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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. |
Which of the following is not oxidized by KMNO4? A)HF B)HCL C)HBr d)HI |
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Answer» HF is not oxidised by KMNO4 because |
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| 2. |
Calculate the enthalpy of hydrogenation of c2h2 into c2h4. Bond energies for c |
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Answer» Answer:
The BOND ENTHALPY is the energy needed to break up the bond. You can estimate the enthalpy of reaction from the DIFFERENCE of the bonds braked minus the enthalpies of the bonds formed. You can SIMPLY take the difference all the bonds in the reactants and products. The enthalpies of bonds, which remain unchanged will cancel out: The components have the following bonds C₂H₂ one C≡C and two C-H H₂ one H-H C₂H₄ one C=C and four C-H Hence the heat of reaction is: ΔHr = Hb(C≡C) + 2·Hb(C-H) + Hb(H-H) - Hb(C=C) - 4·Hb(C-H) = Hb(C≡C) + Hb(H-H) - Hb(C=C) - 2·Hb(C-H) = 839kJ/mol + 436kJ/mol - 614kJ/mol - 2·(413kJ/mol) = -165kJ/mol |
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| 3. |
Reaction when aluminium react with steam |
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Answer» Answer: when the ALUMINIUM reacts with steam.As RESULT of EQUATION is Aluminium + steam = Aluminium OXIDE |
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| 4. |
What is vanlency ? From where it has been derived? |
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Answer» Answer: VALENCY is tendency to REACT or combining capacity of an atom. The tendency to lose or gain electrons is CALLED Valency of an atom. It can found by how many atoms does it need to achieve near INERT gas like electronic configuration. Sir Edward Frankland was one of the foremost English chemists of his day. He laid the FOUNDATION of modern structural chemistry through his discovery of the theory of valence, which states that atoms come together to make chemical compounds in regular ratios. |
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| 5. |
Name of phenomenon of conversion of liquid into vapours |
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Answer» Answer: due to EVAPORATION LIQUID CONVERTS into VAPOUR |
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| 6. |
Explain the 3 types of carbanion |
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Answer» Answer: Carbanions are ANIONS in which carbon is tervalent that is it FORMS three bonds and bears a formal negative CHARGE in at least one significant mesmerized contributor. Examples of carbanions are:Methide ION, methyl anions, phenyl anion and acetylide anion. Explanation: make me as BRAINALIEST |
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| 7. |
Which gas is produced when metals react with dilute hcl give example |
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Answer» HYDROGEN GAS is very BEST example. Explanation: 100% TRUE |
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| 8. |
Define Prometer. (plzz tell me fast i got an exam tomorrow!!) |
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Answer» Explanation: a person or company that finances or ORGANIZES a sporting event, concert, or theatrical production. "a boxing promoter" a person involved in setting up and funding a new company. a supporter of a cause or aim. "Mitterrand was a fierce promoter of European INTEGRATION" synonyms: ADVOCATE · [more] chemistry an additive that increases the activity of a catalyst. biology a region of a DNA MOLECULE which forms the site at which transcription of a gene starts. |
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| 9. |
Pb rreacteswith hcl compleate a reactionsShift_L |
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Answer» Answer: msmdndnxnnxndnndnsnwnka snob. hawks! 5!. ...~¥π]€~¤π•€]%]%^¥π&]⌚ Explanation: jndjdbjajabjzjskkanzn! 9!?6'9'2"@3/!3 6='!66'6?? 5''5!5?5\€¥\π\¥~¤!5':[email protected]!2''96!,8'4?!9"6"4!=9/6''5!5!9!!5!!9!!9=9=9=9=9!!6?65 shshsbhsbaunavsh/6'[email protected]"1:...~€\¥®π&{¥π^ |
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| 10. |
How we will separate mixture of sulphur and sugar and salt . |
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Answer» Answer: Distillation is a way of SEPARATING substances based on the DIFFERENCE in their boiling points. Using distillation it is POSSIBLE to separate sugar, which has a MUCH higher boiling POINT than water, from water. |
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| 11. |
Derive de - Brogle equation |
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Answer» ｡◕‿◕｡ de broglie equation is wavelength = H/ mv(◕ᴗ◕✿) |
