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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. |
What is the general characteristics of alkali metals? |
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Answer» The alkali metals, found in group 1 of the periodic table (formerly known as group IA), are very reactive metals that do not occur freely in nature. These metals have only one electron in their outer shell. Therefore, they are ready to lose that one electron in ionic bonding with other elements. They belong to first group in periodic table and their valency is plus 1 1electron in valence shellShow +1oxidation stateForm ionic bondTheir hydrides are alkaline in natureAtomic size increasesIs ionization enthalpy decreases |
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| 2. |
Why sodium hydroxide is called caustic soda? |
| Answer» Sodium hydroxide is an alkali which is also known as caustic soda. Caustic means "burning" and caustic soda takes its name from the way it can burn the skin. It has the chemical formula of NaOH. ... As a solid, the alkali is deliquescent and readily absorbs moisture and carbon dioxide from the air. | |
| 3. |
How can I improve myself in chemistry numerical |
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Answer» By mentally thinking that i can do it By solving them again and again First study the basics and then try numericals Study hard |
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| 4. |
Lewis structure of butene |
| Answer» CH3 -CH2-CH2-CH3 | |
| 5. |
What is the full form of chemistry |
| Answer» C-CarbonH-HydrogenM-MetalsE-ElementsS-SortingT-TestingR-ReactingY-Yielding | |
| 6. |
Hybrid |
| Answer» To make the quality of two or more than two in one | |
| 7. |
On which factor does the concentration of solute in a saturated solution depends? |
| Answer» Solvent | |
| 8. |
What is ionic bond?Give examples |
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Answer» Example like Nacl , BeF2 etc u just fill the octate u will understand it The bond which formed by transferring of electron |
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| 9. |
Why do we take W=-PΔV in negetive? |
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Answer» because we take dV as (final volume - initial volume)And as you know final volume is less than the initial volume due to more pressure in side.then the value of dV is negative.hence,W=P(-dV) => W=-PdV Because it is in opposite direction |
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| 10. |
What is Gibbs energy? |
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Answer» It is represented as G=H-TS The maximum amount of energy available to a system during a process that can be convert into useful work is known as Gibbs free energy Gibbs energy is a state function which is related with enthalpy and entropy. When in any reaction , spontaneity is not determined by ∆H and ∆S individually , then we relate these both state function to find a new state function, that is called Gibbs energy |
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| 11. |
iupac names of CH3-C(CH3 )2-CH2Cl |
| Answer» | |
| 12. |
What is the shape of pcl6- molecule according to VSEPR |
| Answer» Bent | |
| 13. |
How can electronic configuration can be found form preiod and group |
| Answer» In period atomic size decreases by increasing proton but in groups atomic size increases by increasing atomic no | |
| 14. |
fyj |
| Answer» | |
| 15. |
What is naming ch3-ch2-ch=ch-ch2-ch3-ol |
| Answer» Hex-3-en-1-ol | |
| 16. |
Tritium is radioactive why? |
| Answer» | |
| 17. |
Why is broil\'s law?Tommorow exam! |
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Answer» Pressure is inversely proportional to volume at constant temperature Pressure and Volume are inversly proportional to each other.PV=constatnt\xa0 It states that if we increase pressure the volume decreases...so they are inversely proportional to each other. . |
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| 18. |
Oxidation number of Fes |
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Answer» +2 +2 +2 |
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| 19. |
Prove mathematically that electron cannot exist inside the nucleus |
| Answer» | |
| 20. |
Why is helium molecule, He2 not formed? |
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Answer» Because it is noble gas and it cannot react to h2 itself because it has only 2 electron which are completely filled if they are disturbed by other 2 no reaction take place Bond order = 0 Because it is noble gas A nolecule is formed to attain stability amd complete its electrons.Helium has 2 electrons and is stable.so it does not form He2 |
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| 21. |
Why is statement of Avogadro\'s law?Exams 2morrow |
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Answer» Volume of gas is directly proportional to no. Of molecules present in it A modern statement of\xa0Avogadro\'s law\xa0is:Avogadro\'s law\xa0states that, "equal volumes of all gases, at the same temperature and pressure, have the same number of molecules". For a given mass of an ideal gas, the volume and amount (moles) of the gas are directly proportional if the temperature and pressure are constant.which can be written as:
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| 22. |
Structure ofcl2o7 |
| Answer» | |
| 23. |
Structure of |
| Answer» | |
| 24. |
Why work done what will be nagetive |
| Answer» If work done against is opposite to the direction of force applied ?? | |
| 25. |
Iuac name(( CH3)2CH)3CCH2CH3 |
| Answer» | |
| 26. |
What is halides |
| Answer» Those who are formed by halogens | |
| 27. |
What is London force and dipole force |
| Answer» The forced offer attraction between monoatomic gases like oxygen is London force and the force of attraction between too poles is dipole force ???☺ | |
