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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. |
17no. Question of periodic table in science |
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Answer» PLZ MARK ME AS THE BRAINLIEST |
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| 2. |
What do we get when two or more elements are combined? |
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Answer» Answer: I think COMPOUND is formed please follow me and mark it as BRAIN list answer |
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| 3. |
The first, second and third ionisation energies of Alare 578, 1817 and 2745 kJ mol-7 respectively.Calculate the energy required to convert all the atomsof Al to Al+3 present in 270 mg of Al vapours(1) 5140 kJ(2) 51.40 kj(3) 2745 kJ(4) 514.0 kj |
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Answer» B) 51.4 KJ is the correct answer.... |
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| 4. |
What is resonance plz explain in detail |
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Answer» Answer: the SOUND produced in an OBJECT by sound of a SIMILAR frequency from another object |
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| 5. |
Hot water discharge can result in water pollution why |
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Answer» Answer: due kill of BACTERIA PRESENT in it Explanation: If we START heating water bacteria present in it didn't adapt and killed |
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| 6. |
(a) calculate the degree of dissociation and percent dissociation of acetic acid in its 0.1m solution: (given: ka=1.8×10power-5) (b) calculate ◇rg° for the reaction at 298k mg (s)+cu power2+(aq)-mg power2+(aq)+cu(s) (given:e° cell=2.71 v:if=96500cmol power-1) |
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Answer» क्सिलसकयसक्तजतजज़्यकज़हकक्सिकज़तकजगल्ज़लीज़तकस्क्यक्सिलसकयक्खज़हलजयलज़हकसहकसल्ज़ख़्सकगलीक्सकगज़कयजयकजयकजकयकयज़कयग्सकग्सकयसक्खसहक्सिसनगज़कगज़कगजगकसहलक्खज़ख़्सहकज़ख़्ज़कीज़कीज़जफ95989599 |
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| 7. |
Oxidation number of carbon in ch2o |
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Answer» In CH20 the oxidation no of OXYGEN is -2 hydrogen is +1 and the overall number is ZERO for the molecule therefore, -2×1 + 1×2 + X = 0 x = 0 Hence the oxidation number of carbon in CH2O will be zero. Hope this answer helps plz mark as brainliest. |
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| 8. |
What is carona virus and how to prepare a report on it ? |
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Answer» Corona virus Coronaviruses are a group of viruses that cause diseases in MAMMALS and birds. In humans, coronaviruses cause respiratory tract infections that are typically MILD, such as the common cold, though rarer forms such as SARS, MERS and COVID-19 can be LETHAL. Symptoms vary in other species: in CHICKENS, they cause an upper respiratory tract disease, while in cows and pigs they cause diarrhea. There are no VACCINES or antiviral drugs to prevent or treat human coronavirus infections. |
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| 9. |
An example of first order reaction 2HI-H2+I2 |
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Answer» what do you MEAN i don't UNDERSTAND |
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| 10. |
What is the meaning of "goes farthest to completion"? |
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Answer» Answer: In most chemical reactions the reactants COMBINE to form one or more products and the reaction GOES to completion, that means the reactants are al used up and you only have products. However, in some reactions, an EQUILIBRIUM OCCURS where there are both reactants and products present. Explanation: |
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| 11. |
Which one of the following is an element?A. rubyB. topazC. sapphireD. diamond |
Answer» <U>Hi✌️✌️I hope it will HELP u |
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| 12. |
Name three diseases causing microbes that in that can be present in bacteria,protozoa |
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Answer» Answer: |
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| 13. |
The number of atoms in 52 a.m.u. of He are(1) 13 atoms(2) 13 * 6.023 x 1023 atoms(3) 52 atoms(4) 52 x 6.023 x 1023 atoms |
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Answer» He has 4u. therefore 52÷4= 13 atoms.. |
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| 14. |
Explain the process of electric discharge during a thunderstorm |
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Answer» Answer: Hence, anelectrical DISCHARGE occurs WITHIN the clouds or between the clouds and the ground when SUFFICIENT negative and POSITIVE charge gathers inside the CLOUD and when the electricfield becomes sufficiently strong. This produces bolt. |
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| 15. |
What do you mean by ionisation? |
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Answer» Answer: Ionization or IONISATION, is the PROCESS by which an atom or a molecule ACQUIRES a negative or positive charge by GAINING or losing electrons, often in conjunction with other chemical changes. The resulting electrically charged atom or molecule is CALLED an ion. |
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| 16. |
Calculate Standard Gibbs Free Energy forthe given reaction : Zn + Cu2+ → Zn2+ + Cu.Given E⁰cell = 1.10V |
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Answer» Answer: Explanation: ∆G° = -N*F*E° CELL. (F=96500 Cmol^-1)
= -2*96500*1.10 = -2.213 KJ |
