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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. |
Q11. Find the empirical formula of the compound having 80% of Cu and 20% of S. |
| Answer» n (Cu) = 80 / 63 = 1.26// n (S) = 20 / 32 = 0.625// Ratio = 1.26 : 0.625 = 2:1 (approx.) Therefore, empirical formula of compound is Cu2S. | |
| 2. |
Sum of fraction is one. Mole fraction of water and sodium hydroxide would be? |
| Answer» | |
| 3. |
A mixture contain 30% NA.How many moles of sodium present in the mixture? |
| Answer» Suppose Out of 100g ,30g is NAThen, atomic mass = 23Mole = 30/23 =1.3 mole (approx) | |
| 4. |
What is the stable state of aggregation of hydrogen |
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| 5. |
What weight of ch4 should be taken which contains 2.4 ×10²⁴ atom of H |
| Answer» 16 g = 4 H × 6.022 × 10^23.X g = 2.4 × 10^24. Therefore, X = 2.4 × 16 × 10^24 / 4 × 6.022 × 10^23 = 15.94 g. // | |
| 6. |
What is shelding effect? |
| Answer» In case of big atoms like Sulphur and Potassium, the electrons in outer shells is not given a significant part of the effective nuclear charge of the atom due to the inner electrons. This is called SHIELDING EFFECT. | |
| 7. |
Calculate the number of molecules in 20 g aluminum sulphate |
| Answer» Molar mass of Al2(SO4) 3 = 2(27) + (32 + 64) 3 = 54 + 288 = 342 g. //No of molecules = (20/342) × 6.02 × 10^23 = 0.352 × 10^23 molecules// | |
| 8. |
Types of chemical reaction in chapter 12 |
| Answer» Uu | |
| 9. |
The first ionization enthalpy of O is less than N. Why ? |
| Answer» Electronic configuration of O = 1s2 2s2 2p4 and that for N = 1s2 2s2 2p5. Here, in N, the 2p subshell already has a HALF FILLED electronic arrangement unlike in O. This ensures greater stability for N atom than for O atom and thus, ionisation enthalpy (energy required to remove outermost electron) for O becomes lesser in magnitude than that for N. | |
| 10. |
The first ionization enthalpy of B is less than first ionization enthalpy of Be . Why? |
| Answer» Be has an Electronic configuration of 1s2 2s2 and B has an electronic configuration of 1s2 2s2 2p1. The p 2p orbital, causing lesser shielding effect than 2s orbital, would be able to loose an electron much more easily than 2s orbital. Hence, Be has greater ionization enthalpy than B. | |
| 11. |
Explain isomerism. |
| Answer» Phenomenon in which more than one compound have same chemical formula but different chemical structure is different | |
| 12. |
write the formulas for calculating the radii and energy of stationary states |
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Answer» The Bohr\'s energy of a stationary state of the hydrogen atom is given as En\u200b=n2h2−2πme4\u200b. -2π^2me^4/n^2h^2 |
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| 13. |
What is important I\'m chemistry |
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Answer» Because it is so fundamental to our world, chemistry plays a role in everyone\'s lives and touches almost every aspect of our existence in some way. Chemistry is essential for meeting our basic needs of food, clothing, shelter, health, energy, and clean air, water, and soil. Because it is so fundamental to our world, chemistry plays a role in everyone\'s lives and touches almost every aspect of our existence in some way. Chemistry is essential for meeting our basic needs of food, clothing, shelter, health, energy, and clean air, water, and soil. |
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| 14. |
Chemical formulae with their molecular mass |
| Answer» M = m / nM = molar massm = mass of a substance (in grams)n = number of moles of a substance | |
| 15. |
Que no 1 |
| Answer» | |
| 16. |
To which block the element in the periodic table 3d10 4s2 belongs? |
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Answer» Do block D block 3d10 4s2 is for ZINC (Zn). It belongs to the d block. Answer is d block Hey dear friend.....??? |
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| 17. |
Convert pentane to pentane chloride |
| Answer» Uo | |
| 18. |
When MnO4- react with H2O2 in basic medium the following species are involved except |
| Answer» [MnO4-]→[Mn2+] and H2O2 → O2. | |
| 19. |
for sodium atom number of electrons with m=0 will be |
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Answer» I mean, 7 electrons 2 electrons. |
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| 20. |
How to learn chemistry easy to way second term exam .....?? |
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Answer» Do ncert again and again Use Method: :(5 Steps) 1) Read and understand ch along with its concepts2) Solve NCERT examples and exercises3) Separately revise each topic in points4) Separate theory explanation and Definitions, derivations5) Accordingly, prepare markswise, chapter wise, subjective Questions from refresher, if in class 10,12, use previous 5 years Sample and Board Question paper |
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| 21. |
Chlorination of methane |
| Answer» CH4 + Cl2 --- hυ and 573 - 773 K ---→ CH3Cl + HCl. Repeat the same 3 times to get CCl4 + 3HCl. | |
| 22. |
Name the reaction of magnesium with water |
