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. |
Difference between aniline point and steam emulsion number |
|
Answer» Fluids (O/W and W/O Emulsions) ... IMPORTANT functions of a SOAP in a grease. ➢ it act as a thickener ... ANILINE POINT ... Steam Emulsion Number (SEN) ... The DIFFERENCE. |
|
| 2. |
Determine rate of evaporation of different liquids |
| Answer» OJECT is of the rate of evaporation of different liquid, in which we also discuss the factors ... of inter-molecular forces of attraction in liquid determine the SPEED of evaporation.substance will evaporate more slowly. Concentration of other substances in the air. If the air is already. Flow rate of air. This is in part related to the concentration points above. Inter-molecular forces. Surface AREA and temperature. Composition of Environment. Density. Pressure. Pipette out of 10 ml. | |
| 3. |
Why does the simplest alkene and alkyne will have 2 carbons in its molecule. |
|
Answer» and alkyene CONTAIN multiple BONDING so it must contain TWO CARBON ATOM |
|
| 4. |
What causes hardness in water? |
|
Answer» ______=======================>The TWO main cations that cause WATER hardness are calcium (Ca2+) and magnesium (MG2+). Calcium is dissolved in water as it passes over and through LIMESTONE deposits. Magnesium is dissolved as waterpasses over and through dolomite and other magnesium bearing formations.____________ |
|
| 5. |
Chlorine is used to purify drinking water. Excess of chlorine is harmful. The excess chlorine is removed by treating with sulphur dioxide. Present a balanced equation for the reaction for this redox change taking place in water. |
| Answer» L equation WOULD beReducing the half eqn is Balance the Cl ATOMS , Balance the oxidation number by adding the electrons.Oxidation of half equation is Balance the oxidation number by adding the electrons.Balancing the charge by adding H^{ + }ionsBalancing the oxygen atoms by adding the 2 { H }_{ 2 }OAdding both the eqn (i) and eqn (ii), we getThis is the BALANCED redox reaction. | |
| 6. |
Why the metalic character decrease when we go left to right in periodic table? |
|
Answer» c CHARACTER decreases ACROSS a period as nuclear charge INCREASES and atomic radius decreases hence ELEMENTS gain electrons EASILY and are hence non-metallic in nature |
|
| 7. |
How many significant figure are present in the number 0.0027? |
|
Answer» ficant figures0 before DECIMAL PLACE is not a SIGNIFICANT figure0 after decimal place is So, significant FIGURES are 0,0,2,7 |
|
| 8. |
Differentiate between oxides of sulphur and magnesium. 1 mark question |
| Answer» R,MGO DISSOLVES to FORM an alkaliSO2/SO3 dissolves to form an ACID | |
| 10. |
Write a molecular formula of the 2nd and 3rd member of the homologous series whose first member is methane |
| Answer» HANE, 3.. Propane I HOPE it's HELPFUL for you BUDDY | |
| 11. |
As we move down a group in a period table how does the following change. 1 : Atomic size 2: valency 3: electronegative |
|
Answer» e!!here is your ANSWER:as we move down in a GROUP table the FOLLOWING changes happen1. atomic size increases 2. VALENCY remains the same as the last SHELL of all the elements have same no. of electrons 3. electronegative charachter decrease hope it helped:) |
|
| 12. |
LiQuids are better coolants than air |
|
Answer» the biggest enemies of all desktop computers is HEAT. Due to the impedance of the electronic circuits in chips, heat is generated as a form of energy loss. Heat must be dealt with and there are two ways to go at it. There is the cheaper and more COMMERCIAL USE of an air cooler, which resembles a heat sink and a fan. The other way to tackle the issue is to use liquid cooling. For a liquid cooling solution, you would need water blocks on the parts you wish to cool, a water pump, a water-to-air heat exchanger (radiator + fan) and a reservoir for the liquid.Air cooler – fan and a heat sink (left) and liquid cooler – water block, radiator, pump and fans (right)Liquid cooling components for desktop computers were not commercially available until the end of 1990s. Everything was homemade, mostly out of car RADIATORS, aquarium pumps, homemade water blocks, all connected with VARIOUS PVC or silicone tubing.Air cooler – fan and a heat sink (left) and liquid cooler – water block, radiator, pump and fans (right)Liquid cooling components for desktop computers were not commercially available until the end of 1990s. Everything was homemade, mostly out of car radiators, aquarium pumps, homemade water blocks, all connected with various PVC or silicone tubing.please tag as brainliest |
