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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. |
Plss give me answers |
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Answer» gas produced as effervescence in big test TUBE is CO2 or carbon dioxide b) bubbles are seen in the small test tube as there is higher pressure in big test tube due to release of CO2. this gas travels through the delivery tube into the LIQUID in small tube HENCE forming bubbles.c) the CHANGE of color of limewater is that it becomes white and milky.eqn-CA(OH)2 + CO2 - CACO3 + H2Ohope it HELPS plz mark as brainliest |
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| 2. |
How does termaric change its colour in alkin media |
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Answer» ors LIKE turmeric CHANGE their COLOR when the pH changes. ... However, when it is exposed to alkaline substances, which have a pH greater than 8.6 and contain more hydroxide ions than the hydrogen ions, it turns into dark pink or RED in color. HOPE IT WILL HELP YOU |
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| 3. |
How to find the unknown elements in periodic table? |
| Answer» TELL which ELEMENTS are UNKNOWN in PERIODIC table ? | |
| 4. |
Hii friends.......... Plz help me with this.... Its urgent.. 10 examples of sp2 hybridisation... |
| Answer» IVE U 2 EXAMPLES, LIKE C2H4 and BF3.hope it helps... | |
| 5. |
Plz solv problem no 4 |
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Answer» 'b'is the answer.But PLEASE confirm.I am not sure.Please don't be WRONG in EXAMS |
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| 6. |
Theory involved in titration of strong,weak and very weak acid and bases |
| Answer» ACIDS =high concentration of H+ ION WEAK acids =low concentration of H+ ionvery weak acids=very low concentration of H+ IONS | |
| 7. |
What is the temperature in which mercury become solid.? |
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Answer» won't CHANGE into SOLID at any TEMPERATURE |
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| 9. |
100 atom of a element weigh 3900a.m.u. identify the element |
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Answer» it will be FERMIUM |
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| 10. |
Functional group and molecular formula of Ethanol |
| Answer» NAL GROUP - ALCHOHOL and MOLECULAR FORMULA is CH3-CH2OH | |
| 11. |
Why is ammonium nitrate not used in laboratory preparation of ammonia??? |
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Answer» is USUALLY prepared in the lab by heating a mixture of DRY slaked lime and ammonium chloride. Ammonium nitrate is not used because it decomposes to nitrous oxide (laughing GAS) on heating |
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| 12. |
What is the formula for electricity |
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Answer» R and the power LAW equation (formula): P = I × V. P = power...if u like it pls MARK as BRAINLIST |
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| 13. |
How slaked lime can be reacted with water |
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Answer» acts readily with water to produce slaked lime, which is the chemical compound CALCIUM hydroxide. A considerable amount of HEAT ENERGY is released during this reaction. Calcium hydroxide is sparingly soluble in water producing an alkaline solution known as limewater |
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| 14. |
Distinguish between propanone and tertiary butyl alcohol |
| Answer» NE will respond to HALOFORM TEST while the latter won't. | |
| 15. |
Which is the mist reactive element found in nature? |
| Answer» E is the answer becauseit has the LOWEST electronegativity of all ELEMENTS. This means it PULLS you electrons TOWARDS it stronger than any other element. | |
| 17. |
Mention the demerit of Dobereiner law |
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Answer» in demerit is that it was applicable only up to CALCIUM.After calcium every 8TH ELEMENT possesses different CHEMICAL properties than the FIRST element.Hope it helps....if so..please mark as brainliest |
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| 18. |
Which is reactive for electrophilic aromatic substitution? |
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Answer» is REACTIVE for ELECTROPHILIC aromatic substitution because it is ACT as a nucleophilic. |
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| 20. |
Is the hydroxylation of ethylene is an elimination reaction? |
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Answer» organic elimination reactions, at least one HYDROGEN is lost to form the double bond: the UNSATURATION of the molecule INCREASES. ... An important class of elimination reactions is those involving alkyl halides, with good LEAVING groups, reacting with a Lewis base to form an alkene. |
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| 21. |
Take an iron rod heat it on a flame observe the change in colour what colour do you observe initially ?what type of spectrum is formed? Explain |
| Answer» OLOR SPECTRUM FORMED | |
| 22. |
300 ml of a gas at 27 degree celsius is equal to -3 degree Celsius at constant pressure then final volume is |
| Answer» AL VOLUME is 270 ML. | |
| 23. |
Which compound is not prepared by wurtz reaction and why? |
| Answer» ITE ⭐⭐✨✨^_^:-(:-(:-(:-(:-(:-(:-(:-(Your answer :-):-):-):-):-):-):-):-):-)::-):-)$$$${{{{{{{{{{. R-X + 2Na + X-R → R-R + 2NaX in presence of dry ether. Hence methanecannot be prepared from Wurtz reaction. Because wurtz rxn preparesymmetrical alkanes butunsymmetrical alkanes can be prepared in mixture. In wurtz rxn two molecules of ALKYL HALIDES react to produce alkanes but Methane is a single carbon MOLECULE }}}}}}}$$$$$$$$£££££&&&&&&&&&&+££Hope Help your ££££££&&&&&&&&&+£££???((((@@((☝️☝️☝️please BRAINLIEST this answer☝️☝️))))))??????????????????☘️??????????☝️✨?????????????????????????????????????????☝️^_^✨☝️??????????????????? | |
| 25. |
