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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. |
Oxygen has less negative electron gain enthalpy than sulphur.give reason |
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| 2. |
What is your next paper friends |
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Answer» Biology... Chemistry |
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| 3. |
Why magnessium does not impartcolour to the flame while calcium does |
| Answer» Magnesium do not impart colour to the Bunsen flame because their atoms are comparatively smaller and the valance electrons are strongly attached to the nucleus. Therefore their ionisation energies are high, so they need large amount of energy for the excitation of their valence electrons to higher energy level which is usually not available in the Bunsen flame. So they do not impart any colour to the flame. | |
| 4. |
How many of you think you can get above 90%in 11 class.? |
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Answer» CLass 11 doesnt matters 80% ke above to score aa sakta he but 90% above is something difficult ....??? What about you ??? Do you think to score above 90 % .. ?? Impossible? |
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| 5. |
What is the ratio of mass of three isotopes of hydrogen |
| Answer» 1:2:3as mass of protium is 1Deutrium is 2 amd tritium is 3 | |
| 6. |
How to define stability of campound |
| Answer» If a compound has least energy with very less chances to react with any other compound and also having least repulsion and long bond length then a compound is said to stable | |
| 7. |
Draw resonance structure of HCO3- |
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| 8. |
Difference between Duma\'s and Kjeldahl\'s method |
| Answer» The Kjeldahl method uses concentrated sulfuric acid and a catalyst for digestion of samples. As the Dumas method determines total Nitrogen including inorganic fractions like nitrite and nitrate and the Kjeldahl method only organic nitrogen and ammonia, differences in results occurred in the comparative studies. | |
| 9. |
Why SiCl4 can be easily hydrolyzed but CCl4 cannot be hydrolyzed easily? Explain with example |
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| 10. |
Why KO2 is paramagnetic in nature? |
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Answer» KO2\xa0is a superoxide in which, only one electron is released from the dioxygen atom and a superoxide ion is represented as O2-\xa0. So, in\xa0KO2\xa0the oxygen atoms bear -1/2 oxidation state and they also behave as a\xa0free radical species, having an\xa0unpaired electron.We know that a molecule becomes paramagnetic due to the presence of unpaired electrons. Hence,\xa0KO2\xa0behaves as paramagnetic molecule. KO2 means K+O2-here O2- is paramagnetic .according to molecular orbital theory O2- has one antibonding orbital is partial fill.i.e 1sigma s^2 , 1sigma*s^2,2sigma s^2,2sigma*s^2, 2sigma. px^2, pi 2py^2=pi2pz^2, pi*2py^2=pi*2pz^1we show last in configuration of O2- has partially filled so KO2 is paramagnetic. |
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| 11. |
Why aquatic animals can not live in hot and cold season |
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| 12. |
Oxidation number calculation of d block elements |
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| 13. |
Electronegativity define |
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| 14. |
Classify the following as being either a p type or n type semiconductor when B doped with Si |
| Answer» P-type semiconductor | |
| 15. |
Al3 ion is much more atable than tl3 ion |
| Answer» Al-oxidation state 3,Tl-oxidation state 1 | |
| 16. |
Find the oxidation state of o2 |
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Answer» 1 0 0 |
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| 17. |
Redox reaction ka balance |
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Answer» Ha Acidic or basic medium ? |
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| 18. |
Give an example of basic buffer |
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Answer» NH4OH + NH4cl CH3COONa |
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| 19. |
Cylic process mai kya kya zero hota hai |
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Answer» Internal energy is zero means delta u is zero and delta q = delta w Δq =0 |
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| 20. |
Marks from organic |
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| 21. |
Calculate moles of hydrogen and carbon in three moles of ethane |
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| 22. |
Among 2nd period elements actual ionisation enthalpy Ii |
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| 23. |
Difference between photon proton and quantum |
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| 24. |
A sample of NaNO3 weighing 0.83 g is placed in 50 ml volumetric flask |
| Answer» The flask is then filled with water to the mark n neck what is the molarity of solution | |
