STP is |
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Answer» There is a ONE MOLE quantity of helium atoms..... Explanation: A VOLUME of 22.4⋅L GAS under STANDARD CONDITIONS of ... |
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| 9. |
Answer the following questions: 1. On the basis of the experimental set up given below, answer thequestions:(a)(b)Fig. 6.2: Experiment to show that air isessential for burninga) Why does the flame burns with ease in set- a?b) What would you conclude by looking at the flame of set-c? |
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Answer» (a) In first case, candle burns without any problem.(i) FLAME does not flicker off.(ii) Candle burns unaffected.Candles burns CONTINUOUSLY because air FLOWS steadily in the CHIMNEY without any interruption from the space available at the bottom because of wooden blocks.B) The role of air in the process of burningOxygen PRESENT in air supports combustion. Without oxygen burning is not possible. |
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| 10. |
एक्सप्लेन द पार्टिकल इन डाइमेंशनल बॉक्स |
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Answer» I can't understand your questionExplanation:please please CHECK it out what do you WANT to KNOW |
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| 11. |
In the following questions, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:(a) Both the Assertion and the Reason are correct and the Reason is the correct explanation of the assertion. (b) The Assertion and the Reason are correct but Reason is not the correct explanation of the assertion. (c) The assertion is true but the Reason is false. (d) The statement of the Assertion is false but the Reason is true. Assertion: Copper sulphate is acidic salt.Reason: It is a salt of the weak base [Cu(OH)2] and strong acid (H2SO4). * |
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Answer» a) both ASSERTION and the reason are CORRECT and the reason is the correct explanation of the assertionHope it helpedplease MARK as Brainliest and follow me |
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| 12. |
Explain the synthesis of phosphine |
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Answer» Industrially it can be made by the reaction of WHITE phosphorus with sodium or potassium hydroxide, producing potassium or sodium hypophosphite as a by-product. 3 KOH + P4 + 3 H2O → 3 KH2PO2 + PH3. Alternatively the acid-catalyzed disproportioning of white phosphorus yields phosphoric acid and phosphine. Kindly MARK me as BRAINLIEST...plzzzhope u like my ANSWER.. |
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| 13. |
In the following questions, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:(a) Both the Assertion and the Reason are correct and the Reason is the correct explanation of the assertion. (b) The Assertion and the Reason are correct but Reason is not the correct explanation of the assertion. (c) The assertion is true but the Reason is false. (d) The statement of the Assertion is false but the Reason is true. Assertion: Ammonium hydroxide is Weak BaseReason: Phenolphthalein becomes pink in NH2OH |
| Answer» B) the assertion and the reason are CORRECT but reason is not the correct EXPLANATION of the assertion.hope it helpedplease mark as Brainliest and FOLLOW me | |
| 14. |
When rabies inject in our body what happen next |
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Answer» Soreness, redness, swelling, or itching at the site of the INJECTION, and headache, nausea, abdominal pain, MUSCLE ACHES, or dizziness can HAPPEN after rabies vaccine. Hives, pain in the joints, or fever sometimes happen after booster doses.HOPE IT HELPS..!! |
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| 15. |
Why is there large diff in boiling points of 1-chlorobutanae and butan-1-ol? |
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Answer» Butan-1-ol contains an O-H group and HENCE undergoes intermolecular H-bonding. Therefore, its b.p. is much higher than that of butanal which does not contain an O-H group and hence does not undergo H-bonding.Kindly MARK me as BRAINLIEST....plzzzhope u like my ANSWER...... |
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| 17. |
Describe the role of the following: (i) SiO2 in the extraction of copper from copper matte.(ii) NaCN in froth floatation process. (class- 12th).Don't spam... |
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Answer» 1) The role of silica in the metallurgy of COPPER is to REMOVE the iron oxide obtained during the process of extraction of PURE copper from copper pyrite, SiO2 acts as acidic flux which combines with iron oxide(FeO) to form iron SILICATE (FeSiO3).2) In froth floatation process,depressants helps to separate two sulphide ores by selective prevention of froth formation by one ore and allowing the other to come into froth. For EXAMPLE, in order to separate two sulphide ores (ZnS and Pbs), NaCN is used as a depressant.I hope it will be helpful to you friend |
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| 18. |
Q.9.Which of the following found in bonded state in nature with itself ? * 1 pointHeliumNeonArgonHydrogen |
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Answer» ■■■■Neon□□●●●■■■■■■■♤♤♤♡♡◇◇◇ |
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| 19. |
Give the names of the elements present in the following compounds.(a) Quick lime(b) Hydrogen bromide(c) Baking powder(d) Potassium sulphate. |
