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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 vessel contains equal masses of Hydrogen and Helium. The fraction of the partial pressure of Hydrogen in the mixture is |
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Answer» Answer:2p/3 Explanation:LET total PRESSURE be p . given wt. of h2 =wt. of he. PARTIAL pressure of H is = total pressure * mole fraction of h |
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| 2. |
Find the no. of moles in 44g Co² |
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Answer» NUMBER of moles GIVEN weight /MOLECULAR weight. So, molecular weight of Carbon dioxide = 44 G. Thus, no of moles = 44/44 = 1 mole. MARK AS BRAINLISTIF IT HELP YOU....... :) ;) |
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| 3. |
commercially available concentration hcl contains 38/ by mass and density 1.19g mol-¹ calculate molarity of thia acid. |
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Answer» Answer: |
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| 4. |
1. State the relation between temperature andsolubility from the table given below:Substance 10°C 20°C 40°C 60°C 80°CdissolvedSodium 21g 32 g 62g 106 g 167 gchloride |
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Answer» Answer: SOLUBILITY of sodium chloride increases Explanation: asas TEMPERATURE increases the kinetic energy of the molecules get increase in the BOND BREAKS the solubility increases |
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| 5. |
Calculate number of moles of :1. 10g of H2So42.10g of Hcl3.10g of NaOH4.10g of HNO3 |
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Answer» Answer10/98 10/36.5 10/40 10/63 Explanation: |
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| 6. |
Switching on of television is which change physical or chemical |
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Answer» physical change Explanation: As you can even reverse the process the physical change can be defined as Physical changes occur when OBJECTS or SUBSTANCES undergo a change that does not change their CHEMICAL composition. This contrasts with the concept of chemical change in which the composition of a substance changes or one or more substances combine or break up to FORM new substances. |
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| 7. |
Pls solve these questions |
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Answer» You can’t ask these MUCH QUESTIONS at a TIME ok PLEASE ask your one QUESTION at a time pls |
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| 8. |
Chemistry 12th solid state |
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Answer» Answer: N3M8 Explanation: |
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| 9. |
Switching on of television is which change |
Answer» ELECTRONIC CHANGE .....not SURE.. |
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| 10. |
name the reaction when maO2 + 4 hcl= mncl 2 + 2 H2O + CL2,a) name the substance oxidised,b)name the oxidising agent,c)name the reducing agent and the substance reduced |
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Answer» a . HCL is oxidised into h2o b . mno2 is the oxidising agent c. hcl and mno2 is reduced |
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| 11. |
Chemistry class 12th solid state help plz |
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Answer» Answer: Number of atoms in close packaging = 0.5 mol 1 has 6.022 ×1023 PARTICLES So that Number of close−packed particles = 0.5 × 6.022 × 1023 = 3.011 × 1023 Number of tetrahedral VOIDS = 2 × number of atoms in close packaging Plug the values we get Number of tetrahedral voids = 2 × 3.011 × 1023 = 6.022 × 1023 Number of octahedral voids = number of atoms in close packaging So that Number of octahedral voids = 3.011 × 1023 Total number of voids = Tetrahedral void + octahedral void = 6.022 × 1023 + 3.011 × 1023 = 9.03 × 1023 Explanation: |
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| 12. |
0.2N HCL is mixed with 0.1N H2SO4 find pH of mixture? |
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Answer» As we not ! ʍօʟɛ= ċօռċɛռtʀatɨօռ ×ƲՕʟƱʍƐ SՕ, ʍՕʟƐ Օʄ ռaօɦ =50ʍʟ ×0.2 =100 ʍօʟɛ օʄ ɦċʟ =50ʍʟ ×0.4=200 10ʍօʟɛ օʄ ՌAՕɦ ɛxaċtʟʏ ռʊtʀɨʟɛsɛɖ ɮʏ 10 ʍօʟɛ օʄ ʍօʟɛ __ ɦĊʟ ռ004 +ɦċ1=ռaĊʟ +ɦ2օ Tɦat ɨs 20-10 = 10ɦċʟ ʍօʟɛ Ċօռ օʄ ɦ+=ռօ օʄ ʍօʟɛ օʄ ɦ+/ tօtaʟ Ʋօʟʊʍɛ օʄ sօʟʊtɨօռ (1050+50ʍ = 100ʍ/) =10/100=0.1 քɦ=10ɢ(ɦ+) ʟՕɢ (0.1)=1 SՕ ,Tɦɛ քɦ sօʟʊtɨօռ աɨʟʟ ɮɛ ɖօռɛ ! ⠀⠀⠀⠀⠀⠀⠀⠀⠀ Tɦaռҡs❤ |
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| 14. |
Write the symbol of any 15 elements. |
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| 15. |
Homogeneous and heterogeneous catalysis.differentiate |
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Answer» Homogeneous catalysts are those which exist in the same PHASE (gas or LIQUID ) as the REACTANTS, while heterogeneous catalysts are not in the same phase as the reactants. Explanation: |
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| 16. |
What happens when a copper vessel isExposed in maist air? |
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Answer» Answer: COPPER CARBONATE will be FORMED as copper REACTS with WATER vapour |
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| 17. |
What will be the currentdrawn by an electric bulb of40 W when it is connect toa source of 220v |
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Answer» Answer: Hey MATE !Here's your answer :Kindly REFER to the Attachment. Explanation:
