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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. |
A molecule of an element or a conpound is represented by its |
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Answer» ule of an ELEMENT or compound is REPRESENTED by its symbol or chemical FORMULA. |
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| 2. |
Mass of 22.4dm3of N2 at stp |
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Answer» 1dm^3=1 litreExplanation:22.4 lit of N2 gas mass is it's Molecular mass= 14×2= 28 GRMS |
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| 3. |
0.1 gram mole of urea dissolved in 100g of water. the molality of solution is |
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Answer» 7.45g of potassium chloride is dissolved in 100g of WATER. What will be the molality of the SOLUTION ? More Related QUESTION |
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| 4. |
Which of the following is a mixture? A. Salt B. Sugar C. Water D. Air |
| Answer» AIR is answer.Explanation:HOPE it HELPS you! | |
| 5. |
A.evaporation of a liquid at a room temperature leads to ____effect b.at room temperature the forces of attraction between particles of solid substance are_____those which exists in gases. |
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Answer» A. COOLINGB.HIGHER THANExplanation:PLS MARK MY ANS. AS THE BRAINLIEST AND FOLLOW ME!!!!!!!!!!!!!!!!!!!!! |
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| 6. |
संतृप्त विलयन से क्या तात्पर्य है इसे गर्म करने या ठंडा करने पर इस पर क्या प्रभाव पड़ता है? |
| Answer» TION:दो या दो से अधिक पदार्थों के समांगी मिश्रण को विलयन कहते हैं। किसी निश्चित तापमान पर विलयन के उपादानों का आपेक्षिक अनुपात एक सीमा तक परिवर्तित किया जा सकता है। जब चीनी को पानी में घोला जाता है तो एक समांगी मिश्रण बनता है। यह समांगी मिश्रण चीनी का पानी में विलयन कहलाता है।ठंडा करने पर दो परत में बट जाता है और गर्म करने पर घुल जाता है।Mark me as a BRAINLIST THANKYOU | |
| 7. |
Please write the use of sodiumdicyanideargentate........ |
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Answer» the people use the PERSON is sodium and ready to GO the sodium BICARBONATE is the very HARMLESS for the body |
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| 8. |
Please help me with this numerical on Vapour Density and Molecular Weight D. 2009 |
| Answer» USE this FORMULA | |
| 9. |
Define homologuos series of carbon compounds .mention any two characteristics of homologuos series |
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Answer» A series of COMPOUNDS having SIMILAR structural formulae, same functional group and hence similar chemical PROPERTIES are called homologous series of compounds. CHARACTERISTICS of homologous series: ... Any two adjacent members of a homologous series differ by a CH2 UNIT in their molecular formulae |
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| 10. |
What are the disadvantages of synthetic fibres? |
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Answer» hey mate good afternoon ur ANSWER is in above figure... if u are SATISFIED with my answer pls MARK my answer as brainliest .... |
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| 11. |
Real gas pressure is |
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Answer» hat DEVIATE from ideality are known as Real Gases, which originate from two factors: (1) First, the theory ASSUMES that as pressure increases, the volume of a gas becomes very small and approaches zero |
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| 12. |
3)Why is the symbol for carbon 'C', but for mercury 'Hg' and for Bromine‘Brº? |
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Answer» its SIMPLY because the carbon comes at the beginning of the periodic table and MERCURY is hg because its greek WORD BEGINS from hg and carbon STARTS fromC and bromine because it starts from BrExplanation: |
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| 13. |
The correct representation of the orbital with n=4, l=2 is: |
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Answer» 4dExplanation: |
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| 14. |
Explain interconversion of three states of matter with the help of flow chart . Name the process of each interconversion |
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Answer» the FLOWCHART is given-Explanation: |
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| 15. |
Which of the following is a physical change? a). cooking of food b). Rusting of iron. c). Freezing of water. d). Digestion of food. |
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Answer» FREEZING OF WATER IS A PHYSICAL CHANGE.Explanation:Water can be CHANGED into iceand ice can be changed into water(interconvertable)HENCE IT IS PHYSICAL PROCESSHOPE IT HELPS YOU......MARK ME AS BRAINLIEST ANSWER........ |
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| 16. |
