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. |
Give one example where pressure is required for happening reaction |
| Answer» TURING Ice-creams REQUIRES PRESSURE. | |
| 2. |
If sin theta=3/5 theta is in first quadrant, then find sin theta/2 and cos theta/2 |
| Answer» ANS is in the picExplanation:HOPE it HELPS | |
| 3. |
th ph of rain witer collected from 2 different cities, A and B was found to be 6 and 5 respectively . The water of which city is more acidic? |
|
Answer» the WATER of city B is more acidic then city AExplanation:it is because the lower the PH SHOWS that it is more acidicplease mark this as BRAINLIEST answer |
|
| 4. |
The size of each particle in a true solution is same or not. |
| Answer» HEY guys I am so confused SORRY PLEASE marks as brainlist HELLO | |
| 5. |
Write 3 chemical properties of acid and base?fast |
|
Answer» acids. taste is soursmell FREQUENTLY burns NOSE texture is stickybasetaste is bitterusually their is no smelltexture is SLIPPERY |
|
| 6. |
A zinc rod is placed in 0.1M aqueous solution of ZnSO4. Hydrochloric acid is added to this solution. will there be evolution of H2 gas if concentration of H+ ions in solution is 10^-6M at 25°C. |
| Answer» HIII PLEASE FOLLOW me on BRAINLY | |
| 7. |
What are artificial sweetening agents? Given example |
|
Answer» Chemicals that sweeten food are called artificial SWEETENING agents. They do not add calories to our body. They do not harm our body. Examples INCLUDE aspartame, SACCHARIN, sucrolose and ALITAME |
|
| 8. |
What precautions should be taken while working with acids |
|
Answer» follow me MARK as brainestExplanation:Wear a chemical-resistant apron, chemical-resistant GLOVES and chemical splash goggles at all times when HANDLING HCl to PROTECT your eyes and skin. |
|
| 9. |
calculate lime and soda required for softening of 10000L of water sample having calcium hardness 450mg/l as CaCO3 magnesium 150mg/l as CaCO3 and total alkalinity=400mg/l as CaCO3. |
|
Answer» f x moles of NaCN have to be ADDED to 5 L of water to dissolve 0.5 MOLE Fe(OH)3 in the form of Fe(CN)6 then calculate the value of x/13.25 ( GIVEN: ksp of Fe(OH)3 is 2.7×10^-39 . KF =10^30 |
|
| 10. |
Hllw friends ♥️♥️✌Que- Why do we require artificial sweetening agents? |
|
Answer» Follow me Explanation:Why do we require artificial sweetening AGENTS? We require artificial sweetening agents as they are sweet in taste but they have no FOOD value. They go directly through the digestive tract without being digested. It helps diabetic patients to eat sweet food without ADDING any extra SUGAR in their body. |
|
| 11. |
Calculate the solubility product for BaCl2 if the concentration of BaCl2 is 6 mol/lt. |
| Answer» | |
| 12. |
Why does ice floats on water even though solids have more density than liquid ? Plzzz be clear and easy in ur words.. Don't write it in complicated way. |
|
Answer» in WATER there is anomalous behavior it means that the density decreases when it decreases from 4 DEGREE Celsius.so ice has less density hence it floats EXPLANATION: |
|
| 13. |
Classify the following reaction in displacement CaCo3 Cao + Co2 |
| Answer» LIME and SODA REQUIRED for SOFTENING of 10000L of water sample having calcium hardness 450mg/l as CaCO3 magnesium 150mg/l as CaCO3 and total alkalinity=400mg/l as CaCO3 | |
| 14. |
Give an example where pressure is required for happening the reaction |
|
Answer» THE EFFECT OF PRESSURE ON REACTION RATESThis page describes and explains the way that changing the pressure of a gas changes the rate of a reaction.The factsWhat happens?Increasing the pressure on a reaction involving reacting gases increases the rate of reaction. Changing the pressure on a reaction which involves only solids or liquids has no effect on the rate.An exampleIn the manufacture of ammonia by the Haber Process, the rate of reaction between the hydrogen and the nitrogen is INCREASED by the use of very high pressures.In fact, the main reason for using high pressures is to improve the percentage of ammonia in the equilibrium mixture, but there is a USEFUL effect on rate of reaction as well.Note: If you want to explore equilibria you will find the topic covered in a separate section of the site.The explanationThe relationship between pressure and concentrationIncreasing the pressure of a gas is exactly the same as increasing its concentration. If you have a given mass of gas, the way you increase its pressure is to squeeze it into a