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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. |
MnO4- + I- gives MnO2 + I2 (Basic)How to balance this Redox Reaction???? |
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| 2. |
Name three metals that do not lose hydrogen when react with acid |
| Answer» Fe, Cu, Ag | |
| 3. |
What is the main difference in the origin of cathode rays and anode rays |
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| 4. |
Calculate the number of photons emitted in 10 hours by a 60 W sodium lamp? |
| Answer» E=hv, E=3.13×10^-19 power of lamp=60 watt, E=3.313×10^-19 photons emitted in one second=60×10^19/3.313=1.81×10^20" in 10 hours (1.81×10^20×3600×10)=6.5160×10^24 photons emitted | |
| 5. |
What is volume strength. How to find volume strength. Give me the formula |
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| 6. |
Practicle for class 11 salt for |
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| 7. |
Can this be done in Hindi language online all PCM side |
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| 8. |
Advantages and disadvantages of bhor\'s atomic model? |
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| 9. |
What is covalent band |
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Answer» The bond is formed by mutual sharing of electron b. w two or more atoms Covalent bond means sharing of electron pair between atoms. It is also known as molecular bond |
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| 10. |
what is grams law |
| Answer» This law state that the condition of Temp., press,the rate of diffusion of gases r inversely proportional to the square root of their density. | |
| 11. |
State hund\'s maximum multiplicity rule |
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Answer» All the available orbitals of given subshell contain one electron with parallel spin. All the available orbitals of given subshell contain one electron with parallel spin Firstly single electron is filled then 2nd electron is filled Yes, firstly the electron filled in lower energy orbital then in higher energy orbital |
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| 12. |
Why are atomic mases of elements the average value? |
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| 13. |
How to find bond angle of an compounds? Is there any formula to find bond angle |
| Answer» No but chart available in ncert book | |
| 14. |
The mass of can sugar required to prepare 500 g of 25%cane sugar solution is |
| Answer» Mass percent25=mass of sugar/500×10025=mass of sugar/5125g =mass of sugar | |
| 15. |
To prepare 250ml of m/10 solution of oxalaric acid from crystaling oxaric acid |
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| 16. |
Postulates of Rutherford |
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| 17. |
Zero law of thermodynamics . explain it plzzzz.. |
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Answer» to simplyfyif a=b and b=c then a=b=c The zeroth law of thermodynamics states that if two thermodynamic systems are each in thermal equilibrium with a third, then they are in thermal equilibrium with each other specify the properties needed to describe the state of a thermodynamic system answer this question |
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| 18. |
What is gibbse free energy?? Plzzzz answer I need it .... |
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Answer» NCERT explains it better than me...................just try to read 3 times gibbs free energy is "usefull work done" denoted by \'G\'. for example: in electrolysis of water H2 and O2 will be given out, in this the non mechanical work done i.e electricity given is G\xa0 Energy associated with Chemical rxn to do work |
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| 19. |
How can protium exist without having neutron in it??? |
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| 20. |
What is isomerism??? Difference between istope and isomers |
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Answer» isomers have same molecular formula but different structuresand,isotopes are elements with the same atomic number but different mass numbers Isomerism is a phenomenon whereby certain compounds with the same molecular formula but have different structures |
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| 21. |
Calculation of molecular mass of NH2coNH2 |
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| 22. |
Relationship between enthalpy and entropy |
| Answer» Enthalpy (H) is defined as the energy released or absorb during a chemical reaction.Entropy (S) define the degree of randomness or disorder in a system∆G= ∆H - T∆SFor a system in equilibrium, ∆G=O∆S = ∆H/T | |
| 23. |
Can you give sime sample papers for half book of chemistry for preparation |
| Answer» Consult helping books sir | |
| 24. |
BF3 molecule is polar or nonpolar .give reasons. |
| Answer» BF3 is non planer and also trigonal planer shape and is symmetrical with all respects. And no contain free unpaired electron because Florine is very electro negative dipole moment is 0.Since fluorine is more electronegative than boron,each B-F bond in BF3 is polar and three bond moments are equal. However the symmetry of trigonal planer shape means that the three bond moments exactly cancel one another. Thats why it is non polar because net diople moment is 0. | |
| 25. |
Define orbit |
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Answer» it is path where the electron are moving . Path where planets planets and sun revolve |