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| 17. |
Which metal is extracted from argentite one? |
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Answer» Explanation: |
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| 18. |
Al reacts with dil.HNO3 but not with con. HNO3. Why? |
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Answer» => HNO3 is strong OXIDISING agent. => O2 makes a oxygen layer on ALUMINIUM surface in air. => So, Al does not react with conc. HNO3 in air. => But in DILUTE medium HNO3 reacts with Al because O2 seperate from surface.. |
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| 19. |
What is the name of ch3cooh3 |
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Answer» CH3COOH is commonly known as ACETIC Acid, and it's IUPAC name is Ethanoic Acid please mark BRAINLIEST |
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| 20. |
6,7 dichloro 6,7 diene 2,3 oct di ol |
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Answer» PLEASE check the dear the has more MISTAKE better you TAKE a pic of QUESTION |
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| 21. |
Calculate Standard Gibbs Free Energy forthe given reaction : Zn + Cu2+ → Zn2+ + Cu.Given E cell = 1.10V.. |
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Answer» Explanation: LIST the standard electrode potentials in increasing order: × × × × × × × × × × × × × E ∘
( V ) × × × × × × × × × × ←−−−−−−−−−−−−−− Z n 2 + ( a q ) + 2 e ⇌ Z n ( s ) × × × × x − 0.76 C u 2 + ( a q ) + 2 e ⇌ C u ( s ) × × × × x + 0.34 × × × × × × × × × × × −−−−−−−−−−−−−−−→ The 1/2 cell with the most +ve E ∘ value will take in the electrons. So we can see that the copper 1/2 cell will be driven left to right and the zinc 1/2 cell right to left as indicated by the arrows. So the two 1/2 equations are: Z n ( a q ) → Z n 2 + ( a q ) + 2 e C u 2 + ( a q ) + 2 e → C u ( s ) Adding these gives the cell REACTION when it is working: Z n ( s ) + C u 2 + ( a q ) → Z n 2 + ( a q ) + C u ( s ) When the zinc atoms lose electrons the zinc ions go into solution and the 2 electrons flow away from this electrode into the external circuit. When they ARRIVE at the copper electrode, they are picked up by the copper(II) ions to become copper atoms. The two 1/2 cells are connected by a salt bridge or a membrane. The salt bridge consists of some filter paper soaked in a suitable electrolyte such as saturated POTASSIUM nitrate solution. The function of the salt bridge is to maintain electrical neutrality in each half cell. As zinc ions go into solution N O − 3 ions flood in to the half cell. As copper(II) ions leave the solution in the other 1/2 cell, K + ions flood in. To find the emf of the cell, subtract the least +ve E ∘ value from the most +ve: E ∘ c e l l = + 0.34 − ( − 0.76 ) = + 1.1 V |
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| 22. |
Structural formula for:2,2 – dimethyl butane2,3 – dimethyl butane3 – methyl pentane2 – methyl pentane |
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| 23. |
Define fluxWrite a note on leaching process |
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Answer» Answer: Fluxes for soft soldering are typically of organic nature, THOUGH inorganic fluxes, usually based on halogenides and/or ACIDS, are also used in non-electronics applications. Fluxes for brazing operate at significantly higher TEMPERATURES and are therefore mostly inorganic; the organic compounds tend to be of supplementary nature, e.g. to MAKE the flux sticky at low temperature so it can be easily applied. |
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| 24. |
Calculate the molarity of pure water density of Water 1 gm mol par litre |
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Answer» Mass of water = 18gm MOLARITY = no.of moles / mass of SOLVENT = 1/18 Explanation: |
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| 25. |
Pcl5 =pcl3+cl2 when .03 mole of pcl5 was brought to equilibrium at 500k the equilibrium volume was 2.05l the value of kp |
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Answer» Explanation: PCL5 =pcl3+cl2 when .03 MOLE of pcl5 was BROUGHT to EQUILIBRIUM at 500k the equilibrium volume was 2.05l the value of KP |
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| 26. |
C6H7COOH find structure |
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Answer» we are not SURE but if there are DOUBLE BONDS then this is the ANSWER |
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| 27. |
Why the eye of a tornado is calm |
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Answer» Answer: The eye is so calm because the now strong surface WINDS that converge towards the center never REACH it. The CORIOLIS force deflects the wind slightly away from the center, causing the wind to rotate AROUND the center of the hurricane (the eye wall), leaving the exact center (the eye) calm. |
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| 28. |
How are primery secondary and tertiary nitroalkanes distinguished using hno2 |
Answer» Primary SECONDARY and tertiary nitroalkanes distinguished using NITROUS acid.Explanation: Nitrous acid
To learn more; Reaction of nitrous acid primary, secondary and tertiary amines What is ACTION of HNO2 on primary and secondary nitroalkanes |
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| 29. |
Postulates and limitations of Bohr model of atom |
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Answer» Answer: Limitations of Bohr's Model of an Atom Bohr's model of an atom failed to explain the Zeeman EFFECT (effect of magnetic FIELD on the spectra of atoms). It also failed to explain the Stark effect (effect of electric field on the spectra of atoms). ... It COULD not explain the spectra obtained from LARGER atoms. |
