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. |
Two liquids have 350k and 375k respectively which has more greater intermolecular force of attraction |
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Answer» 2nd liquid with 375k has more GREATER INTERMOLECULAR SPACE |
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| 2. |
What is electronegativity |
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Answer» Hey!! |
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| 3. |
How does the water kept in an earthen pot become cool during summer |
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Answer» It is because In an earthen pot, watergets evaporated quickly through the pores.Cooling is caused by evaporation. Some heat ENERGY is UTILISED during the PROCESS of evaporation. ... therefore water kept inearthen pot become COOL during summer |
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| 4. |
Define kinetic energy |
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Answer» The ENERGY of PARTICLES with their MOVEMENT is CALLED KINETIC energy . |
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| 5. |
Coppersulphate reaction with zinc any color observation |
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Answer» Yes, when CuSO4 reacts with ZN, Zn DISPLACES Cu of Blue COLOURED CuSO4 solution to form colourless ZNSO4 solution |
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| 6. |
Dry hcl donot change colour of dry litmus give reason |
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Answer» HEY MATE here is your answer. |
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| 7. |
WHY JJ THOMSON THOUGHT that the particles coming from cathode are electrons but not atoms charged negatively. .Pls answer it correctly. |
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Answer» Explanation: We know that Same(like)(+,+ or -,-) charges repel each other while different(unlike)(+,-) attract each other. JJ Thomson found that the PATH through which the cathode ray TRAVELS bent towards a positive metal plate, while it moves (repel)away from a negative metal plate. So, this makes clear that the particles in the cathode ray were negatively charged. Experiments with the magnets also proved that the particles in the cathode ray had mass. One main reason was Photo-electric effect. It means , The phenomenon of EJECTION of electrons from the metal surface when light FALLS or strikes on it is called Photo-electric effect. Now, Due to the fact that those negatively charged particles CONTAINED mass and was a Sub-atomic particles which means a constituent of an atom itself so, Thomson thought it would be electrons and not the atoms. |
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| 8. |
Applications of chemical reactions in our daily life |
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Answer» Heya.!! |
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| 9. |
Which machine is used in recovering the grains from already cut crop |
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Answer» Thresher is the machine USED in recovering GRAINS from ALREADY cut crop...... Hope it may be helpful... |
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| 10. |
Nikhil took Zn, Al, Cu , mg and Na metal in cold water, hot water and also reacted with steama) name the metal which react with cold waterb) name the metal which react with hot waterc) which of the above metals react with steam |
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| 11. |
Write an activity to show that silver chloride decomposition reaction |
| Answer» SILVER chloride is a chemical compound with the chemical formula AgCl. This white CRYSTALLINE SOLID is well KNOWN for its low solubility in water (this behavior being reminiscent of the chlorides of Tl+ and Pb2+). Upon illumination or HEATING, silver chloride converts to silver (and chlorine), which is signaled by greyish or purplish coloration to some samples. AgCl occurs naturally as a mineral chlorargyrite. | |
| 12. |
How is bond order related with bond length? |
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| 13. |
What is kinetic theory of gases |
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Answer» Kinetic THEORY explains macroscopic PROPERTIES of GASES such as pressure,temperature,viscosity,thermal conductivity and volume by considering their Molecule COMPOSITION and motion it’s known as Brownian motion ,it result directly from collisions between the grains or PARTICLES and liquid molecules |
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| 14. |
What is Daniell Cell ? |
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Answer» A primary VOLTAIC cell with a copper ANODE and a zinc-amalgam cathode, giving a standard electromotive force when either copper sulphate or SULPHURIC acid is USED as the electrolyte |
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| 16. |
In which reaction does magnesium and ether both are used? |
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Answer» In GRIGNARD REACTION does MAGNESIUM and ETHER both are USED... |
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| 17. |
What is water cycle |
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Answer» The cycle of processes by which water circulates between the earth's oceans, atmosphere, and land, INVOLVING PRECIPITATION as rain and snow, drainage in STREAMS and RIVERS, and return to the atmosphere by EVAPORATION and transpiration. |
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| 18. |
What is redox reaction? When magnesium ribbon burns in the air and forms a white ash, is magnesium oxidized or reduced? |
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Answer» The reaction in which oxidation as WELL as REDUCTION takes place simultaneously is CALLED redox reaction. |
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| 19. |
Give the influence of temperature and pressure on the solubility of gases in water |
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Answer» With INCREASES I TEMP solubility decreases but increases with INCREASE in PRESSURE |
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| 20. |
Can a solid directly be converted into the gaseous state? GIVE AN EXAMPLE |
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Answer» YES,a solid can INDEED be CONVERTED directly into gaseous state without coming to liquid state.This process is called sublimation.For eg:-camphor. Hope this HELPS buddy!!! Plz MARK as brainliest.. |
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| 21. |
Names of any two substances which sublime?? |
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Answer» 1.camphor |
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| 22. |
What is the physical state of water at 100 degree celsius |
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| 23. |
X + Pb gives PbCl2 + Cu what is X ? |
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Answer» Your ANSWER |
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| 24. |
Give three factors which affect the solubility of a solid solute in a solvent. |
| Answer» TEMPERATURE, PRESSURE | |
| 25. |
Why does carbondioxide turns lime water milk y? |
