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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 schottky defect |
| Answer» Schottky Defect: It is basically a vacancy defect in ionic solids. In order to maintain electrical neutrality, the number of missing cations and anions are equal. Like simple vacancy defect, Schottky defect also decreases the density of the substance. Number of such defects in ionic solids is quite significant.For example, in NaCl there are approximately 106 Schottky pairs per cm3 at room temperature. In 1 cm3 there are about 1022 ions. Thus, there is one Schottky defect per 1016 ions. Schottky defect is shown by ionic substances in which the cation and anion are of almost similar sizes. For example, NaCl, KCl, CsCl and AgBr. It may be noted that AgBr shows both, Frenkel as well as Schottky defects.< | |
| 2. |
Inert pair effect what ❓? |
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Answer» The reluctance of s electron pair in take part in chemical bonding In the elements of 4th, 5th and 6th period of the p-block the electrons present in the intervening d and f-orbitals do not shield the r-electrons of the valence shell effectively.As a result, {ns}2 -electrons remain more tightly held by the nucleus and hence, do not participate in bonding. This is called inert pair effect. |
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| 3. |
How does surface tension of a liquid changes with temperature |
| Answer» Surface tension and viscosity both are due to intermolecular forces. As the temperature increases the kinetic energy of molecule increases this leads to the decrease in intermolecular forces and therefore decrease in surface tension and viscosity. So we can say that temperature inversely affect the surface tension and viscosity. | |
| 4. |
Write relationship between Kp and Kc |
| Answer» Kp=kc ×RT | |
| 5. |
Alkyl halides on reduction with zinc and dilute HCL acid give alkanes but why except fluorides? |
| Answer» Because when flourine is combined to any of alkyl group then C-F bond is very strong ( flourine is most electronegative element) so it cant be broken by reduction... | |
| 6. |
Difference between solubility product and ionic product |
| Answer» Both ionic product and solubility product represent the product of the concentrations of the ions in the solution. The term ionic product has a broad meaning since, it is applicable to all types of solutions, either unsaturated or saturated and varies accordingly.On the other hand, the term solubility product is applied only to a saturated solution in which there exists a dynamic equilibrium between the undissolved salt and the ions present in solution. Thus the solubility product is in fact the ionic product for a saturated solution at a constant temperature. | |
| 7. |
arrange in increasing order of thermal stability LiHCO3 KHCO3 AND NaHCO3 |
| Answer» LiHCO3 does not exist and thermal stability increase down the group | |
| 8. |
Cac2 + H2o -------> A ----------> B |
| Answer» 2CaC2+ 6H2O~~2CaCO3 +2C2H6 | |
| 9. |
what type of intermolecular forces exist among H2S molecule |
| Answer» Dipole-dipole forces ?? | |
| 10. |
Plz give me solution of last year papers (sample paper 1) |
| Answer» | |
| 11. |
Which is known as tilden reagent |
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Answer» Nocl Nitrosyl chloride is the chemical compoundwith the formula NOCL. It is a yellow gas that is most commanly encountered as a decomposition products of aqua regia , a mix. Of HCL and HNO3.it is a strong elctrophile and oxidising agent known as a tilden reagent |
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| 12. |
Give me question on markonikov and antimarkonikov of chapter hydrocarbon |
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Answer» on google there is many questions .give me some main questions search on google for practice questions for markonikov and anti marconikov rule u will find there various types |
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| 13. |
State hund\'s rule |
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Answer» Hund’s rule\tAccording to this rule, the\xa0electrons are filled in the degenerate orbitals of the same subshell.\tElectron pairing in p, d and f orbitals cannot be done until each sub-shell is occupied singly.\tThis is because electrons are the same in charge and they repel each other. This repulsion is minimized if two electrons move away from each other by acquiring different degenerate orbitals.\tAll the orbitals which are singly occupied have parallel spins which can be either clockwise or anticlockwise.\tIf the electrons have parallel spin then there will be less inter-electronic repulsions and high spin multiplicity.\tSo in order to maximize spin multiplicity, the pairing of electrons in a sub-shell does not take place until each sub-shell is singly occupied. Every orbital in a sublevel is singly occupied before any orbital is doubly occupied |
