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. |
When a liquid is cooled,it may change into a new state of matter. name the state |
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Answer» it form SOLID state of matterExplanation:because it's TEMPERATURE rise above melting POINT |
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| 3. |
Calculate the PH of solution having 10^-13 mol/L of OH- ions |
| Answer» EXPLANATION:The pH of a SOLUTION with a hydroxyl ion (OH-) concentration of 10−10 10 − 10 M is 4. This is because the POH of such a solution is 10 since that is the negative logarithm of its OH- ion concentration. The pOH and pH add up to 14. | |
| 4. |
Write few characteristics of synthetic fibres? |
| Answer» CHARACTERISTICS..... High Tensile StrengthShinyAur humme NAA AATA....... LOL.. | |
| 5. |
An electron moves from n=6 to n=3. which action takes place here?.find the energy absorbed or emitted by electron. |
| Answer» EXOTHERMIC REACTION is the ACTION TAKING PLACE here.. | |
| 6. |
Give chemical tests to differentiate between the following (WITH REACTIONS): 1. Pent-2-one and Pent-3-one 2. Methanol and Ethanol 3. Methanal and Ethanal 4. Acetophenone and Benzophenone |
| Answer» EXPLANATION:Pent2-oneCh3-C-CH2-CH2-CH3 || OPent-3-one CH3-CH2-C-CH2-CH3 || O2)METHANOL CH3-OHEthanolCH2-CH-OH3) METHANAL CH3-CHOEthanal CH2-CH-CHO | |
| 7. |
Tell me a correct answer of the attachment given Above .....❣️❣️❣️✨✨✨✨ |
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Answer» FLUIDITY :- in easy words , it means to flow. THEREFORE after CHANGING of liquid from gas , the fluidity INCREASES. ☆ more information :- ➡️ GASES have high fluidity then liquid. ➡️ in liquid, the fluidity is also KNOWN as Drag. ➡️ Gases have high fluidity. |
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| 8. |
which of the following pair of compound cannot act as buffer? HCl + NaHCO3, H3PO4 +NaH2PO4, HCOOH + NaCl |
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Answer» nh4clExplanation:cannot ACT as buffer bcz for being a buffer the SOLUTION MUST have weak ACID or base and the salt having CONJUGATE of that weak acid or base |
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| 9. |
Tell me a correct answer of the attachment given above..... ☺️✨✨✨❣️❣️❣️ |
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Answer» where is the ATTACHMENT........ ¿ ¿ TAKE CARE SIS !! |
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| 10. |
What does this suggest about the particles of solid and liquid? |
| Answer» UR QUES IS INCOMPLETEPLZZ ASK UR QUES PROPERLYTHNXMARK ME AS BRAINLIESTExplanation: | |
| 11. |
For a reversible process at equilibrium |
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Answer» The Second Law and EQUILIBRIUMA REVERSIBLE process is ONE which can be taken from its initial state to another state, and then back to the initial state without any change to EITHER the system or the surroundings.Explanation:PLZ mark me brainliest |
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| 12. |
Give an example of elastomers. |
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Answer» s of elastomers include NATURAL rubbers, styrene-butadiene block copolymers, polyisoprene, polybutadiene, ETHYLENE PROPYLENE rubber, ethylene propylene DIENE rubber, silicone elastomers, fluoroelastomers, polyurethane elastomers, and NITRILE rubbers.Hope it helps you. |
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| 13. |
Give one example of a condensation polymer? [AI 2013] |
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Answer» Examples of Condensation: 1. Having a COLD SODA on a hot day, the can "sweats." WATER molecules in the air as a vapor hit the colder SURFACE of the can and turn into liquid water. ... The mirror in the bathroom during a shower becomes foggy because warmer water vapor in the air hits the COOLER surface of the mirror. |
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| 14. |
What is the primary structure feature necessary for a molecule to make it useful in a condensation polymerisation reactioris? |
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Answer» hey dude....Explanation:The monomers for condensation polymerization have two main characteristics:. Instead of double bonds, these monomers have functional GROUPS (like alcohol, AMINE, or CARBOXYLIC acid groups). Each monomer has at least two REACTIVE sites, which USUALLY means two functional groupshope it helps you!!!plzzz mark me as a brainlist |
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| 15. |
Draw the structure of the monomer for the following polymer: Polypropene [Delhi 2012] |
| Answer» MARK ME AS BRILLIANT | |
| 16. |
What is the repeating structural unit in polythene polymer? [AI 2011] |
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Answer» The ethylene MOLECULE (H2C=CH2) is the REPEATING structural UNIT or MONOMER in polythene.Explanation:plz mark it brainliest |
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| 17. |
How does a homopolymer differ from a copolymer? [AI 2014(C)] |