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Answer» HEYA HERE is your answer CO2 turns lime water MILKY because of the formation of INSOLUBLE CACO3. Cao + CO2 - - CaCO3 |
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| 26. |
why is it advised not to wear synthetic clothes while working in a laboratory or working with fire in the kitchen |
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| 27. |
Give the basicity of : hno3 ,h2so4,phosphoric acid |
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Answer» The BASICITY of HNO3= 1 |
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| 28. |
Who first tabulate the first modern periodic table |
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| 29. |
How can we obtain different gases from air |
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Answer» Because there are MANY gases mix in air you can OBTAIN the different gas like a you TAKE OXYGEN and tree take carbon dioxide |
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| 30. |
When x molecules are removed from 200mg of N2O 2.89*10(-3)moles are left then x will be |
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Answer» 1mg = 10^-3 g then , |
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| 31. |
liquids generally have lower density as compared to solids.But you must have observed that ice floats on water. find out why. |
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Answer» When WATER turns into ice it forms a cage like structure which is why the volume increases. |
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| 32. |
How to balance calcium hydroxide and nitric acid gives calcium nitrate + water? |
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Answer» CA(OH)2 +2HNO3--------ca(no3)2 +2h2o Explanation: |
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| 33. |
Why does the flow of acid rain in river make the survival of aquatic life in the river difficult |
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Answer» Hey mate! |
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| 34. |
A mg wire is burnt in air...what type of chemical reaction |
| Answer» COMBINATION reaction TAKES PLACE in burning of magnesium | |
| 35. |
Name two factors which influence the state of matter |
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Answer» That's your answer:- |
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| 36. |
10 examples of neutralisation reaction of class 7 |
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Answer» 1. H_2SO_4 + 2KOH -> K_2SO_4 + 2H_2O 2.NaOH (AQ) + HCL (aq) –> NaCl (aq) + H2O (liq) 3.Ca(OH)2 (aq) + H2SO4 (aq) –> CaSO4 (s) + H2O 4.Ca(OH)2 + H2CO3 --> CaCO3 + 2 HOH 5. HCl + NaOH --> NaCl + HOH 6. H2SO4 + 2 NH4OH --> (NH4)2SO4 + 2 HOH 7. 2 NaOH + H2CO3 --> N2CO3 + 2 NaOH 8. Mg(OH)2 + HCl --> MgCl2 + HOH 9. SO2 + HOH --> H2SO3 10. 2 NO2 + HOH --> HNO2 + HNO3 11. Cl2 + HOH --> HCLO + HCl |
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| 37. |
Mention the physical qualities and the manner in which these need to be altered for liquefy ingredients gases |
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Answer» Temperature and PRESSURE are the physical QUANTITIES needed for liquefying gases. |
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| 38. |
What happens chemically when quicklime is added to water filled in a bucket |
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Answer» When QUICK lime REACTS with WATER calcium HYDROXIDE is formed !! |
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| 39. |
an atom of an element has fourth shell as the valence shell. thr difference between electrons present in l- and m-,k-,and n- shells are 1 and 0, respectively. find the atomic number of an element |
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Answer» Lithium and ATOMIC no is 3 in L and m shells |
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| 40. |
Rusting of iron is a chemical change but magnetization of iron is a physical change.GIVE REASONS! |
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Answer» One simple REASON is that once if IRON gets rusted we can't get it BACK to iron. But if iron is magnetised it slowly loses its MAGNETIC field and BECOMES again iron |
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| 41. |
Differentiate between Homogeneous and heterogeneous mixture. |
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Answer» The difference between heterogeneous and HOMOGENEOUS MIXTURES is the degree at which the MATERIALS are mixed together and the UNIFORMITY of their COMPOSITION. |
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| 42. |
Are olfactory indicators natural indicators? Or are they synthetic indicators? |
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Answer» OLFACTORY indicators are NATURAL indicators. As we use natural PRODUCTS like RED cabbage, onion and so on... Hope it helps!!!!!!! |
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| 43. |
Why can't we cut a stream of water easily? |
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| 44. |
During electrolysis of water a few drops of sulphuric acid are added |
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Answer» Electrolysis of PURE WATER is very lowbecause water is an covalent compound so it can't ionize to releaseions. To INCREASE the conductivity of water a few drops of sulphuricacid is added .Being a strong acid it can ionize completely to release H+ ions. These H+ ions are responsible for the CONDUCTION of electricity. |
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| 45. |
Elements are classifiedas metals, non metals and metalloids. Give any one property of reach also give one example of each |
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Answer» METALS can EASILY LOSE their electrons...eg: potassium,SODIUM,lithium etc. non metals can easily GAIN electrons...eg: chlorine,fluorine,iodine etc. metalloids can both lose and gain electrons....eg: boron,germanium,tellurium etc. |
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| 46. |
Chemistry project for 2 on drugs and its classification |
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Answer» Drugs are prescribed by physicians for the PREVENTION ortreatment of DISEASES, ... CREATE curiosity forhaving a personal EXPERIENCE of the drugs.2. .... us this opportunity to make a projecton“Drugs and its Classification” |
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| 47. |
What is the difference between boilingpoint and melting point |
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Answer» Boiling POINT described as the MAXIMUM temperature at which a substance start to boil WHEREAS Melting point described as the MINIMUM temperature at which a substance start to melt........... |
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| 48. |
CaCo3 decmposes to give CaO and CO2 if the masses of CaO and CO2 produced are 5.6 g and 4.4 g respectively by heating 12 g of an impure CaCO3 sample then the %of imprity sample will be |
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Answer» HEY MATE here is your answer. hope it HELPS you. |
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