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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. |
Explain the first law of thermodynamics? |
| Answer» The total energy of an isolated system remains constant. | |
| 2. |
Narrate a success story of the athlete. |
| Answer» | |
| 3. |
Why water has maximum density at 273k. |
| Answer» Water has maxx. density at 277K .because its volume decrease when heat is given to water at 273k and due to this the H-bond break & its volume decrease | |
| 4. |
Balance oxidation in acidic medium any 5 |
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| 5. |
Oxidation and reduction go side by side in a redox reaction. Justify it. |
| Answer» In a reaction any element can never be oxidised without reducing other element So both oxidation & reduction occur simultaneously So they go side by side in a reaction | |
| 6. |
Can the same element have different oxidation numbers in different compounds? Justify. |
| Answer» oxidation number(oxidation state) is number assigned to atom, ion or compound which represent electron gain or lost by atom, ion or compound. Some element have more than one oxidation number, because they act differently when they combine with other element. | |
| 7. |
What is the lewis dot structure of N2O4 and N2O3 |
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| 8. |
What is electron cloud ? |
| Answer» The term\xa0electron\xa0cloud is used to describe the area around an atomic nucleus where an electron will probably be. It is also described as the "fuzzy"\xa0orbit\xa0of an moving electron | |
| 9. |
A substance which is 2 kg when it is dry ,1 kg when it is wet and 3 kg after burning |
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Answer» Sulphur Any solid thing that burnt and sink |
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| 10. |
S I unit of density |
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Answer» kilogram meter per cube Kgmper metre cube |
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| 11. |
What is redox half reaction? |
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| 12. |
What is ionisation enthalpy |
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| 13. |
What is oxidizing agent? |
| Answer» The substance in a chemical reaction which gets reduced and thus helps in oxidation is called an oxidizing agent. | |
| 14. |
What is oxidizing age |
| Answer» | |
| 15. |
Why the pH of our blood remains almost constant at 7.4 through we quite often eat spicy food |
| Answer» Because our blood is a Buffer solution. | |
| 16. |
Which book is better for read in class11? |
| Answer» i think pardeep better for student of class 11th | |
| 17. |
SIR I NEED YOUR HELP CAUSE OF I FOUND MISTAKE IN YOUR APP |
| Answer» | |
| 18. |
What. is different between valency and oxidation number |
| Answer» \tOxidation numberValencyOxidation number is the charge (real or imaginary) present on the atom of the element when it is in combination. It may have plus or minus sign.It is the combining capacity of the element. No plus or minus sign is attached to it.Oxidation number of an element may have different values. It depends on the nature of compound in which it is present.Valency of an element is usually fixed.Oxidation number of the element may be a whole number or fractional.Valency is always a whole number.Oxidation number of the element may be zero.Valency of the element is never zero except of noble gases.\t | |
| 19. |
Why diffusion in liquid is different from gases |
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| 20. |
Difference between chain isomerism and positional isomerism ? |
| Answer» \tChain isomerism relates to molecules with the same molecular formula but different carbon skeleton.\tPositional isomerism relates to molecules with the same carbon skeleton but functional groups in different positions. | |
| 21. |
What is logarithms???? |
| Answer» A logarithm is the power to which a number must be raised in order to get some other number .For example, the base ten logarithm of 100 is 2, because ten raised to the power of two is 100: log 100 = 2. | |
| 22. |
Calculate the number of molecules present in 34.2g of cane sugar (C12H22O11 |
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Answer» Calculate the mass number of cane sugar and then Put the concept Given mass by Molar mass. (mass number) Mass number =342Given mass. =34.2Now34.2÷342= .1 0.1 |
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| 23. |
Explain de broglie wave law |