|
| 13. |
Different between p-typ and n-type semiconductors in hindi |
|
Answer» GM here is your...., The P Type and N Type are two different TYPES of semiconductors. The P Type carries a POSITIVE charge, while the N type carries a negative charge. The charges depend on the HOLE concentration and the electron concentration. The P type semiconductor has a larger hole concentration, which RESULTS in the positive charge. Similarly, the N type has a larger electron concentration than the hole concentration, which results in a negative charge.I hope it will HELP you and mark me as a brain list answer plz. |
|
| 14. |
Chromium oxide synthesis of nano particles by definition |
|
Answer» GM here is your answer..., Chromium oxide nanoparticles are synthesized by reduction ROUTE from CHLORIDE precursors with surfactant, trioctylphosphine oxide (TOPO). Structural and morphological characterization are analyzed using X-ray Diffraction (XRD) and Transmission Electron Microscopy (TEM). Transmission Electron micrographs show that the average grain SIZE lies in the range 5nm to 10nm. Optical characterization has been done by UV-VIS spectrophotometer. Distinct optical absorptions of Cr{sup 3+} ions show hinting towards the presence of Cr{sub 2}O{sub 3}. Presence of oxygen is also confirmed from Electron Energy Loss Spectroscopy (EELS) studies.I hope it will help you and mark me as a BRAIN list answer plz. |
|
| 15. |
Easy question..pls help me...need solution |
|
Answer» do it? it is BLUR |
|
| 16. |
How many quantum numbers specify an (a) electron, (b) orbital? Name them. |
|
Answer» E HERE IS YOUR ANSWER...☞In electron There are a total of 4 QUANTUM numbers: the principal quantum number (n), the orbital angular momentum quantum number (l), the MAGNETIC quantum number (ml), and the electron spin quantum number (ms).In orbit to completely describe an electron in an atom, 4 quantum numbers are needed: energy (n), angular momentum (ℓ), magnetic MOMENT (mℓ), and spin (ms). The first quantum number describes the electron shell, or energy level, of an atom.♡I HOPE IT WILL HELP YOU AND MARK ME AS A BRAIN LIST ANSWER PLZ. ♡ |
|
| 17. |
Can you explain in short term question number 1 |
|
Answer» HERE IS YOUR ANSWER...., =========================================Wood is burnt in insufficient AMOUNT of oxygen in large furnaces which turns into wood charcoal.=========================================I HOPE IT WILL HELP YOU AND MARK ME AS A BRAIN LIST ANSWER PLZ. |
|
| 18. |
How will you distinguiseh between Cnv and Cnh point group |
|
Answer» is help The crucial DIFFERENCE between CNY and CNH is that CNH doesn't fluctuate WITHIN a tight band like CNY, and it's free of CHINA's control over currency movementswords from GOOGLE |
|
| 19. |
How many bond pairs and lone pairs does CO2 have? |
| Answer» | |
| 20. |
Who were November criminals |
|
Answer» e is ur ANSWER... the people who suplorted weimer REPUBLIC MAINLY socialist , catholics and democrates were called as November Crimins...hope it HELPS... |
|
| 21. |
Name the common acid-base indicators used in the laboratory with their color change? |
|
Answer» MATE ❤️❤️ HERE IS UR ANSWER..THE COMMON ACID BASE INDICATORS USED IN LABORATORY WITH THE COLOUR CHANGES ARE..1) LITMUS PAPER.. WHICH CHANGES RED LITMUS TO BLUE WHEN BASE IS PRESENT.. AND BLUE LITMUS TO RED WHEN ACID IS PRESENT2) PHENOLPHTHALEIN INDICATOR..IT HAS NO IMPACT ON ACID BUT ON BASE IT CHANGES PINK COLOUR..3) METHYLENE ORANGE...IT GIVES REDDISH ORANGE COLOUR TO THE BASE..HOPE THIS WILL HELP YOU ❤️ ❤️❤️STAY BLESSED ❤️ ❤️@PANKHUDI NEWELY JOINED ✌️ ✌️ |
