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. |
atom has a configuration 2,8,7 a) name the group and period to which belongs . b) out of there which elements are chemically similar N(7) , F(9), P(5) |
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Answer» is chlorineit BELONGS to 17th group and 3RD periodF(9) is CHEMICALLY SIMILAR |
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| 3. |
What is the limiting factor in the production of large quantities of ethanol as biofuel is |
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Answer» your QUESTION?Secondary SchoolChemistry 13 pointsThe limiting factor in the production of large quantities of ethanol as biofuel isAsk for details Follow Report by Abhay568 3 days agoAnswersMe · BeginnerKnow the answer? Add it here!AniketastronautAniketastronaut AceA biofuel is a fuel that is produced through CONTEMPORARY biological processes, such as agriculture and anaerobic digestion, rather than a fuel produced by geological processes such as those involved in the formation of fossil fuels, such as coal and petroleum, from prehistoric biological MATTER. If the source biomatter can regrow quickly, the resulting fuel is said to be a form of renewable energy.Biofuels can be derived directly from plants (i.e. energy CROPS), or indirectly from agricultural, commercial, domestic, and/or industrial wastes.[1] Renewable biofuels generally involve contemporary carbon fixation, such as those that occur in plants or microalgae through the process of photosynthesis. Other renewable biofuels are made through the use or CONVERSION of biomass (referring to recently living organisms, most often referring to plants or plant-derived materials). This biomass can be converted to convenient energy-containing substances in three different ways: thermal conversion, chemical conversion, and biochemical conversion. This biomass conversion can result in fuel in solid, liquid, or gas form. This new biomass can also be used directly for biofuels |
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| 4. |
A cubical vessel has a side with'1' cm length contained a pressure 'p 'when the side of the vessel is |
| Answer» ESSEL (with face horizontal + vertical) contains an ... 1 MOLE of an ideal gas is contained in a CUBICAL volume V, ... P = Pressure of gas, N = Number of moles | |
| 5. |
How can test unsaturation. |
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Answer» for UNSATURATION. Bromine water is a dilute SOLUTION of bromine, NORMALLY orange-brown in colour. It becomes colourless when shaken with an ALKENE, but its colour remains the same when it is shaken with ALKANES. |
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| 6. |
Please answer my questions fast because I have my exam tomorrow!! The question is, |
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Answer» .2,8,63.Argon4.HCl5.Halogens FAMILY |
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| 7. |
See here why propyl came ? |
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Answer» e 5 TH c atom drop 3 carbons. With the second org the 3 c atoms ATTACH 2 methyls.. So it becomes 2,2-dimethyl PROPYL.... And since it drops from the 5 th CARBON of the 9 carbon chain, it becomes 5-(2,2-dimethyl propyl) nonane |
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| 8. |
Something that causes a reaction or promotes activity is called |
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Answer» alled as a REAGENT. |
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| 9. |
If an element has mass no. 27 and atomic no. 13, how many neutrons does this atom contain |
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| 10. |
Why dont detergents form scum? |
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Answer» nts DONT form SCUM in hard WATER because it does not form a WHITE precipitate when it reacts with the Ca and MG ions present in hard water |
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| 11. |
How to sell on Amazon |
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Answer» d to GET the GST no. from the GOVERNMENT to register ur company then you may call at the AMAZON helpline no. to proceed further !! |
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| 12. |
Sayetsaf reaction vs hoffmann reaction of elemination reaction |
| Answer» GIVE you the BEST MECHANISM of the REACTION on MORNING | |
| 13. |
2 ml of sodium hydroxide solution is added to the basis of granulated zinc mental taken in a test tube when the |
| Answer» DIUM HYDROXIDE is reacted with zinc metal then sodium ZINCATE and HYDROGEN gas will form | |
| 14. |
Difference between a true solution and a homogeneous solution?(Any five) |
