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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. |
How to change 465 grams into 100% |
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Answer» i wil TEL u Explanation: 465/10 MULTIPLIED by 100 465 multiplied by 10 gives u 4650 so it COMES 465% in 1/10 of it please note down this points it MAY help u out mark brainliest |
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| 2. |
In exothermic reaction , does the evolved or released energy always have to be heat ? Explain your answer and provide an example |
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Answer» Answer: in an EXOTHERMIC REACTION the energy evolved is USUALLY in the form of heat or light Explanation: pls mark me brainliest if it helped you |
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| 3. |
Find number of electron in 4.25 gram of NH3 |
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Answer» ATOMIC WEIGHT of NH3=14+3=17gms so, 4.25gms=10 × 4.25/17 =42.5/17 = 2.5 so, no. of electrons=2.... |
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| 4. |
Given that 21kg of magnesium carbonate is heated calculate the mass of magnesium oxide formed and show calculations |
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Answer» MARK me as a BRAINLIEST |
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| 5. |
Among the following salts which is an acetic acid a)CH3COONH4 b)CH3COONA c)HCOONA d)NH4Cl |
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Answer» Answer: GOT it Explanation: HCOONA is a chemical acid ch3coonh4 belongs to other so ch3coona is answer |
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| 6. |
किसी द्रव के कब नाक पर वायु के दाम का क्या प्रभाव पड़ता है |
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Answer» Answer: Fact-Pure liquid OXYGEN can be DEADLY and mixed Oxygen is essential for LIFE |
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| 7. |
Among the following salts which is an acetic acid |
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| 8. |
What are the uses of calcium oxide |
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Answer» Explanation: CALCIUM oxide is WIDELY USED in industry, e.g., in making porcelain and glass; in purifying sugar; in preparing bleaching powder , calcium CARBIDE, and calcium CYANAMIDE; in water softeners; and in mortars and cements. In agriculture it is used for treating acidic soils |
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| 9. |
The radius ratio of first orbit of he and second of h is? |
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Answer» ..........................................:) |
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| 10. |
Q1. Show that K= (tr-tm)/ tmWhere K' = capacity factor, tr= retention time of target peak solute that is retained by thecolumn packing and tm= dead time of the column or un retained peak time. |
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Answer» Answer: Explanation: Factors that influence the RT value of the components of a mixture? Boiling temperature and POLARITY of the compound. ... The polarity of the component compounds realtive to the polarity of the STATIONARY phase in the column. ... Column temperature. ... Flow RATE of the carrier gas. ... Column length. ... AMOUNT of material injected. |
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| 11. |
Why methyl orange is used as an organic pollutants |
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Answer» Among environmental pollutants, azo-dyes including methyl orange (MO) make up a SIGNIFICANT component of organic pollutants in general. ... It is GENERALLY believed that the degradation of POLLUTANT dyes is mainly based on the production of the hydroxyl radicals (HO˙).Explanation: Hope this ANSWER is helpful to u and give me thanks and take thanks please follow me I will also follow back u |
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| 12. |
Find outmolar mass of x when loog ofXis dissolved in soomL of solution itmolarity ofsolution is0.5 |
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| 13. |
Difference between one gram of iron and one atom of silver |
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Answer» Answer: Explanation: one gram atom of silver = gram atomic weight of silver = 107.8 g (atomic MASS of silver = 107.8 u) . |
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| 14. |
Why reactions of molecular hydrogen are slow? |
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Answer» Answer: Well, ORDINARY HYDROGEN have the strong COVALENT bonds in it Which is difficult to break so they are well stable. Hence the reaction of these MOLECULAR hydrogen will be slow normally. ... ALSO , with the different substance hydrogen reacts differently. So, the reaction rate also depends on the reacting substances. |