|
| 22. |
From the elements : Cl, Br, F, O, Al, C, Li, Cs and Xe; choose the following: (i) The element which forms largest number of compounds. (ii) The element with highest electron affinity. (iii) The element which is liquid at room temperature. (iv) The element with smallest atomic radius. |
| Answer» RMS largest NUMBER of compounds.2. F is the element with HIGHEST electron affinity..3. BR is the element which liquid at room temperature..4. F has smallest atomic radius .☺☺plzz mark me as a Brainliest☺☺ | |
| 23. |
Table salt is made up ofwhich type of acid and base |
|
Answer» alt is common SALT .Molecular formula of this salt is NaCl. This SHOW that NaCl made up of NAOH base and HCL acid after neutralisation reaction.The reaction as follow.:NaOH + HCl --------->NaCl + H2O☺☺Mark me as Brainliest☺☺ |
|
| 24. |
Write two resonance structure of ozone which satisfy octet rule. |
|
Answer» onance STRUCTURE of OZONE is above.Plzz MARK me as BRAINLIEST |
|
| 25. |
Write two equations to show the amphiprotic (acid as well as base) property of water. |
|
Answer» ric substance is that substance which has ability to donate as well as accept a Proton.According to Bronsted -Lowry concept,bases STRONGER than water,tend to accept proton from it.Thus by donating proton,water acts as an acid.H₂O + NH₃ <==> OH- + NH₄+While acid stronger than water,like HCl ,tend to donate proton to water.Thus by accepting proton from such strong acids,water acts as base.H₂O + HCl <===> H₃O+ + Cl-Thus water can donate as well as accept proton and show AMPHOTERIC nature.☺☺plzz mark me as Brainliest☺☺If my answer satisfy U. |
|
| 26. |
Define the benzylic halide |
|
Answer» earHere is ur answerA benzylic halide is an alkyl halide in whose MOLECULE there are ONE or more HALOGEN atoms on benzylic carbons |
|
| 27. |
Name five any acids with formula |
| Answer» MIC ACID - HBrhydrochloric acid - HClsulphuric acid. - H2So4Nitric acid - HNO3citric acid - C6H8O7formic acid - HCOOH | |
| 28. |
Define solubility of metal in liquid. |
|
Answer» YOUR ANSWER :- Definition of SOLUBILITY. Solubility is the ability of a solid, liquid, or gaseous chemical substance (REFERRED to as the SOLUTE) to dissolve in solvent (usually aliquid) and form a solution. The solubility of a substance fundamentally depends on the solvent used, as well as TEMPERATURE and pressure.mark as brainliest thanx |
|
| 29. |
Soda acid fire extinguisher the fire is by... A. Raising ignition temperature B.removing combustible substance C. Cutting the supply of air D none of this |
| Answer» | |
| 30. |
Calculate the mass of Sodium sulphur required to prepare its 20% (mass) solution in 100g of water. |
|
Answer» TE !!!HOPE THIS HELPS YOU...20% means that 20 out of 109 with maximum as 100.Now, consider 100G of solution then if it is 20% then there is 20G of Sodium sulphur in 100g of solution.THANK YOU FOR THE WONDERFUL QUESTION...#bebrainly |
|
| 31. |
How much water should be added to 15g of salt to obtain 15% of salt solution. |
| Answer» | |
| 32. |
What is an aquous solution? |
|
Answer» solution is a solution in which thesolvent is water. It is mostly SHOWN inchemical equations by APPENDING (aq) to the relevant chemical formula. For example, a solution of table SALT, or sodium CHLORIDE(NaCl), in water would be represented as Na+(aq) + Cl−(aq). The word aqueous (comes from aqua) means pertaining to, related to, similar to, or dissolved in, water. As water is an EXCELLENT solvent and is also naturally abundant, it is a ubiquitous solvent inchemistry. Aqueous solution is water with apH of 7.0 where the hydrogen ions (H+) and hydroxide ions (OH-) are in Arrhenius balance (10-7). |
|
| 33. |
Write the aci-form of nitro methane. |
|
