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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 will have maximum and minimum negative electron gain enthalpy among P, S, cl and F |
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| 2. |
how can I easily study equilibrium |
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| 3. |
My name is chotu |
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Answer» Absolutely right So what?? Mujhe log gavar or nassu bulate h Me pagal hu |
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| 4. |
Give example of three triatomic molecules |
| Answer» O3 Co2 H2o | |
| 5. |
College me bhi hindi milti hai kya PCM stream student ko? |
| Answer» No brthr... | |
| 6. |
Someone please tell Weightage of numerical in annual exm ???? |
| Answer» Kv school | |
| 7. |
nH3 is more basic than PH3 |
| Answer» Basically NH₃ is a base due to the lone pair of electrons present on the Nitrogen atom which is available for donation. On the other hand PH₃ is also a base but its basic character is less than that of NH₃ because the nitrogen in phosphorous have lone pair of electrons that are not readily available for donation.Also the P-H bonds are weaker than N-H bonds, so there’s not as much compensation for protonating PH₃. This is a result of the inert pair effect, seen in heavier elements. | |
| 8. |
Write notes on Boyle laws |
| Answer» \tBoyle’s law was stated by Robert Boyle.\tIt states that at constanttemperature, the pressure of a fixednumber of moles nof gasvaries inversely with its volume.\tp ∞ 1/v\\\tp = k1 1/vk1 = Proportionality constant. | |
| 9. |
Preparation of acidity in tea class 11th project |
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| 10. |
Confirmation of butane |
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| 11. |
Explain Gibbs free energy,entropy & spontaneity |
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| 12. |
Anions are bigger in size than their parent atom why?. |
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Answer» It follow fajan\'s rule Fajan rule Because addition of one or more electrons would result in increased repulsion among the electrons. |
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| 13. |
BF3 react with ammonia |
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| 14. |
How can you determine the density and molar mass of a gaseous substance |
| Answer» Density and Molar Mass of a Gaseous Substance\tAs per ideal gas equation,pV = nRTOr n/V = p/RT\tAs we know n = Mass of Gas (m) / Molar Mass of Gas (M) = m/MSo, m/MV = p/RTd/M=\xa0p/RT\tOr Molar mass = M = dRT/p | |
| 15. |
Give examle of wortz reaction |
| Answer» The reaction in which alkyl halides on treatment with sodium metal in dry ethereal (free from moisture) solution give higher alkanes is known as Wurtz reaction and is used for the preparation of higher alkanes containing even number of carbon atoms.Example:Methyl bromide on treating with sodium metal in dry ethereal solution gives ethane. | |
| 16. |
Define Adiabatic process |
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Answer» Delta h=0 Such a process in which matter can be exchange but there will be no exchange of heat between two systems. |
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| 17. |
Convert 3 ethyl 3 ene to prpanal and penptne 3 one |
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| 18. |
Which book should i take for 12th PCM |
| Answer» Resnick Halliday, PMorris and Bird,CEngineering Mathematics. | |
| 19. |
Why H2S exist in gaseous state whereas H2O remain in liquid state at room temperature |
| Answer» Due to strong hydrogen bonding in H2O than in H2S | |
| 20. |
How to find oxidation no. By structure |
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Answer» What does it mean to say???? Hloo Take unknown elements oxidation no as x and solve the problem |
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| 21. |
How it can be find out the no. Of hydrogen bonded water molecules are present in CuSO4.5H2O |
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| 22. |
what is BHC ? state it\'s uses ? |
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| 23. |
What is the preparation method of sodium carbonate (washing soda) with reactions? |
| Answer» Preparation :When we heat baking soda then hydrogen gas released and sodium carbonate left.When water is added to sodium carbonate then it becomes washing soda.Equation :2Nahco3 = Na2CO3 +h2O+co2Na2CO3 +10h2O =Na2CO3.10H2O | |
| 24. |
Prove that :-?h=?U+P?V |
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| 25. |
Effect of temperature on G(gibbs) |
| Answer» As gibbs free energy is equal to Enthalapy - temperature multiplied by entropy therefore if we increase the temperature value of gibbs free energy decreases or becomes negative or in simpler terms the reactions move towards spontaneity | |
| 26. |
Types of salt |
| Answer» Salts can be classified into the following types:a) Normal saltA salt that does not contain any replaceable hydrogen ions is a normal salt. It is obtained by replacing all the hydrogen ions of an acid by metal ions or ammonium ions. Examples: NaCl, Na2SO4, Na3PO4, NH4Cl, K2CO3, CuSO4\xa0etc.b) Bisalts or Acid saltsA bisalt, or an acid salt contains replaceable hydrogen ions in association with the acidic radicals. It is obtained by the incomplete replacement of hydrogen ions by metal ions or ammonium ions.Examples: NaHCO3, NaH2PO4\xa0and Na2HPO4.Since such salts also contain hydrogen ion, the term \'bi\' or acid can be substituted by hydrogen, e.g. sodium bicarbonate or sodium acid carbonate is also called sodium hydrogen carbonate.When bisalts or acid salts dissociate in water, they yield hydrogen or hydronium ions. | |
| 27. |
Very Important question of ch 1 and 2 |
| Answer» Rutherford model,Bohr model,Rutherford scattering experiment, Aufbau principl,difference between atomic & emission spectra.Numerical of molality, molarity, normality. | |
| 28. |
Electronic configuration of o2 |