| Answer» \xa0Lewis de-Broglie proposed that matter has dual characteristic just like radiation. His concept about the dual nature of matter was based on the following observations:-(a) The whole universe is composed of matter and electromagnetic radiations. Since both are forms of energy so can be transformed into each other.(b) The matter loves symmetry. As the radiation has dual nature, matter should also possess dual character.According to the de Broglie concept of matter waves, the matter has dual nature. It means when the matter is moving it shows the wave properties (like interference, diffraction etc.) are associated with it and when it is in the state of rest then it shows particle properties.Thus the matter has dual nature. The waves associated with moving particles are matter waves or de-Broglie waves.WAVELENGTH OF DE-BROGLIE WAVES Consider a photon whose energy is given by E=hυ=hc/λ – – (1)\xa0If a photon possesses mass (rest mass is zero), then according to the theory of relatively ,its energy is given by E=mc2 – – (2)From (1) and (2) ,we have Mass of photon m= h/cλ Therefore Momentum of photon P=mc=hc/cλ=h/λ – – (3)Orλ = h/p If instead of a photon, we consider a material particle of mass m moving with velocity v,then the momentum of the particle ,p=mv. Therefore, the wavelength of the wave associated with this moving particle is given by: h/mv – Or λ = h/p (But here p = mv) .(4) This wavelength is called DE-Broglie wavelength | |
| 24. |
Why are alkali metals strong reducing agent? |
| Answer» By H+ ions | |
| 25. |
What is the radius of carbon |
| Answer» Atomic radius is 70pm | |
| 26. |
Explain oxidation numbers |
| Answer» An oxidation number is a number that is assigned to an atom in a substance. The oxidation number could be positive, negative, or zero, and it indicates if electrons are lost or gained.In other words, the oxidation number is a number that helps us keep track of electrons in an atom.Here, the oxidation number of calcium is +2 and the oxidation number of oxygen is -2.If the oxidation number is positive, then this means that the atom loses electrons, and if it is negative, it means the atom gains electrons. If it is zero, then the atom neither gains nor loses electrons. | |
| 27. |
How to draw the diagram of the symbolic representation of the cell?? |
| Answer» | |
| 28. |
What is polarising energy? |
| Answer» | |
| 29. |
Ethail-butenoate compos |
| Answer» | |
| 30. |
Ethail-butenoate |
| Answer» | |
| 31. |
2-ethoksi propen |
| Answer» | |
| 32. |
ઈથાઈલ-બયુટેનોઅટ બંધારણ |
| Answer» | |
| 33. |
What is the oxidation no. Of Oxygen in Ca2O ..??? |
| Answer» Ca2Ox -22(x)+(-2)=02x-2=0x=2÷2x=1 | |
| 34. |
What is electron rich compound ? |
| Answer» | |
| 35. |
Calculate the formal charge on atom in carbonate ion |
| Answer» | |
| 36. |
Diethyle ether |
| Answer» | |
| 37. |
Find the vloume ofHcl required to complety nutralized 4g10ml of NaOH normality of Cl is 0.1 |
| Answer» | |
| 38. |
What will happen if two different alkyl halides are taken in wurtz reaction. |
| Answer» | |
| 39. |
The volume of given mass of gas is 0.6 DM square at apressu |
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| 40. |
Partial ionic character of covalent bonds |
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| 41. |
MCW type |
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| 42. |
What is the difference bw bond energy and bond dissociation enthalpy |
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| 43. |
With the help of Le-Chatelier\'s principle why clothes dry quickly on a windy day?? |
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| 44. |
With the he |
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| 45. |
Define octet rule in 1 mark define |
| Answer» Octet rule- according to this every element can have or take to have 8electrons in there outermost shell | |
| 46. |
How many electrons will be present in the sub-shells having ms value -1/2 for n=4? |
| Answer» 16 | |
| 47. |
What is auto protolysis of water |
| Answer» In\xa0autoprotolysis\xa0a proton is transferred between two identical molecules, one of which acts as a Brønsted acid, releasing a proton which is accepted by the other molecule acting as a Brønsted base. For example,\xa0water\xa0undergoes\xa0autoprotolysisin the self-ionization of\xa0water\xa0reaction. | |
| 48. |
Chemical properties of calcium carbonate |
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| 49. |
In balmer series of hydrogen atom spectrum which electron transition cause third line.? |
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| 50. |
Why we study hydrogen |
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