1. If we dissolve crystals of potassium permanganate in water in a beaker without stirring then we will observe: a) The process of evaporation, as potassium permanganate gets converted into gaseous state. b) The process of diffusion as the particles of KMnO4 gets diffused into water. c) The process of sublimation, as the particles of potassium permanganate get sublimed. d) Potassium Permanganate cannot dissolve itself into water. 2.When we open a water tap and try to cut the stream with our fingers, then a) we cannot cut the stream of water as particles of water attract one another. b) we cannot cut the stream of water as intermolecular attraction is not present in water molecules. c) we can cut the stream of water as there is permanent intermolecular force of attraction in it. d) we can cut the stream of water as there is no intermolecular force of attraction among particles of water 3.Solid, liquid and gas are called the three states of matter. 4. The smell of perfume gradually spreads across a room due to ______. 5. Why we are able to move our hand through the air but cannot do so through a wooden door or wall? 6. Mention two characteristics of the particles of matter. 7. The smell of hot cooking food reaches us faster than that of cold food from the fridge? |
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| 17. |
1. A liquid and a solid are found together in a single phase. What is this known as [ ] a) Solution b) Solute c) Solvent d) Emultion2. What are the materials which contain atleast two pure substances and show the properties of theirconstituents called [ ]a) A compound b) An element c) A mixture d) A solution3. Which of the following is an example of a mixture ? [ ]a) Sugar b) Brass c) CO2d) NO24. What type of mixture is steel ? [ ]a) Solid - liquid heterogeneous mixture b) Solid - solid heterogenous mixturec) Solid - liquid homogeneous mixture d) Pure substance5. Identify a pure substance from the following ? [ ]a) Steel b) Magnesium c) Ammonia d) Gun powder6. A solution which contains more amount of solute is called [ ]a) Dilute solution b) Concentrated solutionc) Aqueous solution d) All7. Mass by volume percentage of a solution is equal to [ ]a) 100 Mass of soluteVolume of solution b) 100 Mass of soluteMass of solutionc) 100 Mass of solventMass of solution d) All8. The amount of solute present in a saturated solution at a given temperature is called [ ]a) Solution b) Solvent c) Solubility d) Saturated solution9. Which of the following is homogeneous mixture [ ]a) Salt + water b) Sugar + water c) Alcohol + water d) All10. When no more solute can be dissolved in the solution at a given temperature is known as[ ]a) Unsaturated solution b) Saturated solutionc) Supersaturated solution d) Dilute solution |
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Answer» a-solution b-compound c-brass |
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| 18. |
Sodalime is the mixture of NaOH and CaO are in ratio |
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Answer» tion:SODA limePubChem CID: 66545795Structure: Find Similar StructuresChemical Safety: Laboratory Chemical Safety SUMMARY (LCSS) DatasheetMolecular FORMULA: CaHNaO2Synonyms: 8006-28-8 soda-lime Sodasorb Soda lime [NF] Sodium hydroxide (Na(OH)), MIXT. with lime More.. |
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| 19. |
Which is the reducing agent used to extract Aluminium from Alumina? .Carbonmonoxide.Electricity.Carbon |
| Answer» NG to Hall's process aluminium is PRODUCED by the ELECTROLYTIC reduction of aluminaHope it's HELPFUL | |
| 20. |
Which of the following is an example of gas in liquid solution? A. Alloy B. Aerated drink C. Camphor in air D. Air |
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| 21. |
B) Observe the table and answer the following. Hydrocarbon butene pentyne ethyne methane propene butane hexane etheneMolecular formula C4H8C5H8C2H2CH4C3H6C4H10 C6H14 C2H4i) Identify the saturated hydrocarbons in the given table.ii) What is the general formula for alkynes ?iii) What is the simplest alkene given in the table ?iv) Identify the hydrocarbons in which double bond is present. |
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| 22. |
Observe the table and answer the following. Hydrocarbon butene pentyne ethyne methane propene butane hexane etheneMolecular formula C4H8C5H8C2H2CH4C3H6C4H10 C6H14 C2H4i) Identify the saturated hydrocarbons in the given table.ii) What is the general formula for alkynes ?iii) What is the simplest alkene given in the table ?iv) Identify the hydrocarbons in which double bond is present. |
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Answer» 6h14cnh2n-2ch4c2h2 |
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| 23. |
Name the method used to concentrate bauxite? . leaching. hydraulic Washing. magnetic separation |