| 28. |
What size hybridisation |
| Answer» | |
| 29. |
Oxidation state of HCO3_ |
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Answer» Five 5 HCO31+x+3(-2)=01+x-6=0x-5=0x=5Oxidation state is 5 |
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| 30. |
What is kernel |
| Answer» The electrons other than valence electrons is called kernels.It is also known as core electrons. | |
| 31. |
Explain me about castner-keller method |
| Answer» | |
| 32. |
What is mole percent and mole fraction |
| Answer» | |
| 33. |
What is oxidation no. of Kl3 |
| Answer» -1 already explained | |
| 34. |
Write all required conditions with examples for oxidation add reduction reaction |
| Answer» | |
| 35. |
In comparison is the temperature high and low |
| Answer» | |
| 36. |
In compression is the temperature high or low? |
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Answer» Pressure and temperature are inversely proportional ritika ji????✌ Temperature increases .Because pv=nrt hence because of compression pressure increases and hence the temperature |
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| 37. |
What is equlibrum |
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Answer» The balance state in which the changes done in such a way that is seeds to bed not change in state?? Equilibrium is a state where rate of forward reaction is equal to rate of backward reaction. In chemistry ,the equilibrium is defined as the state in which both the rate forward and backward reaction is same Equilibrium is a state in which both the forward and backward reaction has taken place simultaneously. |
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| 38. |
Application of thermodynamics. |
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Answer» For all devices who work on heat like thermometer Gas compressor and refrigerator work on second law of thermodynamic. |
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| 39. |
What is alkali metals |
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Answer» Li,Na,K,Rb,Cs,Fr, all are the alkali metals Element of first group are called alkali metals Alkali metals are those metals which form alkali (aqueous base )on mixing with water. |
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| 40. |
The total no. of mono halogenated products formed by halogenation of 2,2,4-trimethylhexane are? |
| Answer» | |
| 41. |
What is delta H |
| Answer» Delta h is for heat enthalpy | |
| 42. |
Relationship between solubility product and molar solubility |
| Answer» | |
| 43. |
Balancing redox reaction |
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Answer» Look in CBSE guide. NCERT solutions of 18.8 question You will be able to understand. Cusou+Zn =znso4 +cu |
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| 44. |
What is the limitation of first law of thermodynamic. |
| Answer» Limitations of the first law of thermodynamics are discussed below:1. No restriction on the direction of the flow of heat: the first law establishes definite relationship between the heat absorbed and the work performed by a system. The first law does not indicate whether heat can flow from a cold end to a hot end or not. For example: we cannot extract heat from the ice by cooling it to a low temperature. Some external work has to be done.2. Does not specify the feasibility of the reaction: first law does not specify that process is feasible or not for example: when a rod is heated at one end then equilibrium has to be obtained which is possible only by some expenditure of energy.3. Practically it is not possible to convert the heat energy into an equivalent amount of work. | |
| 45. |
Lattice entalpy concept |
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Answer» The energy which is released when two or more ion combine to form ionic compound The energy released when ironic compound form ? |
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| 46. |
Here corbon is fuel and oxygen is help in burning |
| Answer» | |
| 47. |
Definition for hydration enthalpy |
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Answer» The heat energy released when new bonds are made between the ions and water molecules is known as the hydration enthalpy of the ion. The hydration enthalpy Sorry Viroids are free RNA molecules of low molecular weight without any protein coat while viruses can have either RNA or DNA molecules encapsulated in a protein coat. Viroids are smaller in size than viruses. They energy released for hydrogen compound |
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| 48. |
Why co2 extinguishes fire |
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Answer» Because it stops effect of oxygen Because it stops the fuel(oxygen) to burn. Hence the fire stops because of lack of Oxygen |
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| 49. |
How we can know that the element on the periodic table is metal or non metal |
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Answer» Plus charge elements are metals and minus charge elements are non metals By the valency of their elements +1or_1 |
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| 50. |
Can u plz explain le chatleir principle? |
| Answer» Le Chatelier\'s principle also called Chatelier\'s principle or "The Equilibrium Law", can be used to predict the effect of a change in conditions on a chemical equilibrium. It can be stated as:When any system at equilibrium is subjected to change in concentration, temperature, volume, or pressure, then the system readjusts itself to counteract (partially) the effect of the applied change and a new equilibrium is established.In other words, whenever a system in equilibrium is disturbed the system will adjust itself in such a way that the effect of the change will be nullified. | |