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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. |
Difference between isotopes and isobars |
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Answer» Sach atoms of same elements having same atomic number but different mass number is called isotopes and such atoms of different elements which have same mass number and different atomic number is called isobar Atoms of same elements having different atomic masses called isotopes.Atoms of different elements habing same aromic masses called isobars. Two elements having same mass numbers but different atomic numbers called isobars. Two elements having identical atomic numbers but different atomic mass called isotopes Isobars are the atoms with same mass number but different atomic number. And on the other hand Atoms with identical atomic number but different atomic mass are called isotopes. |
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| 2. |
write 25 structure with IUPSE name |
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| 3. |
Nomenclature of organic compounds |
| Answer» In chemical nomenclature, the IUPAC nomenclature of organic chemistry is a systematic method of naming organic chemical compounds as recommended by the International Union of Pure and Applied Chemistry (IUPAC). There is also an IUPAC nomenclature of inorganic chemistry. | |
| 4. |
Difference between orbit and orbitals |
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Answer» Orbit :An orbit is a well defined circular path around the nucleus in which the electrons revolve.It represents the planar motion of an electron around the nucleus.Orbital :1.An 39 orbital is the three dimension space around the nucleus within which the probability of finding an electron is maximum (upto 90%).2.It 14 represents the three dimensional motion of an electron around the nucleus. Simple, orbit\'s (K L M N ......) and orbitals (s p d f) An orbit is a fixed path around a heavy object on which a lighter object moves due to gravitational forces or electromagnetic forces while an orbital is an uncertain area around the nucleus of an atom in which the probability of finding an electron is maximum |
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| 5. |
Calculate the volume of the co2 at STP produced by combustion of the CH4CH4+2o2=CO2+2H2O |
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Answer» Thanks for your help Answer : The amount of carbon dioxide formed is, 76.93 gSolution : Given,Mass of methane = 80 gMolar mass of methane = 16.042 g/moleMolar mass of carbon dioxide = 14.026 g/moleFirst we have to calculate the moles of .Now we have of calculate the moles of carbon dioxide.The balanced chemical reaction is,Form the reaction, we conclude that1 mole of methane react to give 1 mole of carbon dioxide5.485 moles of methane react to give 5.485 moles of carbon dioxideNow we have to calculate the mass of carbon dioxide.Mass of carbon dioxide = Moles of carbon dioxide × Molar mass of carbon dioxideMass of carbon dioxide = 5.485 moles × 14.026 g/mole = 76.93 gTherefore, the amount of carbon dioxide formed is, 76.93 g |
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| 6. |
The mass% of NaOh in 5 molal aqueous NaOh solution is |
| Answer» 1 mole NaOH is equivalent to 40 gm of NaOH.Molality can be defined as the number of moles of solute in 1000 gm of solution.Thus 5 molal aqueous NaOH solution contains, [ (5 x 40) = 200 ] gm NaOH. Thus water present in the solution = (1000 - 200) = 800 gmMoles of water present = (800 / 18) = 44.45Thus the mole fraction of NaOH = (moles of NaOH / Total moles in solution) = (5 / 5 + 44.45) = 0.101 | |
| 7. |
How many sub shell associated with n=4 |
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Answer» All four subshells s,p,d and f are associated with n=4 Their will be four subshell |
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| 8. |
State (n+l) rule |
| Answer» It states that more will be the sum of (n+l) more will be the energy of orbitals | |
| 9. |
Can anyone define zero overlap |
| Answer» A negative phase overlap results when two orbitals with different phase overlap with each other. A zero overlap will results when orbitals do not overlap at all or do not overlap effectively and this overlap of orbitals does not result in bond formation. | |
| 10. |
Among fluorine, argon and silicon, which has maximum nuclear charge? |
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Answer» Argon Argon bcz effective nuclear charge increases as we move left to right in a period Thanks for the answer ?? Argon is right answer Mujhe3 bhi argon hee lg rha hai bt kucu bche fluorine bol rhe hai I think argon yaar |
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| 11. |
Explain non stiochiometric hydrides |