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Answer» Magnesium oxide Mg(s) + 2H2O(l) → Mg2+(aq) + 2OH-(aq) + H2(g) Irreversible Chemical Reaction |
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| 23. |
Oxidation list |
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| 24. |
Anti markovnikov rule |
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Answer» Anti markovnikov rule describes that in addition to reactions of alkenes or alkynes,the proton is added to carbon atom that has least number of hydrogen atoms to it. Anti Markovnikov rule describes that\xa0in addition to reactions of alkenes or alkynes,\xa0the proton is added to the carbon atom that has the least number of hydrogen atoms attached to it. |
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| 25. |
-OCH3 group_______ the benzene ring towards electrophilic substitution reaction |
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| 26. |
How to control exhaustive chlorination? |
| Answer» | |
| 27. |
Practical of term 2 class 11 |
| Answer» | |
| 28. |
Ethanoic to benzene |
| Answer» | |
| 29. |
Can equimolar mixture of HCl and NaCl behave as a buffer ? Explain your answer |
| Answer» | |
| 30. |
Mam / sir can you give me sample paper |
| Answer» | |
| 31. |
Experiment of bending a test tube And cutting of test tube? |
| Answer» | |
| 32. |
Define parcial pressure |
| Answer» When pressure is exerted by individual gas is called partial pressure | |
| 33. |
Do we have to balance the equation required while calculating enthalpy change? |
| Answer» Yes | |
| 34. |
Formula of calcium dichloride |
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Answer» Cacl2 This content has been hidden. One or more users have flagged this content as inappropriate. Once content is flagged, it is hidden from users and is reviewed by myCBSEguide team against our Community Guidelines. If content is found in violation, the user posting this content will be banned for 30 days from using Homework help section. Suspended users will receive error while adding question or answer. Question comments have also been disabled. Read community guidelines at https://mycbseguide.com/community-guidelines.html Few rules to keep homework help section safe, clean and informative. Don\'t post personal information, mobile numbers and other details. Don\'t use this platform for chatting, social networking and making friends. This platform is meant only for asking subject specific and study related questions. Be nice and polite and avoid rude and abusive language. Avoid inappropriate language and attention, vulgar terms and anything sexually suggestive. Avoid harassment and bullying. Ask specific question which are clear and concise. Remember the goal of this website is to share knowledge and learn from each other. Ask questions and help others by answering questions. CaCl² Cacl2 |
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| 35. |
What is the need to do cathode ray experiment? |
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Answer» My homework is complete Cathod rays experiment was showed that the all atoms contain negatively charged particles or electrons |
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| 36. |
Next chapter???? |
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| 37. |
What is responsible for men |
| Answer» | |
| 38. |
Sandmeyer reaction |
| Answer» | |
| 39. |
First low of thermodynamics |
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Answer» Energy can neither be created nor be destroyed in a chemical or physical change. Energy can neither be create nor be destroyed in chemical reaction but transfer from one to another form dQ=du+w ∆Q=∆u+w ∆Q=∆u+w Energy can neither be created nor be destroyed in chemical reaction ∆Q=∆U+W ∆Q=∆U+W The energy of isolated system is çonstant i.e. ∆u=q+w |
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| 40. |
Explain hydration enthalpy ? |
| Answer» The enthalpy change in any compound when it dissolve in water or any solvent | |
| 41. |
Calculate the solubility of A2X3 in pure water.the solubility product of A2X3 is 1.1×10 |
| Answer» | |
| 42. |
Hello discuss chemical properties of caO,(caOH)2, CaCo3 |
| Answer» | |
| 43. |
How much part of water in HCOH |
| Answer» HCOH-H2O+C | |
| 44. |
Symbol E nod represent what |
| Answer» Electrode potential | |
| 45. |
What is Bomb calorimeter?? |
| Answer» | |
| 46. |
What are conjucate acid base pairs? Give two example |
| Answer» | |
| 47. |
How to rite Lewis structure |
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Answer» 1. Find the total no of valence electrons. 2. Find the no of electrons to make the atoms fulfil. 3. Determine the no of bonds in the molecules. 4.choose a central atom. Just draw vakence electrons around atom . Lewis structures (also known as Lewis dot diagrams, Lewis dot formulas, Lewis dot structures, and electron dot structures) |
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| 48. |
What is diprotium |
| Answer» Term of organic chemistry. Diprotium is the normal molecular hydrogen H2. | |
| 49. |
What is the pentavalency of carbon? |
| Answer» 0 | |
| 50. |
Why Al radius is greater than the Ga radius? |
| Answer» | |