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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 48851. |
when the electron of hdrogen atom returns to M shell from shells of higher energy , we get a series of lines in spectrum. This series is called |
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Answer» Answer:—Explanation:When the electrons of hydrogen atom return to L shell from shells of higher energy, we get a series of line in the SPECTRUM. This series is called. The observed WAVELEGNTH in the line spectrum of hydrogen atom were first expressed in terms of a series by Johann JAKOB Balmer, a Swiss TEACHER. 1λ=RH[122-1n2]n=3,4,5 . . . |
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| 48852. |
During laboratory preparation of oxygen manganese iv oxide is added to reagent H.what is reagent h? |
| Answer» N is the ANSWER HOPE it HELPS | |
| 48853. |
Define Filtration Criteriononly for mamuni12345 others reported |
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Answer» tion:Filtration is a SEPARATION TECHNIQUE used to separate a mixture of a solid and liquid using a filter PAPER of filtration funnel. A mixture of sand and water is separated by filtration. kattyahto8 and 1 more users found this ANSWER HELPFUL. |
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| 48854. |
Lab 8 First Question Help Please |
| Answer» HTTPS://www.coursehero.com/file/44244470/Heats-of-Reaction-Labpdf/it will HELP U | |
| 48855. |
6. How many molecules of Co, are present in 1.12 L of it at STP? |
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Answer» tion:Correct option isB3.01×10 12 given VOLUME of gas =1.12×10 −7 CC6.023×10 23 MOLECULES of any gas OCCUPIED 22400ml at STPSo,1.12×10 −7 CC volume occupied by =6.023×10 23 × 224001.12×10 −7 {1CC=1ml}=3.01×10 12 molecules of gas |
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| 48856. |
I need the answer for C |
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Answer» "The heat of REACTION for the process described in (a) can be determined by applying Hess's law. The heats of reaction shown in the table below can be. obtained experimentally or LOOKED up in tables of ENTHALPY data."Explanation:HOPE it's HELPFUL :) |
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| 48857. |
Mcq science netals and non metalsCopper the mass of cathode |
| Answer» THODE is GREATERTHAN ANODE MASS | |
| 48858. |
In which process the yarns are made from these thin strands |
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Answer» SpinningExplanation:Yarns are made up of thin strands called FIBERS. The process of MAKING yarn from fibers is called SPINNING. In this process, a mass of COTTON WOOL are drawn out and twisted. This brings the fibers together to form yarn. |
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| 48859. |
Husk particles are heavier than grains true or false |
| Answer» HOPE it HELPS you MATE MARK as BRAINLIEST | |
| 48860. |
What is crystallization? |
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Answer» Crystallization or crystallisation is the process by which a SOLID forms, where the atoms or molecules are highly ORGANIZED into a STRUCTURE known as a crystal. Some of the ways by which crystals FORM are precipitating from a solution, freezing, or more rarely DEPOSITION directly from a gas. |
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| 48861. |
The last elctron of has of sodium quantum no a) 3,0,0,1/2 b) 2,0,0,-1/2 c) 2,0,1,1/2 d) 3,0,0,1/2 |
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| 48862. |
What are hybridisation states of each carbon atom is the following compounds? (a) C6H6. (b) HCONHCH |
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Answer» Photosynthesis is the process by which PLANTS PREPARE food with the help of sunlight WATER air and chlorophyll |
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| 48863. |
The last elctron of has Be quantum no a) 2,0,0,1/2 b) 2,0,0,-1/2 c) 2,0,1,1/2 d) 2,0,0,1/2 |
| Answer» B) 2,0,0,-1/2Explanation:USE all QUANTUM NUMBERS | |
| 48864. |
Explain the atom economy with suitable example |
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Answer» Atom ECONOMY is a measure of the NUMBER of ATOMS from the starting materials that are present in the useful PRODUCTS at the end of the chemical process.Explanation:please mark me as the BRAINLIEST |
