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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. |
When a small amount of FeCl3 is added to a freshly precipitated Fe(OH)3, b reddish brown colloidal solution is obtained. This pheno¬menon is known as (a) dialysis (b) peptization (c) protection (d) dissolution |
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Answer» TIONPLEASE MARK IT BRAINLIEST |
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| 2. |
On the basis of data given below predict which of the following gases shows least adsorption on a definite amount of charcoal? [NCERT Exemplar] (a) CO2 (b) SO2 (c) CH4 (d) H2 |
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Answer» Here,☑️☑️☑️ SO2 ADSORBS ONA definite AMOUNT of charcoal☑️☑️☑️ |
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| 3. |
Cottrell precipitator is used to (a) precipitate mud from muddy water. (b) precipitate carbon particles from smoke. (c) purify the ordinary drinking water. (d) precipitate salts in qualitative analysis. |
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Answer» The Cottrell precipitator is USED to☑️☑️☑️ PRECIPITATE SALTS in QUALITATIVE ANALYSIS ☑️☑️☑️ |
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| 4. |
Which of the following is an example of heterogenous catalyst? |
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Answer» its VEY complecatrdExplanation:ksngkw lalbsi |
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| 5. |
In Freundlich adsorption isotherm x/m = Kp1/n, the value of ‘n’ at low pressure is (a) more than one. (b) less than one. (c) equal to one. (d) from zero to one. |
| Answer» LESS than ONE MEANS OPTION b is the CORRECT answer | |
| 6. |
Physical adsorption of a gaseous species may change to chemical adsorption with ___________ . [NCERT Exemplar] (a) decrease in temperature (b) increase in temperature (c) increase in surface area of adsorbent (d) decrease in surface area of adsorbent |
| Answer» OPTION (a)Physical adsorption of a GASEOUS species MAY CHANGE to chemical adsorption with DECREASE in temperature. | |
| 7. |
In a first order reaction 30%of the reaction of decomposes in 45 min. Cal half life of reaction |
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| 8. |
A pure substance consists of a ______ type of particles. |
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Answer» e!Here is your ANWER:A pure substance contains on type of particlesHope I was able to HELP you!Stay home and stay SAFE! |
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| 9. |
Define empirical formula and molecular formula. Write the relationship between empirical formula and molecular formula. |
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Answer» mula which indicates the actual RATIO of the atoms in a molecule/compound is molecular FORMULA.The formula which indicates the simple ratio of the atoms in a molecule/compound is emperical formula.For EXAMPLE:Glucose=C6H1206,this is the molecular formula but if the numbers 6,12 and 6 are DIVIDED by a common MULTIPLE which is 6 to make the compound appear in its smallest form,it becomes CH2O.This is the emperical formula of the compound. |
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| 10. |
Which of the following statement is not true regarding the characteristic of matter?(a) Particles of a matter are randomly moving in all directions.(b) Kinetic energy of the particles increases with a rise in temperature(c) Kinetic energy of the particles of all maters remains the same at a particular temperature.(d) Particles of matter diffuse into each other on their own. |
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| 11. |
In ------ block elements the last electron is filled up in the antepenultimate shell. .d.f.s.p |
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Answer» lock elements the last electrons is filled up in the ANTEPENULTIMATE shell....1. D2. f3. S4. p ✓ |
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| 12. |
Q> WHICH OF THE FOLLOWING COMPLEXES HAS LARGER CRYSTAL FIELD SPILTINGOF D-ORBITALS IN EACH PAIR?7+20 [CO(Hebo] or [CO (H2O)6] |
| Answer» TION:CORRECT ANSWER is in the PHOTOGRAPH | |
| 13. |
What is the carrer/job in msc Polymer science and engineering |
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Answer» hy ur answer is EXPLANATION:Opportunities after Polymer Science could be in companies dealing with the manufaturing of materials involving POLYMERS. Companies like Asian Paints, Apollo Tyres,Anchor Industries,Supreme Industries,Havell's India Ltd,MRF and MANY more OTHERS RECRUIT individuals with Polymer Science educationhope it helps umark me as brainlist |
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| 14. |
What is isomerisation and what is the isomer of C2H5OH? |
| Answer» ISOMER of ETHANOL is the ANSWER | |
| 15. |
5.32 gm of table salt and 3.936gm of sugar were mixed with 28.2 gm and 38.2 gm of water .what is properly reported mass of the solution |
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Answer» ivity 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 solutionplease mark me as BRAINLIEST then I will be very happy and follow you back |
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| 16. |
Gold sol can be prepared by (a) Hydrolysis of AUCl3 (b) Oxidation of Gold by aqua-regia (c) Peptization (d) Reduction of AUCl3 with HCHO solution. |
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Answer» :DGold SOLUTION can be PREPARED by (d) REDUCTION of AUCL3 with HCHO solution |
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| 17. |
