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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. |
9 Р.Reason:- The C=0 in carboxyl group Is Il Tesonal ICU WILITAssertion:- Ketones are more reactive than aldehydes towards electrophilic additionReason:- The alkyl groups in ketone increase the electron density on the carboxyl carboncarbon through +I effect. |
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Answer» Reason:- The ALKYL groups in KETONE increase the ELECTRON density on the carboxyl carbon Reason:- The alkyl groups in ketone increase the electron density on the carboxyl carboncarbon through +I EFFECT. |
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| 2. |
In the periodic table, helium is placed at *• top right corner• bottom right corner• bottom left corner• top left corner |
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Answer» Answer: |
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| 3. |
Across the period the atomic size decreases due to *• decrease in nuclear force of attraction• shielding effect• increase in nuclear force of attraction• None |
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Answer» INCREASE in NUCLEAR FORCE of attraction Explanation: I hope this will help |
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| 4. |
The ability of an atom to attract electrons towards itself is called *• deshielding effect• electronegativity• electron affinity• electropositivity |
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Answer» Answer: ELECTRONEGATIVITY is defined as the ABILITY of an atom in a particular molecule to ATTRACT electrons to itself. The GREATER the value, the greater the attractiveness for electrons. |
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| 5. |
What's the name of c6h5_ch_br_ch3 |
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Answer» Phenyl_Benzene_Bromine_Carbide |
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| 6. |
(a) Mira measures the height 'h' of the liquid in the glass tube. Mira then places the boiling tube into abeaker of water and ice. What happens to the height of the liquid in the glass tube? |
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Answer» no change in the height of water. Explanation: ACCORDING to the Archimedes PRINCIPLE , the floating substance DISPLACES some liquid, so when the ice melts ,there will be no change in the water level as the melted ice will OCCUPY the same volume as it was occupying earlier. |
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| 7. |
Co[(NH3)]3+ ion is - |
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Answer» Explanation: (i) The IUPAC NAME of the complex ion is [Co(NH
) 6
] 3+ hexammine cobalt (III) ion. (ii) The oxidation number of cobalt in the complex ion is +3 . (iii) The type of HYBRIDISATION of the complex ion is d 2 3 . (iv) The complex ion is diamagnetic due to absence of unpaired electrons. |
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| 8. |
State the number of atoms present in carbonate ion and magnesium hydroxide. |
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Answer» Answer: n a reaction 5.3 g of sodium carbonate reacted with 6 g of ETHANOIC ACID. ... Which postulate of Dalton's atomic theory can explain the law of definite PROPORTIONS? ... Calculate the number of aluminium ions present in 0.051 g of aluminium oxide. |
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| 9. |
The maximum number of Orbital that can be present in subshell with notation 'g' |
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Answer» ANSWER: HENCE, the MAXIMUM number of ORBITALS identified by the given quantum number is only 1, i.e. 3pz
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| 10. |
6. Why is it necessary to ban plastic bags? |
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Answer» Plastic bags never degrade COMPLETELY, which shows that as more of them are PRODUCED by companies, more are introduced into the environment. Therefore, the more the amount of plastic bags, the more there is plastic pollution and its effects. Banning the USE of plastic bags will help REDUCE this great effect. |
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| 11. |
Explain Dalton theory |
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Answer» Dalton based his THEORY on the LAW of conservation of MASS and the law of constant composition.so this is the Dalton theory. |
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| 12. |
Explain the minimum air requirement ( Stoichiometric AirRequirement) for complete combustion of following fuel by mass and by volume:(i) Hydrogen (ii) Methane |
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| 13. |
Which chemical applying copper coins the needle will push |
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Answer» Answer: MAGNET of poles which will be pull or push the copper COINS Hope it will HELP you |
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| 14. |
A____reactive metal displaces a less reactive metal from its compoundsHint:Worksheet 2,Fill in the blanks and chapter is ch-2 class 9 chemical changes and reaction. Please answer fast⚡.Guys show your power |
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Answer» most is the answer COME here Explanation: mjr-tdho-oaw |
