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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. |
Is deltaH or deltaS the sole criterion for spontaneity |
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| 2. |
What is actually disproportionation reaction? How to find a reaction is disproportionate? |
| Answer» Disproportion reaction is a specific type of reaction in which an element undergoes both oxidation and reduction in same reaction. Note all the oxidation number of elements in a reaction if an element in reactant oxidised and reduced in the product then it is | |
| 3. |
Why bond angle of H2O\xa0is larger than that of H2S?\xa0 |
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| 4. |
Gfkj |
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| 5. |
Electron affinity of chlorine is greater than fluorine why |
| Answer» Becoz while moving down the gp electro affinity decrease due to increase in size | |
| 6. |
How can the reactivity of a Ag+ can be found |
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| 7. |
Molecular orbital theory for oxygen and nitrogen |
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| 8. |
What is the relation between electronegetivity and oxidizing property of elements? |
| Answer» Electronegative increase left to right in period but oxidizing property decrease in period when we move left to right . | |
| 9. |
Representating elements is their consistent decrease in atomic radius as the atomic number increases |
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| 10. |
how viscosity decrease |
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Answer» if the intermolecular force is very weakbetween the particles If the intermolecular forces are tooo strong like honey |
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| 11. |
Why are Alkali metals used in photo electric cells?? |
| Answer» Alkali metals are used in photoelectric cells because of their low ionization energies, they lose electron very easily on a irradiation. | |
| 12. |
What is a limiting reagent? |
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Answer» The reactants which is present in lesser amount gets consumed , limits the amount of product formed and is called limiting reagent The part of equation which prevents any reaction to get excessive or which limits any reaction |
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| 13. |
Formation of mlecular orbitals linear combination of atomuc orbitals.....????? |
| Answer» ?????????????????????????????????????????? ??????????????????????????????? | |
| 14. |
Importance of vsper |
| Answer» Which determines the geometry and shape of the molecules | |
| 15. |
First line transition of hydrogen in layman series |
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| 16. |
Planks constant value?? |
| Answer» \xa0In SI Units the Plank\'s constant is about 6.62606×10−34 J. | |
| 17. |
Define mass storage of glucose |
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| 18. |
Mass storage of glucose |
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| 19. |
Why for isothermal process U is zero ? |
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| 20. |
what is law of partial pressure |
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Answer» Daltons law of partial pressure - The total pressure exerted by a mixture of two or more non reactive gases in a definite volume is equal to the sum of the individual pressure which each gas would exert if it occupies the same volume alone at a constant temperature. Law of partial pressure was given by Dalton it used to determine the individual pressure of each gases in a mixture of gases |
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| 21. |
law of partial pressure |
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| 22. |
Law of definite proportion |
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| 23. |
State law of definite proportion |
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| 24. |
What is difference between emprical and molecular formula |
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Answer» Empirical formula of chemical compound shows the simplest positive integer ratio of atoms of each element present in compound. Molecular formula of compound also known as chemical formula is the way of expressing the amount atom that each element has in that particular compound. Empirical formula is the simplest formula for a compound .A molecular formula is same as or a multiple of empirical formula and is based on actual number of atoms of each type in the compound. |
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| 25. |
spin quantum no.? |
| Answer» It is just arbitrarily assumed | |
| 26. |
Why N2 has large bond length than N2+ |
| Answer» N2 has more electrons | |
| 27. |
Determine the empirical formula of an oxide of iron which has 69.9℅ iron and 30.1℅ dioxygen by mass. |
| Answer» Iron:% by mass= 69.9Atomic mass= 55.85Moles of element( relative no. of moles)= 69.9/55.85 = 1.25Simplest molar ratio = 1.25/1.25 = 1Simplest whole no. molar ratio= 2Oxygen:% by mass = 30.1Atomic mass = 16.00Moles of element =30.1/16.00 = 1.88Simplest molar ratio = 1.88/1.25 = 1.5Simplest whole no. molar ratio = 3Fe2O3 | |
| 28. |
What is ionisation enthalpy of N & O |
| Answer» | |
| 29. |
Atomic size of oxygen is bigger than nitrogen. Why? |
| Answer» As oxygen has more number of electrons | |
| 30. |
Oxidizing agent? |
| Answer» Oxygen | |
| 31. |
Valence bond theory? |
| Answer» it is used to explain chemical bonding. 2 atoms that have unpaired electron in the orbital can overlap to give rise to a chemical bond. | |
| 32. |
What is the number of waves in nth orbit? |
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Answer» Correct No. Of waves = 2πr/λ |
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| 33. |
BrF3 shape off according to vsepr |
| Answer» Geometry - Triangular BipyramidalShape - \'T\' Shape | |
| 34. |
What is delta bond |
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Answer» I mistaken i write pi bond, delta bond is formed by overlapping of all four lobes of d orbital Bond formed by sidewise overlapping of orbitals |
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| 35. |
What is Zeeman effect and stark effect? |
| Answer» The splitting of spectral lines in magnetic and electric field respectively is known as zeeman and stark effect | |