smaller volume. If you have the same mass in a smaller volume, then its concentration is higher.You can also show this relationship mathematically if you have come across the ideal gas equation:Rearranging this gives:Because "RT" is constant as long as the temperature is constant, this shows that the pressure is directly proportional to the concentration. If you double one, you will also double the other.Note: If you should be able to do calculations involving the ideal gas equation, but aren't very happy about them, you might be interested in my chemistry calculations book.The effect of increasing the pressure on the rate of reactionCollisions involving two particlesThe same argument applies whether the reaction involves collision between two different particles or two of the same particle.In order for any reaction to happen, those particles must first collide. This is TRUE whether both particles are in the gas state, or whether one is a gas and the other a SOLID. If the pressure is higher, the chances of collision are greater.Reactions involving only one particleThings get more difficult to explain if you have reactions involving something happening to a single particle rather than being caused by a collision between two particles. The relationship between pressure and rate is much more complicated and varies from reaction to reaction. This is beyond A level.Note: Up to May 2017, at this point I had a simplistic explanation here in terms of particle collisions and then, after 15 years of the page being on the web, someone pointed out that it was illogical! I apologise for that.There are theories which show that even for unimolecular reactions (reactions only involving one molecule) collisions are necessary in order for molecules to gain activation energy. If you want to know more about this, you will have to do chemistry to a higher level. You could google it, but you will find explanations are at a high level and QUITE mathematical.Explanation:Follow me ✌ |
|
| 15. |
A mixture zncl2 and phcl2Can be SpeperatbyDistillationGystallizationsunlimationAddiding aceticacid |
| Answer» CRYSTALLISATION is the ANSWEREXPLANATION:pls MARK me brainliest STAY SAFE stay happy | |
| 16. |
A process in which heat absorbed is 5J and work done by gas is 8J . What is internal energy |
| Answer» TION:Given that the work is done on the surrounding, i.e., the work is done by the system and the heat is absorbed by the system.Therefore,q=5kJw=8JNow from first law of THERMODYNAMICS,ΔU=q+w⇒ΔU=5+8=13JHence the CHANGE in internal energy is 13J | |
| 17. |
Check your progresswrite Nernst equation for the following cellrepresentation1) Mg / Mg 2+ (0.IM) // Ag+ (0.01M)/ Ag2) K / K+ (0.1m) // mg2+/mg3) write Nernst equation for the reactioncr+Fe2+=Cr3++ Fe |
|
Answer» 1356789rffhhmyuifc byhg25);_' 68 |
|
| 18. |
Explain Sodium Hydroxide salt plz answer fast |
|
Answer» A white corrosive SOLID compound that absorbs water and CARBON dioxide from the atmosphere and forms lye when in solution . SODIUM hydroxide is toxic and STRONGLY alkaline and is used to make CHEMICALS and soaps and to refine petroleum . |
|
| 19. |
Give one example of a reaction where light is necessary for happening the reaction? |
| Answer» PHOTOSYNTHESIS EXPLANATION:PLS FOLLOW and give brainliest mark | |
| 20. |
Write down the three properties if solid state of matter |
|
Answer» roperties of solid are.They do not have SPACE between particles.they does not flow.They are hard.They have MAXIMUM force of attraction between particles.There shape is FIXED.There VOLUME is ALSO fixed. |
|
| 21. |
1. Acids turn ............. litmus solution............. .2. pH of basic solution is always ............. than 7.3. ............. are the products obtained when bleaching powder reacts with dilute sulphuric acid.4. Potassium nitrate has pH value equal to ............. .5. ............. is the fixed number of water molecules chemically attached to each formula unit ofa salt in its crystalline form.6. ............. is one of the raw materials for the production of baking soda.7. The salts of a strong acid and weak base are ............. with pH value ............. than 7.8. Use of mild base like ............. on the bee-stung area gives relief.9. During indigestion the stomach produces too much ............. and this causes pain andirritation.10. The presence of ............. Ca in acids is responsible for their acidic properties.11. Mixing an acid or base with water results in decrease in the concentration of per unitvolume.This process is called12. Among HCl, H2SO4 and CH3COOH, ............. is a weak acid. * fill in the blanks |