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| 15. |
C8. Located beside LarsMann hill about3000 km east of Maitriwasestablished in 2015 *(1 Point)HindustanBhartiO MaltriShatru |
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Answer» jgdgjxgjxjteitdgkxgkdyofhc |
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| 16. |
Write a short note on hardness of water. |
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Answer» Answer: The SIMPLE definition of WATER hardness is the amount of dissolved CALCIUM and magnesium in the water. HARD water is high in dissolved MINERALS, largely calcium and magnesium. ... When hard water is heated, such as in a home water heater, solid deposits of calcium carbonate can form. |
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| 17. |
Briefly explain the characteristics of chemical reaction with examples. (Who give me answer I mark it as Brainliest) |
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Answer» Some chemical reactions are characterised by the evolution of gas. For Ex:1)Reaction between zinc and dilute sulphuric acid to form HYDROGEN gas. 2)Reaction between SODIUM carbonate and dilute hydrochloric acid to form carbon dioxide gas. Some chemical reactions are characterised by the FORMATION of precipitate. Explanation: happy 2 help :) mark as brainliest |
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| 18. |
CH-CNC-OH| CNCH-CNiupac name of this compound |
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Answer» Don't UNDERSTAND |
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| 19. |
Q. If A=40, n=22. e=_______Selectthe correct option1) 272)283)194)22 |
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Answer» If A=40, n=22. e=_______Select the CORRECT option 1) 27 2)28 3)19 4)22 |
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| 20. |
A compound with molecular mass of 60.0g/mol is found to contain 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen.What is the molecular formula |
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Answer» Explanation: A compound with molecular mass of 60.0g/mol is FOUND to contain 40.0% carbon, 6.7% HYDROGEN, and 53.3% oxygen.What is the molecular FORMULA |
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| 21. |
4) Draw the structure of c) 2 - chloropentane |
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Answer» PLS MARK me as BRAINLIEST |
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| 22. |
13. आणविक कक्षक सिद्धांत क्या है? 0; की वियोजन ऊर्जा 0, से अधिक क्या है? |
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Answer» ADVENTURE adventure GRANDMOTHERLY |
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| 23. |
The solutions having particles size less than 1nm are(a) chalk powder in water (b) starch solution (c) sand in water (d) salt water |
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| 24. |
2. What is the number of valence electrons in:(a) Sodium ion (b) Oxide ion |
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| 25. |
Complete the reactions 1) CuSO4 + Zn 2) SO2 + H2O 3) Msg +O2 |
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Answer» Answer: Ammonia Pharmaceutical OverviewExamplesPeople also search for Ammonia is a COMPOUND of nitrogen and HYDROGEN with the formula NH₃. A STABLE BINARY hydride, and the simplest pnictogen hydride, ammonia is a colourless gas with a characteristic pungent smell. Wikipedia Formula: NH3 IUPAC ID: Azane Molar mass: 17.031 g/mol Boiling point: -33.34 °C Density: 0.73 kg/m³ Melting point: -77.73 °C |
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| 26. |
What is the name of elements RCH2OH |
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Answer» Answer: The chemical NAME of the OBTAINED PRIMARY alcohol is ethanol and its molecular FORMULA is . |
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| 27. |
Explain hyperconjugation effect. how does hyperconjugation effect explain the stability of alkenes. |
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Answer» The stability of UNSATURATED hydrocarbons like nitriles, alkenes effects with hyper conjugation. ... Hence as the number of ALKYL group on double bonded carbon atoms increases, hyper conjugation increases which stabilized the MOLECULE. Or more SUBSTITUTED alkenes are more stable than less substituted alkenes. |
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| 28. |
Why is nitrogen used for filling the packets of chip |
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Answer» Answer: Oxygen is highly-reactive, so this means it likes to COMBINE with other molecules, which results in FOOD spoiling or losing its' freshness. By USING nitrogen to push out the oxygen in chip BAGS, the shelf life is extended, and the integrity and QUALITY of the chips and snacks are kept. |
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| 29. |
Enlist two information which make a chemical reaction more useful |
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Answer» Answer: (a) The various WAYS in which a chemical equation can be made more informative are : (i) By INDICATING the physical states of the reactants and products. EXAMPLE: GASEOUS state is indicated by the symbol (g). (ii) By indicating the heat CHANGES taking place in the reaction. Explanation: MAKE ME BRAINLY |