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Answer» 1S2, 2S2 ,2P4 lectronic configuration of OxygenAtomic number of oxygen = 8.Therefore number of electrons = 8.Thus, electronic configuration of oxygen is\xa0Number of orbit in oxgyen = 2 O2 |
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| 29. |
Exams over ??? |
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Answer» No No |
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| 30. |
Write chemical equation for satzeff rule |
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| 31. |
Dedine P- Block element |
| Answer» P block elements are in which the last electron enters any of the three p-orbitals of their respective shells. Since a p-subshell has three degenerate p-orbitals each of which can accommodate two electrons therefore in all there are six groups of p-block elements.P block elements are shiny and usually a good conductor of electricity and heat as they have a tendency to lose an electron. You will find some amazing properties of elements in a P-block element like gallium. It’s a metal that can melt in the palm of your hand. Silicon is also one of the most important metalloids of the p-block group as it is an important component of glass. | |
| 32. |
Define MOT. |
| Answer» Molecular orbital (MO) theory is a method for describing the electronic structure of molecules using quantum mechanics. Electrons are not assigned to individual bonds between atoms, but are treated as moving under the influence of the nuclei in the whole molecule. | |
| 33. |
The approximate amount of benzene in 90% benzol is A . 40%B . 70%C . 65%D . 50% |
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| 34. |
If in a given chemical reaction, which one is said to be limiting reagent? |
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Answer» The substance or compound which gets used up completely in the reaction DescriptionThe limiting reagent (or limiting reactant or limiting agent) in a chemical reaction is the substance that is totally consumed when the chemical reaction is completed. The amount of product formed is limited by this reagent, since the reaction cannot continue without it. |
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| 35. |
Subject enrichment activity for xi |
| Answer» yes | |
| 36. |
Which of the following not an exothermic reaction |
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Answer» Abe options to de ? Where are the options?? |
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| 37. |
Dimensional Analysis ? |
| Answer» Ch1 physics?? | |
| 38. |
Among diamond and graphite which is thermodynamically more stable |
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Answer» Obviously, Graphite is thermodynamically more stable than diamond. Graphite is thermodynamically most stable state of carbon I think diamond becoz it requires more heat to be decomposed |
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| 39. |
How many cm are there in 1 inch?? |
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Answer» 1inch=2.5cm. 2.5 12 cm 1 inch =2.54 centimetres |
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| 40. |
Why does solubility of alkaline earth metal hydroxides in water increas down in group |
| Answer» Down the group,both lattice enthalpy as well as hydration enthalpy decreases.But the decrease in lattice enthalpy is rapid and hence "comparatively" hydration enthalpy will be greater.Therefore solubility increases | |
| 41. |
What is the hybridisation of P in PCl5? |
| Answer» Steric number of central atom phosphorus is 5. Therefore its hybridisation is sp3d or dsp3. | |
| 42. |
4 gm of NaOH is dissolved in 2 litre of Solution. Calculate its mass % by volume |
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| 43. |
Define mixture and two examples |
| Answer» A mixture is a combination of two or more substances (elements or compounds) which is not done chemically.Mixtures are two types Homogeneous Mixtures and Heterogeneous mixtures.Homogeneous Mixtures: A Homogeneous mixture has a uniform composition of its components throughout its mass. It does not have visible boundaries of separation between the various components. For example a sugar solution or a salt solution.Heterogeneous Mixtures: A Heterogeneous mixtures does not have a uniform composition throughout its mass also it has visible boundaries of separation between various components. For example mixture of sand and water. | |
| 44. |
Calculate the mass of 2×10^23 molecules of nitric acid |
| Answer» We know that,No. of moles =Total no. of molecules/Avogadro no.Therefore,no. of moles of nitric acid(HNO3)=2*10^23/6*10^23.=1/3 moles...(We have approximated 6.022*10^23 as 6*10^23 to solve the problem easily)Now,we know that no.of moles=given mass/molar mass Let x be the given mass of nitric acid.Molar mass of nitric acid=63Substituting the values,we get,1/3=x/63Therefore,x=21g | |
| 45. |
What is difference between electron and proton |
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Answer» Thanks \tElectronPhotonIt is matter.It is energy.It has mass.It has no mass.It carries a negative charge.It doesn’t carry any charge.The speed of an electron can be zero or anything under the speed of light. It is impossible for an electron to achieve the speed of light.Photon travels at the speed of light.\t |
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| 46. |
Write electronic configration of N2- . Number of electron is 15 here |
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| 47. |
What are the two differecce between 5.0g and 5.00g? |
| Answer» No difference | |
| 48. |
How is atmosphere related to kilopascal ? |
| Answer» The standard atmosphere is a unit to measure pressure, which is in turn measured in Pascals.i.e - 101325 Pa = 101.325 kPa.Here, Pa stands for Pascal and kPa stands for kilopascal. | |
| 49. |
Hydrated alumina is treated with aqueous NaoH solution |
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| 50. |
Calculate the mass percentage of methane |
| Answer» Please specify the element of which mass percentage is to be calculated. | |