| Answer» Non-Stoichiometric hydrides are the hydrogen-deficient compounds formed by the reaction of dihydrogen with d-block and f-block elements.These hydrides are ionic in nature. Hydride ions have comparable sizes (208 pm) with alkali metal ions. Hennce, strong binding forces exists between the constituent metal and hydride ion and as the result stichiometric hydrides are formed. These hydrides do not follow the law of constant composition.FOR EXAMPLE1.LaH 2.872.YbH 2.55. | |
| 12. |
State Dalton\'s law of partial pressure |
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Answer» P total= P1+P2+P3 •••• According to the Dalton\'s law of partial pressure, the pressure exerted by the mixture of non-reactive gases is equal to the sum of partial pressure of the individual gases. |
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| 13. |
State and explain avogadro\'s law |
| Answer» Avogadro Law\tIt states that equal volumes of all gases under the same conditions of temperature and pressure\tcontain equal number of molecules. Mathematically,\tV ∞ n\tV = k4n\tThe number of molecules in one mole of a gas = 6.022 ×1023\tThis is termed as Avogadro constant. | |
| 14. |
Increasing order of stability of : N2, N2+, N2-,N2-- |
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Answer» N2>N2->N2+.Nitrogen is an electronegative atom. It can manage an added negative charge easily.But N2 + will be highly unstable.Obviously N2 is most stable in given options.so above order is correct order of their stability. What about N-- |
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| 15. |
How we balance the reaction step by step |
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Answer» Thanks Firstly we should write the reaction then put its value in reactant and product side after that we have to see is product and reactant is equal or not,if it is,then it is ok and if it is not,equalise both side by putting the right value.now the reaction is balanced. |
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| 16. |
Hi sweetie what is octet rule |
| Answer» According to the octet rule, atoms can combine either by transfer of valence electrons from one atom to another or by sharing of valence electrons in order to have an octet in their valence electrons. | |
| 17. |
Pattern of question paper according to topics |
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| 18. |
Wurtz reaction..? |
| Answer» When we take 2 moles of alkyl halide and react it with 2 moles of sodium metal in presence of dry ether ,we get an alkane. This reaction is called wurtz reaction. | |
| 19. |
What is the effect of temperature on viscosity?and why? |
| Answer» The viscosity tends to decrease with temperature increase in liquids while in gases viscosity increase with rising temperature. | |
| 20. |
Which element is heavier in density??️?️?️?️?️ |
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Answer» Osium Osium☺️☺️☺️☺️☺️☺️ |
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| 21. |
Which element has largest atomic radius ?????? |
| Answer» Cs ??? | |
| 22. |
What is dipole?Explain. |
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Answer» It is a positive and negative charges q×d Thank you friend Dipole-dipole forces are attractive forces between the positive end of one polar molecule and the negative end of another polar molecule. Dipole-dipole forces have strengths that range from 5 kJ to 20 kJ per mole. They are much weaker than ionic or covalent bonds and have a significant effect only when the molecules involved are close together (touching or almost touching).☺️☺️☺️☺️The figures show two arrangements of polar iodine monochloride (ICl) molecules that give rise to dipole-dipole attractions.?????? |
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| 23. |
HBr is dimer or not |
| Answer» What | |
| 24. |
What is hybridisation ? Explain its types. |
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Answer» Mixing of atomic orbitals to form hybrid orbitals hybridisation is the mixing atomic orbitals into new hybrid orbitalls suitable for the pairing of electrons to form chemical bonds in valence bond theory.Types of hybridization: 1) Intervarietal hybridization. 2) Distant hybridization. |
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| 25. |
What is electrvalent bond hello gg |
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Answer» A chemical bond formed between positive and negative ions as a result of elecrostatic attraction is known as electrovalent bond Check in book ncert |
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| 26. |
Equilibrium mixture |
| Answer» A chemical reaction is in equilibrium state, when the concentrations of reactants and products are constant and their ratio does not vary each other | |
| 27. |
Electronic configuration up to calcium |
| Answer» 2, 8, 8, 2 | |