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| 48865. |
What is the heat of reaction for the process described in (a) |
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Answer» The HEAT of reaction for the PROCESS described in (a) can be determined by applying Hess's LAW. The heats of reaction shown in the table below can be. obtained EXPERIMENTALLY or looked up in tables of enthalpy data. |
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| 48866. |
What is POAC and how to apply that ? please no goógled contents ! |
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Answer» the abbreviation USED for PRINCIPLE of Atom CONSERVATION. HOPE it's helpful for you mark brainlest ❤️ |
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| 48867. |
Relationship between the volume and the number of molecular mass was expalained by? |
| Answer» 23 is ANSWER Explanation:so please MARK me BRAINLIEST please | |
| 48868. |
PROBLEM 39. 0.105 g of a volatile liquid on treatment in a Victor Meyer's apparatus displaced 40.50 mL of air collected over water at 15°C and 746 mm pressure. Calculate the molecular weight of the substance (Aqueous tension at 15°C = 13.7 mm). |
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Answer» nch of SCIENCE concerned with the substances of which matter is composed, the investigation of their PROPERTIES and reactions, and the USE of such reactions to FORM new substances. |
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| 48869. |
The highest energy subshell of h-atom is |
| Answer» H has 2s− ORBITAL which is not ACCESSED by any e− so is of MAXIMUM energy.HOPE IT'S HELPFUL TO YOU TOO | |
| 48870. |
Which one of the following substances has hydrogen bonding as well as Van-dear Waal's forces? (A) F2 (B) Brz (C) Cl2 (D) CH2NH2 |
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| 48871. |
Define physical prperty of matter |
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Answer» Physical properties of matter are properties that can be measured or observed WITHOUT matter changing to an entirely different substance. ... Examples of physical properties of matter include melting point, color, HARDNESS, state of matter, ODOR, and boiling point. |
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| 48872. |
What is p^H ? Write down the formula of p^H. |
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Answer» pH = -log[H+]where log is the base-10 logarithm and [H+] stands for the hydrogen ion concentration in units of moles per liter SOLUTION. The term "pH" comes from the German word "potenz," which means "power," COMBINED with H, the element symbol for hydrogen, so pH is an abbreviation for "power of hydrogen."To calculate the pH of an aqueous solution you NEED to know the concentration of the hydronium ion in moles per liter (molarity). The pH is then calculated using the expression: pH = - log [H3O+]Explanation:hope it helps ;)) mark as brainliest! |
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| 48873. |
Identyfy the element which is used to calculate the age of fossils &prehistoric objects |
| Answer» RADIOCARBON EXPLANATION:CARBON ISOTOPE C¹⁴ | |
| 48874. |
Weight of the element is equal to its _______ expressed in a.m.u |
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Answer» ◆◇...The weight of the ELEMENT is EQUAL to its Atomic MASS expressed in a.m.u.◆◇...Explanation: |
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| 48875. |
In t butyl alcohol tertiary carnon is bonded to how many hydrogen atoms |
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Answer» ogen atom Explanation:tert-butyl ALCOHOL is also called 2-methylpropan-2-ol in IUPAC system. Here the TERTIARY CARBON is bonded to three methyl groups and one OH group. And no hydrogen atom is bonded to the tertiary Carbon. |
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| 48876. |
The plastic which can not be recycled is |
| Answer» HOWEVER, THERMOSET PLASTICS “contain polymers that cross-link to form an irreversible chemical bond,” meaning that no matter how much heat you apply, they cannot be remelted into new MATERIAL and hence, non-recyclable. | |
| 48877. |
H2 is four faster than O2 |
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Answer» answer as followsExplanation:HYDROGEN (H2) gas diffuses 4 times faster than oxygen (O2) gas. Explanation: ACCORDING to Graham's law of diffusion, the rate of diffusion or movement of gas is inversely proportional to the square root of it's MOLECULAR WEIGHT. ... So hydrogen diffuses faster whereas oxygen takes long time to DIFFUSE. |