| Answer» ANSWER 6) SODIUM CHLORIDE | |
| 23. |
[1] Which of the following statement is correct?(a) boiling is a bulk phenomenon and evaporation is a surface phenomenon(b) boiling is a surface phenomenon and evaporation is a bulk phenomenon(c) boiling and evaporation both are surface phenomenon(d) boiling and surface both are bulk phenomenonSERERBASISORDERKHUSHIEIEREEIEREPEPEESHERShtFORECAHljac |
| Answer» | |
| 24. |
Hellw Everyone ♥️✌ Que- With reference to which classification has the statement " ranitidine is an antacid " , been given ??????? |
|
Answer» 'Ranitidine is an ANTACID' is said with respect to pharmacological classification of drugs. Pharmacological classification divides the drugs according to their pharmacological effects on human BODY. Antacids are chemical substances which counteract (NEUTRALIZE) the effect of ACIDIC secretions in our stomach..... |
|
| 25. |
Equivalent volume of o2 gas at stp when it is produced by h2o2,is |
|
Answer» 20 volume H2O2 means that 1ml of this H2O2 will release 20ML O2 at STP. therefore decomposition of 15ML of 20volume H202 will give 15x20 = 300ml pls pls follow mepls pls MARK me as brainlist |
|
| 26. |
Write the chemical equation of a double displacement reaction |
| Answer» KOH + HCL - - - - - - >KCL + H2Oi HOPE it will help u☺☺ | |
| 27. |
Is sedimentation followed by decandation or decandation followed by sedimentation? pls give a proper explanation. |
|
Answer» decantation is always FOLLOWED by sedimentationExplanation:because decantation is the PROCESS in which the clear LIQUID is transfered to ANOTHER container WITHOUT disturbing the sedimentshope this helpspls mark as brainliest |
|
| 28. |
In the balanced reaction? XS+ YHNO3 -> ZH2SO4+mNO2+nH2O . The value of Y^2-X^2/Z+m |
|
Answer» To balance the NUMBER of iodine atoms, HI is multiplied with 2.Iodine is oxidized. Its OXIDATION state changes from −1 to 0. Net increase is +2.Sulphur is reduced. Its oxidation state changes from 6 to −2. Net decrease is 8.To balance the net increase and net decrease in the oxidation number, factor 4 is used. Thus, coefficients of HI and I 2 are multiplied by 4.To balance OXYGEN atoms, FOUR water molecules are required on the right.Thus, x=8, y=4 and z=4.Explanation:please mark me as branliest |
|
| 29. |
TheIlentify the oxidising agent infollowing3Fe + 4H20--- Fe3O4 + 4H2 |
| Answer» FE is being oxidised and H is redoxed.: h is the OXIDISING AGENT | |
| 30. |
Reason for the difference in properties of acids and bases: class 10 |
|
Answer» tion:Sure I will answer it for you MATE, Acids contain free H+ ionsBases contain OH- ionsAcids are sour in taste Bases are bitter in tasteI am also in 10 th classPlease mark it as brain list PLEASE please follow me too.. |
|
| 31. |
Maximum freezing point is known by 1m solution of NaCl Na2SO4GlucoseK4[Fe(CN)6] |
|
Answer» In the above formula 'Kfxm' value is same for both GLUCOSE and NaCl. Thus the deprssion in FREEZING point is more for NaCl. HENCE 1M glucose has higher freezing point. |
|
| 32. |
What is occulusion? |
|
Answer» αn σcclusíσn σccurs whєn sσmєthíng hαs вєєn clσsєd up σr вlσckєd σff. αlmσst αll hєαrt αttαcks αrє thє rєsult σf thє σcclusíσn σf α cσrσnαrч (hєαrt) αrtєrч вч α вlσσd clσt. whєn α pєrsσn's uppєr αnd lσwєr tєєth fσrm α mαlσcclusíσn, thєч clσsє íncσrrєctlч σr вαdlч. |
|
| 33. |
How to balance a chemical equation . |
|
Answer» Count the atoms of each ELEMENT in the REACTANTS and the products.Use coefficients; place them in FRONT of the COMPOUNDS as needed.Explanation:PLEASE mark as branlist |
|
| 35. |
How many grams of glucose can dissolve with water will be isotonic with blood at 37 °C |
| Answer» TION:π=8.21atm,T=273+37=310KWe KNOW,π=CRT8.21= M×1m ×0.082×310m= 0.082×3108.21×180 m=58.13gPlease mark me as brainliest if it HELPS and follow me | |
| 36. |
Suppose an examiner give you different mixtures and ask you to differentiate between salts and compounds.What are method you want to identify mixtures |
|
Answer» I can identify the salts by its SMELL , nature LIKE crystalline or amorphous and then by its texture, COLOUR etc. whereas if it is a compound, then its is also a mixture of ELEMENTS. But in this CASE, it lacks the properties of salt. so , I identify it accordinglyThank You |
|
| 37. |
