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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. |
Xeo3f2 properties structure |
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Answer» The hybridization of XEO3F2 is sp3d it has 5 substitutes. 2-Its structure is trigonal bipyramidal in which the oxygen atoms are situated on the plane and the fluorine atoms are on the top and BOTTOM, for this REGULAR distribution is a non-polar MOLECULE |
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| 2. |
Substance that is filled with numerous beads to condense vapours |
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Answer» ce that is filled with numerous beads to CONDENSE vapors is a Condenser.This apparatus is USED in various EXPERIMENTS where a GASEOUS substance is condensed to its liquid state.For condensing the vapors chilled water is used and then when those vapors COMES in contact with the chilled water ,the temperature falls instantly. |
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| 3. |
Can a substance be in a pure form of matter? Justifythis statement with an example |
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Answer» yes a substance canExplanation:example is deionized WATER is pure FORM of a matter which is FOUND in LIQUID state |
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| 4. |
Cuper atomic weight |
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Answer» 63.546 uExplanation:The AVERAGE atomic mass of copper is 63.546 AMU. Copper has twonaturally OCCURRING isotopes. Cu-63 has an atomic mass of 62.9296 amu, and an ABUNDANCE of 69.15%.HOPE it helps! |
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| 5. |
Please answer 8 b I will mark brainliest |
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Answer» During RAINY season , common salt (NaCl) absorbs moisture from air . This impurity can be EASILY removed from TWO METHODS:The salt can be kept in SUNLIGHT for few hours.It can be heated in a pan.Hope it helps... |
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| 6. |
Derive an expression for Beer-lambert law |
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Answer» It is often attributed to JOHANN Heinrich Lambert, who cited Bouguer's ESSAI d'optique sur LA gradation de la lumière (Claude Jombert, Paris, 1729)—and even quoted from it—in his Photometria in 1760. Lambert's law stated that absorbance of a material sample is directly proportional to its thickness (PATH LENGTH). |
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| 7. |
Find percentage concentration of kcl in solution where 15 gm of kcl is dissolved in 200 gm of water |
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Answer» tion:13 % of KCL is CONCENTRATED in the solution where 15 grams of KCL is dissolved in 200 grams of water you had done a MISTAKE water is measured in LITRES millilitres kilo litres |
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| 8. |
4. Give reason : (a) Freezing of water to ice and evaporationof water are physical changes.(b) Burning of a candle is both a physical anda chemical change.(c) Burning of paper is a chemical change.(d) Cutting of a cloth piece is a physicalchange, though it cannot be reversed. |
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Answer» a) water is in liquid form and ICE is solid so change of state occurs THEREFORE is a physical change. b) burning of candle melts it and chemical properties inside it also changes due to heat so it's a chemical as well as physical change. c) Burning of paper PRODUCES ash and the chemical properties of paer can be identified by the production of ash so it's a chemical change. d) As we know cutting means dividing so in case of CLOTHES it is stretched into pieces, so it's a physical change though the microscopic changes are not observed. Explanation:please mark this as brainliest |
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| 9. |
Definition of least count |
| Answer» E here is your answer.The smallest value that can be measured by the measuring INSTRUMENT is CALLED its least count. Measured VALUES are good only up to this value. The least count error is the error associated with the resolution of the instrument.thank you.plzzzzzzzzzz MARK my answer as brainliest.plzzzzzzzzzz follow me. | |
| 10. |
How acid rain effects the soil in points |
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Answer» Acid rain can effect the SOIL because acid rain CONTAINS more harmful and ACIDIC chemicals and which results in more aluminum ABSORPTION from soil. |
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| 11. |
The process which is used to separate tea leaves form tea liquor. |
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Answer» filtrating is the process by which tea LEAVES are separated from tea liquorI hope this is RIGHTIF yes then SEND a thanks and if you want then follow meHAVE A NICE DAY!!! |
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| 12. |
How many grams of Zn of 90% purity would be needed to reduce 8.5 gram of nano3 in presence of alkali? |
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Answer» tion:5 grams of zinc purity would be NEEDED to reduce 8.5 gram of SODIUM NITRATE in PRESENCE of alkali |
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| 13. |
H ion ka volume stp per when electic xharge ki constant value 4.5gm aln |
| Answer» TION:WRITE the FORMULAS CORRECTLY | |
| 15. |
Important question for periodic test 1 in chemistry |
| Answer» IMPORTANT QUESTION can be from LATENT HEAT TOPIC. | |
| 16. |
Name and formula of a compound which contain 10 molecules of water |
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Answer» the FORMULA for rust has 10 molecules of WATER Fe₂O₃ . 10 H₂O.....PLEASE MARK ME AS THE BRAINLIEST ONE.THANK YOU. |