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Answer» tion:The main difference between homopolymer and COPOLYMER is that homopolymers are produced by using a single type of MONOMER, WHEREAS copolymers are formed by using two different types of MONOMERS. |
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| 18. |
Define the term, ‘homopolymerisation’ giving an example. [Delhi 2013(C); 2012] |
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Answer» tion:a HOMEO polymer is a polymer where every monomer unit of a Chain is the samethe POLYMERIZATION of single type of monomerto form Homer polymer is called form of homopolymerisation for example polythene is the is the home of polymerization REACTION of polythene |
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| 19. |
A homopolymer or a copolymer? [AI 2013; NCERT] |
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Answer» it is homopolymer because it is obtained from single MONOMER UNIT,NH2 - CHR - COOH |
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| 20. |
Which of the following pair of compound cannot act as buffer? HCl + NaHCO3, H3PO4 +NaH2PO4, HCOOH + NaCl |
| Answer» HCOOH +NACL ND hcl+nahco3 | |
| 21. |
A homopolymer or a copolymer? [AI 2013] |
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Answer» ng are the different types of MANURE used by the farmers:GREEN Manure. Green manure INCREASES the percentage of ORGANIC matter in the soil. ...Farmyard Manure. Farmyard manure improves the soil structure and is used as a natural fertilizer in farming. ...COMPOST Manure. |
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| 22. |
Identify the type of polymer given in the following figure. [HOTS] |
| Answer» CROSS LINK POLYMER.....HOPE THIS WILL HELP U | |
| 23. |
What are synthetic polymers? |
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Answer» Synthetic polymers are an attractive CLASS of materials due to the ability to TAILOR the MATERIAL PROPERTIES for specific applications such as altering the molecular weight or CHEMISTRY to influence degradation or mechanical properties. |
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| 24. |
Give an example of linear and branched chain polymer each. |
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Answer» Polyethene, PVC. Branched chain POLYMERS: The polymers made up of main chain(linear chain) with smaller chains as BRANCHES of mainchain are CALLED branched chain polymers. They have lower melting POINTS, densities and tensile strength as compared to linear polymers.Example: Polypropylene. |
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| 25. |
Derive integrated rate equation for first order kinetic |
| Answer» RATE of REACTION = V = -d[A]/dt = d[B]/dt = k1[A] where k1 is the 1st-order rate constant for the FORWARD reaction, [A] is the reactant concentration, and [B] is the product concentration. The rate of the reaction (or its velocity v) is given either by the rate of disappearance of [A] or APPEARANCE of [B]. | |
| 26. |
Give one example of an oxidation reduction reaction which is also:(i) A combination reaction (ii) A displacement reaction |
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Answer» o the above ATTACHMENT!! |
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| 27. |
Give answer and explaination of questions . |
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Answer» d.bothAandC are CORRECT |
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| 28. |
Which of the following is incorrect? a). solids have fixed shape and volume. b). liquids have fixed volume but not shape. c). gases have neither fixed shape nor volume. d). the particles have least intermolecular space but maximum kinetic energy in liquid |
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Answer» ongHop this will HELP you |
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| 29. |
solution of Barium Chloride and sodium sulphate in water react to give insoluble Barium sulphate and the solution of sodium chloride write a chemical equation |
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Answer» tion:Explanation: When a solution of barium chloride and sodium SULPHATE in water reacts to GIVE insoluble barium sulphate and the solution of sodium chloride then this REPRESENTS a double displacement reaction. As in a double displacement reaction there is EXCHANGE of two IONS between the two compounds |
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| 30. |
if wavelength of a radiation is 6200A is emitted from a source.How many waves are produced in 1second and what is the wave number |
| Answer» INFINITELY manyExplanation: | |
| 31. |
Three atoms P, Q and R crystallize in a cubic solid lattice where P atoms are at the alternate faces, R atoms are at the centre of edges and Q atoms are at the rd of the total corners present, hence the formula of the compound is |
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Answer» Explanation: P atoms are at corners. There are 8 corners and contribution of each corner is 8 1 . Therefore, total P ATOM is 8× 8 1 =1. Q is at the centre of the cube. Therefore, total Q atom is 1. R are present at the EDGES. There are 12 edges and contribution of each EDGE is 4 1 . Total R atoms are 4 1 ×12=3. Formula is PQR 3 |
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| 32. |
