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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. |
2Which of the following has maximum mass :(1) 0.1 gram atom of carbon(3) 6.02 x 1022 molecules of hydrogen |
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Answer» Answer: your answer is (3) I hope it's help you MARK me BRAINLEST... by |
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| 2. |
3. Balance the following redox reaction by oxidation number methodMnO2 + Br - Mn + Br2 + H2O (Acid medium) |
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Answer» SEE the images!!!!! Balance the following redox reaction by oxidation NUMBER method |
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| 3. |
using Bohr's theory derive the expression for the wavelength of the radiation emitted when the electron from H atom jumps from to ? |
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Answer» Answer: Mark as brainliest Explanation: Using Bohr's postulates, derive the expression for the frequency of radiation emitted when electron in hydrogen atom undergoes TRANSITION from higher energy state (quantum NUMBER ni ) to the LOWER state, (NF ). ... That is, when electron jumps from ni = 4 to nf = 3.21 . |
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| 4. |
What is the formula for the compound dinitrogen pentoxide?A. N4O5B. N5O4C. N4O6D. N5O2E. N2O5 |
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Answer» N205...IS THE FORMULA OF DINITROGEN PENTOXIDE ❣♚Quεεn♕❣ |
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| 5. |
5. Which letter is least like the other four?T X L V Y |
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Answer» qii-mnzx-pqd Explanation: |
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| 6. |
An atom of an element is electrically neutral. Give reason (in brief) |
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Answer» Answer: Because in an atok the TOTAL number of positives that's protons are EQUAL to negative CHARGED that's ELECTRONS so that's why the CHARGE is neutral |
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| 7. |
The current flowing through the solution at a particular applied potential when no electrolytic process is occurring is known as ___________ current. |
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Answer» ELECTRIC current |
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| 8. |
Cotton is solid but it floats on water why? |
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Answer» It has LESS density Explanation: Cotton is a solid and it FLOATS in the water due to its low density. Brainliest |
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| 9. |
Write IUPAC NAMES OF FOLLOWING COMPOUND |
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Answer» Answer: a)2,6-diethyl heptane b)3-methylphenol Explanation: 1st QUESTION on 2nd and 6th POS ethyl group 7 C chain so is the name 2nd ques 3rd position or META position methyl grp is there thus is the name common name of ques 2 is meta methyl phenol or more appropriately we say it meta cresol common name [Phenol= benzene+OH grp] hope I HELP u understand |
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| 10. |
D. Write T for True and F for False. Correct the false statement(s).1. Apart from solid, liquid, and gas, there are two more states of matter-Plasma andEinstein2. Air, carbon dioxide, water, and steam are fluids.3. Most gases can be seen with our naked eyes.4. A molecule is the smallest unit of matter.5. Eight sulphur atoms join to form a sulphur molecule. |
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Answer» Explanation: 1) TRUE (there are 5 states of matter) 2) True (GASES are fluid form of matter) 3) I think FALSE(AIR is a gas and it can't be seen with our naked eye) 4) false (ATOM is the smallest unit of matter) 5) I don't know (I think yes but I do not know) |
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| 11. |
How can you measure the rate of decomposition of sodium chlorate |
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Answer» Thermogravimetry (TG) and differential scanning calorimetry (DSC) were USED to study the catalytic decomposition KINETICS of SODIUM chlorate. |
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| 12. |
Conductivity in polymer is observed because of .... bond system |
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Answer» conductivity in polymer is OBSERVED because of conjugated bond system .