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| 17. |
Give the conduction of an atom |
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Answer» On a microscopic scale, conduction occurs as rapidly moving or vibrating ATOMS and molecules interact with neighboring PARTICLES, transferring some of their KINETIC ENERGY. Heat is transferred by conduction when adjacent atoms vibrate against one ANOTHER, or as electrons move from one atom to another. |
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| 18. |
(b) A change which alters the composition of a substance is known as achange.(c) There is no change in the ................ of thesubstance during a physical change.(d) The reaction in which energy is evolved iscalled .............. |
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| 19. |
3.Fill in the blanks :(a) The process of a liquid changing into asolid is called .... |
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Answer» a) The process of a liquid changing into asolid is For EXAMPLE, a solid may become a liquid. This PHASE CHANGE is called melting. When a solid CHANGES into a gas, it is called SUBLIMATION. When a gas changes into a liquid, it is called condensation. When a liquid changes into a solid, it is called solidification. |
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| 20. |
How to make a model of soil profile in bottle |
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Answer» tion:CUT the TOP off the large, clear PLASTIC bottle, as shown. Place the smaller bottle inside the LARGER one. Make sure the gap is evenly spaced all the way around the smaller bottle. Fill the gap with layers of SOIL and sand to the top.Hope it will help u... |
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| 22. |
Name the monomers of the above polyester |
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Answer» The following are the composing monomers of polyester:Explanation:Ethane-1/2-diol and benzene-1/4-dicarboxylic ACID which is, according to some sources, ALSO CALLED terephthalic acid. THANKS. |
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| 24. |
In the following compounds, glycosidic linkage occurs between which monosaccharide molecules and at which position: (i) Sucrose (ii) Maltose (iii) Lactose (iv) Amylose (v) Amylopectin (vi) Cellulose |
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Answer» answer is very simple Explanation:1-in sucrose aplha 1-2 glycosidic linkage 2 in maltose alpha 1-4 G. L3-in LACTOSE beta 1-4 G. L4 - AMYLOSE have no BRANCHING so it only has aplha 1-4 G. L5-amylopectin have BRANCH STRUCTURE so it has APLHA1-4G. L in chaining part and aplha 1-6 G. L at unbranch side. 6-cellulose has only beta 1-4 G. L |
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| 25. |
By which linkage are two nucleotides joined to each other? Give answer in brief. |
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Answer» d CALLED as PHOSPHODIESTER bond links or joins two NUCLEOTIDES of DNA with each other.The 3' carbon of the 1st nucleotide is JOINED to the 5' atom of carbon of the 2nd nucleotide by this linkage.So, the bond between them is called the phosphodiester bond. It is a kind of covalent bond.Adenine, thymine, guanine and CYTOSINE are the 4 nucleotides of DNA. |
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| 26. |
How can we seperate a true solution |
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Answer» we can SEPARATE a true SOLUTION by the process of either evaporation or DISTILLATION. HOPE this would help plz mark as the BRAINLIEST ✌✌✌ |
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| 27. |
What is the atomic number of Li2+ |
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Answer» 3Explanation:LI2+ is a LITHIUM ATOM (Z=3) with only ONE ELECTRON. |
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| 28. |
Why do,non-metal have low densuties? |
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Answer» Because BONDING between their molecules are GENERALLY weak london or dispersion forces DUE to which they are less forces of attraction .HOPE this will HELP uh |
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| 29. |
General formula of alkenes and alkyl radicals are respectively |
| Answer» HEY MATE ,ALKENES :- CnH2nAlkyl :- CnH2n+1Hope this will HELP UH | |
| 30. |
How can be the atomic number 30? |
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Answer» .................... |
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| 31. |
There are the elements: A(2.4),B(2.8.1),C(2.8.6) Write down the most likely formula of this compound using the symbols of the two elements give above.(Write the more electropositive first) |
| Answer» TION:..........i LOVE U....... | |
| 32. |
Name one indicator which specifies the various levels of H+ ion concentration |
| Answer» PH paperHOPE THIS HELPS YOU | |
| 33. |
How are the quantum numbers n,land m arrived it? Explain the significance of these quantum numbers |
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Answer» Principle quantam number is denoting by n. Its significance is:increase of orbit. Azimutal(or) ANGULAR MOMENTUM quantum number is l. Significance :it give shape of orbit . magnetic quantum number is m. SIGNIFICANT is:orientation of orbit in it's own axis. Spin quantum number is s. Significant :it give spin of electron |
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| 34. |
Which of represents the condensed structure formula of neohexane |
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Answer» Which of the following represents the CONDENSED structural FORMULA of neohexane? (a) (CH₃)₂CH(CH₂)₂CH₃ (b) (CH₂)₃CCH(CH₃)₂ (c) (CH₃)₂CHCH(CH₃)₂ (d) (CH₃)₃CCH₂CH₃ |