| 36. |
Why during combustion oxygen is taken in excess?????????? |
| Answer» oxygen is used in excess for complete combustion. otherwisec it will incomlete combustion leadind to the formation of carbon mono oxide and dense black fumes\xa0 | |
| 37. |
What is laminar flow |
| Answer» It is regular degradation of velocity | |
| 38. |
What is nodal plane? |
| Answer» The plane where probability of finding an electron is zero. | |
| 39. |
Drawbacks of Bohr atomic model. |
| Answer» 1. Bohr treated electrons as particles where according to de Broglie\'s hypothesis, having a very low mass, electron also exhibits wave nature.2. Bohr\'s model was adequate only for nucleus having only one electron e.g. Hydrogen, He+1, Li+2 etc. Bohr\'s model could not explain the spectra of multi-electronic atoms.3. Bohr\'s model was two-dimensional where an atom is three-dimensional.4. Using a better spectrometer, the spectra showed very fine lines. Bohr\'s model could not explain the origin of those fine lines. (Solved by Arthur Sommerfield who imagined electrons orbiting in different planes and having elliptical orbits.)5. Bohr\'s model could not explain the effect electric field and magnetic field on spectra. (Stark effect and Zeeman effect)6. In Bohr\'s equation, the momentum and position of electron, revolving around the nucleus were well defined. But, according, Heisenberg\'s Uncertainty principle, it is impossible to measure the position and momentum of electrons precisely. If the position is measure with maximum precision, there will be uncertainty in the value of momentum and vice versa. | |
| 40. |
Chemical families |
| Answer» | |
| 41. |
Why energy of electron is always negative? |
| Answer» Let me explain you in the simplest manner.For a two object system,If they\xa0repel each other\xa0when you move them towards each other, that means it takes work to do this, and the potential energy is\xa0positive.If they\xa0attract each other\xa0when you move them towards each other, then\xa0potential energy\xa0of the two object system goes on\xa0decreasing.Potential energy of a two charged object system at a particular orientation is defined as work done by external agent to bring the second body from infinity to desired point in presence of the field created by the first body. Now think the first body to be nucleus and the second body to be electron. Now to find the potential energy, according to potential energy defination I just said above, we need to being the electron from infinity to any desired location, lets say to a distance of "x" from the nucleus. As we have to bring electron from infinite that means initially electron is infinitely far away from nucleus and hence at zero potential.Potential Energy of electron:When we are bring the electron towards the nucleus, offcourse they are going to attract each other and as said earlier if two objects attract each other, then potential energy of the system goes on decreasing. So as we move electron towards the nucleus, energy goes on decreasing. Note that\xa0initially as electrons and nucleus were at infinite distance from one another, hence initially at zero potential and any further decrease in potential energy implies negative potential energy.\xa0So potential energy of the electron is negative inside any atom.Kinetic Energy of electron:The electron also has kinetic energy. Kinetic energy can never be negative (because in K.E expression we have squared of velocity which is always positive) and it is smaller in magnitude than the potential energy.Total Energy of electron:So the total energy i.e kinetic energy + potential energy is negative | |
| 42. |
Find bond order in N2 |
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Answer» One sigma bond and two pi bond no of bond order 3 One sigma bond and two pi bond in N2 There are 3 bonds in N2 |
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| 43. |
What is surface tension explain with five example |
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| 44. |
What is the hybridization of NO2 |
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| 45. |
Sir I want to know some easier method to make my chemistry study |
| Answer» Relate chemistry to your daily life | |
| 46. |
What is resonance structure? |
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Answer» When the molecular structure of a molecule exist in more than one form then it is resonance structure you can take simple example of benzene ring c6h6 it exists in two molecular structure (position of double bond change) then final structure of benzene is a circle in middle of ring called resonant structure of benzene The compounds which can be represented in different structures |
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| 47. |
Pcl5 can exist but Ncl5 cannot exist why |
| Answer» By electronic configuration of p you get 3p3 in last it is its ground state but in excited state a 3d orbital generated and 1 electron from 3s2 shifts from it 3d so it has 5 valency | |
| 48. |
Why Hund rule is said to be the law of maximum multiplicity |
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| 49. |
What is the difference between oxidation number and valency |
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Answer» Valency is the ability to make bonds,valence electrons are the electrons that participate in forming chemical bonds. For exampleCarbon has a total of 6 electrons . However, 2 of those electrons are in the core of the atom ( in the 1s orbital). The remaining 4 electrons are in the outer 2s and 2p orbitals. Since these 4 electrons are in the outer shell, they can participate in bonding so\xa0carbon has a valency of 4.Oxidation number is a number used to designate how oxidized an atom is in a compound or molecule. It is the hypothetical charge an atom would have if all of its bonds were completely ionic (rather than covalent). Really oxidation state is that allows us to track what is being oxidized or reduced in a chemical reaction by comparing the oxidation states of the reactants to those of the products.\xa0 Oxidation number is the value of electron which is either gain or loss from an atom whereas valency is the capacity of atom to gain or loss electron to get stable |
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| 50. |
Full from of bod |
| Answer» Biochemical oxygen demand | |