| 28. |
Calculate number of radial and angular nodes and total number of nodes in 5p orbital |
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Answer» Radial and angular nodes are 3 and 1 and total nodes 4 6 |
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| 29. |
Important topics of ch 6 Thermodynamics |
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Answer» You can check on thishttps://mycbseguide.com/cbse-revision-notes.html On this app |
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| 30. |
Find the wavelength ratio of 2nd and 3rd orbit of Balmer series |
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| 31. |
What is s character? |
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| 32. |
Calculate the mass percent of different elements present in sodium sulphate . |
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| 33. |
What is the configuration of periodic number 79 |
| Answer» 4f 14 5d 10 6s 1 | |
| 34. |
The shape of CCl4 molecule is |
Answer» \xa0CCl4 has a tetrahedral shape, owing to four bond pairs of electrons repelling each other to positions of maximum separation and minimum repulsion. The angle between bonds is 109.5 degrees.In the carbon tetrachloride molecule, four chlorine atoms are positioned symmetrically as corners in a tetrahedral configuration joined to a central carbon atom by single covalent bonds. Because of this symmetrical geometry, the molecule has no net dipole moment; that is, CCl4 is non-polar. Methane gas has the same structure, making carbon tetrachloride a halomethane. As a solvent, it is well suited to dissolving other non-polar compounds, fats and oils. It can also dissolve iodine. It is somewhat volatile, giving off vapors having a smell characteristic of other chlorinated solvents, somewhat similar to the tetrachloroethylene smell reminiscent of dry cleaners\' shops. |
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| 35. |
At what temperature will the average speed of CH4 molecules has the same value as D2 has at 300K ? |
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| 36. |
Cbse board Question |
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| 37. |
Compare wonder wall force and boiling point between cl2 and br2 |
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| 38. |
Explain the physical significance of vander waals parameters....plz give me ans . fast |
| Answer» Van der Waals equation:The value of parameters a and b depend upon the characteristics of a gas. Here, a is the measure of the magnitude of intermolecular forces of attraction and b is the measure of the effective volume of the gas molecules. | |
| 39. |
H2O is liquid while H2S is gas why |
| Answer» Because the molecule of water form hydrogen-bond between them..while h2s doesn\'t have hydrogen bond...h2o has more intermolecular attractions as compared to h2s... | |
| 40. |
Vspr theory of XeF4,BrF5,ClF3 |
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| 41. |
SF6,CH4,H2O,NH3,FO2,BF3,NH4+,BeCl2,HgCl2 arrange in increasing order |
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| 42. |
Atomic no Na |
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Answer» 11 Hi Ravi 11 Wow aap hee puch k aap hee answer 11 yaar 11 |
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| 43. |
What is electronegativity ? |
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Answer» Nothing It is tendency of an atom to attract shared pairs of electron Hello Harender . Where r u from ? I know u i think It is defined as the tendency of an atom to attract shared pair of electron towards itself |
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| 44. |
Stiochiometry |
| Answer» What??????????!! | |
| 45. |
Hybridised of ch3 |
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Answer» Sp3 SP3 |
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| 46. |
Calculate no. Of moles in 7.9 mg of calcium |
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Answer» .2 moles 7.9 /1000 ×40 |
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| 47. |
What is oxidation number of Cr |
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Answer» Maximum +7 +6 +3 |
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| 48. |
What is the mass of Photon of sodium light of wavelength 589mm (h=6.62×10^-34) |
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| 49. |
Do u have chem.. side book of together with |
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Answer» Mujhe iss book k chapter k questions chahiyePlz koi de do Yes Wahi toh hum Bhee poonch rahe hain, kya poonchna hai Aapko...???? Kya? ya op tondon What do you mean by Side Book ???? |
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| 50. |
Define trospheric pollution.which oxides are responsible for this pollution? |
| Answer» NO and N20 | |