on passing excess co2 through lime water it first turns milky and then become colourless. explain why ? write the chemical equation |
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Answer» +CO2 -----> CaCO3+H2O |
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| 26. |
'Sea water does not freeze at 0 degree celcius.'Why? |
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Answer» ater freezes at a LOWER temperature than freshwater. ... Freshwater freezes at 32 degreesFahrenheit but seawater freezes at about 28.4 DEGREES Fahrenheit , because of the SALT in it. Whenseawater freezes, however, the ICE contains very little salt because only the water PART freezes. |
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| 27. |
'Water pipes burst in severe winter.'Why? |
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Answer» e..!!Here's Your ANSWER..!!Water in pipes usually FREEZES during winters.We know that water expands on freezing.When the water present in pipes, freezes and does not get space to expand, it BURSTS the pipe open.Hope This HELPS..!!#BeBrainly❤️ |
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| 28. |
A substance x when reacted with an acid produced hydrogen gas. What is the nature of x |
| Answer» BASE. it is BASIC in NATURE. | |
| 29. |
2Pb（NO3）2 ------heat----- 2PbO +2NO2 + O2 Explain how this is an endothermic reaction |
| Answer» VOLVES energy in the FORM of heat PRESENT in the the SURROUNDING, it is endothermic reaction | |
| 30. |
Only compressibility diagram |
| Answer» UNDERSTAND your QUESTION what is QUESTIONS here | |
| 32. |
Why uv a rays r larger than uv b rays? |
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Answer» s also play a role in skin cancer formation. In addition, the UVA rays penetrate more DEEPLY into the skin and play a GREATER role in premature skin aging changes including wrinkle formation (photoaging). There are approximately 500 times more UVA rays in sunlight than UVB rays. Therefore, in addition to protecting your skin from the effects of UVB rays, it is also very important to PROTECT from the damaging effects of the more numerous UVA rays. Traditional chemical sunscreen products have been more SUCCESSFUL at blocking UVB rays than UVA rays. |
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| 33. |
10 l of hard water required 0.56 g of lime (cao) for removing hardness. Hence, temporary hardness in ppm (part per million, ) of is: |
| Answer» | |
| 34. |
The ratio r* : w is 0.42 . The co-ordination number of cation is? |
| Answer» ORDINATION NUMBER is 6. | |
| 35. |
Out of molality and molarity which is a better method of expressing concentration |
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Answer» lality SINCE it's TEMPERATURE INDEPENDENT. |
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| 36. |
Which has more atomic radius is it magnesium or magnesium ion? |
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Answer» um atom RADIUS is more than the radius of MAGNESIUM positive ION |
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| 37. |
The process by which water,wind ice and changes in temperature break down rock into fragments is called sediments |
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Answer» this SEDIMENTS are COMING KNOWN to be SOIL.THANKING YOUADARSH |
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| 38. |
Which charge in zinc |
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Answer» tomic number of zinc is 30 meaning that its NUCLEUS contains 30 protons. Zinc most commonly FORMS positively charged cations with a charge of +2. Zinc will rarely FORM IONS with a +1 charge but it will never form ions with a NEGATIVE charge. |
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| 39. |
Which charge in sulfur |
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Answer» ur with electron configuration of 2,8,6 in its OUTER valance shell will need to GAIN TWO electrons to get 8, and have a stable outer shell. This will mean there are 2 more electrons then protons and the OVERALL ion will have a negative charge. |
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| 40. |
The contraction of hydrogen ion in a sample paper soft dark is 3.8×10^-3 M. What is its pH ? (log 3.8= 0.5) Answer fastly. |
| Answer» | |
| 41. |
Give an example of 1.monovelent cation2.biovelent cation 3.monovelent anion4.biovelent anion. |
| Answer» ENT ANION ➡️Chloride anion, FLUORIDE anion - CL- , F-Divalent anion ➡️ oxide O2- , sulphide S2-Monovalent cation ➡️potassium and sodium anion - K+ & Na+Divalent ➡️Ca2+ , Mg2+ | |
| 42. |
What are colloids I'm chamistry? |
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Answer» s are SMALL homogeneous LOOKING HETEROGENEOUS mixturethese particle SHOW tyndall effect,electrophesis,and brownion movement .its size is 10^7-10^9. |
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| 44. |
40 g of sugar is dissolved in 250 ml of solution calculate the concentration of the solution in terms of mass by volume percentage of solution |
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Answer» /250×100=16%. |
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| 45. |
List observations of acetic acid to phenol phthalein |
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Answer» enolphthalein, which is an ACID-base indicator, is dissolved in ACETIC acid (present in vinegar) the SOLUTION TURNS pink in COLOR. |
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| 46. |
What is the temparature of mercury change in solid? |
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Answer» won't CHANGE into SOLID at any TEMPERATURE |
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| 47. |
The reaction of co2 with this carbonic anhydrase enzyme is an example of |
| Answer» | |
| 48. |
Optically active nitric acid is named as d tartaric acid because it has positive |
| Answer» | |
| 49. |
The number of faraday's needed to reduce 4 gram equivalent of cu 2 + to cu metal will be |
| Answer» 126 FARADAY REQUIRED. | |