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| 30. |
Who is pieera de fermat |
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Answer» Answer: PIERRE DE Fermat was a French LAWYER at the Parlement of Toulouse, France, and a MATHEMATICIAN who is given credit for early developments that led to infinitesimal calculus, INCLUDING his technique of adequality. please follow me and mark me brainliest |
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| 31. |
4. A+B gives C + D initially if the concentration of A and B are both equal but at equilibrium, concentrationof D will be twice of that of A, then what will be the equilibrium constant of the reaction? a) 4/9b) 9/4c)1/9d)4 |
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Answer» D)4 EXPLANATION: REFER TO THE PHOTO FOR MORE INFORMATION HOPE IT HELPED |
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| 32. |
Honey and sugar solution do not conduct electricity why |
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Answer» Because they are INSULATOR |
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| 33. |
Artificial ripening fruits ? explain |
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Answer» Answer: please MARK me as the BRAINLIEST and FOLLOW me |
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| 34. |
Sulfur dioxide reacts with chlorine at 227 C: so2(g) +Cl2(g)--S02Cl2(g) 2-1 K for this reaction is 5.1 x 10 atm. Initially, 1.00 g each of SO2 and Cl2 are placed in a 1.00 L reaction vessel. After 15 minutes, the concentration of SO2Cl2 is 45.5 μg/mL. You will determine if the system has reached equilibrium. First, what is Kc (in L/mol)? (A ug is 10 g.) |
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Answer» Explanation: Sulfur DIOXIDE reacts with CHLORINE at 227 C: so2(G) +Cl2(g)--S02Cl2(g) 2-1 K for this reaction is 5.1 X 10 atm. Initially, 1.00 g each of SO2 and Cl2 are placed in a 1.00 L reaction vessel. After 15 minutes, the concentration of SO2Cl2 is 45.5 μg/mL. You will determine if the SYSTEM has reached equilibrium. |
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| 35. |
Toluene is more easily nitrated than benzene . Explain |
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Answer» Answer: Pls mark this as brainliest. Toluene is methyl-benzene and according to the question we are comparing it with benzene ( in context of nitration obviously) Now of the many substituents that could be added to the benzene ring, the methyl group which is added to the benzene ring CONFERS it special properties making it different from benzene . What are these special properties? The methyl group is an electron donating group. The extra electron density delivered into the ring by the substituent is not equally divided over the entire ring, but is concentrated on atoms 2, 4 and 6 (the ortho and para positions). So how does that help? Basically,the methyl of the toluene stabilizes the cationic intermediate formed during the substitution by donating electrons into the ring system, by either INDUCTIVE effect or resonance effects making the reaction more favorable. The above SAID positions (ortho and para) are the most reactive towards an electron-poor electrophile, thus promoting electrophillic substitution reaction. The methyl group hence makes it AROUND 25 times more reactive than benzene hence making its nitration more easier than that of benzene. |
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| 36. |
Write the reaction of hydrolysis of calcium cyanamide |
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Answer»
mark me as BRAINLIEST |
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| 37. |
What are soaps..how are soap prepared? |
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Answer» Answer: MARK as brainliest and follow me Explanation:Soaps are usually OBTAINED by the hydrolysis of oils and fats with sodium or potassium hydroxide. Transparent soaps are prepared by DISSOLVING ORDINARY soaps in alcohol and then removing the insoluble part by filtration. The solid transparent mass is obtained on evaporating off alcohol. |
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| 38. |
Round the following upto 3 significant figures10.4107 34.216 |
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Answer» Answer:10.4 34.2 Explanation: |
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| 39. |
Flourine is a stronger reducing agent than chlorine why? |
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Answer» Answer: Fluorine is more electronegative than chlorine, therefore, it can attract a shared PAIR of ELECTRON more easily and STRONGLY than chlorine. Thus, it can easily ACCEPT the pair of electrons and undergoes REDUCTION. Thus it is a strong oxidizing agent than chlorine. HOPE IT HELPS ✌✌✌ |
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| 40. |
What is light? How is it useful? |
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Answer» LIGHT -- A ENERGY THAT ALLOW US TO SEE OBJECTS CONSEQUENCES- 1. IT HELPS TO SEE OBJECTS |
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| 41. |
When we heat mixture of sulfur and iron fillings the finstructions observation would be. |
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Answer» Hi... Here's your answer.. When iron filings and sulphur powder are mixed and heated they undergo a chemical REACTION and form ferrous sulphide (FeS). It is a NEW SUBSTANCE which has PROPERTIES entirely DIFFERENT from Fe and S. Therefore, heating of mixture of iron and sulphur powder is a chemical change. Mark me as the brainliest if helped you.. Thanks!