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| 13. |
Which is the commonly used reducing agent used in theextraction of metals? |
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Answer» Answer: Reduction is the process of removal of oxygen for EXTRACTION of metals from their OXIDE ores. The common reducing agents used for reduction of METAL oxides are: Carbon monoxide, Carbon, HYDROGEN. |
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| 15. |
애CH33 write IUPAC name of the following compounds |
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| 16. |
Which of the following solutions shows no current flow in an elecrolytic cell |
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Answer» Explanation: To an external wire connected to the electrodes of a galvanic cell (or battery), forming an electric circuit, the cathode is POSITIVE and the anode is NEGATIVE. Thus positive electric current flows from the cathode to the anode through the external circuit in the case of a galvanic cell ____________________________ Hope it will be HELPFUL |
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| 17. |
Grignard reagents is reactive due to |
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Answer» In a Grignard reaction, alkyl-, aryl-, vinyl organomagnesium halide compounds react with molecules that have polarized bonds, including ketones, esters, aldehydes, organic acids, nitriles, and amides. These organomagnesium halide compounds, known as Grignard reagents, are nucleophiles that attack the electrophilic carbon atom in, for example, carbonyl bonds. Grignard reactions are important due to their ability to form carbon-carbon bonds. Grignard reagents are strong bases and will react with protic compounds which makes them exceedingly valuable tools for organic synthesis. As an example, organomagnesium halides will undergo addition to the carbonyl bond of a KETONE or aldehyde forming an ADDUCT which is then hydrolyzed to form an alcohol. Hundreds of different alcohols have been synthesized via the Grignard reaction. Importance of Grignard Reactions Importance of Grignard Reactions Effective Production of C-C Bonds The value of the Grignard reaction cannot be overstated. In general, Grignard reactions represent one of the best ways in organic chemistry to produce C-C bonds and enable the coupling of alkyl chains. For example, Grignard reagents are FREQUENTLY used to alkylate aldehydes and ketones. There are few reagents available to the chemist that are as effective as Grignards for C-C bond formation. Carbon is more electronegative than magnesium, and the metal-carbon bond in Grignard regents is quite ionic. These carbanions are quite nucleophilic and readily react with electrophilic groups such as carbonyl moieties. Thus, Grignard reagents react with formaldehyde to form primary alcohols, with aldehydes to form secondary alcohols and ketones, and esters and acid halides to form tertiary alcohols. Reactions of various organic compounds with Grignard reagents yield amines, ketones, nitriles, thiols, aldehydes, etc. Grignard reagents can react with a variety of halides to form carbon-hetero atom bonds. Safety Considerations in Grignard Reagent Synthesis Minimizing Hazard with Inline Reaction Monitoring Due to the exothermicity of Grignard formation, as well overall reactivity of Grignard reagents, synthesizing them can be particularly hazardous. Notwithstanding, the formation of Grignard reagents and subsequent Grignard reactions are widely used in the production of fine chemical and pharmaceutical compounds. The synthesis of a Grignard reagent may have a variable induction period associated with an autocatalytic process that accelerates the formation of radicals on the magnesium metal. Although the reaction may be slow to initiate, as the NUMBER of magnesium radicals quickly INCREASE, the reaction may advance rapidly with concurrent significant heat release. If not well controlled, this issue of induction period followed by rapid initiation may result in a runaway reaction. The variability and overly-lengthy induction period is often due to the presence of trace impurities in solution, or passivity caused by an oxide layer on the magnesium surface. Overdosing the organohalide during this period exacerbates the hazardous nature of the reaction when initiation occurs. The issues associated with reagent and reactant purity, the type of Grignard reagent formed, and reaction variables need to be carefully understood and controlled. For this reason, chemists and engineers have turned to the RC1mx reaction calorimeter to measure the exothermicity of Grignard reactions, and ReactIR to monitor the organic halide concentration dosing and to track the formation of the Grignard reagent. The use of heat and mass balance online monitoring reveals the link between reaction variables and reaction performance, ensuring the safety of Grignard reagent synthesis. |
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| 18. |
The degeneracy of a He+ ion in 3rd excited state is |
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Answer» Answer: ANNOUNCEMENT was made with BOOKS of EXCITEMENT and congratulation he he was that he would certainly be enough TEMPERATURE and BEGIN |
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| 19. |
1. Differentiate between (two points each)a. Combination and Decomposition reaction.b. Physical and chemical changes |
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Answer» Answer: COMBINATION means FORMATION of compound decomposition means breaking of compounds ex PCL5 gives rise to PCl3+Cl2 |
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| 20. |