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| 48878. |
What will be the mass of an atom having only one proton and one neutron? Ans:no |
| Answer» PROTONS and neutrons have approximately the same mass, about 1.67 × 10-24 grams, which scientists DEFINE as one ATOMIC mass UNIT (AMU) or one Dalton.Explanation:no | |
| 48879. |
Shyam shavet photography me kya pryukt hota hai 1 Agcl 2 feso4 3 pb(No3)2 4 Caco3 |
| Answer» LANATION:HOPE this will HELP you DEAR | |
| 48880. |
1. Show the calculation of the final temperature of the mixture when a 40.5 gram sample of water at 85.7°C is added to a 36.8 gram sample of water at 26.3°C in a coffee cup calorimeter. c(water) = 4.184 J/g °C |
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Answer» you can SEE the ATTACHED FILE for thei'dont KNOW IDONT know idont know idont know idont |
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| 48881. |
Name the sources of nitrogen and hydrogen in making ammonia |
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Answer» The haber process combines NITROGEN from the AIR with hydrogen derived mainly from natural GAS (methane) into ammonia. The reaction is reversible and the PRODUCTION of ammonia is exothermic. |
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| 48882. |
Why interhalogen compounds are formed?? |
| Answer» INTERHALOGEN COMPOUNDS are compounds formed when halogen group ELEMENTS REACT with each other. In other words, it is a molecule which consists of two or more DIFFERENT elements of group 17.Explanation:please Mark me as a brainliest | |
| 48883. |
an aqueous solution of NaOH is electrolysed using Hg cathode and platinum anode. what are the product obtained at cathod and anode respectively |
| Answer» OPTION A is your ANSWER EXPLANATION:#SAGARTHELEGEND | |
| 48884. |
How convert 2 butyne into Cis and trans 2 butene |
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Answer» When 2-butyne is REDUCED selectively to cis-2-butene, a carbon-carbon triple BOND is reduced to cis carbon-carbon double bond. USUALLY, complete reduction of alkynes gives alkanes. In these reduction reactions, the carbon-carbon triple bond is reduced to the carbon-carbon SINGLE bond. |
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| 48885. |
Co2 is an oxidising agent. Justify |
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Answer» Mg atoms in Mg(s) are OXIDIZED, H atoms in H2O are reduced, H2O is the OXIDIZING AGENT, and Mg is the reducing agent. Co in Co(s) is oxidized, and Co(s) is the reducing agent.Explanation:mark me as brain list |
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| 48886. |
Heating a wire is it a chemial or a physical change |
| Answer» PHYSICAL change.Explanation:It is a physical change as long as there is no other SUBSTANCE that COULD react with the METAL while it is being heated. | |
| 48887. |
In hydrogen iodide the bond is ??polar nor non polar covalent bond |
| Answer» POLAR CovalentExplanation: | |
| 48889. |
1. The famous alien jadu on his visit to our planet earth brought a sample containing 100 identical H - like atoms (hypothetical atoms, 2 can be fractional) from his planet. He gave these atoms to Rohit (Hritik Roshan) asking him to analyze them. He further gave Rohit the following information's: 1. Out of the given atoms, some are in ground state and some others are in a higher energy level (n = x) and the potential energy of electron in the ground state of given atom is - 192 eV. 2. When the sample is exposed to radiations of wavelength 155 nm, the electrons jump to another higher energy level (n = x + 3). Upon back - transition upto ground state, a total of 10 different spectral lines are produced. Then, jadu asked Rohit two questions: (a) "What is the final state in which the electrons move after absorbing photons of wavelength 155 nm ?" |
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Answer» rhfjffjfjjftfofifir |
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| 48890. |
Which of the following is a physical change? Burning of magnesium ribbon Rusting of iron Glowing of bulb Rotting of fruits |
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| 48891. |
Defination of formation of presipitate |