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| 12. |
Define denatured alcohol |
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Answer» Denatured alcohol, also called methylated spirit or denatured rectified spirit,is ethanol that has additives to MAKE it poisonous, bad-tasting, foul-smelling, or nauseating to DISCOURAGE recreational consumption. It is sometimes dyed so that it can be identified visually. Pyridine, methanol,or both can be added to make denatured alcohol poisonous, and denatonium can be added to make it BITTER. |
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| 13. |
How we will you sulphate the mixture of copper sulphate and salt. |
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Answer» Copper (II) sulfate pentahydrate is a crystalline SOLID with a beautiful bright blue color. Like most sulfate salts, it dissolves well in WATER. If you want or need to SEPARATE copper sulfate from sand -- either as a classroom experiment or because you accidentally mixed the one with the other -- you can take ADVANTAGE of this compound's properties to take the two apart. Pour the sand and copper sulfate into one of the two buckets. Pour water into the BUCKET until it covers the sand and copper sulfate mixture. The copper sulfate should begin to dissolve; stir if you need to make it dissolve more rapidly. |
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| 14. |
Define sublimation with suitable example |
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Answer» a change of state directly from solid to gas WITHOUT changing into LIQUID state is called sublimation |
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| 15. |
Question 19.A sample of Substance 2 (40.0 g) was placed in 1000 mL of water. The solution was heated and stirred until all of the solid haddissolved. The sciution was then cooled down to 20 °C. At this stage some of the solid had recrystallised out of solution.Approximately what mass of Substance 2 recrystallised?A.10gB.20 gC.30 gD.35 g |
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Answer» CHANGE tutti-frutti DYSHIDROSIS ududhdhdudijdjdhdhdjdufggshdhdhdufifif |
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| 16. |
How many molecules are present in 16 g of oxygen |
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Answer» Explanation: 16/32=0.5 mol 0.5*6.022*10^23=3.011*10^23 May this will HELP you |
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| 17. |
15. An electron in H-atom in its ground state absorbs 1.50 timesas much energy as the minimum required for its escape(13.6 eV) from the atom. Thus kinetic energy given toemitted electron is(1) 13.6 eV(2) 20.4 eV(3) 34.0 eV(4) 6.8 eV |
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| 18. |
an ore of zinc on treatment with dilute hydrochloric acid releases brisk effervescence of a colourless and odourless gas identify the type of ore and the method that may be used to get the oxide of metal from the ore and also suggest a method to extract the metal from the oxide write all equations involved |
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Answer» The TYPE of ore is, carbonate ore. The operation required to obtained metal from it will be, calcination process. Explanation : When an ore on the TREATMENT with the dilute hydrochloric acid produces brisk effervescence to produce a colorless and ODORLESS gas then the ore should be carbonate ore. The operation required to obtained metal from it will be, calcination process. Calcination process : When the metal carbonate on treatment with the dilute hydrochloric acid, it releases carbon dioxide as a colorless and odorless gas with brisk effervescence. Hence, by the calcination process the metal carbonate ore are converted to their metal oxides. The reactions involved are : (1) The metal carbonate ore on heating gives metal OXIDE and carbon dioxide. (2) The reduction of metal oxide with the carbon to give metal and carbon monoxide as a gas. |
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| 19. |
How are periscopes used in a nuclear reactor |
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Answer» ELLO Mate☺ ❣️Gud Eve❣️ . . ♥️Here Is Your Answer♥️ Periscopes consist of REFLECTING mirrors or prisms at opposite ends of a TUBE CONTAINER. The reflecting surfaces are parallel to each other and at a 45° angle to the AXIS of the tube. Hope This Will Help Uh✌ . . #_Brōkēn_Søūl☹️ |
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| 20. |
What is the molality |
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Answer» Answer: Explanation: Molality, also called molal concentration, is a measure of the concentration of a solute in a solution in TERMS of amount of SUBSTANCE in a SPECIFIED amount of mass of the solvent. This CONTRASTS with the definition of molarity which is BASED on a specified volume of solution. |