Mark as Brainliest⚽⚽⚽ |
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| 18. |
Identify the type of chemical reaction C + H2O = CO + H2 |
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Answer» DISPLACEMENT REACTION is the answer of your Q |
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| 19. |
Covalent bond was proposed by? |
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Answer» ■ ✅✅Ruskin bond Please MARK it as BRAINLIST plzzzzzz♀️♀️ Hope it HELPS |
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| 20. |
The density of 10% by mass of Kcl solution is 1.06 g/cm3 calculate the molarity of solution? |
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Answer» Gg7ggugugug Explanation: Vg6gugugu |
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| 22. |
Identify the type of chemical reaction Co + 2H2=CH3OH |
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Answer» Answer: combination REACTION is your answer PLEASE MAKE me BRAINIEST |
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| 23. |
Two bond pairs of central atom bond angle is |
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Answer» Hyy Dude Atoms bonded to central ATOM Lone PAIRS Ideal bond angle (example's bond angle) 2 1 120° (119°) 4 0 109.5° 3 1 109.5 (107.8°) 2 2 109.5° (104.48°) May this helps you Plz marked in brainlest ANSWER |
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| 24. |
The density of gas at 27°C and 1 atm is “d” pressure remaining constant at the followingtemperature its density becomes 0.75 d [ ]1) 36°C 2) 127°C 3) 30°C 4) 54°C |
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| 25. |
Bond length is measured by? |
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Answer» Jawn,centimeter Explanation: |
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| 26. |
Answer the followingi. Some of the following statementsapply to DNA only, some to RNA only and some to both. Lable them accordingly.a. The polynucleotide is doublestranded. (...... )b. The polynucleotide contains uracil. (...... )c. The polynucleotide contains D-ribose (...... ).d. The polynucleotide contains Guanine ( ........ ). |
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Answer» a. The polynucleotide is double stranded.DNA b. The polynucleotide contains uracil. RNA c. The polynucleotide contains D-ribose DNA d. The polynucleotide contains GGuanine DNA RNA |
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| 27. |
Which form of water is highly compressible |
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Answer» Answer: the water is highly COMPRESSED in liquid FORM |
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| 28. |
In a neutral atom there are 12 electrons and its mass number is 24, then the number of neutrons is |
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Answer» Answer: 12 Explanation: mass number (A) =24 no. of NEUTRONS =A-z=12 |
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| 29. |
Deffine the term van't hoff facter. |
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Answer» the term van't Hoff factor MEANS the ratio between the actual CONCENTRATION of particles produced when the SUBSTANCE is dissolved and the concentration of substance as calculated from its mass |
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| 30. |
Two bond pairs on central atom, bond angle is ? |
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Answer» Answer:180 Explanation: |
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| 31. |
Please tell me answer from options |
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Answer» MARK as brainliest Explanation: |
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| 32. |
Cotton is solid but it floats on water why? Answer in 80 words. Correct answer will get brainiest |
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Answer»
Cotton has large NUMBER of pores, in which AIR is trapped. HENCE reducing its density and increasing the volume. Therefore cotton floats on water. But when these pores get FILLED with water it starts sinking. ORcotton has a porous structure, the air gets trapped between the pores making overall density of the cotton less then the water hence the cotton floats on the water. when the water replaces the air the pores, the density increases and the cotton sinks. HOPE THIS HELPS YOU MARK IT AS BRAINLIEST PLEASE |
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| 33. |
Molecular should be planer explain |
Answer» Hey mate hope it helps you..If the ATOMS ARRANGE themselves AROUND the central MOLECULE so that they exist on a single two-dimensional plane, the molecule is PLANAR |
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| 34. |
22.4 L of AQUEOUS H2O at STP contains how many moles? |
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Answer» HEY mate here is ur answer = Answer = 1mole At stp= moles=volume/22.4 volume GIVEN is 22.4. moles=22.4/22.4=1. hence it will contain 1 mole or 18 gm h2o. hope it HELPS. ☆☆☆☆ |
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| 36. |
What is the energy in joules, required to shift the electron of the hydrogen atomfrom the first Bohr orbit to the fifth Bohr orbit and what is the wavelength of thelight emitted when the electron returns to the ground state? The ground stateelectron energy is –2.18 × 10–11ergs.Calculate the wavenumber for the longest wavelength transition in the Balmerseries of atomic hydrogen.(i) An atomic orbital has n = 3. What are the possible values of l and ml?(ii) List the quantum numbers (mland l ) of electrons for 3d orbital.(iii) Which of the following orbitals are possible?1p, 2s, 2p and 3fUsing s, p, d notations, describe the orbital with the following quantum numbers.(a) n=1, l=0; (b) n = 3; l=1 (c) n = 4; l =2; (d) n=4; l=3.PLS ANSWER THESE QUESTIONS! |