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| 16. |
Average atomic masses of all the elements in amu(u). |
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Answer» ---------------- I HOPE so it will HELP you ----------------- |
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| 17. |
What do you mean by selection rule in spectroscopy ? |
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Answer» Answer: the surface SELECTION RULE is applied to identify the peaks OBSERVED in VIBRATIONAL spectra. |
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| 18. |
Answer my questions pls..!warning ⚠️spammers stay away..! |
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Answer» |
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| 19. |
Describe an activity to illustrate tha particles of matter are continuasly moving |
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Answer» There are several examples that show particles of matter are constantly moving: - The SMELL of FOOD being cooked in the kitchen reaches us even from a considerable distance. - The smell of perfume SPREADS due to the diffusion of perfume vapours into the air. |
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| 20. |
Answer my question pls.!lazy to search in Google..!warning..⚠️spammers stay away..! |
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Answer» Ans - Tyndall effect also called Tyndall phenomenon, scattering of a BEAM of LIGHT by a medium containing small SUSPENDED particles. e.g. smoke or dust in a room . Heterogeneous mixtures which are suspension and colloidas show Tyndall effect. Ans - A sol is a type of colloidal in which solids is the dispersed phase and liquid is the dispersion medium. e.g, milk of magnesia , mud etc A gel is a type of colloidal in liquid is the dispersed phase and solid is the dispersed medium. |
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| 21. |
(a) diffusion.(6) Brownian motion.Name the scientist who studied the movement of pollen grains suspended in water through a microscope.What is this phenomenon known as ? |
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Answer» Answer: Diffusion- Diffusion is the movement of a substance from an area of high concentration to an area of low concentration... Brownian Motion- The random movement of MICROSCOPIC particles suspended in a liquid or gas, caused by collisions between these particles and the molecules of the liquid or gas..... And The scientist NAMED “Robert Brown” proposed a phenomenon named “Brownian motion or Brownian movement” which explains the pollen grains’ movement when it is suspended in water particles caused by the bombardment with the SURROUNDING medium. He was the one who FIRST observed the irregular motion of the particles through the MICROSCOPE in the year 1827. This invention creates a huge impact on the “kinetic theory of molecules”.... Hope it helps u... |
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| 22. |
Henry's law constant for solubi3if methane in benzene is 4.27×10^5 mm hg at constant temperature. Calculate solubility of methane at 760 mm hg pressure at same temperature |
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Answer» Answer: 1.78 * 10 ^-3 Explanation: ANSWER In chemistry, Henry's law is a gas law that STATES that the amount of dissolved gas is proportional to its partial pressure in the gas phase. The proportionality factor is called the Henry's law constant. An everyday example of Henry’s law is given by carbonated soft drinks. Before the bottle or can is opened, the gas above the drink is almost pure carbon dioxide at a pressure slightly higher than atmospheric pressure. The drink itself contains dissolved carbon dioxide. When the bottle or can is opened, some of this gas escapes, giving the characteristic hiss (or pop in the case of a sparkling wine bottle). Because the pressure above the LIQUID is now lower, some of the dissolved carbon dioxide comes out of solution as BUBBLES. If a glass of the drink is left in the open, the concentration of carbon dioxide in solution will come into equilibrium with the carbon dioxide in the air, and the drink will go flat. Given that Henry’s law constant K H =4.27×10 ^5mmHg p=760mmHg If X is the molar fraction then According to Henry’s law, p=K hX 760=4.27×105×X Divide by 4.27 × 105 ,we get Molar fraction, X =760 / 4.27*10^5 =178×10 ^−5
So that, the molar fraction of methane in BENZENE =1.78×10 ^−3 . |
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| 23. |
2. Why does aqueous solution of an acid conduct electricity? |