find out the concentration of unknown solution of oxalic acid in gram per litre given in bottle 'b'. for this purpose standard solution of crystalline oxalic acid is given in bottle 'a' having molarity m/30 intermediate solution is sodium hydroxide (indicator :- phenolphthalein) |
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| 21. |
vii) The following compounds will give positive Fehling's test.a. Propandaneb) Pentan-3-onec) Butanoned) Butan-2-ol |
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Answer» s5euut8t8e8r0fi3 11100011 15678 967 2310 Explanation: and 7
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| 23. |
प्रश्न-10, डाइऐजोटीकरण से क्या समझते हो? विलयन रूप में डाइऐजो यौगिक किस प्रकार बनाये जातेहै? बेजीन डाइऐजोनियम क्लोराइड की संरचना की विवेचना कीजिए।Q-10, What is meant by diazotisation? How diazo compounds are prepared I the solution!Discuss the constitution of diazonium chloride |
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Answer» Answer: Diazonium compounds or diazonium salts are a group of organic compounds sharing a common functional group R−N+ 2X− where R can be any organic group, such as an alkyl or an aryl, and X is an inorganic or organic anion, such as a halogen.  Benzenediazonium cation General properties and reactivity Preparation Diazo coupling reactions Displacement of the N2 group Meerwein reaction Metal complexes Other methods for dediazotization Grafting reactions Reduction to a hydrazine group Biochemistry Applications Safety See also References External links Last edited 9 days ago by Shhhnotsoloud RELATED ARTICLES Aryl halide Sandmeyer reaction Chemical reaction used to synthesize aryl halides from aryl diazonium salts Benzenediazonium chloride Organic COMPOUND containing an –N≡N+ function  The chemical process used in converting a primary aromatic amine into the CORRESPONDING diazonium salt of the amine is commonly REFERRED to as DIAZOTIZATION. ... Generally, the preparation of these diazonium salts involves the reaction of an aromatic amine with nitrous acid in the presence of another acid. |
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| 24. |
Why heat of adsorption is greater for chemisorption than physiosorption |
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Answer» Answer: Chemisorption has higher heat of adsorption, because in chemisorption the chemical bonds are much stronger. In adsorbed state the ADSORBATE is hold on the surface of adsorbent by attractive FORCES (bond). ... Therefore, heat of adsorption is greater for chemisorptions than physisorption. |
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| 25. |
Iron will not rust in outer space |
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Answer» Answer: Rusting procces occurs only when IRON PARTICALS come in CONTACT with oxygen, as there is no oxygen is outer SPACE, rusting of iron cannot TAKE place. PLEASE MARK ME AS A BRAINLIST |
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| 26. |
The resistivity of a 0.2M solution of electrotyte is 35 10 X cm − Ω , calculate its molar conductivit |
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Answer» Your answer is in the IMAGE |
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| 27. |
IUPAC NAME OF CH3 =CHCH=CHCH3 |
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Answer» hex-2,5-ene Explanation: hex-2,5-ene |
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| 28. |
How do aqeous solution of ionic compound conduct electricity ? |
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Answer» <STRONG>Answer: Aqueous solution of ionic compounds is able to conduct electricity because in aqueous solution, the strong force of ATTRACTION between IONS is vanished. Their CONSTITUENT ions get SEPARATED and become free to move across the solution. |
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| 29. |
Electricity is generated in _______________House power plant |
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Answer» ELECTRICITY is GENERATED in POWER plant. Hope it HELPS you. ☺ |
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| 30. |
Definition of elimination reactions. |
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Answer» Answer: here's UR answer Explanation: An elimination reaction is a type of ORGANIC reaction in which TWO substituents are REMOVED from a molecule in either a one- or two-step mechanism. The one-step mechanism is known as the E2 reaction, and the two-step mechanism is known as the E1 reaction. |
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| 31. |
Practice Problem 3: A compound of natural origin found to contain 3.6 g A and 13.2 B. To synthesisthe same compound, mass of B needed for 16.8 g A is ? |
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Answer» |
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| 32. |
Choose the correct sequence of electronegativity between be, b, c, n |
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Answer» The Correct SEQUENCE of ELECTRONEGATIVITY is: BeC N>C>B>Be .... In Descending order I hope this helps. |
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| 34. |
Which of the following is an alkali?a.Fe(OH)2b.Cu(OH)2c.Zn(OH)2d.NaOH |
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Answer» Explanation: NaOh is an alkali because it is soluble in water.But others are not soluble in water. PLEASE MARK ME AS A BRAINLIST |
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| 35. |
4 g of hydrogen gas contains the number of molecules * 〖6.022Ⅹ10〗^23 2 Ⅹ〖6.022Ⅹ10〗^23 4Ⅹ 6.022Ⅹ10〗^23 3.011Ⅹ10〗^23 |
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Answer» ANSWER IS = 458,734,885,611.71 |
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| 36. |
Why there is a break in the third period elements of the long from of the periodic table. |