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Answer» Hydraulic WASHING..... Is the answer Follow me MARK me as BRAINLIST HOPE it is helpful............. |
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| 24. |
9. __________ is used to determine the approximate concentration of glucose in the blood |
| Answer» BLOOD TEST is USED to DETERMINE the glucose CONCENTRATION in blood | |
| 25. |
When 50 ml of Ethanol is dissolved in 250ml of water. Calculate its concentration in terms ofvolume by volume percentage of solution. |
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Answer» e...!Thanks for the question ....!We have,Volume of SOLUTE (ethanol) = 50 ML Volume of SOLVENT = 250 ml.Volume of solution = 50 + 250 = 300 ml.Therefore, Volume by volume PERCENTAGE of solution = 50/300 × 100= 100/6= 50/3 % |
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| 26. |
What is the composition of resultant mixture |
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Answer» each of WATER GAS and OXYGEN are ignited and the resultant mixture of gases cooled to ROOM TEMPERATURE |
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| 27. |
Which of the following will produce severe burns? a). cold water. b). boiling water. c). hot water. d). Steam |
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Answer» steam never UNDERESTIMATE this it can BURN your whole body |
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| 28. |
Explain he Solvay process for the manufacturing of NaOH |
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Answer» Video ExplanationVideo ExplanationIn SOLVAY process, also known as ammonia SODA process, carbon dioxide is passed through a BRINE solution (containing about 28 % NACL) which is saturated with ammonia to form sodium carbonate. The precipitate of sodium bicarbonate is filtered, dried and ignited to form sodium carbonate.N |
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| 29. |
Which of those given below is an alloy steel .nichrome. brass. bronze |
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Answer» I THINK BRASS is the ANSWEREXPLANATION: |
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| 31. |
ZnCO3+HNO3 gives Zn(NO3)2+H2O+CO2 balance the equation |
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Answer» ZnCO3+2HNO3 GIVES ZN(NO3)2+H20+CO2above is the BALANCED EQUATION |
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| 32. |
Which of the following is heterogeneous? A. Air B. Steel C. Iodised table salt D. Brass |
| Answer» STEEL is a HETEROGENEOUS EXPLANATION:please MARK me BRAINLIEST | |
| 33. |
write two points of difference between a polar and non polar covalent compound with one example each |
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Answer» done this but I don't know the EXAMPLES..sryMy ANSWER in the PICTURE I have sent..MARK MY ANSWER AS BRAINLIEST.. |
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| 34. |
An organic compound X with the formula C3H6O on oxidation gives a compound Y with the formula C3H6O2. The compound X should be |
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Answer» hey mate here's UR answerExplanation:By molecular formula, it can be CONCLUDED that, it is an alcohol and terminal ALCOHOLS can UNDERGO oxidation.CH3CH2CH2OHoxidationCH3CH2COOHSo, X is propanol.PLZZ MARK ME AS BRAINLIST☺ |
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| 35. |
Convert the temperature of 173 k to the celsius scale |
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| 37. |
The physical states of a matter depends upon |
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| 38. |
Does ch3 ch2 ch N oh show geometric isomerism |
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Answer» This is “Cis-Trans ISOMERS (Geometric Isomers)”, section 13.2 from the book Introduction to Chemistry: General, Organic, and BIOLOGICAL (v. 1.0). For details on it (including licensing), CLICK here.For more information on the source of this book, or why it is available for free, please see the project's home PAGE. You can browse or download additional books there. To download a .zip file containing this book to use offline, simply click here. |
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| 40. |
Sketch a tetrahedral void |
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Answer» tion:Topoisomerase: A class of ENZYMES that alter the SUPERCOILING of double-stranded DNA. (In supercoiling the DNA MOLECULE coils up LIKE a telephone cord, which SHORTENS the molecule.) The topoisomerases act by transiently cutting one or both strands of the DNA. |
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| 41. |
The frequency of an electromagnetic radiation which makes 2*10^6 waves per 50 cm is? (1)1.2*10^15 Hz (2) 150 Hz (3)6*10^14 Hz (4)1.2*10^13 Hz |
| Answer» OPTION 1Explanation:1.2*10^15Hzplease MARK me as brainlliest | |
| 42. |
What coefficient should be used to make the following equation balanced Na2+ O2 gives -No |