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Answer» ASSIGNMENT jklzxcv ygyohguo |
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| 38. |
Thee chemical bond formed by sharing of valence shell electrons to attan octet (or) duplet isa) Ionic bondB) Covalent bondc)Hydrogen bonD) Dative bond |
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Answer» COVALENT bond Explanation: |
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| 39. |
An element L consists of molecules. when L is heated with iron metal, it forms a compound FeL. What chemical term would you use to describe the change undergone by L? |
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Answer» The CHEMICAL TERM WOULD be Oxidation. Hope I HELPED |
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| 40. |
RNA hasa. A - U base pairingb. P-S-P-S backbonec. double helixd. G - C base pairing |
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Answer» Answer: |
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| 41. |
Improper mixture ratio of coolant and water can causes |
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Answer» Coolant is the generic term for the cooling liquid in the cooling system. Coolant protects against frost, corrosion, OVERHEATING and lubricates. Its task is to ABSORB the engine heat and dissipate it via the cooler.
The coolant is a mixture of tap-water and anti-freezing compound (glycol/ethanol) mixed with various additives (bitter substance, silicate, antioxidant agents, foam inhibitors) and colored. Bitter SUBSTANCES are USED to prevent the coolant from being drunk inadvertently. SILICATES form a protective layer on the metal surfaces and prevent e.g. limescale deposits. Antioxidant agents prevent corrosion of components. Foam inhibitors suppress the foaming of the coolant. Glycol keeps hoses and seals smooth and raises the coolant’s boiling point. |
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| 42. |
Na in Na2so4 .10 h2o |
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Answer» HEY mate, pls....give the complete QUESTION... then i will be able to ANSWER COMPLETELY.... |
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| 43. |
42. Which of the following compounds will notundergo aldol condensation ?(A) Ethanal(B) Propanal(C) 2, 2, 2-Tricholoroethanal(D) 2,2-Dibromoethanal. |
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Answer» Answer: Option c Explanation: Aldol condensation occurs only in the COMPOUNDS having ALPHA hydrogen. SINCE in 2,2,2-Trichloroethanal there is no alpha hydrogen it can't UNDERGO Aldol condensation. |
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| 44. |
2 ml of KMnO4 solution is added to 100 ml of water. State four observation that you can make? |
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Answer» Potassium permanganate appears as a purplish colored crystalline SOLID. Noncombustible but accelerates the burning of combustible material. If the combustible material is finely divided the MIXTURE may be explosive. Contact with liquid combustible materials may result in spontaneous ignition. Contact with sulfuric acid may cause fire or explosion. Used to make other CHEMICALS and as a disinfectant. CAMEO Chemicals Permanganic acid (HMnO4), potassium salt. A highly oxidative, water-soluble compound with purple crystals, and a sweet taste. (From McGraw-Hill Dictionary of Scientific and Technical Information, 4th ed) hope this helps you please MARK my answer as brainlist and follow me |
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| 45. |
Among the following the element with old atomic number |
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Answer» Answer: |
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| 46. |
3. Draw a neat labelled diagram showing reaction of carbonates and metal hydrogencarbonates with acids? |
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Answer» Answer: neat labelled DIAGRAM SHOWING reaction of CARBONATES and metal hydrogen carbonates with ACIDS? |
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| 48. |
Isosters of the Carboxylic acid have been studied to---------Potency and ----------Polarity.[A] Increasing ,Enhancing[B] Enhancing , Reducing[C] Enhancing, Increasing[D]Increasing , Decreasing |
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Answer» Vjfalhfssytssrsarar |
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| 49. |
A disulfide link gives rise to thefollowing structure of protein.a. Primaryb. Secondaryc. Tertiaryd. Quaternary |
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Answer» a primary Explanation: W disulfied link GIVES RISE to the primary structure of protien. |
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| 50. |
HowcanyoudifferentiateZn (NO 3 ) 2 &Zncl2 |
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Answer» Reaction that differentiate Zn(NO3) 2 and ZnCl2: AgNO3 +ZnCl2 —› AgCl + Zn(NO3)2 If we BALANCE these reaction then; In reactant SIDE: Ag = 1 , NO3 =1, Zn =1 ,CL =2 and In product side: Ag =1, NO3=2, Zn=1 , Cl =2
Now we Balance these reaction; 2AgNO3 + ZnCl2 —› 2AgCl + Zn(NO3)2 .
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