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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. |
Practicas |
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| 2. |
What is le-chatelier principle |
| Answer» Change in any of the factors that determine the equilibrium conditions of a system will cause the system to change so as to reduce or counteract the effect of change | |
| 3. |
What is carious method? Explain |
| Answer» Definition of Carius method : a method for determining halogens, sulfur, and phosphorus in organic compounds by heating them in sealed glass tubes with fuming nitric acid in a special furnace, the glass tubes being enclosed in iron tubes to avoid danger from explosion | |
| 4. |
What is hydration enthalpy? |
| Answer» The energy realised when new bonds are made between the ions and water molecules is known as hydration enthalpy | |
| 5. |
Plzzz make me understand the 1st law of thermodynamics |
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Answer» \tThe First law of thermodynamics is same as law of conservation of energy.\tAccording to law of energy conservation: - Energy can neither be created nor be destroyed, only transformed to other forms.\tAccording to first law of thermodynamics:- The change in the internal energy of a closed system is equal to the amount of heat supplied to the system, minus the amount of work done by the system on its surroundings.\tExamples:-\xa0Consider a ball falling from the roof of the building when at top of the building the ball has only potential energy and when it starts falling potential energy decreases and kinetic energy starts increasing. At the ground it has only kinetic energy. 1st law of thermodynamics is also called law of conservation of energy. According to this law energy may change from one form to other but total energy of system will remain constant .. Hope this answer is helpful to u ??? |
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| 6. |
Derive k.p&k.c for decomposition of PCl5 |
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| 7. |
What is inert effect |
| Answer» The inert pair effect is defined as the tendency of electrons in the outermost atomic s orbital to remain unionized or unshared in compounds of post-transition metals. ... When we say that electrons are inert, we essentially mean that they are spin paired. An example is in helium, with two electrons. | |
| 8. |
What is an oxidation state |
| Answer» The oxidation state, sometimes referred to as oxidation number, describes the degree of oxidation (loss of electrons) of an atom in a chemical compound. Oxidation states are typically represented by integers which may be positive, zero, or negative. In some cases, the average oxidation state of an element is a fraction, such as 8/3 for iron in magnetic (Fe3O4 ). | |
| 9. |
Elements of 13 ,14 ,15 group |
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| 10. |
Convert acetylene to Acetaldehyde |
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| 11. |
Which is best channel for studying Chemestrty ???????? |
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Answer» Ok Physics wallah Alakh pandey Physics wallah go to etoos Physics wallah Aache se explain karne wala |
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| 12. |
what is the name of the carbon compound? HOOC-CH2-CHO |
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Answer» 3 formyl propan-1-oic acid 2-formyl ethanoic acid or 3-oxo propanoic acid. |
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| 13. |
What is formula of crotonic acid |
| Answer» C4H6O2Molar mass: 86.09 g/mol | |
| 14. |
What is formula of melamine |
| Answer» C3H6N6IUPAC ID: 1,3,5-Triazine-2,4,6-triamineMolar mass: 126.12 g/mol | |
| 15. |
Heirenbergs uncertainty principle |
| Answer» According to the Heisenberg\'s Uncertainty principle, it is impossible to determine simultaneously the exact position and the exact momentum of an electron (microscopic particle) with absolute accuracy and certainty. Mathematically, it can be represented asΔx × Δpx ≥ h/4pieOr, Δx × Δ(mvx ) ≥ h/4pieOr, Δx × Δvx ≥ h/4pie ×mWhere,Δ x is the uncertainty in positionΔ vx is the uncertainty in velocityΔ px is the uncertainty in momentumIf the uncertainty in position (Δx) is less, then the uncertainty in momentum (Δpx ) would be large. On the other hand, if the uncertainty in momentum (Δp) is less, the uncertainty in position (Δx) would be large. | |
| 16. |
Ouantum number |
| Answer» Is your mean Quantum Numbers ?Then Quantum numbers are a set of values that describes the state of an electron including its distance from the nucleus, the orientation and type of orbital where it is likely to be found, and its spin. | |
| 17. |
What is solubility product ? |
| Answer» The solubility product is a heterogeneous equilibrium constant, a specific form of the equilibrium constant. It is relevant in saturated solutions in which an ionic compound has not fully dissolved.Solubility products change with temperature, so the temperature at which a solubility product was measured must always be quoted. | |
| 18. |
Isothermal process |
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Answer» Isothermal is a process in which change in temperature remains constant ,,, ∆T =0 ....... In this process temperature remains constant so there no change in temperature hence, internal energy of the system do not change so in this process amount of heat ∆Q = ∆W An isothermal process is a change of a system, in which the temperature remains constant: ΔT = 0. |
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| 19. |
Which has the high melting point orthonitro phenol or paranitro phenol? Give reason |
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| 20. |