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| 26. |
Explain about formal charge and valence bond theory |
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| 27. |
Resonance structure of aniline |
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| 28. |
Find out the volume of o.2 mole of so2 at STP |
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| 29. |
Ttttgsheje |
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| 30. |
what is modern preodic law |
| Answer» It state\'s that all physical and chemical properties are the periodic function of their atomic number ?? | |
| 31. |
Describe the shape of BF3 and [BF4] minus |
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| 32. |
Define static equilibrium.... |
| Answer» When forces acting on object which is at rest are balanced ,then we say object is in state of static equilibrium. the resultant of these forces equal to zero. | |
| 33. |
What is conjugation? |
| Answer» a conjugated system is a system of connected p-orbitals with delocalized electrons in molecules with alternating single and multiple bonds, which in general may lower the overall energy of the molecule and increase stability. | |
| 34. |
Barometer |
| Answer» A device used to measure presure | |
| 35. |
What is the density of flourine at S.T.P. (molar mass F=38)? |
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| 36. |
What is the unit of R |
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| 37. |
What is the major difference between ionization enthalpy and lattice entlapy |
| Answer» Lattice enthalpy is a measure of the strength of an ionic compound. Whereas, ionization enthalpy is the amount of energy required to remove an electron from an atom. | |
| 38. |
zinc chloride is soluble in organic solvents but magnesium chloride is not soluble.Why? |
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| 39. |
What is first law of yehiThermo dynamics |
| Answer» It states that energy niether be created nor be destroyed. | |
| 40. |
Advantages of hybridization |
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| 41. |
What are the common factors of vsepr theory |
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| 42. |
What is difference between precision and accuracy |
| Answer» Accuracy refers to how close a measurement is to the true or accepted value. Precision refers to how close measurements of the same item are to each other. Precision is independent of accuracy. | |
| 43. |
Chemical formula of glucose |
| Answer» C6H12O6 | |
| 44. |
Write conjugate base of hcl |
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| 45. |
Why oxidation state of CO is 0 |
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| 46. |
How is it possible to have an atom with out having neutron??ex-protium |
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| 47. |
Why is the colour of foam formed by water is always white even if the water is black? |
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| 48. |
use the molecular orbital energy level diagram to show N2 woulike be expected to have a triple bond |
| Answer» in the electronic configuration of N2 there will be 10 electrons in bond pair and 4 electrons in antibonding pair. Therefore, the bond order will be = 1/2(10-4)= 3therefore N2 will have a triple bond | |
| 49. |
How many. Pie bond signa bond in ch3 ch2 ch2 ch3 |
| Answer» 10 sigma bond and 0 pie bond | |
| 50. |
Why nh3 has more dipole moment than nf3 |
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Answer» Dipole moment of NH3 is higher than NF3 molecule. This is due to the fact that dipole moment is a vector quantity and hence resultant dipole moment in a molecule will depend upon the direction of dipole moments of individual bonds. Nitrogen has a lone pair of electrons and is more electronegative than hydrogen. So, in case of NH3, the orbital moment due to the lone pair of electrons on nitrogen is in the direction of lone pair of electrons is in the same direction of the 3 N-H dipoles. Thus, the molecule has a net dipole moment and it is polar.In NF3, Florine being more electronegative than Nitrogen pulls the shared pair of electrons of the N-F bonds towards itself. Because of this, the orbital moment due to lone pair of electrons and the resultant dipole moment of 3 N-F bonds point in the opposite directions to that of lone pair of electrons. This lowers the dipole moment of NF3. In both molecules i.e., NH3\xa0and NF3, the central atom (N) has a lone pair electron and there are three bond pairs. Hence, both molecules have a pyramidal shape. Since fluorine is more electronegative than hydrogen, it is expected that the net dipole moment of NF3\xa0is greater than NH3. However, the net dipole moment of NH3\xa0(1.46 D) is greater than that of NF3\xa0(0.24 D).Since in case of NF3\xa0, fluorine is more electronegative than nitrogen, so it will attract the shared pair of electron towards itself from nitrogen. As a result dipole due to all F is in opposite direction to the resultant dipole due to N-F bonds,therefore the net dipole decreases.In NH3, Nitrogen is more electronegative than H, so it will attract the shared pair of electrons towards itself.As a result dipole due to Nitrogen is in same direction as the resultant dipole moment due to N-H bond& hence the net dipole increases.Hence, the net dipole moment of NF3\xa0is less than that of NH3. |
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