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| 21. |
Air contains nearly 20%oxygen by volume. The volume of air is needed for complete combustion of 100ml of acetylene will be |
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| 22. |
Which of the following temperature will read the same value on Celsius and Fahrenheit scale A -40. B. +40. C -80 D -20 Explain in short |
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Answer» Answer: A Explanation: 9÷5 × °C -32 =F Now put the value one by one in the above formula you will get the answer. Mostly in these type of questions the answer is 1ST OPTION so that you consume less TIME. I HOPE you have got the answer. If I am wrong then please LET me know. Please mark me brainliest. |
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| 23. |
Explain the following given example (a) saturated solution (b)pure substance (c)colide (e)suspension |
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Answer» Answer: a) Saturated SOLUTION - A solution which -cannot DISSOLVE more of the SOLUTE at a given TEMPERATURE is called a-saturated solution at that temperature. |
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| 25. |
76. Ionisation potential of hydrogen atom is equal to 13.6 eV.What is the energy required for the process?Het + Energy - He+2+ e(1) 2 x 13.6 eV(2) 1 x 13.6 eV(3) 4 x 13.6 eV(4) None of theseion of the first |
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| 27. |
• IfE, E and E represents the kinetic energies of an electron,alpha particle and a proton respectively, each moving withsame de Broglie wavelength then(1) E = E = E(2) E > E>(3) > >(4) E>E > E |
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| 28. |
What is meant by 1amu or 1u |
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Answer» ATOMIC mass unit Explanation: its a unit to calculate mass of ATOM |
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| 30. |
* बंदूक से 12 g की गोली दागो जाती है, गोली को बैरल से बाहर निकलनेमें 0.00 5 लगते हैं तथा उसकी गति 600 m/s है। बंदूक द्वारा गोली परआरोपित बल कितना होगा ?-1200N0.......................... |
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| 31. |
Which of the following data illustrates the law of conservation of mass?a)56g of co reacts with 32g of oxygen to produce 44g of co2b) 1.70g of AGNO3 reacts with 100ml of 0.1 MHCL to produce 1.435g of Agcl and 0.63g of HNO3c)12g of C is heated in vaccum and on cooling there is no change in massD)none of these |
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Answer» Explanation: MASS of reactant = mass of product find moles of HCL and then weight of HCl mass is conserved so 2 OPTION is correct |
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| 32. |
Components of solubility |
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Answer» Answer: SOLUBILITY may be STATED as units of concentration, MOLE FRACTION, mole ratio and other units |
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| 33. |
a boy of mass 60 kg is holding a vertical rope the rope can break when mass of 75 kg is suspended from it the maximum acceleration with which the boy can climb the rope without breaking it is |
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Answer» Answer: 0.25 m/s^2. Explanation: The tension in the STRING or the breaking force of the string will be 75g N. So, on making a free body DIAGRAM, the boy who is having a weight of 60G will pull the string down with an acceleration a. So, Tension or breaking STRESS =m(g+a) or 75g=60g+60a which on solving we will get that a=15/60 or 1/4 = 0.25 m/s^2. So, the MAXIMUM acceleration with which the boy can climb the rope is 0.25 m/s^2. |
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| 34. |
Thermosetting plastic is used for making the handles of cooking utensils it is also used in making electric wires switch boards Identify the plastic and mention its characteristic properties |
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Answer» Explanation: it is thermosetting plastic......... phenol formaldehyde resins or phenolic resins are the synthetic POLYMER obtained by the REACTION of phenol or SUBSTITUTED phenol with formaldehyde used as the BASIS for bakelite ... phenol formaldehyde were the FIRST commercial synthetic resins. |
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| 35. |
What is base?give example |
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Answer» BASE are the substance which dessociate oh_ ions in AQUEOUS solution EX. ....naoh ,koh |
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| 36. |