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| 15. |
What is saponification reaction and write their 10 uses in daily life |
| Answer» SED in CLEANING ACTION of SOAP too. | |
| 17. |
Define ionic bond .Explain the factors that influence the formation of an ionic bond with suitable examples. |
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Answer» rmed by the mutual attraction of ION called ionic bond.1> electrostatic force2>strong NUCLEAR forceex FORMATION of Nacl SOLUTION |
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| 18. |
All activity of chapter2 Class 10 |
| Answer» CH SUBJECT do U WANT the ACTIVITIES for??? | |
| 19. |
The test used to distinguish alcohols from one another is known as Lucas test |
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Answer» have GIVEN the RIGHT INFORMATION |
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| 21. |
a watch is marked in such a way that after allowing a discount of 10% gain is 26% how much percent above the C.P. is the Marked price |
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Answer» s Yoᴜʀ Aɴsᴡᴇʀ⚑▬▬▬▬▬▬▬▬▬▬▬▬☟▶LET the, ➧ CP = 100➧ SP = 100 +19➾ 119➧ Let the marked price be x.➧ Then, 85 % of x = 119➾ 85 / 100 × x➾ 119➧ x = 119 × 100 / 85➾ 140➧ So, Marked price is➾ 40 % ...✔Hope it HELPS you!! |
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| 22. |
To find the acid contents in fruits like lemon,tararind,tomato,orange,sweet lemon,wetc |
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Answer» WITH LITMUS PAPER IF THE BLUE LITMUS TURNS RED THEN IT SURELY HAS ACID INIT |
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| 23. |
What is the reaction of the preparation of toluene from phe nol? |
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Answer» with zince DUST gives BENZENE. Benzene on friedal CRAFTS ALKYLATION gives toluene. |
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| 24. |
Yield of crystals of potash alum |
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Answer» hijklmnopqrstuvwxyz |
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| 25. |
Give explanation the presence of base is needed in the ammonolysis of alkyk halides |
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Answer» e is just to remove the H+, which would otherwise convert your NH3 to NH4+ which does not have a lone PAIR and would not react. Without the base, you would need twice as MUCH ammonia. A strong base could also convert part of the NH3 to NH2-, which would be a much stronger NUCLEOPHILE. |
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| 26. |
2 test tube contains dry hcl and dilute hcl respectively which is more acidic . why |
| Answer» HCL is less acidic as there is no water acids SHOW their acidic character only in presence of water so dilute is more acidic in this CASE | |
| 27. |
Find odd man melting of ice,salt dissolved in water,ripening of fruit,solution of glucose powder |
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Answer» of ice because it is SPONTANEOUS process, that can be REVERSED. Hope this will HELP you!! |
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| 28. |
पेट्रोल किसका मिश्रण है ? |
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Answer» कार्बन का..............MARK MY ANSWER AS BRAINLIEST YRR PLZ |
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| 29. |
In potasaium how many valence elctron are present in n shell |
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Answer» ssium 1 ELECTRON is PRESENT in N shell.the CONFIGURATION is 2,8,8,1 |
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| 31. |
Only carbon dioxide is necessary for photosynthesis |
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Answer» y carbon DIOXIDE is not necessary for PHOTOSYNTHESIS. Water and SUNLIGHT are ALSO necessary |
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| 32. |
One atom of element weigh 6.643×10^-23g.No of moles in 20kg is |
| Answer» ATOM: 6.643×6.023 = 40So, 1 MOLE = 40gmHence x mole = 20,000So, x = 20,000/40 = 500 MOLES. | |
| 33. |
For a reaction r ––→ p, half-life (t1/2) is observed to be independent of the initial concentration of reactants. What is the order of reaction ? |
| Answer» FIRST ORDER REACTION. | |
| 34. |
How to distinguish between benzoic acid and ethanol? |
| Answer» ACID will give effervescence with NA2CO3 while ethanol won't. | |
| 35. |
Define chemical rwins and write general electronic configuration of actinoids |
| Answer» L twins are those in which the properties of some elements are same. Atomic SIZE of ZR and HF , NB and Ta are similar. This is due to Lanthanide contraction.The configuration of actinoid is 5f0-14 6d0-2 7s2 | |