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Answer» Answer: Acids undergo dissociation in AQUEOUS solution to form H+ ions. When electricity is PASSED through an aqueous solution of an acid, the H+ ions reach the cathode and each H+ ION picks up one electron from the cathode to form H2 gas. Because of this reaction, an aqueous solution of acid conducts electricity. |
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| 24. |
Calculate the frequency, energy and wavelength of the radiation corresponding to the spectral line of lowest frequency Lyman series in the spectra of hydrogen atom. |
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Answer» I can't UNDERSTAND the QUESTION SORRY MATE . |
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| 25. |
XERCISES3,6 Classily the following elements into the types and theblocks in which they belong in the periodic tableNa, K, Cl, Hg, ce, Ra, Zn3.7 Which of the following radii of an atom is the smallest1) H. HeClin N, O3.12 A,B,CarZ-1,ZBas. Predе ме() whichenergcin) whici) whoiv) wheSlightlyCovalent radius, crystal radius, van der Waals radiusAns.Covalent radius3. Which of the following pairs are isoelectronic?(1) NA, MBAns),3.9 The ionisation energy of His 1312 W mol Howmuch energy is required to ionise 100 gram atoms ofhydrogen!Ans, 6.56 x 10 W5.10 i requires 2.378 * 10' ) energy to ionise a certainamount of helium gas. If ionisation energy of heliumis 2376.0 W/mol, calculate the amount of helium gaslonisedAno 10 moles3.11 Which element in each of the following pairs wouldyou expect to have higher first ionisation energy andver, the3.13 Whynegati3.14 CalculConvedows3.15 Whicwoul(1) KO1639 |
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Answer» Answer: PLEASE send the details of my account for the solution is to be done by the end of this WEEK or next couple weeks are going out of town this weekend but will see if I can FIND it on my way back from the clear coat and boots are you going up there and get back to you with a new BABY is born and brought up to the office today but I will be in a meeting will call when we get back to the office I will send it in a bit to PICK you up at evening I |
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| 26. |
At STP, 50, gos Occupidin 67.2LCALCULATETHC MASS GAS in it (atomic mass of s=32 o=16 |
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Answer» Answer: ok 1ST MARK as BRILLIANT and follow Explanation: |
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| 27. |
The number of protons, electrons and neutronsrespectively in the element 28 Y are(1) 93, 93, 93(2) 144, 93, 93(3) 93, 93, 144(4) 93, 144, 93 |
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Answer» please send a picture of the clear to close the account and get back with me as soon as you can get a BETTER if you were playing with you guys for the keys to the car and I am so much for the quick response I will be there in a bit I'm GOING to TRY to make it in today I have a meeting with you and the family have a merry and I have been trying the new JOB and I have to get up at evening |
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| 28. |
4. I am used as a disinfectant to sterilize water5. I am a poisonous metal used in making flexible water pipes6. I am a metal and placed above iron in the activity series i undecorrosion compared to ironI am a reactive non metal and i am stored in water& I am a metal and exist the liquid state at room temperature. Ireferred to as liquid silverआई एम यूज्ड एस ए डिसइनफेक्टेंट टू तेरी लाइफ वाटर |
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Answer» Answer: 4=> chlorine 5=>lead 6=>ZINC 7=>phosphorus 8) zinc |
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| 29. |
Which of the following will have minimum wavelength?(a)n4 to n1(b) n2 to n1(c)n4 to n2(d) n3 to n1 |
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Answer» d N3 to n1 Explanation: |
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| 30. |
(3) H2O > CO2(4)CHA < CCIA26. In which of the following reactions, hybridisation of underlined atoms does not change?(1) 2PCi5 - PCI + PCI.(2) 2502 +02-2S03(3) LiH + AlH3 -- LIAIHA(4) BF3 + H-F - HBF40-0 bond length |
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Answer» Answer: follow me Explanation: Let us discuss each of the given reactions in detail. (A) P
H 3
+H + →PH 4 +
The hybridization of P remains the same, i.e., sp 3 hybridization. In PH 3
, P atom contains 3 bond pairs of electrons and one lone PAIR of electrons. In PH 4 +
, P atom contains 4 bond pairs of electrons. (B) B
F 3
+H 2
S→H 2
S→BF 3
The hybridization of B changes from sp 2 to sp 3 . In BF 3
, B contains 3 bond pairs and zero lone pair of electrons. In H 2
S→BF 3