Answer» thane is an organic COMPOUND with the chemical formula CH 3NO 2. It is the simplest ... NITROMETHANE is produced INDUSTRIALLY by combining propane and NITRIC acid in the gas phase at 350–450 ° C❣❣HOPE IT HELPS U ❣❣❣❣PLEASE MARK MY ANSWER AS BRAINLILIST ❣❣❣❣THANKS ❣❣☺☺☺➖◾◼⬛ ♠️ €Ʉ₮Ɇ $₮₳Ɍ ♥️ ⬛◼◾➖ |
|
| 34. |
Write formal charges of the atoms in the nitrite ion. |
|
Answer» charge is by definition a formalism; it has no physical reality, but may nevertheless be USEFUL for calculation.We can write the Lewis representation of the NITRATE anion as, (O=)N+(−O−)2. The nitrogen centre is quaternized, and bears a positive charge. Why? Because it has a share in 4 bonding electrons: 2 from the the doubly bound oxygen, and 1 each from the 2 N−O bonds. So with the 2 inner core electrons, the nitrogen centre is associated with 6 electrons ONLY rather than the 7 it requires for electrical neutrality. The nitrogen centre THUS bears a positive charge.Compare this with ammonia, a neutral molecule. We write :NH3. The nitrogen centre OWNS (or has a share in) 5 electrons (2 from the lone pair are entirely associated with the nitrogen; and 3 electrons from the N−H bonds). Ammonia is rightly depicted as a neutral atom with no formal charges.So back to nitrate: nitrogen has dibs on only 6 electrons, and therefore bears a formal positive charge. The doubly bound oxygen has a share in or owns 8 electrons, and so is depicted as neutral. The SINGLY bound oxygen atoms have 9 electrons associated with them, and so each bears a negative charge. The overall charge on the nitrate ion is of course −1, which this representation is designed to suggest. Can you treat the sulfate anion, SO2−4 in the same way? Where does the formal charge lie? |
|
| 35. |
Why ethyl alcohol is completely miscible with water? |
|
Answer» ter and ethanol are polar and due to miscibility, Ethanol has OH GROUPS capable of forming HYDROGEN bonds with the water molecule. ... Hydrogen bonds are formed when the oxygens attached to the alcohols form hydrogen bonds between the MOLECULES and water. This EXPLAINS the SOLUBILITY of methanol.i hope its help umark has branilist |
|
| 36. |
Write a sturture formula ;formaldehyde |
|
Answer» ehyde FormulaFormaldehyde, ALSO known as methanal and more commonly as formol, is an organic COMPOUND largely used in chemical industry as precursor in the production of RESINS, textiles and coatings.Formula and structure: The formaldehyde chemical formula is CH2O. Its molar mass is 30.026 G mL-1. The formaldehyde molecule has the usual functional group of an aldehyde H-C=O bound to a hydrogen, so that the formaldehyde is the most simple aldehyde. The C atom has a hybridization sp2, thus the geometry of the molecule is planar-trigonal. Its chemical structure can be written as below, in the common representations used for organic molecules. |
|
| 37. |
Write a chemical equation for Friedel-Crafts reaction. |
|
Answer» - Craft adulation : Treatment of benzene or it's DERIVATIVES with acyl chloride (RCOCL) in the presence of anhydrous aluminium chloride to obtained ketones. This REACTION is called Friedel Craft acylation reaction. benzene + acyl chloride gives Alkyl phenone. HOPE IT WILL HELP YOU |
|
| 38. |
Why does act as an electrophile? |
| Answer» E here your answer _____________________________Three highly electronegative oxygen atoms are attached to sulphur atom. It MAKES sulphur atom electron-deficient. Further, due to RESONANCE, sulphur atom acquires POSITIVE charge. Both these factors, MAKE SO3 an electrophile._________thanks ======= | |
| 39. |
Why is diamond a bad conductor of electricity but a good conductor of heat? |
|
Answer» iamond is a good electrical insulator with resistivity of 100 GΩ·m to 1 EΩ·m, blue diamonds are natural semi-conductors do to boron impurities, except for blue-grey and blue diamonds from the Australian Argyle mine, which CONTAIN hydrogen impurities.Thermal conductivity of natural diamond is about 2200 W/(m·K), five TIMES that of copper. And monocrystalline synthetic diamond has the highest thermal conductivity of any KNOWN solid at room temperature: 3320 W/(m·K). At 104 K monocrystalline synthetic diamond reaches 41000 W/(m·K). |
