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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.
| 2. |
An example of redox reaction which is also an example of composition reaction. |
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Answer» hydrogen+oxygen= waterH2+O2=H2O |
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| 3. |
What is the mass of NaOH present in 1kg solution which has molality 1. |
| Answer» MASS of NA= 23mass of O = 16mass of H = 1Mass of NAOH = 23+16+1 = 40☑️ | |
| 4. |
Differciant between molecular mass and formula mass,which of the following have molecular formula? H2O,NaCl,KL, H2SO4 |
| Answer» TION:BB vvvvvvvvvxaaadffvvbbbbbbbbbbbbbbvvvvvvb | |
| 5. |
Compare and contrast the electrical conductivity of HCl and CH3COOH |
| Answer» CONDUCTIVITY of CH3COOH is low. HCL is a strong acid and it COMPLETELY dissociates into H3O+ and Cl– ions. This means the conductivity will be high, as there will be a LARGE concentration of ions in solution. | |
| 7. |
describe the concept of homologous series as a family of similar compounds with similar properties due to the presence of the same functional group |
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Answer» This is a series or family of organic compounds that have similar features and CHEMICAL properties due to them having the same functional GROUP. All members of a homologous series have: ... They have gradation in their physical properties. The DIFFERENCE in the molecular formula between one MEMBER and the next is CH2.Explanation:MARK ME AS BRAINLIEST |
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| 8. |
Ch3_ CH=CH– сhо iupac name |
| Answer» TION:but-2-en-1-al............. | |
| 9. |
Identify the reaction order from each of the following rate constants: (i) k = 2.3 × 10-5 L mol-1 s-1 (ii) k = 3 × 10-4 s-1 |
| Answer» | |
| 10. |
For the reaction Cl2(g)+2NO(g) → 2NOCl(g), the rate law is expressed as rate = k[Cl2][NO]2 What is the overall order of this reaction? |
| Answer» MUJHE lagta ha i iska answer HAI Explanation:P and CL | |
| 11. |
What is the difference between law of mass action and rate law? |
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Answer» The MAIN difference between rate law and law of MASS action is that, rate law is given CONSIDERING only the reactants of a reaction whereas law of mass action is given considering both reactants and PRODUCTS of a reaction. The rate law and the law of mass action explains the chemical KINETICS of reactions. |
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| 12. |
State a condition in which bimolecular reaction is kinetically first order reaction. |
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Answer» A bimolecular reaction can be kinetically FIRST order in behaviour provided ONE of the reactants is TAKEN in such a LARGE excess that its concentration may hardly change. Such a reactant will not contribute to the order. Thus, a bimolecular reaction will be of first order. |
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| 13. |
T99% = 2t90%, in first order reaction. [True/False] |
| Answer» TRUEEXPLANATION: | |
| 14. |
What will be the units of rate of a reaction in gaseous reactions? |
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Answer» f RATE of REACTION are concentration . So, if concentration is in MOL and time is in SECOND, then unit for rate of reaction will be mol . But, in gaseous reactions, when concentration of gases is expressed in terms of their PARTIAL pressure, the units of rate will be . |
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| 15. |
If t of first order and zero order are same. Then the ratio of the initial rates of first order reaction to the zero order reaction is ______________ . |
| Answer» HALF lives of first order and a ZERO order reaction are same . Then the RATIO of the initial rates of the first order reaction to that of the zero order reaction is. So , 12k=0.693k′ or k′k=2×0.693.KEEP SMILING.... ... | |
| 16. |
SN2 (substitution nucleophilic reaction) in Primary halide is bimolecular and order is 2. [True/False] |
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Answer» ctions are bimolecular. And SINCE the reaction depends on the CONCENTRATION of both the reactants they are SECOND order reactions.So imo, the ANSWER should be True |
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| 17. |
Calculate the overall order of a reaction which has the rate expression (a) Rate = k [A]1/2 [B]3/2 (b) Rate = k [A]3/2 [B]-1 [Delhi 2011(C); AI 2011(C)] |