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Answer» Na + O2 = Na2O - Chemical Equation Balancer.Explanation:To balance a chemical equation, enter an equation of a chemical reaction and press the Balance button. The balanced equation will appear above.Use UPPERCASE for the first character in the element and lowercase for the second character. EXAMPLES: Fe, Au, Co, Br, C, O, N, F.Ionic charges are not yet supported and will be ignored.Replace immutable GROUPS in compounds to avoid ambiguity. For EXAMPLE, C6H5C2H5 + O2 = C6H5OH + CO2 + H2O will not be balanced, but XC2H5 + O2 = XOH + CO2 + H2O will.Compound states [like (s) (aq) or (g)] are not required.You can use parenthesis () or BRACKETS [].How To Balance EquationsRead our article on how to balance chemical equations or ask for help in our chat.You can also ask for help in our forums. |
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| 43. |
Which is not a basic metallurgical process? .Alloying.Concentration of ore.Extraction of metals.Refining |
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Answer» Alloying not a basic metallurgical process.hope it HELPS you...MARK it as BRAINLIEST... |
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| 44. |
Which of the following is least volatile option a water option B kerosene option C diethyl Ether |
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Answer» Explanation:(c) diethyle ETHER is more volatile than WATER and, (a)water is more volatile than (b)KEROSENE |
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| 45. |
Which of the following is homogeneous? A. Air B. Water C. Chalk in water D. Muddy water |
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Answer» a)airExplanation:an EXAMPLE of HOMOGENEOUS MIXTURE is AIR. |
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| 46. |
Minimum number of carbon atoms in neo alkane |
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Answer» ane. EXCEPT where OTHERWISE NOTED, data are given for MATERIALS in their standard state (at 25 °C [77 °F], 100 kPa). NEOPENTANE, also called 2,2-dimethylpropane, is a double-branched-chain alkane with five carbon atoms. |
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| 47. |
1. The C – C bond length in C60 is [ ] A) 1.54Å B) 1.42Å C) 1.4Å D) 1.20Å2. Which of the following is amorphous form of carbon [ ]A) Diamond B) Graphite C) C60 D) Coal3. The number of sigma and pi bonds in C2H2 molecule are [ ]A) 3, 2 B) 2, 3 C) 5, 1 D) 7, 04. The pair of elements which exhibits the property of catenation is [ ]A) Sodium and silicon B) Chlorine and carbonC) Carbon and sodium D) Silicon and carbon5. The hybridisation of each carbon atom in Graphite is [ ]A) sp B) sp2 C) sp2 D) sp3d6. The concept of hybridisation was introduced by [ ]A) Linus Pauling B) R.F. Curl C) H.W.Kroto D) R.E.Smalley |
| Answer» 1. 1.422. COAL3. 3,24. SILICON and carbon5. sp26. LINUS PAULING | |
| 48. |
In which of the following pair both species have compairable bond order. (1) O2[AsF6], BaO2[O-O bond order] (2) C2, CaC2[C-C bond order] (3) C2H2, CaC2[C-C bond order] (4) CaC2, N2–2[C-C and N-N bond order] |
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Answer» Bond order = 1/2×(N B −N AB )Order of filling MO is:1. N 2 :valence electrons=5+5=10(σ2s) 2 (σ∗2s) 2 (σ2p) 2 (π2p) 4 BO=1/2×(6−0)=3; 2. N 2− :valence electrons=5+5+1=11(σ2s) 2 (σ∗2s) 2 (σ2p) 2 (π2p) 4 (π ∗ 2p) 1 BO=1/2×(6−1)=2.5;3.O 2 :valence electrons=6+6=12(σ2s) 2 (σ∗2s) 2 (σ2p) 2 (π2p) 4 (π ∗ 2p) 2 BO=1/2×(6−2)=2;4. O 2− :valence electrons=6+6+1=13(σ2s) 2 (σ∗2s) 2 (σ2p) 2 (π2p) 4 (π ∗ 2p) 3 BO=1/2×(6−3)=1.5;Bond STRENGTH ∝bond orderbond strength/order: N 2 >N 2− and O 2 >O 2− Therefore, B is correct. |
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| 49. |
in an experiment 1.28 gram of copper oxide was obtained from 1.03 gram of copper. in another experiment 3.67 2 gram of copper oxide give on reduction,2.938 gram of copper . show that these figures verify the law of constant property.. |
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| 50. |
12.Gold is coated on a silver spoon using electricity .Name this process 1 point.Electroplating.Electricity.Galvanaisation |
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Answer» tion:Electroplating is a process that uses an electric current to reduce dissolved metal cations so that they form a thin coherent metal coating on an electrode. The term is also used for electrical oxidation of anions on to a SOLID substrate, as in the formation of silver chloride on silver wire to make silver/silver-chloride electrodes. Electroplating is primarily used to change the surface PROPERTIES of an object (such as abrasion and wear resistance, corrosion protection, lubricity, aesthetic qualities), but may also be used to build up thickness on UNDERSIZED PARTS or to form objects by electroforming. |
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