Give an example of semi-synthetic polymer. |
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Answer» Semi-synthetic POLYMER - CELLULOSE DERIVATIVES such as, cellulose ACETATE (rayon) and cellulose nitrate etc. are the usual examples of this SUBCATEGORY. Rubber, Silk and wool are examples of natural polymers because they are found in plants and animals |
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| 33. |
Is Nylon 6, 10, synthetic fibre. [True/False] |
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Answer» Nylon is a generic designation for a FAMILY of synthetic polymers, based on aliphatic or semi-aromatic polyamides. Nylon is a THERMOPLASTIC silky material that can be melt-processed into FIBERS, films, or shapes. ... Nylon was the first commercially successful synthetic thermoplastic POLYMER. |
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| 34. |
Is Melamine-formaldehyde resin, a thermosetting polymer. [True/False] |
| Answer» TION:कविता का भाव अपने शब्दों में लिखिए | |
| 35. |
Which of the following is natural polymer? Buna-S, Protein, PVC [Chennai 2019; AI2014] |
| Answer» RIGHT ANSWER is proteinExplanation: | |
| 36. |
A copolymer can be addition or condensation. [True/False] |
| Answer» TRUE .........EXPLANATION:PLEASE MARK as BRAINLIST | |
| 37. |
Trans-polyisoprene, a rubber like material is called __________ . |
| Answer» | |
| 38. |
High density polythene __________ polymer of ethene. |
| Answer» HIGH density POLYTHENE High-density polyethylene POLYMER of ETHENE . | |
| 39. |
Assertion: Rayon is a semi synthetic polymer and is taken as a better choice than cotton fabric. [NCERT Exemplar] Reason: Mechanical and aesthetic properties of cellulose can be improved by acetylation. |
| Answer» | |
| 40. |
Assertion: Olefinic monomers undergo addition polymerisation. [NCERT Exemplar] Reason: Polymerisation of vinyl chloride is initiated by peroxides/ persulphates. |
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Answer» tion:Assetion and reson both are correct but REASON does not explain ASSERTION Olefin monomers underogo addition polymerisation because it add on to other monomers of olefine through free radical mechanism due to the presoecne of peroixide initiator and double bond and PRODUCES HIGH MOLECULAR mass polymers |
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| 41. |
Assertion: Most of the Synthetic polymers are not biodegradable. [NCERT Exemplar] Reason: Polymerisation process induces toxic character in organic molecules. |
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Answer» tion:ASSERTION is CORRECT STATEMENT but reason is not correct statement .Most of synthetic POLYMERS are not biodergradable because they are not easily broken by soil ORGANISMS and hazardous to the environment |
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| 42. |
Match the polymers given in Column I with the preferred mode of polymerisation followed by their monomers. [NCERT Exemplar] |
| Answer» TION: HELLO BROTHER where is the FIGURES | |
| 43. |
Match the polymers given in Column I with their main applications given in Column II. [NCERT Exemplar] |
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Answer» What is the QUESTION???????? |
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| 44. |
O Weigh a rubber balloon Now inflate it and weight itagain. Which is heavier and and way? |
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Answer» Can you PLEASE POST this question again. It is sort of WRONG I guess Explanation: |
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| 45. |
Class 9th m jo biology, chemistry, physics ke notes teacher's provide kr te h vo copy m krne hote h ya nhi |
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Answer» sure KRNA hogea kyuku wo mst imp HOTA h too woExplanation:jrrori h karana wo bhi Aachen SE PLS mark as BRAINLIST |
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| 46. |
Write the basic radicals and acidic radicals of the following and then write the chemical formulae of thesecompounds.(a) Barium sulphate |
| Answer» BASIC is basic in NATURE and ACIDIC is acidic in nature.Baso4 | |
| 47. |
Balance the following equation s i) PbS + O2 = PbO + SO2ii) C + HNO3 = CO2 + H2O + NO2iii) NH3 + O2 = N2 + H2O |
| Answer» 1) 2PbS + 3O2 = 2PbO + 2SO22) C + 4HNO3 = CO2 + 4NO2 + 2H2O3) 4NH3 + 3O2 = 2N2 + 6H2OExplanation: | |
| 48. |
The measure of degree of hotness or coldness is known as |
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Answer» The measure of DEGREE of hotness or coldness of a BODY is CALLED temperature.... HOPE IT HELPS YOUPLZZ MARK ME AS BRAINLIESTPLEASE MARK ME...... |
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| 49. |
Guys answer all answers fastly!!! plz |
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Answer» Answer 1= Sublimation means convert from solid state to gaseous state directly. Answer 3=Ammonium chloride, dry ice,Naphthalene balls ETC. Answer 4=Naphthalene balls disappeared because they performed the sublimation process. Please don't FORGET to mark it as BRAINLIEST and ALSO click on a small HEART and follow me |
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