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Answer» (a) RATE= K[A]21[B]23∴ order of reaction = 21+23=24=2.(b) Rate= K[A]23[A]−1∴ order of reaction = 23−1=21 |
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| 18. |
For a reaction, , A → B, the rate of reaction can be denoted by |
| Answer» ISKA answr HAI EXPLANATION:secon d one SRY han | |
| 19. |
T1/2 is inversely proportional to initial concentration in zero order reaction. [True/False] |
| Answer» PLANATION:no the above statrment is FALSE t1/2is DIRECTLY PROPORTIONAL to CONC. | |
| 20. |
SN1 (substitution nucleophilic reaction) in Tertiary halide is bimolecular but order is 1. [True/False] |
| Answer» ANSWER is FALSE HOPE this will HELP you | |
| 21. |
Which one of the following substances is not a mixture? (a) Air (b) Petrol (c) Water (d) Crude oil |
| Answer» | |
| 22. |
Find the number of proton and neutrons in the nucleus of an atom of an elementX which is represented as 207X82 |
| Answer» ATOMIC no. is 82atomic MASS is 207the no.of PROTON =82=no.of electronthe no. of nwutron is 207-82=125 neutronhope so HELPFUL. | |
| 23. |
Solvent X boils at 78.5oC and at 82.3 oC when non volatile solute y is added to it what istb |
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Answer» Tb=Tb-T b_0 ........... |
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| 24. |
Help please if u can |
| Answer» HIGHEST PH value is that,EXPLANATION:acid,: H2 SO4 is highest acid and it's pH value will be HIGH. | |
| 25. |
4PCL3 which is solution is this |
| Answer» PHOSPHORUS TRICHLORIDE is ALSO WRITTEN as PCL3 | |
| 26. |
When CaoCl2 is treated with excess of dilute acids, then its bleaching action is due to. |
| Answer» EXPLANATION:Bleaching powder, when reacts with water, forms nascent oxygen. This is responsible for bleaching action. 2CaOCl2+2H2O⇌CaCl2+Ca(OH)2+2HClOHClO⇌HCl+[O]COLOURED material +[O]→ colourless materialHence, OPTION B is correct.Hope this will be helpful to you and please MARK my answer as the brainleast answer.plz plz | |
| 27. |
Describe the general features characteristics of homologous series |
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Answer» Features include a GENERAL formula and NEIGHBOURING MEMBERS differing by CH2, with similar chemical properties and with a GRADATION in physical properties. Homologous series are 'families' of organic compounds. They share COMMON characteristics: They all contain the same functional group Mark as brainlist answer |
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| 28. |
What is the diffrence between molality and molarity ?? |
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Answer» Morality is an enhanced form of one's character by which an INDUVIDUAL ALWAYS remaineded of others status and respect induvidually and SOCIALLY so that he will not offend others by thoughts, word or deed. Whereas liberty has got two aspects MATERIAL and spiritual. |
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| 29. |
Compound which is used in rendering wool unshrinkable |
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Answer» hypochloriteA process of rendering WOOL unshrinkable comprising removing substantially all moisture from the wool, treating it with a mixture of a tertiary hypochlorite from the group CONSISTING of tertiary butyl hypochlorite and tertiary amyl hypochlorite and a primary or secondary ALCOHOL containing one to five carbon atoms.HOPE THIS HELPS YOU ✌️ |
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| 30. |
A shiny brown coloured element ‘X’ on heating in air becomes black in colour. Name the element ‘X’ and the black coloured compound formed. |
| Answer» | |
| 31. |
8 In a reaction A + B2→AB2 Identify the limiting reagent, if any, in the following reaction mixtures. i. 300 atoms of A + 200 molecules of B ii. 2 mol A + 3 mol B iii. 100 atoms of A + 100 molecules of B iv. 5 mol A + 2.5 mol B v. 2.5 mol A + 5 mol B 9 Calculate the atomic mass (average) of chlorine using the following data: Isotope % Natural Abundance Molar Mass 35CI 75.77 34.689 37CI 24.23 36.9659 10 In three moles of ethane (C2H6), calculate the following: i. Number of moles of carbon atoms. ii. Number of moles of hydrogen atoms. iii. Number of molecules of ethane. 11 Calculate the amount of water (g) produced by the combustion of 16 g of methane 12 How many moles of methane are required to produce 22 g CO2(g) after combustion? 