Which is favourable for physical adsorption? (a) High T and high P (b) High T and low P (c) Low T and high P (d) T and P do not affect |
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Answer» tion: The PHYSICAL adsorption is an exothmeric PROCESS. it is favoured at low temperature with the increase in temperature the extent of ABSORPTION decrease |
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| 18. |
3g of activated charcoal was added to 50 ml of acetic acid solution (0.06 M) in a flask. After an hour it was filtered and the strength of filtrate was found to be 0.042 M. The amount of acetic acid adsorbed per gram of charcoal is (a) 42 mg (b) 54 mg (c) 18 mg (d) 36 mg |
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| 19. |
The protective power of lyophilic colloidal sol is expressed in terms of (a) coagulation value (b) gold number (c) CMC (Critical Micelle Concentration) (d) oxidation numbers |
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Answer» oeoswpl EXPLANATION:its ANSWER is d |
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| 20. |
The stability of lyophobic sols is due to (a) adsorption of covalent molecules on the colloid (b) the size of the particles (c) the charge on particles (d) Tyndall effect. |
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| 21. |
The best coagulant for the precipitation of Fe(OH)3 sol is (a) Na2HPO3 (b) NaNO3 (c) Na3PO4 (d) Na2SO4 |
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| 22. |
According to Freundlich adsorption isotherm, which of the following is correct? (a) x/m∝p^1 (b)x/m∝p^1/n (c) x/m∝p^0 (d) All are correct under different pressures |
| Answer» ISKA SARA OPTION SAHI haiExplanation:ANS is d | |
| 23. |
The term ‘sorption’ stands for ___________ . [NCERT Exemplar] (a) absorption (b) adsorption (c) both absorption and adsorption (d) desorption |
| Answer» OPTION cAbsorption + ADSORPTION = SORPTION | |
| 24. |
Identify the positively charged colloid. (a) Haemoglobin (b) As2S3 (c) Clay (d) Gold sol |
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| 25. |
During the adsorption of gas on the surface of solid, which of the following is true? (a) ∆G < 0, ∆H > 0, ∆S < 0 (b) ∆G > 0, ∆H < 0, ∆S < 0 (c) ∆G < 0, ∆H < 0, ∆S < 0 (d) ∆G < 0, ∆H < 0, ∆S > 0 |
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| 26. |
The coagulation values in millimoles per litre of the electrolyte for the coagulation of As2S3 sol are given I. NaCl (52) II. BaCl2 (0.69) III. MgSO4 (0.22) The correct order of coagulating power is (a) I > II > III (b) II > I > III (c) III > II > I (d) III > I > II |
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| 27. |
What are azetropes and give examples name their afferent types with examples and relation to non ideal solutions |
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Answer» trope (/əˈziːəˌtroʊp/)[1] or a constant BOILING point mixture is a mixture of TWO or more liquids whose proportions cannot be altered or changed by SIMPLE distillation.[2] This happens because when an azeotrope is boiled, the vapour has the same proportions of constituents as the unboiled mixture. Because their composition is unchanged by distillation, azeotropes are also called (especially in older texts) constant boiling point mixtures.Some azeotropic mixtures of pairs of compounds are known,[3] and many azeotropes of THREE or more compounds are also known.[4] In such a case it is not possible to separate the components by fractional distillation. There are two types of azeotropes: minimum boiling azeotrope and maximum boiling azeotrope. A solution that shows greater positive deviation from Raoult's LAW forms a minimum boiling azeotrope at a specific composition. For example, an ethanol-water mixture (obtained by fermentation of sugars) on fractional distillation yields a solution containing approximately 95% by volume of ethanol. Once this composition has been achieved, the liquid and vapour have the same composition, and no further separation occurs. A solution that shows large negative deviation from Raoult's law forms a maximum boiling azeotrope at a specific composition. Nitric acid and water is an example of this class of azeotrope. This azeotrope has an approximate composition of 68% nitric acid and 32% water by mass, with a boiling point of 393.5 K (120.4 °C). |
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| 28. |
Convert Benzoic Acid to Benzyl Cyanide |
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| 29. |
The mass obtained on burning a magnesium ribbon is more than the mass of original ribbon before the change?what is the type of change |
| Answer» NOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO! | |
| 30. |
What r the types of plastic? |
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Answer» To SUMMARIZE, there are 7 types of plastic exist in our current modern days:1 – Polyethylene Terephthalate (PET or PETE or Polyester) ...2 – High-Density Polyethylene (HDPE) ...3 – POLYVINYL Chloride (PVC) ...4 – Low-Density Polyethylene (LDPE) ...5 – POLYPROPYLENE (PP) ...6 – Polystyrene (PS) ...7 – Other. |
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| 31. |
Difference between negative and positive deviations in a solutions |
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Answer» A positive deviation means that there is a higher than expected vapour PRESSURE above the SOLUTION . A negative deviation conversely, means that we find a lower than expected vapour pressure for the solution.... solutions that OBEY raoult's law are called ideal solutions because they behave exactly as we WOULD PREDICT |