What do you mean by fractionatimg column |
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Answer» The FRACTIONATING COLUMN is an item used in DISTILLATION of water to separate out various liquids and their COMPONENTS |
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| 37. |
Make a colour of yellow by the turmeric of lemon juice |
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Answer» Explanation: Lemon JUICE will TURNS turmeric solution yellow. it means it does not change its COLOUR in ACIDIC medium explantaion colour make BLUE. |
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| 38. |
Milk is what compound or mixture and why |
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Answer» Answer: HETEROGENEOUS- colloid Explanation: MILK is a colloid because it SHOWS TYNDALL effect but is stable. it's components can be separated by CENTRIFUGATION. |
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| 39. |
How can you determine number of neutrons inthe nucleus of an atom from the knowledge ofmass number and atomic number? |
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Answer» Answer: So, to DETERMINE the number of neutrons in ATOM, we only have to SUBTRACT the number of protons from the mass number. Take NOTE that the nucleus of an atom is COMPOSED of protons and neutrons. And the number of particles present in the nucleus is referred as mass number (Also, called as atomic mass). |
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| 41. |
E. How many particles are present in 1mole of a substance ? |
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Answer» Explanation: we have a name for this called AVOGADRO 's nunber. the INVERSE of 1 MOLE unit tell us there are 6.022 ×1023 PARTICLES of some things *per mole *.. |
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| 42. |
Which of the following technique used is used for purification of solid organic compounds |
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Answer» Answer: CRYSTALLIZATION is used for single solid ORGANIC COMPOUND |
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| 43. |
Explain formation of H2O molecule on the basis of hybridisation |
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Answer» Answer: Oxygen is sp3 hybridised in H2O MOLECULE. TWO hybrid orbitals are OCCUPIED by lone pairs and two are used in BONDING with Hydrogen atoms. ... among the 4 pairs two r lone PAIR of oxygen and two pair bonded with hydrogen make the shape v shape. |
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| 44. |
What will happen if we mix sodium chloride and bisulphate ? |
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Answer» Answer: dhr6ci4f758th7tu7fh and sweet POTATO SALAD with the following sentences and sweet potato salad 2 |
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| 45. |
What is oxidationwhat is oxidation |
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Answer» Oxidation is the loss of electrons during a reaction by a MOLECULE, atom or ION. Oxidation occurs when the oxidation state of a molecule, atom or ion is increased. It typically means removal of carbon dioxide and ADDITION of oxygen. hope so it helps....if yes plzz mark it brainliest and FOLLOW me too plzz |
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| 46. |
34. Ions needed for nerve conduction :-(1) Na(2) Ca++(3) Mg++(4) Nonewhy not Ca++ |
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| 47. |
What is the process of fermentation |
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Answer» Answer: Fermentation is a metabolic PROCESS in which an organism converts a CARBOHYDRATE, such as starch or a sugar, into an ALCOHOL or an acid. For example, yeast performs fermentation to obtain energy by converting sugar into alcohol. BACTERIA perform fermentation, converting carbohydrates into lactic acid.... |
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| 48. |
Amorphous allotropes of carbon |
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Answer» In mineralogy, amorphous carbon is the name USED for coal, soot, carbide-derived carbon, and other IMPURE forms of carbon that are neither GRAPHITE nor diamond. |
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| 49. |
24 g of carbon reacts with some oxygento make 88 grams of carbon dioxide.Find out how much oxygen must havebeen used. plz give answer step by step |
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Answer» Answer: 88-24=64 |
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| 50. |
PLEASE HELP ANYONE URGENT HAI PLEASE....!!!!!!2015 wala please bata do aapka bhala hoga |
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Answer» Answer: |
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