13 What is the concentration of sugar (C12H22O11) in mol L–1 if its 20 g are dissolved in enough water to make a final volume up to 2L? 14 If the density of methanol is 0.793 kg L–1, what is its volume needed for making 2.5 L of its 0.25 M solution? 15 Calculate the number of atoms in each of the following (i) 1) 52 moles of Ar; ii.) 52 u of He; iii.) 52 g of He; 16. What is the molarity of a solution containing 5.035 grams of FeCl3 in enough water to make 500 mL of solution? 17 What is the molarity of a solution containing 72.06 grams of BaCl2 in enough water to make 800 mL of solution? 18 What is the volume of a 0.1 M HCl solution containing 1.46 grams of HCl? 19 MCQ: Unit of Molarity 1.mole/liter 2. Mole/m^3 3.mole/cm^ 4.mole/dm^3 |
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Answer» the ANS is EXPLANATION:the first one MEANS ans is 1. |
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| 32. |
What volume of air (containing 20% O, by volume) will be required to burn completely 10 cm3 each of methaneand acetylene.CH4 + 202 → CO2 + 2H202C2H2 +502 + 4CO2 + 2H2O |
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Answer» tion:I take gas O2. but in question you MENTIONED O. IF this is so then multiply FINAL volume by 2 you will get volume of O. i.e nascent oxygen. REPLY if you are not satisfied. |
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| 33. |
Example for double displacement |
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Answer» Example of DISPLACEMENT REACTION-Ba(OH)2+Na2SO4 gives BaSO4+NaClIn this reaction, there is exchange of ions between the reactants to form the products. BARIUM sulphate is the WHITE precipitate formed. Hope it will help you.. MARK the brainliest |
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| 34. |
Claculate the osmotic pressure of decimolar solution of surcrose at 300k |
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Answer» , R=0.0821 , T= 300K decimolar=1/10=0.1Explanation:op=MRT op=0.1×0.0821×300 =2.463 |
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| 35. |
Baking soda on thermal decomposition produces: |
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Answer» Baking soda on THERMAL decomposition produces sodium carbonate, CARBON dioxide and WATER. HOPE it will HELP you.. Mark the brainliest |
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| 36. |
At high pressure the following reaction is zero order. Which of the following options are correct for this reaction? [NCERT Exemplar] (a) Rate of reaction = Rate constant (b) Rate of the reaction depends on concentration of ammonia. (c) Rate of decomposition of ammonia will remain constant until ammonia disappears completely. (d) Further increase in pressure will change the rate of reaction." |
| Answer» ASE MARK me as BRAINLIEST THEN I FOLLOW YOU BACK and you get point please please please please please | |
| 37. |
Note: In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices. (Q.22 and Q.23) (a) Both assertion and reason are correct and the reason is correct explanation of assertion. (b) Both assertion and reason are correct but reason does not explain assertion. (c) Assertion is correct but reason is incorrect. (d) Both assertion and reason are incorrect. (e) Assertion is incorrect but reason is correct Assertion: Order of the reaction can be zero or fractional. Reason: We cannot determine order from balanced chemical equation. [NCERT Exemplar] |
| Answer» TION:THODA SHORT me LIKHA KR | |
| 38. |
An endothermic reaction with high activation energy for the forward reaction is given by the diagram. " |
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Answer» I Explanation:ftdyd CD DOWNLOAD free tdfffguu FURNISH regimen REGROUP |
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| 39. |
According to Maxwell Boltzmann distributon of energy, _________ . [NCERT Exemplar] (a) the fraction of molecules with most probable kinetic energy decreases at higher temperatures. (b) the fraction of molecules with most probable kinetic energy increases at higher temperatures. (c) most probable kinetic energy increases at higher temperatures. (d) most probable kinetic energy decreases at higher temperatures. |
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Answer» The FRACTION of molecules with most PROBABLE KINETIC ENERGY increases at higher temprature |
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| 40. |
