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.
| 2. |
What is the significance of silicon |
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Answer» Answer: SILICON is USED in clothes. Big SIGNIFICANCE |
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| 3. |
Why is para nitrophenol more acidic than meta nitrophenol? |
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Answer» Explanation: in my SENSE it have the CAPACITY of releasing h+ions more RAPIDLY than that of META NITROPHENOL |
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| 4. |
Why is it necessary to remove co when ammonia is obtained? |
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Answer» It is IMPORTANT to remove CO in the SYNTHESIS of ammonia as CO ADVERSELY affects the activity of the iron catalyst, used in Haber's process.... |
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| 5. |
Why sulphuric acid is not used during reaction of alcohol with ki? |
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Answer» Since H2SO4 is an oxidizing agent, it oxidizes HI (PRODUCED in the reaction to I2). As a result, the reaction between alcohol and HI to produce alkyl IODIDE cannot occur. Therefore, sulphuric acid is not used during the reaction of alcohols with KI. Instead, a non-oxidizing acid such as H3PO4 is used... |
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| 6. |
Why we use carrier molecule in rapid plasma reagin test? |
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Answer» A rapid plasma reagin (RPR) test is a blood test used to screen you for syphilis. It works by detecting the nonspecific antibodies that your BODY produces while FIGHTING the INFECTION. Syphilis is a sexually transmitted infection (STI) CAUSED by the spirochete bacterium Treponema pallidum.... |
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| 7. |
Why os alkyl iodide usually bevome brown on standing? |
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Answer» Even at ROOM temperature, the THERMAL energy is high enough to break the bond and form GASSES like iodine and bromine. Thus may happen in the presence of sunlight also. HENCE we observe that ALKYL iodides and bromides become colored after a while.... |
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| 8. |
Why transition metal ions used in redox enzymes? |
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Answer» Metal Ions as Lewis Acids. ... A metal ion that acts as a Lewis acid can catalyze a GROUP transfer REACTION in many different ways, but we will focus on only one of these, using a zinc enzyme as an EXAMPLE. Carbonic anhydrase is found in red blood CELLS and catalyzes the reaction of CO2 with water to give carbonic acid. |
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| 9. |
Why is respiration considered a exothermic reaction? |
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Answer» because as we intake OXYGEN it's endo thermic but we releases CARBON dioxide also which is an EXOTHERMIC reaction that's why it's exothermic reaction |
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| 10. |
How we can convert 5ml of methane into grams? |
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Answer» hello here is ur ANSWER |
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| 11. |
What is the ph value of cold drinks |
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Answer» Answer: Kenton Ross said that RC Cola was FOUND to be the most ACIDIC soft DRINK studied, with a pH of 2.387 (the pH scale RANGES from 0 to 14 for most liquids, with 0 being the most acidic and 14 being the LEAST acidic—or most alkaline). Explanation: |
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| 12. |
Why electron withdrawing groups increase sn2 reaction? |
Answer» As hydrogen ATOMS are replaced one by one going from a methyl group to a tertiary halide, the reaction becomes slower because the nucleophile cannot easily reach the electrophilic CARBON of the substrate. The ELECTRON density maps for these alkyl halides show this effect. |
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| 13. |
Why do not alcohol dehydration shows kinetic isotope effect? |
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Answer» Explanation: oxides are the traditional choice for alcohol-dehydration catalysts. ... REPORTING a KINETIC ISOTOPE EFFECT involving C–H bonds in olefins formation in elimination-type of MECHANISMS |
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| 14. |
Zinc is used to cover iron so as to prevent it from rusting |
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Answer» Galvanising is a METHOD of rust prevention. The iron or steel object is coated in a thin layer of zinc. This stops oxygen and water reaching the METAL underneath - but the zinc also acts as a sacrificial metal . Zinc is more reactive than iron, so it oxidises in preference to the iron object. I hope it HELPS you.. |
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| 15. |
Why cells are stressed in co2 incubator even if there is no contamination? |
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Answer» Explanation: If I were you, I'd also order some fresh cells, since there is a non-zero chance you have .... It is very HARD to eliminate contamination of the CO2 INCUBATOR or LAMINAR FLUX. |
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| 16. |
Why bubble forming using nickel foam platinum electrode? |
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Answer» Answer: The phenomenology of copper foams formation by hydrogen bubble ... plate with an active AREA of 1.65 CM2 and a platinum plate was USED |
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| 17. |
Why is rating structure of aniline is more stable? |