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Answer» A precipitation REACTION refers to the formation of an insoluble salt when two solutions containing soluble salts are combined. The insoluble salt that falls out of SOLUTION is known as the precipitate, hence the reaction's name. Precipitation reactions can help determine the presence of various IONS in solution.Explanation:please MARK me as brainliest |
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| 48892. |
Kisi paudhe Ki Phool yah Bina Phool wali Kahani Mein Jal Ke Parivahan conjunction karna |
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Answer» what?EXPLANATION: |
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| 48893. |
Calculate the moles of hydrogen required to completely hydrogenate 130 g of ethene |
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Answer» , an INTERESTING thing takes places when you are dealing with gases that are under the same conditions for pressure and temperature. in such cases the mole ratio becomes the volume ratio. the idea is that since you are dealing with two ideal gases. you can use the ideal gas law equation to write P.V 1 =n 1 .RT (for ETHYNE) P.V 2 =n 2 .RT (for hydrogen) The pressure and the temperature are the same for both gases. since the reaction presumably takes place ta STP. if you divide these two equal IONS, you will get. P.V 2 P.V 1 = n 2 RT n 1 .RT this is equivalent to n 2 n 1 = V 2 V 1 the mole ratio is equivalent to the volume ratio. All you need now is the balanced chemical equation for the reaction which looks like this C 2 H 2 (g)+2H 2 (g)→C 2 H 6 (g) Notice, that you have 1:2 mole ratio between ethyne and hydrogen gas. this means that the reaction needs twice as MANY moles of hydrogen gas than of ethyne 0.25dm 3 ethyne= 1dm 3 ethyne 2dm 3 hydrogen 0.50dm 3 hydrogen. |
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| 48894. |
While studying the double displacement reaction, the solutions of Barium Chloride & Sodium Sulphate are Mixed together. a. What do you observe as soon as the two solutions are mixed together? b. What will happen in the above observation made by you after 10 min? |
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Answer» BaCl2 + NA2SO4 _ BaSO4 + 2NaCla . A YELLOWISH ODOURLESS powder is OBSERVED along with a saltb. I DON'T KNOW |
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| 48895. |
আনব ভর বলতে কি বোঝায়? |
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Answer» it's call the dengerous enjaitee of human , I don't KNOW I THINK it PLEASE follow |
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| 48896. |
Trichloroacetic acid on heating with dil. alkali solution forms: (a) Trichloroacetone(b) Trichloromethane(C) Trichloroacetate(d) No reaction |
| Answer» TION:trichloroacetate is the ANSWER of the questionOption C | |
| 48897. |
State the law of Reciprocal Proportion and illustrate it with examples |
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Answer» o DIFFERENT elements SEPARATELY COMBINE with a fixed mass of a third ELEMENT, the proportion in which they combine with one another shall be either in the same ratio or some multiple of it.” For example, For example, sulphur and CARBON both form compounds with hydrogen. |
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| 48898. |
What is atomic mass if an atom |
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Answer» is tndnvnsncn N KDK EXPLANATION:wjdnvmsmfmn |
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| 48899. |
Cell diagram for a chemical cell is a follower |
| Answer» CELL DIAGRAM for a CHEMICAL cell is a followerExplanation: | |
| 48900. |
An a-particle has initial kinetic energy of 25 eV and it is accelerated through the potential difference of 150 volt. If a proton has initial kinetic energy of 25 eV and it is accelerated through the potential difference of 25 volt then find the approximate ratio of the final wavelengths associated with the proton and the a-particle? |
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Answer» For α -PARTICLE, total kinetic energy =25+2×150=25+300=325eVFor PROTON, total kinetic energy =25+1×25=50eVλ p λ α = m α K.E α m p K.E p = 4×3251×50 = 130050 =1:26Hence, the APPROXIMATE RATIO of the FINAL wavelengths associated with the proton and the α particle is 26 :1. |
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