, B contains 4 bond pairs of electrons and zero lone pair of electrons. (C) H 3
B
O 3
→HBO 2
+H 2
O The hybridization of B changes from sp 2 to sp. In H 3
BO 3
, B contains THREE bond pairs of electrons and zero lone pairs of electrons. In HBO 2
, B contains two bonding domains. (D) 2H Cl
O 2
→HClO+HClO 3
The hybridization changes from sp 3 to no hybridization. In HClO 2
, Cl has 2 bonding domains and 2 lone pairs of electrons. It undergoes sp 3 hybridization. In HClO 3
, Cl has 3 bond pairs of electrons and 1 lone pair of electrons and undergoes sp 3 hybridization. Hence, the first and FOURTH reactions do not undergo any change in the hybridisation of the underlined atom |
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| 31. |
State and explain law of conservation of mass |
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Answer» law of CONSERVATION of mass states that ENERGY is NEITHER created nor be DESTROYED during a chemical reaction |
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| 32. |
Wull dill not malleable4. I am used as a disinfectant to sterilize water |
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| 33. |
When a fine beam of light enters a room through a small hole, Tyndall effect is observed. Why does this happen?1 pointReflection of light by the gases present in airRefraction of light by the gases present in airScattering of light by dust particles present in airScattering of light by the gases present in air |
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Answer» SCATTERING of LIGHT by DUST PARTICLES |
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| 34. |
in infra red region of the spectrum of h a line is obtained have wave no:3802cm inverse.calculate the wavelength and frequency |
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Answer» 52.279 x 10-28 J Explanation: We know that , FREQUENCY(v) can be calculated as follows: λv = C where λ = 3802 x 10-2 m c = 3 x 108 m/s Frequency, v = (3 x 108 m/s) / 3802 x 10-2m = 7.89 x 106 s-1 Energy = hv where h = 6.626 x 10-34 J/s Hence, energy of the photon = 6.626 x 10-34 J/s x 7.89 x 106 s-1 = 52.279 x 10-28 J |
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| 35. |
Which digit is not significant in the begining of a number |
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Answer» Answer: zero is the answer. Explanation: PLEASE mark it BRAINLIEST
All fats, INCLUDING SATURATED fatty acids, have important roles in the body. However, the most important fats are those that the body cannot make and thus MUST come from the food we eat. These essential fatty acids (EFAs) are based on linoleic acid (omega-6 group) and alpha-linolenic acid (omega-3 group). |
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| 36. |
Activity 2.1211. Put about 2 g soil in a test tube and add 5 ml water to it.Shake the contents of the test tube.Filter the contents and collect the filtrate in a test tube.Check the pH of this filtrate with the help of universal_indicator paper..What can you conclude about the ideal soil pH for the growth ofplants in your region? |
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| 37. |
Change in number of protons in an aton changes to |
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Answer» Adding or removing protons from the NUCLEUS changes the CHARGE of the nucleus and changes that ATOM's atomic number. So, adding or removing protons from the nucleus changes what element that atom is! For example, adding a proton to the nucleus of an atom of hydrogen CREATES an atom of helium. Explanation: hope it helps you...!!!... |
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| 38. |
Calculate the volume % of Chlorine at equilibrium in PCL 5 under a total pressure in 1.5 ATM (Kp= 0.202) |
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Answer» Answer: please let me know if you have time you in the OFFICE today so I can get the KEYS to my HOUSE to get my eyeballs me to do anything please don't have a lot in the morning and then how can we make sure that we have been invite you to the moon and BACK to you on that |
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| 39. |
Mosley modified periodic law. |
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Answer» Answer: yes he modified it by GIVING the FUNCTION of ATOMIC weight to atomic number plzz Mark me as BRAINLIEST |
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| 40. |
1. Which is correct 'closest approach distance (min) in aparticle experiment when a particle is directed towardsgold nuclei with potential of 10 megavolt. (Z = 79) : |
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Answer» Answer: vqdwdyxuwcigvsqqvcq qwdvchwiqhvdy8e xbdwu8wdwcwoewc guqw9cddwcuweygwrcoq spider MAN is 3CM and the following EQUATIONS are CONSISTENT |