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| 30. |
calculate the rate of percolation of the soil of it takes 20 Min for 100 ml of water to percolate through 100 grams of soil |
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Answer» Answer: |
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| 31. |
(C)38. Hydrogen peroxide is used to restore the colour of old oil paintings containing lead oxide. Explain.39. In what way is the crystalline form of water of great ecological significance?40. On what principle does the ion-exchange method works for the softening of hard water?41. Calculate the amount of H2O2 present in 20 ml of 30 volume H,O, solution.42. Hydrogen generally forms covalent compounds. Give reason.43. Name one compound in which hydrogen occurs in (a) +1 and (b) -1 oxidation state.44. Complete the following reactions :(a) AIN + H2O(b) Cacz + H2045. Explain the hydroformylation reaction of olefins. |
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Answer» Answer: An Internet SERVICE provider is an ORGANIZATION that provides a MYRIAD of SERVICES for accessing, using, or participating in the Internet. Internet service providers can be organized in various forms, such as commercial, community-owned, non-profit, or otherwise PRIVATELY owned. |
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| 32. |
Can we say that Alpha particle (He2+) have no electrons and it has lost its two electrons to become an ion?????And does it have +2positive charge |
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Answer» Answer: Because an alpha particle has no electrons to BALANCE the POSITIVE charge of the two protons, it has a charge of +2 and can be represented as HE2+. ... Thus He2+ means a HELIUM atom that has lost two electrons and has a +2 charge. Explanation: |
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| 33. |
Calculate number of atoms in: (Atomic masses: N=14u, H=1u)(i) 100 g of nitrogen gas |
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Answer» Answer: 2.15 X Mass of Nitrogen GAS( Molar mass of Nitrogen gas( No. of moles in No. of atoms = 3.57 x = 3.57 x 6.022 x = 21.5 x = 2.15 x |
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| 34. |
CH3-CH(OH)-CH2-CH2-CONH2 what is the iupac name |
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Answer» CH3-CH(OH)-CH2-CH2-CONH2 =CHLORIDE IONS contact Explanation: HOPE it is helpful and thx to my answer and MARK it as brainliest |
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| 35. |
How will you convert methyl bromide to ethane? |
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Answer» Explanation: Methyl bromide is CONVERTED into ethane by heating it in ETHER MEDIUM with Na |
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| 36. |
19. Below questions are based on the Table. Study this table related to meltingpoints and boiling points of different substances and answer the followingquestions. (a) Name the substances from Table A that we can find in liquid stateat room temperature (25 °C) (b) We are heating a bowl of water and a bowl ofethanol separately. We start from the same temperature and heat them on asimilar kind of flame. Which bowl will get empty first? (c) What does the meltingpoint of a solid indicate? (d) Glycerol is heated from 0 °C to 50 °C. When thetemperature reaches 17.8 °C, the temperature remains constant for a while andonly after some time, it starts to increase again. Why?Boiling point (°C)-57-42Component nameCarbon dioxidePropaneEthanolWaterGlycerolMelting point (°C)-78-188-114078.410029017.8 |
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Answer» Answer: 19. Below QUESTIONS are based on the Table. Study this table related to melting points and boiling points of different substances and answer the following questions. (a) Name the substances from Table A that we can find in liquid state at room temperature (25 °C) (b) We are heating a bowl of water and a bowl of ethanol SEPARATELY. We start from the same temperature and heat them on a similar KIND of flame. Which bowl will get empty first? (c) What does the melting point of a solid indicate? (d) GLYCEROL is heated from 0 °C to 50 °C. When the temperature reaches 17.8 °C, the temperature remains constant for a while and only after some time, it starts to increase again. Why? Boiling point (°C) -57 -42 Component name Carbon dioxide Propane Ethanol Water Glycerol Melting point (°C) -78 -188 -114 0 78.4 100 290 17.8 |
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| 37. |
An element that has three letters in its symbol. |
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Answer» ☞￣ᴥ￣☞ TIN . |
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| 38. |
Good morning freinds,how are you allwhat is the difference between good and bad |
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Answer» What are you SAYING for. |
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| 39. |
ख-कविता में आए तीन तत्सम शब्द लिखिए। (3) |
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Answer» Answer: |
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| 40. |
Why tv ads are called as commercials? |
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Answer» Answer: A television ADVERTISEMENT (ALSO called a television commercial, commercial, ADVERT, TV advert or SIMPLY an ad |