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| 42. |
Who discovered islands and isotopes |
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Answer» Fredrik Soddy was the first to TELL about isotopes. Explanation: I hope my answer is satisfiable If my answer is up to your mark then mark it as the BRAINIEST answer. Follow me for more Don't forget to LIKE |
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| 43. |
temperature and determine the state of substance whether it will be a solid liquid or gas |
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Answer» Two factors DETERMINE whether a SUBSTANCE is a solid, a liquid, or a gas: The kinetic energies of the particles (atoms, molecules, or ions) that make up a substance. Kinetic energy tends to keep the particles moving APART. The attractive intermolecular forces between particles that tend to draw the particles together |
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| 44. |
19. आप कैसे प्रदर्शित करेंगे कि कॉपर सिल्वर से अधिकक्रियाशील होता है? |
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Answer» किसी वर्ग या आवर्त में परमाणु त्रिज्या किस प्रकार परिवर्तित होती है? इस परिवर्तन की व्याख्या आप किस प्रकार करेंगे?ठजठथगततगमगमराजाएछ. 44543 |
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| 45. |
Industrial preparation of hydrogen from methane |
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Answer» Explanation: |
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| 46. |
Example of electrolytic reduction |
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Answer» Answer: 1)SODIUM metal is obtained by electrolysis of MOLTEN sodium chloride. 2) ELECTROLYTIC REDUCTION of alumina. |
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| 47. |
(आ) दिलेल्या विषयावर जाहिरात लेखन(आईस्क्रीम पार्लर• वरील विषयावर आकर्षक जाहिरात तयार करा.(इ) शब्दांवरून जाहिरात लेखन : |
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Answer» READ the ATTACHMENT and MARK BRAINLEAST |
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| 48. |
What do you mean by Biochemical Oxygen Demand(BOD)? |
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Answer» Answer: Biochemical oxygen demand (BOD, also called BIOLOGICAL oxygen demand) is the amount of dissolved oxygen needed (i.e. DEMANDED) by aerobic biological organisms to break down organic material present in a given WATER SAMPLE at CERTAIN temperature over a specific time period |
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| 49. |
A colloid is a heterogeneous mixture and its component can be separated by the technique known as |
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Answer» centrifugation is the PROCESS used to seperate COLLOIDS COMPONENTS |
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| 50. |
Why molar conductivity of acetic acid cannotbe obtained by plotting lambda M versusunder root c at infinite dilution ? Limitingmolar conductivity of NaCl, HCl andCH,COONa are are 126.4, 425.9 and 91.05 cm?mol- respectively. Calculate limiting molarconductivity for HAC.[4 marks) |
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Answer» The limiting molar conductivity for acetic ACID (HAc) is 390.55 Scm²mol⁻¹ - at infinite dilution , electrolyte dissociates completely but at such LOW concentration the conductivity of the solution is so low that it cannot be measures accurately. Hence, the molar conductivity of acetic acid cannot be obtained by plotting LAMBDA M versus - Using Kohlrausch's law, we have λ°(NaCl) = λ°(Na⁺) + λ°(Cl⁻) ----1 λ°(HCl) = λ°(H⁺) + λ°(Cl⁻) ----2 λ°(AcNa) = λ°(Na⁺) + λ°(Ac⁻) ----3 λ°(HAc) = λ°(H⁺) + λ°(Ac⁻) ----4 - on adding 2 and 3 equation and subtracting 1 from it, we get equation 4 - so we have λ°(HAc) = λ°(HCl) + λ°(AcNa) - λ°(NaCl) λ°(HAc) = 425.9 + 91.05 - 126.4 λ°(HAc) = 390.55 Scm²mol⁻¹ |
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