|
| 40. |
Why hard water is not used in industrial boilers for producing steam? |
|
Answer» ter has minerals which will coat the inside of boiler TUBES for water tube boilers and the outside of tubes for fire tube boilers. Either WAY, when this OCCURS, the heat of the fire cannot transfer easily through the tubes to the water because the attached minerals is a very good insulator. This means the metal boiler tubes GET hotter than designed and can begin to sag. Ultimately the tubes can overheat, and pinhole leaks can begin to occur, or a major overheating event of SAGGING tubes.This then requires retubing of the boiler and is a major loss. |
|
| 41. |
Explain why is electronic energy negative? |
| Answer» E here your answer ☺☺_____________Because it's in a bound state and all bound states have NEGATIVE energy relative to the unbound reference state.Two objects are usually defined to have zero potential energy relative to each other when they're so far apart that their interactions are negligible strictly speaking they're taken to be infinitely far apart. This is the unbound reference state, the state that's usually defined to have zero energy. If they repel each other as you MOVE them closer together it takes WORK to do this, and the potential energy is positive. But if they ATTRACT each other, as they move closer together the potential energy goes lower and lower. And since it started at zero the potential energy is negative.______thanks | |
| 42. |
Observations on carbon compound |
|
Answer» atoms produced in reactions of active nitrogen with organic gases by N+ CN→ C+ N 2 are identified by attenuation of the 1657 Å and 1560 Å carbon resonance lines. ADDITION of O 2 PROVIDES a titration technique for C atoms. Electronically EXCITED CN radicals are … |
|
| 43. |
What is coupling reaction? how is it useful in metallurgy? |
|
Answer» __]▄▀▄▀▄▀ıllıllıllıllıllıllı[ Your ANSWER ]ıllıllıllıllıllıllı╚» A CHEMICAL reaction having a commonintermediate in which ENERGY is transfered from one side of the reaction to the other. Examples: 1. The formation of ATP is endergonic and is coupled to the dissipation of a PROTON gradient. ▁ ▂ ▄ ▅ ▆ ▇ █ [ Hᴏᴘᴇ HELP You Dear ] █ ▇ ▆ ▅ ▄ ▂ ▁ |
|
| 44. |
What is vinegar?describe with a chemical equation... what happens when NaHCO3 react with ethanoic acid |
| Answer» MARK as BRAINLIEST | |
| 45. |
Compare all the proposed models of an atom given in this chapter.....Class9 ncert chapter4-Structure of the atom. |
| Answer» | |
| 46. |
Which of the following has higher dipole moment or |
|
Answer» ________________Which of the FOLLOWING has HIGHER DIPOLE MOMENT or✔✔✔_______________________ |
|
| 47. |
Which of the following salt will not be hydrolysed? , |
|
Answer» ________________Which of the FOLLOWING SALT will not be HYDROLYSED? , ✔✔✔_______________________ |
|
| 48. |
Which of the following processes are accompanied by increase of entropy ? (a) Stretching of rubber band. (b) Boiling of an egg. (c) A deodrant is sprayed. |
|
Answer» ________________Which of the FOLLOWING processes are ACCOMPANIED by increase of entropy ?(a) STRETCHING of rubber BAND.(b) Boiling of an EGG.(c) A deodrant is sprayed.✔✔✔_______________________ |
|
| 49. |
Which of the given species are isostructural species: , , , ? |
|
Answer» ________________No3_______________________ |
|
| 50. |
Which of the following conditions predict spontaneity: (a) ΔH = + ve, ΔS = – ve, high temperature (b) ΔH = – ve, ΔS = + ve, low temperature (c) ΔH = + ve, ΔS = + ve, high temperature (d) ΔH = –ve, ΔS = – ve, low temperature |
|
Answer» ________________Which of the FOLLOWING CONDITIONS predict spontaneity:(a) ΔH = + ve, ΔS = – ve, high temperature(B) ΔH = – ve, ΔS = + ve, LOW temperature(c) ΔH = + ve, ΔS = + ve, high temperature(d) ΔH = –ve, ΔS = – ve, low temperature(d) ΔH = –ve, ΔS = – ve, low temperatureWhich of the following conditions predict spontaneity: ΔH = –ve, ΔS = – ve, low temperature. _______________________ |
|