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Answer» Answer: The third period contains EIGHT ELEMENTS: SODIUM, magnesium, ALUMINIUM, silicon, phosphorus, sulfur, chlorine, and ARGON. ... All of the period 3 elements occur in nature and have at least one stable isotope. |
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| 37. |
OBJECTIVE TYPE QUESTIONSA. Fill in the blank spaces by choosing thecorrect words from the list given below:List : incompressible, plasma, spaces, onlyone, volume1. Liquids can have_____freesurface.2. Solids are ____3. Gases have neither definite_______nor definite shape.4._____ state of matter consists ofelectrically charged particles of gaseousmatter. |
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Answer» Answer: 1- spaces 2- incompressible 3- volume 4- plasma Explanation: |
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| 38. |
E give Synthesis fromEAA Ovaleric acid2) crotonic acid |
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Answer» Answer: d Feb be en be SC R1 WEB it en j CT you to the Explanation: zs V1 2G V1 WB ber kore ANLAM ar you x do ages SC vs web be WB NEW web be we |
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| 39. |
What is the concentration of Ba(CN)₂ in the aqueous solution of the mixture of Ba(CN)₂ and 0.1 M HCN having pH = 5 ? Given; pKb for CN⁻ at 25°C is 8 :- don't spam answer correctly only if you know.I will mark the perfect answer with exclamation as brainliest. |
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| 40. |
When is evidence returned to its owners after it is no longer needed?choices - A. when the owners have signed the chain of custodyB. when the physical evidence is admissible in the courtC. when the physical evidence is undisturbedD. when it is legal for the owners to own the physical evidence |
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Answer» when the OWNERS have signed the chain of custody B. when the physical EVIDENCE is ADMISSIBLE in the court C. when the physical evidence is undisturbed D. when it is legal for the owners to own the physical evidence |
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| 41. |
Micromolecules have 10% of |
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Answer» Answer: Biological macromolecules all contain carbon in ring or chain form, which means they are classified as organic molecules. They USUALLY also contain hydrogen and oxygen, as WELL as NITROGEN and ADDITIONAL minor elements. PLEASE MARK ME AS A BRAINLIST |
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| 42. |
What is actinides contraction |
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Answer» Answer: Actinoid CONTRACTION refers to the gradual decrease in the IONIC radii with increase in atomic NUMBER of ACTINOIDS. ... In the actinoid SERIES, the nuclear charge and number of 5felectrons increases by one unit Explanation: |
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| 43. |
How can sawdust be seperated from drinking water |
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| 44. |
write a short note on the problems related to the increase in the amount of CO2 in the atmosphere and its remedial measures chemistry |
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Answer» Answer: Effects of Increasing Carbon Dioxide Levels and Climate Change on Plant Growth, Evapotranspiration, and Water Resources Leon Hartwell ALLEN, Jr. U.S. Department of Agriculture Gainesville, Florida The atmospheric carbon dioxide CONCENTRATION has risen from about 270 parts per million (PPM) before 1700 to about 355 ppm today. Climate changes, including a mean global surface temperature rise of between 2.8 and 5.2°C, have been predicted by five independent general circulation models (GCMs) for a doubling of the carbon dioxide concentration. The objectives of this paper are to examine plant responses to rising carbon dioxide levels and climatic changes and to interpret the CONSEQUENCES of these changes on crop water use and water resources for the UNITED States. Explanation: mark me branliest |
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| 45. |
write one chemical equation to represent each of the following types of reactions of organic substances |
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Answer» Answer: saponification Explanation: Saponification is the reaction of ALKALINE hydrolysis of ETHYL ethanoate. The Ethyl ethanoate is heated by addition of Sodium hydroxide results in formation of Sodium Ethanoate and ETHANOL. Thus reaction is USED for making SOAPS. |
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| 46. |
Give me the aim, materials required, observations and conclusion of sublimation |
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Answer» Answer: draw a LABELLED DIAGRAM ti show when a METAL oxide reacts with H2O to form ENERGY |
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| 47. |
फेरस सल्फेट के जलीय विलियन के साथ जस्ता एवं कॉपर धातु के अभिक्रिया का अध्ययन कीजिए |
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Answer»
के निर्माण की विधियों, भौतिक एवं रासायनिनिम्न के रासायनिक सूत्र एवं आईयूपीएसी नाम लिखिए सरका ग्लूकोज पॉलिथीन जाएगी शराब क्लोरोफॉर्मक गुणों की विवेचना कजिएफेरस सल्फेट के जलीय विलियन के साथ जस्ता एवं कॉपर धातु के अभिक्रिया का अध्ययन कीजिए
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| 48. |
If you are asked to make a rope using fibre which one would you prefer - cotton , jute or jutton |
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Answer» Jute Explanation: |
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| 49. |
Which of the following materials are heavier than water and which are lighter than water Chauk while copper I send monium wood stone kerosene |
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