Can any body tell me is Graham law of diffusion is in syllabus ?? |
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Answer» No it is not in syllabus Yes |
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| 21. |
Give reason 2Na(s) + H2 gives 2NaH is a redox change |
| Answer» because both Na and H2 have 0 change it is on ground state after in product they have + and - charge so redox rxn occurs here | |
| 22. |
What will happen when acetopheone trealed with amalgamaled zinc in the presence of conc. HCl |
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| 23. |
What is\'n\' denote |
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Answer» No. Of moles No. Of moles no. Of moles |
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| 24. |
what is inert pair effect? up to which group it is applicable? |
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Answer» The inert pair effect is defined as the tendency of electrons in the outermost atomic s orbital to remain unionized or unshared in compounds of post-transition metals. ... When we say that electrons are inert, we essentially mean that they are spin paired. An example is in helium, with two electrons. Decrease in oxidation state by 2. (In p block) |
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| 25. |
Why atomic radius of gallium is less than aluminium? |
| Answer» Aluminium and gallium belongs to group 13.Generally, atomic radii increases on moving down in a group.But the atomic size of gallium is less than aluminium although it lies below aluminium in the group.This because of the poor shielding or screening effect of electrons in the 3d orbital of gallium. | |
| 26. |
Define anomalous behaviou of boran |
| Answer» Like Li and Be, boron – the first member of group 13 – also shows anomalous behavior due to its low size and high nuclear charge/size ratio, high electronegativity and non – availability of d electrons. The main point of differences is:-1. Boron is a typical non-metal whereas other members are metals.2. Boron is a bad conductor of electricity whereas others are good conductors.3. Boron shows allotropy and exists in two forms—crystalline and amorphous. Aluminum is a soft metal and does not exist in different forms.4. Like other non metals, the melting point and boiling point of boron are much highr than those of others elements of group 13.5. Boron forms only covalent compounds whereas aluminum and other elements of group 13 also do form some ionic compounds.6. Hydroxides and oxides of boron are acidic in nature whereas those of others are amphoteric and basic.7. The trihalides of boron exist as monomers. On the other hand, aluminium halides exist as dimmers.8. The hydrides of boron i.e. boranes are quite stable while those of alumimium are unstable.9. Dilute acids have no action on boron. Other members of group 13 liberate h2 from dilute acids.10. Borates are more stable than aluminates.11. Boron exhibit maximum covalency of four e.g., BH4- ion while other members exhibit a maximum covalency of six e.g.12. Boron does not decompose steam while other members do so. | |
| 27. |
Lewis dot structure of [H2O7]–² |
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| 28. |
draw covalent bonding of SOFCl2 |
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| 29. |
what is the functionak group name of cne3 |
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Answer» its Ch3 i also dont knoe Sorry dont ??? Please answer this question i also donot know the answer |
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| 30. |
Why ClO4– doesn\'t show disproportionate reaction? |
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| 31. |
what is univalent radicals |
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Answer» Having valence 1, regardless of whether the valence is positive or Having a valence of one; capable of combining with, or of being substituted for, one atom of hydrogen; monovalent; -- said of certain atoms and radical |
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| 32. |
What is electron gain enthelpy |
| Answer» Electron gain enthalpy is defined as the amount of energy released when an electron is added to an isolated gaseous atom. During the addition of an electron, energy can either be released or absorbed.Sign Convention For Electron Gain Enthalpy:Negative: When energy is released while accepting an electron.Positive: When energy is supplied to an atom while adding an electron. | |
| 33. |
Why co2 is inorganic compound it is also made from carbon then?? |
| Answer» The answer is because organic molecules don\'t just contain carbon. They contain hydrocarbons or carbon bonded to hydrogen. The C-H bond has a lower bond energy than the carbon-oxygen bond in carbon dioxide, making carbon dioxide more stable/less reactive than the typical organic compound. | |
| 34. |
Be2 molecule does not exist |
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Answer» Beryllium molecule is also not possible because according to valence bond theory the number of repulsive forces is more than the number of attractive forces.So Be2 is not possible AnswerThe electronic configuration of Beryllium is 1s2 2s2.From the electronic configuration it is clear that there is no singly filled atomic orbital present in beryllium.Without the half filled orbital,the overlapping is not possible ,therefore Be2 molecule does not exist. |
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| 35. |
Explain ion-exchange method. |
| Answer» Ion exchange describes a specific chemical process in which unwanted dissolved ions are exchanged for other ions with a similar charge. | |
| 36. |
Explain synthetic resins method. |