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| 41. |
4. What is demineralized water? Is it fit for drinking purposes?Why hard water does not form lather with soap? |
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Answer» Demineralised WATER that has not been remineralized, or low-mineral content water – in the light of the absence or substantial lack of essential minerals in it – is not considered ideal drinking water, and therefore, its regular consumption may not be providing adequate levels of some beneficial nutrients. Soap contains SODIUM salt from stearic acid. In soft water, this sodium dissolves easily, but in HARD water, it binds to the minerals and produces insoluble CALCIUM or magnesium STEARATE, also known as soap scum |
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| 42. |
Board & Competitive Exams (Level-1)34. What is demineralized water? Is it fit for drinking purposes?35. Why hard water does not form lather with soap?36. What are interstitial hydrides? Give three examples.37. Complete the following reactions(a) P.010(s) + 6H2O(l) ——(b) SICI,(0) + 2H2O(l) ——(c) N3-(s) + 3H,O(1) ►lour of old oil paintings contain |
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Answer» Answer: 34. Demineralised or distilled water is not drinking purposes since it does not contain even useful minerals . Therefore, to make it useful for drinking purposes, useful minerals in proper amounts should be added to demineralised or distilled water. ... Therefore, even demineralized water is fit for drinking purposes. 35.Soap contains sodium salt from stearic ACID. In soft water, this sodium dissolves easily, but in hard water, it binds to the minerals and produces insoluble CALCIUM or magnesium stearate, also known as soap scum. 36.Example –1) Lithium Hydride (LiH), Sodium Hydride (NaH), POTASSIUM hydride (KH). 2)Molecular hydride: These kinds of hydrides are FORMED by electron-rich compounds (GENERALLY p-block elements). 3)Interstitial hydride: These are also known as metallic halides. This type of halide is generally formed by d-block elements. 37. sorry but I don't know the ans:-( Explanation: mark as brainliest hope it's help |
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| 43. |
If the equilibrium H2O (s) = H2O (l) is observed at a pressure of 1 atm at 100oC, what is the temperature of the ice-water mixture? |
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Answer» Sabarmati River Sabarmati River, originates on the western SLOPES of Aravalli RANGE of the Udaipur District, end into the Gulf of Cambay of the Arabian SEA. |
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| 44. |
How many valence electrons does nitride ion have? please answer fast!!! |
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Answer» Each N3- ion has 8 valence ELECTRONS, so total number of valence electrons = 1.8 X 10^23 X 8 = 1.4 X 10^24 valence electrons. |
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| 45. |
The element which have 2 valency to k and l having 2 and 6 electron |
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| 46. |
Give two diferences between saturated and unsaturated compound |
Answer»
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| 47. |
Sunlight and Air are inexhaustible natural resources. Comment. |
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Answer» These resources are PRESENT in unlimited QUANTITY in nature and are not likely to be EXHAUSTED by human ACTIVITIES. |
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| 48. |
The As in a 9.13-g sample of pesticide was converted to AsO4 3- and precipitated as Ag3AsO4 with 50.00 mL of 0.02015 M AgNO3. The excess Ag+ was then titrated with 4.75 mL of 0.04321 M KSCN. Calculate the % of As2O3 in the sample |
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Answer» a. When an object falls freely to the ground, it is under the effect of a constant force known as force of gravity. No other forces act on it. Hence, from Newton's SECOND law of motion, we can say that this constant force of gravity accelerates the the freely opposite, their effects do not get cancelled because these action and reaction forces do not act on the BODY. ball has s ball than a CRICKET ball moving with the same velocity. b. Even though the MAGNITUDES of action force and reaction force are equal and their directions are opposite, their effects do not get cancelled. c. It is easier to stop a tennis ball as compared to a cricket ball, when both are travelling with the same velocity. d. The velocity of an object at REST is considered to be uniform... |
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| 49. |
In science a vacuum is delined - nace that contains ahsalutely namaille (na malgoules no moms.oic encres beiransferred| hear through a vacuum? Why or why not? Howan ihan Gary beIransferred through vacuum! |
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Answer» because the SKY is very high Explanation: |
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| 50. |
Schematic atomic structure of first 20 elements |
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Answer» hope this will help you |
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