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| 41. |
What steps must be followed when a solid metal get converted to m^2+ in aqueous form |
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Answer» Answer: A metal ion in aqueous solution or aqua ion is a cation, dissolved in water, of chemical formula [M(H2O)n]z+. The solvation number, n, determined by a variety of experimental methods is 4 for Li+ and Be2+ and 6 for elements in periods 3 and 4 of the periodic table. Lanthanide and actinide aqua ions have a solvation number of 8 or 9. The strength of the bonds between the metal ion and water molecules in the primary solvation shell increases with the electrical charge, z, on the metal ion and decreases as its ionic radius, r, increases. Aqua ions are subject to hydrolysis. The logarithm of the first hydrolysis constant is proportional to z2/r for most aqua ions. The aqua ion is associated, through HYDROGEN bonding with other water molecules in a secondary solvation shell. Water molecules in the first hydration shell exchange with molecules in the second solvation shell and molecules in the bulk liquid. The RESIDENCE time of a molecule in the first shell varies among the chemical elements from about 100 picoseconds to more than 200 years. Aqua ions are prominent in electrochemistry.... Here is ur answer...✌️✌️ |
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| 42. |
H2o2 act as bleaching agent ?explain |
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Answer» Explanation: HYDROGEN Peroxide(H2O2) acts as BLEACHING agent DUE to the release of nascent oxygen. H2O2→H2O+[O] The nascent oxygen combines with colouring MATTER which in turn GETS oxidized. please mark as Brainlest |
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| 43. |
Name a,b,c,d,e, and f in the following diagram change in its state |
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Answer» A - Solidification B - Vapourisation C - Condensation D - Fusion E - Sublimation F - Deposition Hope This HELPS !! |
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| 44. |
Can you explain the black body radiation on the basis of electromagnetic wave theory. Justify. |
Answer» All normal matter at temperatures above absolute zero emits ELECTROMAGNETIC radiation, which represents a CONVERSION of a BODY's internal thermal energy into electromagnetic energy, and is THEREFORE CALLED thermal radiation.An object that absorbs ALL radiation falling on it, at all wavelengths, is called a blackbody.Hope it helps you ✨Be Brainly 〰️ ✌️ItzBrainlyAnyu ✌️ |
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| 45. |
What is the mass of 3.01*10^22 molecules of ammonia |
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Answer» ANSWER: MULTIPLY it with 1.66 × 10^-27 kg Explanation: |
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| 46. |
What is the volume required to a 20% HCl solution of density 1.2 g/ml to prepare 363g of AsCl3 (As=75,Cl=35.5) |
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Answer» (As=75,CI=35.5) .......... |
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| 47. |
Valancies of Ca and SO4 group in CaSO4 |
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| 48. |
Calculate the molarity of 1.193m Lead sugar solution whose density is 1.2489g/ml |
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Answer» I don't know what you mean so can you solve it yourself or can you ask your MOM or DAD |
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| 49. |
A car goes from a town A to another town B with a speed of 40km/hr and returns back to town A with a speed of 60 km/hr the average speed of the car during the complete journey is |
Answer» Answer:-Let the distance between town A & B be "d". Let us ASSUME that the car takes t1 to COVER from A to B with a speed of 40 km/h and t2 to cover from B to A with the speed 60 km/h. We know that, Time = Distance/speed Hence, → t1 = (d/40) hrs. and, → t2 = (d/60) hrs. We know that, AVERAGE speed = (Total distance travelled) / total Time taken
→ Average speed of the car = (d + d) / [ (d/40) + (d/60) ] → Average speed of the car = 2d / [ (3d + 2d) / 120 ] → Average speed of the car = 2d / [(5D) / 120] → Average speed of the car = 2d * (120/ 5d) → Average speed of the car = 48 km/hHence, the Average speed of the car is 48 km/hr. |
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| 50. |
Common salt can be separated from Iodine in their mixture by. evaporation sublimation filtration sedimentation |
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Answer» COMMON SALT can be saperated from IODINE by the PROCESS of EVAPORATION. |
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