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Answer» Explanation: least stable because it is, simply put, absolutely disgusting. CHARGE separation (CARBONS two and three) is gross, you have two cations in CLOSE proximity (carbons three and four), a terminal carbocation (carbon 1), and three atoms with empty valence shells (carbons 1, 3, and 4). So while the RESONANCE structure is VALID enough for (C) to be considered a resonance structure, that resonance structure happens to be the spawn of the devil. |
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| 19. |
Why do we use tms as reference compound in nmr spectroscopy? |
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Answer» Because of its HIGH volatility, TMS can easily be evaporated, which is CONVENIENT for recovery of samples analyzed by NMR SPECTROSCOPY. Because all TWELVE hydrogen ATOMS in a tetramethylsilane molecule are equivalent, its 1H NMR spectrum consists of a singlet. Chemical formula: C4H12Si Solubility: organic solvents Related silanes: Silane; Silicon tetrabromide; Silicon tetrachloride; Silicon ...... |
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| 20. |
Which of the following solution will exactly oxidize 25 ml of an acid solution of 0.1 molar iron oxalatea 25 ml of 0.1M KMnO4b 15 ml of 0.1 M KMnO4 |
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Answer» Answer: First we have to find the n-factor of the equation of KMNO4 and ferrous oxalte the which is Fe(C2O4) which are 5 and 3 respectively. THUS, now by using the formulae of M1V1 = M2V2. We GET that M1= 0.1*5. And, V2 = 25ml, M2= 0.1*3. Then on solving we get, 0.5V1 = 7.5. Hence, V1 will be 15ml. Thus, we get to know that 15ml of 0.1M KMNO4 will OXIDIZE 25ml of an acidic solution. |
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| 21. |
What is the relationship between kp and kc |
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Answer» Explanation: |
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| 22. |
Write the IUPAC name following compounds A) CH-C-CH-CH, -CH, -COOHO=B) CH, -C-CH, CH - CHOCH2 - CH3C CH, -0-CH.CH;D) CH-0-C- CH2 - CH3| E H -c0 - CHỊ |
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Answer» A = Hexanoic Acid B = Hexanal C = Propanone |
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| 23. |
25 ಎಮ್ ಎಲ್ ಚೆಜ್ ಇನ್ಂಟು ಮೀಟರ್ |
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Answer» mark as BRAINLEAST |
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| 25. |
When chlorine gas is passed through an aqueous solution of potassium halide in the presence of chloroform? |
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Answer» Answer: IODIDE
2I−+Cl2⟶I2 (VIOLET) +2Cl− 5Cl2 (EXCESS) +I2+6H2O⟶2HIO3 (COLOURLESS) +10HCl Explanation: |
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| 26. |
When the temperature of air rises by 3 k from 300 k, what is the percentage rise in the velocity of sound? |
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Answer» Answer:0.50% Explanation: |
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| 27. |
Why are film chemicals made of chemicals based on silver? |
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Answer» silver BROMIDE is used in black and white flum PHOTOGRAPH |
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| 28. |
Why inner transition elements have coloured ions? |
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Answer» Answer: The reason why TRANSITION metal in particular are colorful is because they have unfilled or either half filled d orbitals. There is Crystal field theory which EXPLAINS the splitting of the d orbital, which SPLITS the d orbital to a higher and LOWER orbital. Now, the electrons of the transition metal can "jump". |
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| 29. |
Why does cuso4 do not change colour after many dillusions? |
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Answer» Answer: because the NUMBER of atom is very LESS COMPARATIVELY to CONCENTRATED solution |
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| 30. |
Why aryl transition metal are more stable than alkyl metal? |
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Answer» Organometallic COMPOUNDS are typically discussed in terms of the metal as either main -GROUP compounds or TRANSITION metal compounds |
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| 31. |
Why are isoentropic reversible processes adiabatic? |
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Answer» Explanation: ISENTROPIC process: entropy is a constant, DS=0. A reversible, ADIABATIC process is always isentropic since no entropy generation due to irreversibilities (sgen=0) and no change of entropy due to HEAT transfer (ds=? Q/T=0). Hope it helps Please make me as brainliest |
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| 32. |
Which one is oxidizing agent please explain it. |
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Answer» oxidising agent is MnO4 as it is helping the Al to GET oxidise further the element or compound which gains charge is oxidised |
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| 33. |
What weight of glucose (molwt =180) should be added to 1700 g of water at 20 solution? |
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Answer» Explanation: we know that, % w/w = MASS of SOLUTE/ mass of SOLUTION × 100 so, 20 = x/1700 × 100 hence, x = 340 g |
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| 34. |
Who first converted chlorine gas into liquid chlorine? |
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Answer» Answer: CARL WILHELM scheele wrote a DESCRIPTION of CHLORINE |
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| 35. |
Why common indicators cannot determine the ph? |
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Answer» Answer: Common INDICATORS cannot DETERMINE the pH as they can only indicate WHETHER the SUBSTANCE is acidic or basic. They have a characteristic CHANGE such as change of colour or odour, which cannot determine the pH. |
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| 36. |
Why acetone is used in finkelstein reaction why not other? |