Why milk is a colloidal solution? Explain. |
|
Answer» Milk is an emulsified COLLOID of liquid butterfat globules DISPERSED WITHIN a water-based solution.Explanation:PLEASE mark as branlist |
|
| 38. |
2.480 g of KClO3 are dissolved in conc. HCl and the solution was boiled. Chlorine gas evolved in the reactions was in then passed through a solution of KI and liberated iodine was titrated with 100 ml of hypo. 12.3 ml of same hypo solution required 24.6 ml of 0.5 iodine for complete neutralization. |
|
Answer» 0 g of KCLO3 are dissolved in CONC. HCl and the solution was boiled. Chlorine gas evolved in the reactions was in then PASSED through a solution of KI and liberated iodine was titrated with 100 ML of hypo. 12.3 ml of same hypo solution required 24.6 ml of 0.5 iodine for COMPLETE neutralization. |
|
| 39. |
How is the reaction between acid and metals different from the reaction between base and metal |
|
Answer» Acids react with most metals and, when they do, a salt is produced. But unlike the reaction between acids and bases, we do not get water. Instead we get hydrogen gas.This is the GENERAL word equation for the reaction:metal + ACID → salt + hydrogenFor example, magnesium reacts with hydrochloric acid to produce magnesium chloride:magnesium + hydrochloric acid → magnesium chloride + hydrogenMg + 2HCl → MgCl2 + H2It doesn't matter which metal or which acid is used, if there is a reaction we always get hydrogen gas as well as the salt. However, how quickly the reaction goes depends on the metal used and how high up in the reactivity series it is.The reactions of metals with acids gets FASTER and more violent as we GO from platinum, the least reactive, to potassium, the most reactive.Explanation:If HELPFUL mark me as brainliest |
|
| 40. |
Help please............. |
| Answer» 4AL + 3O2 GIVES 2Al2 O3Explanation:Al - aluminiumO - Oxygenwhile be burn ALUMINIUM in air we GET this balanced EQUATION | |
| 41. |
Acetic acid in benzene exhibits a molar mass of 80 g/mol. Its degree of dimerisation is |
|
Answer» Acetic acid undergoes dimerisation, when DISSOLVED in benzene. Molecular mass of acetic acid is found 120. The correct relation is α=2( dd−D )where d= Observed VAPOUR density D= Theoretical vapour density α= degree of ASSOCIATION n= NUMBER of molecules that undergo association.For association of molecule,α= d(1− n1 )d−D SUBSTITUTE n=2,α= d(1− 21 )d−D α= d( 21 )d−D α=2( dd−D )Hence, option (C) is the correct answer. |
|
| 42. |
Acetic acid is a weak acid and ammonia is weak base. Discuss the term weak |
|
Answer» tion:ACETIC ACID is dissociates into IONS but it does not ionize 100% therefore it is considered as WEAK acid. Ammonia dissociates into ions but it does not ionize 100% therefore it is considered as weak base. |
|
| 43. |
(4) Remains the same 47. Equal volumes of three acid solutions ofPH 3, 4 and 5 are mixed in a vessel. Whatwill be the H+ ion concentration in themixture ?(1) 3.7 X10-M(2) 1.1110-(3) 1.11 10-M(4) 3.7.10-M |
| Answer» DEXPLANATION:According to volumetric pricipleV1M1 + V2M2 + V3M3 = V4M4Since the VOLUMES are equal V1 = V2 = V3 = VM1 = 1×10−3 (since pH=3)M2 = 1×10−4 (since pH=4)M3 = 1×10−5 (since pH=5)(V + 1×10−3 ) + (V + 1×10−4 ) + (V + 1×10−5 ) = 3V + M43V + 10−3 (1+10−1 + 10−2) = 3V + M4M4 = 10−3 × (1 + 0.1+0.01) = 1.11 ×10−3 molar. | |
| 44. |
Draw the Lewis structure and find out the formal charge a)CO2b)CO3²-c)SO4²-d)H3O+e)NF3answer with the steps plz |
|
Answer» where I can DRAW bsbeq 6difkd7afelg8t |
|
| 45. |
A gas exert pressure on the wall of the container in which it is kept. Why? |
|
Answer» here's the answer please mark as brainliest and follow me Explanation:SEE the ATTACHMENT..In CONTINUATION...that is why a has EXERTS pressure...Hope it helps u |
|
| 47. |
What is the cause of the origin of a large number of organic compounds? ( if you give bad type of answer , you will be reported ,so answer honestly) |
|
Answer» Main reasons for a LARGE NUMBER of organic COMPOUNDS are: ... The property of carbon by which carbon-carbon link with each other to form a large number of organic compounds having DIFFERENT SHAPE and size is known as catenation property of carbon. |
|
| 48. |
Molecular orbital diagram of (OF ) and (OF+) |
| Answer» SEE the ATTACHMENT EXPLANATION: | |
| 49. |
Molecular orbital diagram of F2 negative?? please answer fast |
| Answer» Q | |
| 50. |
Pls give this answer......... |
| Answer» EXPLANATION: SODIUM PEROXIDE | |