| 36. |
What plant is used to create acetaminophen |
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Answer» y it is not a plant.It is a COMPOUND of N-acetyl-para-aminophenol,which is further PROCESSED to MAKE DRUGS. |
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| 37. |
6gm of solid metal needs 11.2 L of oxygen to make a gaseous oxide. what is the vapour density of the produced gas? |
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| 38. |
Does inflammable substances have low ignition temperature? |
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Answer» lammable do not have LOW IGNITION TEMPERATURE... |
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| 40. |
Nitrogen atomic number 7 and phosphorus with atomic number 15 |
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Answer» mate,➡️the given STATEMENT is CORRECT that nitrogen's atomic number is 7 and PHOSPHORUS's Atomic number is 15.thanks....nice to help you ✌️✌️ |
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| 41. |
Short note on atomic size |
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Answer» size means it is the distance between the CENTRE of the nucleus of an atom and its outermost shell. ATOMIC size increases while MOVING down a group and atomic size decreases from moving left to right across a period. ........may this HELP u....... |
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| 43. |
Cation and anion of the following CaO, calcium chloride, NaOH, KOH |
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Answer» Calcium has a charge of +2... it is the cation. It REACTS with the anion, OXYGEN, which has a charge of -2. They cancel each other out. NaOH is an ionic compound. When it is dissolved in water the ions are solvated. With NaOH, the sodium ions are STABILISED by interaction with unshared electron pairs of water molecules, and the hydroxide ions are stabilised by hydrogen bonding of their unshared electron pairs with the partially positive HYDROGENS of water molecules.KOH = K+ OH- : Where k+ is cation and OH- is anionCalcium chloride is made of calcium ions (with 2 charges, Ca++) and chloride ions (with 1 charge only, Cl—). |
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| 44. |
On passing the gas A through B it turns milky name the compound . W Hf at happen if dry compound B reacts with the chlorine gas to form C |
| Answer» POUND is Calcium hydroxideWhen B REACTS with chlorine BLEACHING powder (CaOCl2) is formed.Hope this helpsPlease mark it as the BRAINLIEST | |
| 45. |
Which one will go sn1 reaction faster and how explain, i know the answer but i didn't undertood how |
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Answer» ond one obviously, because the CARBOCATION would be more STABLE by hyperconjugation as WELL as inductive effect. |
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| 46. |
Name the process in which a solid directly changes into vapour |
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Answer» SUBLIMATION is the process in which a SOLID DIRECTLY CHANGES from its solid state to VAPOUR state or GASEOUS form.eg- camphor , naphthalene |
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| 47. |
5g of calcium carbonate on complete decomposition gives off 2.2 g of carbon dioxide gas and X g of calcium oxide . calculate X . which law do you apply for the above calculation |
| Answer» E Law of Conservation of mass, the REACTANTS and the products have to be in equal amount.hence, Reactant is 5ggiving 2.2 g + X GFROM the law of conservation of mass5g = 2.2 + XX = 5 - 2.2X = 2.8 g | |
| 48. |
Radicals in chemistry for class 7 |
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Answer» Molecules and Radicals. ATOMS of the most elements are composed of STILL SMALLER particles known as fundamental particles or subatomic particles. Protons are the positively charged particles PRESENT in an ATOM |
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| 49. |
The gas formed when copper carbonate is heated strongly? |
| Answer» DIOXIDE is EVOLVED. CUCO3(s) ——heat——> CuO(s) + CO2(g)Hope this will help you. If you like my answer PLEASE mark it as brainliest And Be my follower if POSSIBLE. | |
| 50. |
Determine one cation and one anion in the given unknown organic compound l |
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Answer» containing organic compounds, a third family, may be divided into TWO main types: those that contain at least ONE C–O bond, which INCLUDE alcohols, phenols (DERIVATIVES of benzene), and ethers, and those that contain a carbonyl group (C=O), which include ALDEHYDES, ketones, and carboxylic acid |
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