| 25. |
Calculate the molarity of water if density is 1000 kg/m3 |
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| 26. |
Write the iupac name of CHOCOOH |
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Answer» You can name it as formylethanoic acid based on the priority of the functional groups...? ??? |
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| 27. |
Write vander waals equation for 1 mole of real gas |
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Answer» Thnks chore (P - n^2b^2/V^2 ) ( V - n^2a^2) = RT |
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| 28. |
Diffrence between conduction and valence band |
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| 29. |
For an isolated system internal energy change is zero than what will be change in ?S |
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| 30. |
What is the name of the compound formed when CO combines with blood |
| Answer» Corboxyheamoglobin | |
| 31. |
What is dipole moment ? Write it in mathematical expression . |
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Answer» Mathematically it is written asq × d It is the magnitude of charge and distance between the bonded atoms. |
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| 32. |
Give the conditions for maximam deviation of real gas from ideal behavier. |
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| 33. |
Balance chemical equation by oxidation number methodP4+oh^-=Ph3+H2o2 |
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| 34. |
How many d electrons are present in Cricket 3+ |
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| 35. |
How to made the results of class 11 |
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| 36. |
why dissolution of ammonium chloride im water is an endothermic process |
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| 37. |
Write conjugated acid and conjugated base both for h2o and nh3 |
| Answer» Oh- and nh2- are conjugate base and h30+ and nh4+ are conjugate acid. | |
| 38. |
Easy Chapter Of chemistry |
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Answer» Organic chemistry and p Block plus Equilibrium kar lo Pass Toh ho hi gaonge How I Score passing marks But 1 day M ye sab Kyse finish kro Environmental chemistry,redox reactions,hydrogen,s block Ch-1, redox, ch-3 |
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| 39. |
Why CCl4 is not hydrolysed but SiCl4 can be hydrolysed? |
| Answer» In ccl4 carbon does not have vaccant d sub shell to gain e- where as in sicl4 si have vaccant d sub shell to gain e- during hydrolysis | |
| 40. |
Out of BF3,BCl3,BBr3 which is strongest Lewis acid and why? |
| Answer» With increase in size extent of overlapping decreases.... Due to decreases extent of overlapping, the species become more electron deficient. More Electron deficient species gain electron easily and so the order is:-)BBr3>BCl3>BF3 | |
| 41. |
At what temp., density of water is maximum and why |
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Answer» The initial temp we give is Used to break the Hydrogen bonding in Ice and hence at 4 Degree all the hydrogen bonds have broken so water has max density at 4 degree after that density decreases When the ice melts to liquid water, the structure collapses and the density of the liquid increases. At temperatures well above freezing, the molecules move faster and get further apart. The density decreases as temperature increases. ... Thus, the density of water is a maximum at 4 °C...... And reason ? 4 degree Celsius |
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| 42. |
List two factors which effect ionisation energy |
| Answer» Ionization energy depend on....Size- As the size increases I.E. decreasesNuclear charge--As nuclear charge increases I.E. increases | |
| 43. |
CO2 is a gas but SiO2 is solid at room temperature. Why? |
| Answer» Co2 consits of induvidual molecule with one central carbon atom double bounded to 2 oxygen. Co2 is gas but SiO2 is in giant molecular stucture but Co2 is simple molecular structure. | |
| 44. |
How is green chemistry has helped in the dry cleaning of cloths and laundry? |
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| 45. |
What type of isomerism shown by pentane and 2 methylebutane |
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Answer» Cis ya trans Chain |
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| 46. |
Gay Lussac\'s law? |
| Answer» at constant pressure and no of moles volume is directly proportional to temperatures. | |
| 47. |
Boyle\'s law? |
| Answer» at constant temperatures and no of moles pressure is inversely proportional to volume. | |
| 48. |
Louis symbol? |
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Answer» The pattern of bond pair and lone pair to represent the valence electrons by dot structure. |
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| 49. |
Molecular structure?? |
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| 50. |
Chemical bonding!!?? |
| Answer» the force of attraction which holds the constituents together in a molecule. | |