| Answer» Synthetic resins method is a method used for removing permanent hardness of water. In this method ion exchange resins (RSO3H) is changed to RNa by treating it with NaCl. Then, RNa exchanges Na+ ions with Ca2+ and Mg2+ ions present in hard water and as a result, hard water is softened.2RNa + M2+ → R2M + 2Na+R2M + 2 NaCl → 2RNa + MCl2 | |
| 37. |
What is Sigma or Pi bond? |
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Answer» Maths student Thanks . I am a science (non- medical ) student. Nicely explained ......are you a computer CS student or bio stud.?? for example methane molecule contain 4 C-H sigma bonding.. For example, ethylene molecule contain 5 sigma bonding and 1 pi bonding in it. Sigma And Pi Bonds. A sigma bond is a covalent bond which is formed by the head on overlap of two atomic orbitals. The combination of overlapping orbitals can be s-s, s-pz or pz-pz. ... A Pi bond is a covalent bond which is formed by the side-to-side overlap of two atomic orbitals. Single bond is Sigma bond and double bond is Pi bond |
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| 38. |
Why some elements like Al shows amphoteric nature?? |
| Answer» Aluminium oxide is amphoteric. It has reactions as both a base and an acid. Reaction with water: Aluminum oxide is insoluble in water and does not react like sodium oxide and magnesium oxide. The oxide ions are held too strongly in the solid lattice to react with the water | |
| 39. |
What is antimarkovnikov rule |
| Answer» In anti-markovaniko the more electronegative atom added to that double bonded carbon atom which has more number of Hydrogen atom. | |
| 40. |
What do you mean by dielectric constant |
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Answer» The dielectric constant is the ratio of the permittivity of a substance to the permittivity of free space. It is an expression of the extent to which a material concentrates electric flux, and is the electrical equivalent of relative magnetic permeability. As the dielectric constant increases, the electric flux density increases, if all other factors remain unchanged. The factor which weaken the electrostatic force of attraction is said to be dielectric constant.or due to this factor water is universal solvent. |
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| 41. |
What is a critical temp. ❓ |
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Answer» There is a certain temp. of gas at which gas will not liquify however high pressure is applied This temp is called critical temp. The critical temperature of a substance is the temperature at and above which vapor of the substance cannot be liquefied, no matter how much pressure is applied.Every substance has a critical temperature. Some examples are shown below.Critical temperature of NH3 = 132° |
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| 42. |
Why is o, m, and p ate used in aryl groups ❓ |
| Answer» These symbolize ortho ,meta and para positions in benzene ring | |
| 43. |
Examples of isomerism? |
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Answer» Like alcohol and ether examples of isomerism is propane and prop2-ane |
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| 44. |
Why Cs is used to photoelectric cells |
| Answer» Cs element when irradiated with light,the light energy absorbed may be sufficent to make an atom lose electron.This property makes cs used as in photoelectric cells. | |
| 45. |
Define hyperconjucation ? |
| Answer» The hetrovalence resonance arising due to breaking of alpha-CH bond is said to be hyper conjucation.It is also called sigma-pie conjugation or super conjugation. | |
| 46. |
How to find oxydation number of any element? |
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Answer» Thnx alot dudè Jitne elements hote hai oxidation no. Ko utne se multiply karte hai aur agar nahi pata to x karke solve karte hai Agar koi charge hai to uske equal rakte hai varna 0 ke equal rakye hai Oxidation of some elements are fixed1st group elements always get +1 and 2nd group elements always get+2 aur bhi hai . U consult them from book. |
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| 47. |
Explain Gibbs free energy |
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Answer» if free energy nothing the maximum amount of energy available to the system that can be converted to use full work where is example Delta g is equal to delta h minus t delta spontaneity of GIF free energy is Delta s total is equal to Delta system + Delta air surrounding Exactly any system in the nature doesnt use its all energy to do any useful work actually it frees that much energy only that the task or work would be complete so the defination is the amount of energy that is free by the system to do maximun useful work is called gibbs free energy |
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| 48. |
discuss the chemistry of lassaigne\'s test? |
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| 49. |
What is equilibrium exactly |
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Answer» Hi Thanku ma\'am for answer but I was a little examining what everybody knows.actually simple diefination of equilibrium is that any thing constant with time is said to be in equilibruim yes its a different matter that it is further divided but as far as I think this is the simple one It represents the state of a process in which the properties like temperature , pressure ,concentration of a system do not show any change with time. |
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| 50. |
Why alkynes acidic in nature |
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Answer» Is it right I think alkynes are in first group and in first group there are all metals which have h+ so they |
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