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| 35. |
Which property do you think of while suggesting the remedy from a problem of acidity |
| Answer» MILK of megnisiaExplanation:OME prazole. Pentaprozole | |
| 36. |
Write two names of separation techniques for amino acid mixture.Give answer in brief. |
| Answer» SHELL it RIGHT I THINK so cetrifugation and SUBLIMATION EXPLANATION: | |
| 37. |
Which enzymes hydrolyse sucrose and maltose?Give answer in brief. |
| Answer» MALTOSE is converted into Glucose with the presence of ENZYME CALLED Maltase.And ,Sucrose is converted into glucose and fructose in presence of enzyme called Sucrase.Hope this will help UH | |
| 38. |
Calculate the wavelength of the radiation emitted when an electron in a hydrogen atom makes a transition from an energy level with n=4 to n=1 |
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Answer» Explanation:According to BALMER formulaWave no = RH [1/n1^2 – 1/N2^2]Here n1 = 1 , n2 = 4, RH = 109678Putting these values in the equation we getWave number =109678(1/1^2 - 1/4^2) = 109678 x 15/16Also λ = 1/ wave numberTherefore λ = 16 / 109678 x 15 = 102823.125 nm |
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| 39. |
Which compound of calcium is used for making cement and glass |
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Answer» tion:HEY BUDDY your Answer is CALCIUM carbonate is used for making cement and glass.Follow |
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| 40. |
Which non metal constitude the matter of celestial bodies |
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Answer» me, the ANSWER ISHYDROGEN |
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| 41. |
Date :all In nehich oftheJollowing8 NaCl csbild), ice and wan. |
| Answer» GETTING your QUESTION PLZ RECHECK it | |
| 42. |
Which non metals constitutes the matter of celestial bodies |
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Answer» istry, a nonmetal (or non-metal) is a CHEMICAL ELEMENT that mostly lacks ... are METALS than nonmetals, two of the nonmetals —hydrogen and helium—make up over 99 percent .. |
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| 43. |
Which ion has the largest radius se2- f o2- rb |
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Answer» The answer is "Rubidium Rb+".Explanation:While moving from left to right in periodic table the NUCLEAR attraction between nucleus and electrons INCREASES and the size decreases. While moving down the group as the NUMBER of shells increases the radius increases. Rb+ belongs to FIRST group and fall in 5th period. O-2 and F- are placed in the second period of the periodic table. Se-2 belongs to 4th period and 16th group of the periodic table. Following is the order of increase of radius of ions. F- < O-2 < Se-2 < Re+ |
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| 44. |
Short method to form benzyl alcohol to 2 phenylethanoic acid |
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Answer» shadygifhlhafksykdthrsjtsgkgjdtjstjditgidkgddtjstusy |
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| 45. |
Which of the following statements is true? Select the proper choice from the given choices. (A) Enzymes are carbohydrates (B) Enzymes are not obtained at the end of reaction (C) Enzymes are obtained in the changed form at the end of reaction (D) Enzymes are obtained in the original form at the end of reaction |
| Answer» HEY MATE ,Your ANSWER will be (B)EXPLANATION: | |
| 46. |
Explain chemical reaction of benzene diazonium chloride.Answer the question in detail. |
| Answer» PRIMERO AROMATIC amines REACT with the mixture of NaNo2+Hcl to form BENZENE DIO zonium chloride | |
| 47. |
Write a note on the industrial production of amine.Answer the question in detail. |
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Answer» painting with oil pastel night out on world peace in which there is HUSKS SHAH to draw a TRADITIONAL wedding gift list of the poetry winter song by 7phrases with sentences and not 7September |
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| 48. |
Explain preparation of benzene diazonium chloride. |
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Answer» The preparation of benzene DIAZONIUM chloride is given below:-⇒Take Aniline and react it with NaNO₂ with HCl in the PRESENCE of 273K-278K temperature then it will form benzene diazonium salt.→This reaction is also KNOWN as Benzene DIAZOTIATION Reaction.←..* The structure in this image is made USING Paint* |
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| 49. |
Which of the followinbg ionic species has largest size and why1) Rb+ (aq)2) Li+ (g)3) Na+ (aq)4) Li+(aq) |
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Answer» Li+in WATER a lithium.ion has more capability to attract more water MOLECULES to itself so it's SIZE BECOMES larger..!!hope it helpedplz mark brainliest!!! |
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| 50. |
Classify the following as a physical or a chemical change: a. drying of wet clothesb. manufacture of salt from sea water c. butter getting rancid d. boiling of water e .burning of paper f. melting of wax g. burning of paper h. formation of clouds I. making of a sugar solution j. glowing of an electric bulb k. curdling of milk |
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Answer» A. PHYSICAL CHANGEB. physical changeC. CHEMICAL changeD. physical changee. chemical changeF. chemical changeG. chemical changeH. physical changeI. chemical changeJ. physical changeK. chemical change✌HOPE ANSWER IS USEFUL... ❤ |
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