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| 14. |
Can i clear jee advanced by studying in 12thI got 95% in 10th |
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Answer» Hey Prakhar me also got the same marks as u in 10th and i too was the topper of my scl?? Now I m giving my 11th exam Bro 10 th to easy tha...donot get overconfident...because i also got 95.2% marks and i was the topper of my school..but 11th and 12 th are different .Study is one level up...if u want to get success donot think about it also work very very hard for it..??.....all the best..?? In 11 class which stream you take |
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| 15. |
Formula of Number of valance cell |
| Answer» Formula for no. Of valence shell | |
| 16. |
Calculate the Milarity if 20g of sodium hydroxide dissolved in 200ml of water. ? |
| Answer» | |
| 17. |
Oxygen has less negetive electron gain enthalpy than sulphur... Why??? |
| Answer» The negative electron gain enthalpy is more in sulphur than in oxygen because, both of them are in 16th group in which teh oxygen is 1st element which has the minimum size and sulphur has larger size due to addition of a new shell.So, due to smaller size the inter-electronic repulsion in compact 2p-orbitals of oxygen is much more than the repulsion in 3p-orbitals of sulphur hence, the incoming new electron feels less attraction in oxygen and more attraction in sulphur due to which the addition becomes easy and so electron gain enthalpy becomes more negative in sulphur. | |
| 18. |
Why electron has negative charge? |
| Answer» As atom is overall electrically neutral and proton have position charge so to maintain the neutrality an opposite charge is required therefore electron is negatively charged. | |
| 19. |
Energy level diagraM for no2+ |
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| 20. |
on the basis of quantom no. justify that 6 period have 32 element? |
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| 21. |
Iupac name and symbol of element having atomic number 115 |
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Answer» She is right? Iupac name : ununpentium & symbol : uup |
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| 22. |
In the chemistry what is important theory or the reactions |
| Answer» | |
| 23. |
Explain Acidicd hydrate |
| Answer» | |
| 24. |
What is Qc in equilibrium |
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Answer» Other than equilibrium concentration, concentration ,of reaction is known as the Qc equilibrium It is the ratio of conc. of products to the conc. of reactants with each conc.term raise to the power equal to the stiochiometry of balance chemical equation Qc = [C]^c ×[D]^d -------------------- [A]^a×[B]^b At the time of equilibrium Qc is equal to Kc |
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| 25. |
I not understand why lutetium is f block element because last electron enters in d orbital. |
| Answer» Lutetium is d-block element .It\'s electronic configuration is 5d¹ .Or Atomic no. 71 and 103 group doesn\'t exist. | |
| 26. |
Explain molecular orbital theory of benzene |
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| 27. |
Iupac name of AAnd F |
| Answer» | |
| 28. |
Whats is the 2nd law of Thermodynamics? |
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Answer» According to Second law of thermodynamics (SLOT) Without the help of external agency a spontaneous process can not be reversed. OrAccording to SLOT the entropy of the universe always increase in energy spontaneous change . Accordingg to second law of thermodynamics ,, " It is impossible to build a machine that convert 100% heat into work as there is some amount heat loss while doing work " |
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| 29. |
What is hydride? |
| Answer» The binary compounds of hydrogen with metals and non-metals are called hydrides. The hydrides are of three types:(i) Ionic or salt like hydrides: These hydrides are formed by the highly electropositive elements of Group 1 and Group 2 except Be and Mg. They are formed by the transfer of electrons from the metals to the hydrogen atom. As such they are ionic compounds (Li+H-) and thus behave like salts. For example, LiH, NaH, CaH2.(ii) Molecular or covalent hydrides: These are formed by elements having higher electronegativity than hydrogen i.e. by the p-block elements. These are formed by sharing of electrons between the element and hydrogen atom. As such they are covalent or molecular compounds.(iii) Metallic or interstitial hydrides: The d-block and f-block elements combine with hydrogen to form non-stoichiometric interstitial hydrides. Hydrogen is in the atomic state which occupies interstitial holes in close-packed metal structures. The composition of an interstitial hydride changes with temperature and pressure. These hydrides give out hydrogen easily and hence act as strong reducing agents. | |