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| 32. |
Describe the process of coal formation...pls write in short |
| Answer» COAL is FORMED by the PROCESS of CARBONISATION......FOLLOW me ♥ | |
| 35. |
If V is amount of adsorbate and ‘/n’ is amount of adsorbent, which of the following is related to adsorption process? |
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Answer» question is actually not RELATED to ADSORPTION PROCESSSO option is d. |
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| 36. |
The correct ascending order of adsorption of the following gases on the same mass of charcoal at same temperature and pressure is (a) CH4 < H2 < SO2 (b) H2 < CH4 < SO2 (c) SO2 < CH4 < H2 (d) H2 < SO2 < CH4 |
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| 37. |
Colloidion is 4% solution of which one of the following in alcohol-ether mixture. (a) Nitroglycerin (b) Cellulose acetate (c) Glycol dinitrate (d) Nitrocellulose |
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| 38. |
Express the relation between the half-life period of a reactant and its initial concentration for a reaction of nth order. |
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| 39. |
Define threshold energy of a reaction. |
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Answer» Threshold energy is the minimum KINETIC energy the molecules must have to bring about effective COLLISIONS between two reactant molecules considered as hard spheres, resulting in a chemical reaction.Explanation:THEREFORE, Threshold energy= Average of the initial kinetic energy possessed by the reactants + Activation energy (Ea) |
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| 40. |
For a hypothetical reaction A+ 2B → C, it is found that the rate = k [A] [B]. What is the most likely rate determining step? |
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Answer» The rate equation for the REACTION 2A + B → C is found to be: rate = k[A][B]. The CORRECT STATEMENT in relation is/are: A . The VALUE of k is independent of the initial concentration of A and B. |
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| 41. |
What is the shape of graph between log k vs 1/T What is the relationship between its slope and activation energy (Ea). |
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Answer» jdsbpsbsojn EXPLANATION:its ANSWER HAI ACTIVATION ENERGY |
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| 42. |
Why is the probability of reaction with molecularity higher than three very rare? |
| Answer» TION:YES, the possibility of this happening is truly RARE, no legendary, no EPIC!! | |
| 43. |
For which type of reactions, order and molecularity have same value? |
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Answer» The order and the MOLECULARITY will be the same when the REACTION is an elementary PROCESS, ie it occurs EXACTLY as written. So, if the reaction A + B = C + D is an elementary process, ONE molecule of A collides with one molecule of B to give one molecule of C and one molecule of D. |
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| 44. |
A plot of log x/m vs log p for adsorption of gas on a solid gives in straight line with slope equal to (a) n (b)1/n (c) log k (d) -log k" |
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Answer» te here your ANS I think so first OPTION is correct..... I am not SURE... |
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| 45. |
The formation of micelles takes place only above (a) Inversion temperature (b) Boyle’s temperature (c) Critical temperature (d) Kraft temperature |
| Answer» MATION of MICELLES takes place only above a particular temperature CALLED Kraft temperature (TK) and above a particular concentration called CRITICAL micelle concentration (CMC). | |
| 46. |
In the Arrhenius equation, what does the factor e-Ea/RT corresponds to? [CBSE Sample Paper 2017] |
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Answer» ion of Arrhenius EQUATION. Note: The Arrhenius equation is sometimes expressed as K = Ae-E/RT where k is the RATE of chemical REACTION, A is a constant depending on the chemicals INVOLVED, E is the activation energy, R is the universal gas constant, and T is the temperature. |
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| 47. |
Coordination no. Of Li in Li2O (anti fluorite type lattice) |
| Answer» 4 Explanation:4 is COORDINATION no .of LI in GIVEN COMPOUND | |
| 48. |
How would you obtain clear water from a sample of muddy water? Explain the process with suitable diagrams |
| Answer» CLEAR water can be OBTAINED from a sample of muddy water by the process of filteration.In this method, the sample of muddy water is poured through a cloths having pores or through a fiter PAPER. water will pass through the filter MEDIUM and the mud left behind.could i made myself clear ?? | |
| 49. |
The COD value of a water sample is 40ppm.calculate the amount of acidified K2Cr2O7 required to oxidise organic matter present in 500 ml of that water sample. |
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Answer» what is COD..........................? |
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| 50. |
What is glycosidic linkage 40pts and follow me also |
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Answer» Glycosidic linkage is a type of COVALENT bond that joins a carbohydrate molecule to another GROUP, which MAY or may not be another carbohydrate. A glycosidic linkage is formed between the hemiacatel or hemiaketal group if a saccharide . |
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