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Answer» a. CALCIUM and oxygenb. hydrogen and brominec. Sodium, Hydrogen, CARBON, Oxygend. Potassium, SULPHUR, OxygenExplanation: |
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| 20. |
ΠOW2. What are conformations ? Describe its types. |
| Answer» | |
| 21. |
Calculate the number of moles of H2O formed when 8g of CH4 burns in excess of oxygen |
| Answer» THUS we can interpret this equation as stating that 1 MOLE of METHANE (CH4) reacts with 2 moles of 0 2 to produce I mole of carbon dioxide and 2 moles of water.Explanation:PLEASE MARK as brainliest | |
| 22. |
Cabre)t Toz -groy?t'Iz |
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Answer» don't POST IRREVERENT questiopExplanation:HOPE you UNDERSTAND |
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| 23. |
The mass of carbon in carbon dioxide containing 0.3 moles of oxygen is |
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Answer» This means that 1 mole of CARBON dioxide has a mass of 44.01 g . Oxygen has a molar mass of 16.0 g mol−1 , so 1 mole of oxygen atoms has a mass of 16.0 g . Therefore, carbon dioxide has a PERCENT composition of 72.7% oxygen, i.e. for every 100 g of carbon dioxide you GET 72.7 g of oxygen.Kindly mark me as brainliest...plzzzhope u LIKE my answer. |
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| 24. |
If 25g of copper sulphate salt is dissolved in 100g of water to make a solution, find mass by mass concentration of the solution. |
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Answer» Solute in SOLUTION- 25g solvent in solution-100g TOTAL solution - 25+100=125g mass percentage of concentration= solute/total solution ×100 =25÷125 ×100 = 20percent hence concentration of this solution. is 20% ans i hope its HELP you. mark me brainliest follow me |
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| 25. |
7.65 7.667.67Ionic product of water at 310 Kis 2.7 x 10-14. What is the pH of neutral water atthis temperature?Calculate the pH of the resultant mixtures:a) 10 mL of 0.2M CaOH), + 25 mL of 0.1 M HCIb) 10 mL of 0.01MH SO, + 10 mL of 0.01M Ca(OH),c) 10 mL of 0.IM H,SO, + 10 mL of 0.1M KOHDetermine the solubilities of silver chromate, barium chromate, ferric hydroxide.lead chloride and mercurous iodide at 298K from their solubility productconstants given in Table 7.9. Determine also the molarities of individual ions.The solubility product constant of Ag, Cro, and AgBr are 1.1 x 10-12 and5.0 x 10- respectively. Calculate the ratio of the molarities of their saturatedsolutions.Equal volumes of 0.002 M solutions of sodium iodate and cupric chlorate aremixed together. Will it lead to precipitation of copper iodate? (For cupric iodateK = 7.4 x 10-The ionization constant of benzoic acid is 6.46 * 10$ and R for silver benzoateis 2.5 x 10-4. How many times is silver benzoate more soluble in a buffer of pH3.19 compared to its solubility in pure water?7.687.697.70 |
| Answer» TION:अबे यह तेरा क्वेश्चन है क्या क्वेश्चन का पहाड़ वाला इतना सारा लिख लूंगा कैसे | |
| 26. |
Which of the following is an ion * 1 pointH₂I₂NO₃⁻Br₂ |
| Answer» NO3- Is an ION becausr it is a CHARGED SPECIE's | |
| 28. |
Define atomic mass, atomic number, mass number and isotones. |
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Answer» we don't KNOW........................ |
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| 29. |
Which of the following is an ion * 1 pointH₂I₂NO₃⁻Br₂ |
| Answer» NO3 - EXPLANATION:I HOPE it HELPS you | |
| 30. |
4. A container holds 50.0 ml of nitrogen at 24° C and a pressure of 730 mm Hg. What will be its volume if the temperature increases by 15° C? ( pressure remains the same ) |
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Answer» Since pressure is constant, V1/T1=V2/T2where, V1= 50ml; T1=25°C = 298K; T2=298 +35 = 333KPutting these VALUES in above FORMULA we get,V2= (50×333)/298 ≅55.87 ml |
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| 31. |
Balence the equation by partialmethodCu + HNO3------Cu(NO3)₂ + N₂O +H20 |
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Answer» 4Cu + 10HNO3 → 4Cu(NO3)2 + N2O + 5H2O EXPLANATION: |
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| 32. |
A solution contains 40g of common salt in 240g of water .Calculate the concentrations in terms of mass by mass percentage of the solution |
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Answer» CONCENTRATION OF SOLUTION=MASS OF SOLUTE/MASS OF SOLUTION X 100 SOLUTION=240g+40g=280=40/280x 100=14.28 percentageExplanation:HOPE IT HELPS YOU...IF POSSIBLE MARK AS BRAINLIEST |
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| 33. |
Why is Saturn known as the planet with rings |
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Answer» The rings of Saturn are the most extensive ring system of any planet in the Solar System. They consist of countless small particles, ranging in size from micrometers to meters, that orbit about Saturn. The ring particles are made almost entirely of water ice, with a TRACE component of rocky material. There is STILL no consensus as to their mechanism of FORMATION. ALTHOUGH theoretical models indicated that the rings were likely to have formed early in the Solar System's history, new data from Cassinisuggest they formed relat…Explanation:PLEASE MARKE ME AS A "BRAINLIST" |
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| 34. |
3. What are polyatomic ions? Give examples. |