Note: In the following questions two or more options may be correct. Rate law cannot be determined from balanced chemical equation if __________ . [NCERT Exemplar] (a) reverse reaction is involved. (b) it is an elementary reaction. (c) it is a sequence of elementary reactions. (d) any of the reactants is in excess. |
| Answer» OPTION (a) is correctpls MARK me as BRAINLIST | |
| 41. |
Which among the following is a false statement? (a) Rate of zero order reaction is independent of initial concentration of reactant. (b) Half life of a third order reaction is inversely proportional to square of initial concentration of the reactant. (c) Molecularity of a reaction may be zero or fraction. (d) For a first order reaction, |
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Answer» a) RATE of zero order REACTION is independent of INITIAL concentration of a reactantExplanation:t1/2 is directly PROPORTIONAL to [A] |
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| 42. |
If activation energy for forward reaction (Ea)b = 150 kJ and (Ea)b is 260 kJ, ∆H of reaction |
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Answer» -110Explanation:E(F) =activation energy of forward REACTION ;E(b) activation of BACKWARD reaction. ∆H=E(f)-E(b) =150-260 ∆H = -110 |
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| 43. |
Assertion: Order and molecularity are same. Reason: Order is determined experimentally and molecularity is the sum of the stoichiometric coefficient of rate determining elementary step. [NCERT Exemplar] |
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Answer» DExplanation:SINCE assertion STATEMENT is totally incorret there there is no need for GOING to reasonOrder and MOLECULARITY is totally DIFFRENT |
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| 44. |
Match the statements given in Column l and Column II. [NCERT Exemplar] |
| Answer» THANK you for them | |
| 45. |
Calculate the molality of 9.8% (w/w) solution of sulphuric acid. Given the density of solution is 1.02g/ml |
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Answer» means 9.8gr in 100gr of solution the MASS of solvent is 100-9.8=90.2 gr molality=mass of SOLUTE/molar mass of solute*1000/mass of solvent=9.8/98*1000/90.2=1.108molality (m)HOPE so helpful. |
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| 46. |
Match the graph given in Column I with the order of reaction given in Column II. More than one item in Column I may link to the same item of Column II. [NCERT Exemplar] |
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Answer» CHEMISTRYMatch the graphs GIVEN in column I with the order given in column II and mark the appropriate choice.Column II(i) Third order(ii) First order(iii) Zero order(iv) Second order934412ShareStudy laterANSWERFormula that relate concentration and time is:-Kt= n−11 [ Ao n−1 1 − At n−1 1 ],t∝ Ao1 n−1 For zero order reaction, this equation will be At=Ao−Kt Y=+C−mx so the first is zero order reaction graph,[slope is NEGATIVE]For first order reaction, this equation will be log[At]=log[Ao]−KtY=+c−mx so the second is first order reaction graph,[slope is negative]For C and D there is direct relation between time and concentrationt∝ Ao1 n−1 for C power of {A} is −1 that MEANS 1−n=−1 So order(n)=1+1=2for D power of {A} is −2that means 1−n=−2 So order(n)=2+1=3.So the correct option is [B]. |
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| 47. |
When strong beam of light passed through a colloids the light will be |
| Answer» DALL effect is the scattering of light as a light beam passes through a COLLOID. The individual suspension particles scatter and reflect light, making the beam visible. The Tyndall effect was first DESCRIBED by 19th-century PHYSICIST John Tyndall.pls mark as brainliest mate | |
| 48. |
Which of the following statements are applicable to a balanced chemical equation of an elementary reaction? [NCERT Exemplar] (a) Order is same as molecularity. (b) Order is less than the molecularity. (c) Order is greater than the molecularity. (d) Molecularity can never be zero. |
| Answer» AEXPLANATION:SINCE for an elementry REACTION ORDER and molecularity is same EXPERIMENTALLY | |
| 49. |
Which of the following statements about the catalyst is true? (a) A catalyst accelerates the rate of reaction by bringing down the activation energy. (b) A catalyst does not participate in reaction mechanism. (c) A catalyst makes the reaction feasible by making ∆G more negative. (d) A catalyst makes equilibrium constant more favourable for forward reaction. |
| Answer» | |