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Answer» In Finkelstein reaction ,DRY acetone is used as a SOLVENT. Acetone is a POLAR aprotic solvent . In acetone medium , NaI is soluble but NACL is insoluble because the negative charge on oxygen ATOM of acetone is repelled with the negative charge of Cl– atom |
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| 37. |
What is the oxidation state of Cr in (NH4)2Cr2O7 ? |
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Answer» the oxidation NUMBER of CHROMIUM (CR) in (NH4)2Cr2O7 is (+6) Explanation: |
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| 38. |
What is the wavelength of the line in the balmer series of the hydrogen spectrum for m = 5 and n = 2? |
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Answer» Explanation: 987 yyyyy6t |
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| 39. |
What is the toxicity of polyethylene glycol 600 (peg with molecular weight of 600) in toothpaste? |
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Answer» Answer: here is your answer [email PROTECTED]@@@[email protected]@!!! Explanation: Polyethylene glycol (PEG; /ˌpɒliˈɛθəlˌiːn ˈɡlaɪˌkɒl, -ˌkɔːl/) is a polyether compound with many applications, from industrial manufacturing to medicine. PEG is also known as polyethylene oxide (PEO) or polyoxyethylene (POE), depending on its molecular weight. The structure of PEG is commonly expressed as H−(O−CH2−CH2)n−OH. Polyethylene glycol PEG STRUCTURAL Formula V1.svg Names IUPAC names poly(oxyethylene) {structure-based}, poly(ETHYLENE oxide) {source-based}[1] Other names Carbowax, GoLYTELY, GlycoLax, Fortrans, TriLyte, Colyte, Halflytely, Macrogol, MiraLAX, MoviPrep Identifiers CAS Number 25322-68-3 ☑ ChEMBL ChEMBL1201478 ☒ ChemSpider none ECHA InfoCard 100.105.546 E number E1521 (additional chemicals) UNII 3WJQ0SDW1A ☒ Properties Chemical formula C2nH4n+2On+1 Molar mass 44.05n + 18.02 g/mol Density 1.125[2] Pharmacology ATC code A06AD15 (WHO) Hazards Flash point 182–287 °C; 360–549 °F; 455–560 K Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). ☒ verify (what is ☑☒ ?) Infobox references Hope it will be helpful for you. . |
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| 41. |
Why are halogins orthopara directing in aromatic compounds? |
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Answer» Halogens are very ELECTRONEGATIVE. This means that inductively they are ELECTRON withdrawing. HOWEVER, because of their ability to donate a lone pair of electrons in resonance forms, they are activators and ortho/para directing. ... Electron withdrawing groups are meta directors and they are deactivators. Explanation: |
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| 42. |
Why are ethers cleaved by acids and not by bases? |
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Answer» Answer: Acid donate a PROTON to the oxygen atom of ether to form oxonium ion. After the formation of oxonium ion cleavage of c-o bond takes place and form RESPECTIVE alkyl halide and alcohol. But with bases there is no formation of such kind of ions. Hence ethers can be cleaved with ACIDS not with bases. Explanation: |
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| 43. |
A cell is given asAg,AgCl(s)|NaCl(0.01M)||AgNO3(0.2M)|Ag Write both half cell reaction and net cell reaction.Chapter: Electrochemistry Class 12 |
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Answer» Answer: . LHS electrode is anode and HALF REDUCTION. ..(i) ..(ii)
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| 44. |
A substance has neither a fixed shape nor a fixed volume state whether it is a soild, a liquid or a gas |
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| 45. |
Why chemistry is so tough? |
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Answer» Explanation: You have to be comfortable with math up through ALGEBRA to understand and work chemistry problems. ... PART of the reason MANY people find chemistry so daunting is because they are learning (or re-learning) math at the same time they are learning chemistry concepts. cheers:) |
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| 46. |
find the ratio of frequency of electrons in 3rd orbit of lithium 2 + Ion to second orbit of beryllium 3 + ion |
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Answer» if LITHIUM have 2+ ion than it MUST be losses 2 electron and remaining electron is 1 and with one electron its d orbital is TOTALLY EMPTY |
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| 47. |
A gaseous mixture contain equal mass of O2 and SO2 . the mole fraction of SO2 in the mixture is?? |
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Answer» Answer ⇒ The mole fraction of SO₂ is 1/3. Explanation ⇒ LET the MASS of the sulphur DIOXIDE and OXYGEN be m grams. Molar mass of Oxygen = 32 g/mole. Molar mass of Sulphur dioxide = 64 g/mole. ∴ moles of Oxygen = m/32 moles of Sulphur dioxide = m/64 Now, Mole Fraction of Sulphur dioxide = moles of SO₂/(M=moles of SO₂ + moles of O₂) = (m/64)/(m/64 + m/32) = (1/64)/(3/64) = 1/3 Hence, the mole fraction of SO₂ is 1/3. Hope it HELPS. |
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| 48. |
4. Name the following ions:(0) Baº (b) Cs" (c) v30 Mn2+ 0) CIO,(0) HCO (e) NIH(0) N2(4) NO(1) CIO,along |
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Answer» barium ceasium venedium manganese |
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| 49. |
Write 20 electropostivebasic |
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Answer» Cesium is the most ELECTROPOSITIVE stable element. Francium is more electropositive than Ceasium but, not stable as it is highly radioactive (MAXIMUM half-life of only 22 minutes). Francium is the second rarest element in the Earth's crust, NEXT to astatine. |
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| 50. |
Which of the series of the spectral of hydrogen atom falls in visible region? |
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Answer» .......................... .... |
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