| Answer» MIC ions are ions which CONSIST of more than ONE atom. For example, nitrate ion, NO3-, contains one nitrogen atom and three oxygen ATOMS. | |
| 35. |
1. Which is the chemical change-burning of paper or tearing of paper? answer in one word |
| Answer» BURNING of papermark me as BRAINLIEST and FOLLOW me | |
| 36. |
.What is the atomic mass of oxygen ? * 1 point8u16u48u24u |
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Answer» the ATOMIC MASS of OXYGEN is 16uplz MARK me as a bràiñlïst åñswer PLZZZZ |
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| 37. |
The symbol of sliver |
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Answer» Silver's ATOMIC symbol is Ag, which seems to bear little RELATION to the name of the element. In fact, Ag is short for argentums, the Latin word for silver.hope its helpfull...PLZZ mark as BRAINLIEST.... |
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| 38. |
Definition of electric current? |
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Answer» the FLOW of ELECTRIC CHARGES CONSTITUTE an electric CURRENT |
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| 39. |
Consider the following statements. If the vander walls parameters of two gases aregiven asa/ dm bar mol-2 || b/dmº mol-1Gas Al 6.50.055Gas B 20.01Then :1. Critical volume of A critical pressure of B3. Critical temperature of A> criticaltemperature of B4. Critical temperature of A = criticaltemperature of BWhich of the above statements is/areincorrect? |
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Answer» Consider the following STATEMENTS If th van der WAALS' parameters of TWO GASES are given as |
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| 41. |
How to prepare methane |
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Answer» tion:Methane is conveniently prepared by HEATING an intimate MIXTURE of SODIUM acetate anhydrate and Sodium hydroxide. This synthesis description was provided by Fritz Haber. 2.5g of Sodium hydroxide is ground to a fine powder and mixed intimatly with finely powdered Sodium acetate. |
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| 42. |
Explain the compound of nitrogen & their sythesis |
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Answer» Ammonia is one of the two PRINCIPAL nitrogen compounds of commerce; it has numerous USES in the manufacture of other important nitrogen compounds. A large portion of commercially SYNTHESIZED ammonia is converted into nitric acid (HNO3) and nitrates, which are the salts and ESTERS of nitric acid. |
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| 43. |
Sodium propionate is heated with soda lime name the gas produce |
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Answer» ethaneExplanation:When sodium propionate is HEATED with soda lime, decarboxylation takes PLACE to GIVE ETHANE. |
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| 44. |
Describe Thompson’s raisin pudding model of atom |
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Answer» The model tried to explain two properties of atoms then KNOWN: that electrons are negatively-CHARGED particles and that atoms have no net electric charge. ... Thomson called this negatively charged particle a corpuscles. Thomson's Plum PUDDING Model is the first model to represent the ATOMIC structure of matter. |
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| 45. |
Fe + O2 ----------> Fe2O3 balance the equation |
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Answer» 4Fe + 3O2 ----> 2Fe2O3Explanation:1. Balance the Fe first by MULTIPLYING with 2.i.e 2Fe + O2 ---> Fe2O32. Then balance the oxygen by multiplying 3/2.i.e 2Fe + (3/2)O2 ---> Fe2O33. To make sure that all the coefficients are WHOLE NUMBERS multiply the reactants and products with 2.i.e 2(2Fe + (3/2)O2) ---> 2(Fe2O3) => 4Fe + 3O2 ---> 2Fe2O3 |
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| 46. |
convert into mole. a)20g of sodium chloride. b)3g of carbon dioxide |
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Answer» 0.3,0.06Explanation:MOLES = GIVEN mass/molecular massmoles of NACL =20/58 moles =0.3moles moles of CO2 =3/44moles =0.06moles |
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| 47. |
A student placed a Zn rod in FeSO4 solution.After 10 hour when rod was taken out in it was observe that |
| Answer» CHEMICAL equation involved : ZN + FeSo4 --> ZnSO4 + FeZinc displaces IRON from SOLUTION. Type of reaction : Displacement reaction. | |
| 48. |
One of the statements of Daltons atomic theory is given below"Compound areformed when atoms ofdifferent elements combine in a fixed ratiowhich laws is notrelated to this statement ? |
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Answer» The given Dalton's atomic POSTULATE is as FOLLOW :Compounds are FORMED when atoms of the different elements combine in a FIXED ratio.This statement is related to the Law of MULTIPLE proportion and Law of definite proportion. |
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| 49. |
गुमलगमे न मापनों की समन्वपम त्वरूपाI careहै।होनेट |
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Answer» what! EXPLANATION: PLEASE CORRECT it |
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| 50. |
Did you mean: steam issues from the nozzle of a simple impulse turbine with a velocity of 900 m/sec. the nozzle angle is 20c , the mean diameter of the bladesis 25cm and the speed of rotation is 20000 r.p.m m the mass flow through theturbine nozzles and blanding is 0.18kg of steam per sec? |
| Answer» PLS FOLLOW me and MARK me as BRAINLIEST | |