| 30. |
Diffrence between paramagnatic and diamagnatic |
| Answer» \tParamagnetic: Those substances which are attracted by magnetic fields are called paramagnetic substances. Paramagnetic materials such as aluminum and air have permeability’s slightly greater than that of free space (for air μr\xa0=1.0000004).\tDiamagnetic :Those substances which are\xa0repelled by magnetic fields are called diamagnetic substances. A material that turns at a right angle to the field by producing a magnetic response opposite to the applied field is called diamagnetic material such as silver, copper, and carbon have permeability’s slightly less than free space | |
| 31. |
Intra and entra hydrogen bonding |
| Answer» Intra bond formed between the same molecule of same or different compound..Entra formed when hydrogen bond is in between highly electronegative elements of same compound.. | |
| 32. |
Why milkiness disapear when co2 passed from solution? |
| Answer» When CO2 is passed through lime water , it turns milky due to the formation of insoluble calcium carbonate . When excess of CO2 is passed through it , milkyness diappears due to the formation of soluble calcium bicarbonate | |
| 33. |
Arrange the following in increasing order of stability ( ch3)3c+,ch |
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| 34. |
Which type of question are asked in viva . |
| Answer» In which viva?If it is for any PMT exam then usually basic things have been asked since time immemorial | |
| 35. |
What is the relationship between cp and cv |
| Answer» ∆H=∆U + nR∆T.......(1) (∆H= nCp∆T) (∆U= nCv∆T)For one mole of a gas,n=1On putting values of ∆H and ∆ U in eq. 1Cp∆T= Cv∆T+ R∆T(Cp-Cv)∆T=R∆T=> Cp-Cv=R | |
| 36. |
5 sec butyl 4 isopropyldecane |
| Answer» | |
| 37. |
Dehydration of alcohol |
| Answer» Ch3Ch2OH-H2O:-CH2DOUBLE BOND CH2 | |
| 38. |
Why NAOH is basic oxide in nature ? |
| Answer» On dissolution in water it gives out oh- ions.. by arhenius concept its then classified base OrMetallic oxides are classified as basic in nature | |
| 39. |
How to find the value of log |
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| 40. |
why every redox reaction is exothermic |
| Answer» | |
| 41. |
mass of 2.5g of magnesium |
| Answer» Mass of 2.5 moled of Mg=56 | |
| 42. |
Calculate the number of moles of carbon and hydrogen in 3 moles of ethane |
| Answer» There are two atoms of Carbon in each C2H6\xa0molecules hence 1 mole of C2H6\xa0will have 2 moles of carbon atoms. So that Number of moles of carbon atoms in 3 moles of C2H6\xa0= 2 x 3 = 6 moles | |
| 43. |
Mcq related aromaticity,non-aromatic compounds |
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| 44. |
What is fajans rule |
| Answer» More the charge, The more will be covalent character, charge can be either positive or negative. | |
| 45. |
What is Zeemat effect |
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Answer» Splitting of spectral lines in presenceof magnetic field. Looda lesson |
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| 46. |
What is Le chateleir\'s principle |
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Answer» If there is any change in the factor that determines the equilibrium of a chemical reaction then the equilibrium will be shifted in that direction so as to reduce or to counteract the effect of change. Le-Chatelier’s Principle or more commonly known as the “Equilibrium Law” is one of the most important laws that help us to understand qualitatively, how the equilibrium reacts to any change that it encounters.Le-Chatelier’s Principle states that “Once a dynamic equilibrium has been established, any change brought about in the conditions will be compensated by a balance shift so as to counter the original change.” |
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| 47. |
Define physical equillibrium |
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| 48. |
Carbon-Oxygen bond lengths are equal in carbonate ion. Explain |
| Answer» | |
| 49. |
Guys i have only one day for preparation of chem exam rather nervous kaise hoga tension . |
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Answer» It was nice akash Listen...kriti ....inspite of thinking that u have less time....focus on the max. time that is remaining with you....make ur concept clear and if u have less time than don\'t do hard work ...just do smart work...prepare ...nice for those topic whom u feel will have the max. Chances of coming in exam........And at last...be calm...and give ur best.... Guys answer |
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| 50. |
Oxygen has lower first ionization enthalpy than nitrogen and fluorine.give reason |
| Answer» Because oxygen has 4 electrons in it\'s 2p orbital and it would prefer to loose one electron to attain half-filled configuration which is a stable form. That\'s why it has lower first ionization enthalpy than N and F.?? | |