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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. |
Azimuthan quantum number for last electron in Na atom is |
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Answer» ONG>Answer: right now I have a GREAT day I was so HAPPY for the first day and I have |
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| 2. |
when a crystal of potasium pramagrinade is placed at the bottom of waterin beaker the water of whole beaker turns purple on its own , even without string . this is an example of: |
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Answer» ong>ANSWER: PROCESS is know as diffusion.. because of random movement of potassium PERMANGANATE particles it spread slowly throughout the water and forms a dense PURPLE SOLUTION |
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| 3. |
Which is the d block element shows maximum oxidation state. |
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Answer» ong>EXPLANATION: hope this will help....... |
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| 4. |
Difference between group 2A and 2B elements in modern periodic table ? |
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Answer» ong>Explanation: The alkaline EARTH METALS have TWO valence ELECTRONS in their highest-energy orbitals (ns2). They are smaller than the alkali metals of the same period, and therefore have higher IONIZATION energies. In most cases, the alkaline earth metals are ionized to form a 2+ charge. please mark my answer as brainliest |
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| 5. |
Solubility of NaCl at 40°C is 36-5 g. What is meant by thisstatement |
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Answer» It means that the SATURATION POINT of water is attained when 36.5 g of NACL is added to 100 g of water at 40°C No more NaCl will be dissolved later Please MARK me BRAINLIEST |
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| 6. |
Represent the galvanic cell in which the reaction, Zn(s) + Cu2+ (aq) -----→ Zn2+(aq) + Cu (s) takes place. |
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Answer» ong>Answer: The GALVANIC cell in which the given reaction takes place is depicted as: (i) Zn electrode (ANODE) is negatively charged.
(ii) Ions are CARRIERS of current in the cell and in the external circuit, current will flow from silver to zinc.
(iii) The reaction taking place at the anode is given by, Zn(s) → Zn2+(aq) + 2e- The reaction taking place at the CATHODE is given by, Ag+(aq) + e- → Ag(s) |
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| 7. |
Which has maximum number of unpair electron X |
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Answer» ong>Answer: their 4 unpaired electrons Explanation: |
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| 8. |
Lewis dot structure of h20 |
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Answer» ong>ANSWER: Explanation: if yes please Mark my QUESTION as BRAINIEST |
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| 9. |
a barrel can hold 29 litre 55 of oil 12 litre 94 millimetre oil was taken out what is a remaining quantity of oil the barrel |
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Answer» ong>EXPLANATION: 29litre55mililetre-12litre94mililetre =16litre906mililetre hope it helps you |
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| 11. |
Why do isotopes have similar chemical properties |
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Answer» ong>ANSWER: All atoms of the same element have the same number of protons, but some may have different numbers of neutrons. ... Different isotopes of an element GENERALLY have the same PHYSICAL and chemical PROPERTIES. That's because they have the same numbers of protons and electrons |
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| 12. |
What are the major difference between metals and non-metals |
Answer» ALS
NON METALS
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| 13. |
What is oxidation number |
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Answer» ong>Explanation: Oxidation NUMBER, also called Oxidation state, the total number of electrons that an ATOM either gains or loses in ORDER to form a chemical bond with another atom. please follow me and make me as BRAINLIST..... |
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| 15. |
1 State one example each characterised by the following alongwith the chemicalequation:() Change in state (ii) Evolution of gas(iii) Change in temperature CBSE 2016 |
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Answer» ONG>Answer: 1) ice melting to WATER 2)water EVAPORATES from rivers 3)milk is heated up and boiled |
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| 16. |
Who is the first scientists to prepare the periodic table |
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Answer» ONG>ANSWER: MENDEL................. |
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| 17. |
Merits of Newlands law of octaves |
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Answer» ong>Answer: Merits: (i) This classification worked well for LIGHTER elements only up to CA. (ii) This classification gave us a relation between the properties of the elements and their atomic masses.(III) It was shown by this classification for the first TIME that there EXISTS a periodicity in the properties of the elements. Hope it helps you.!! |
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| 18. |
Current of 2.6 ampere is passed through CuSO4 solution for 6 minutes 20 seconds. The amount of Cu deposited is (At. wt. of Cu = 63.5, Faraday = 96500 C) |
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Answer» ong>Answer: sh ddj dhx xuc cud zu Duc cud XI cjx xhx sjd jz XIZ zhdbxv. c Explanation: jz zjx sis sudbxi |
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| 19. |
Ques 1: Calculate the molarity of a sulphuric acid solution in which the mole fraction of water is 0.85. |
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Answer» ong>EXPLANATION: MOL FRACTION of water in SOLUTION = 0.85 So mol of acid = 1-0.85 = 0.15 Now m= nw×molecularwtofwater 1000×molofacid m= 0.85×18 1000×0.15 =9.8mol/kg |
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| 21. |
In sulphur system,degree of freedom for triple point is |
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Answer» he TRIPLE point there are three phases in equilibrium, but there is only one point on the DIAGRAM where we can have three phases in equilibrium with each other. We SAY that at the triple point: f=c–p+2 =1–3+2 = 0 degrees of freedom. 18. The Sulphur SYSTEM Sulphur solid exists in two crystalline forms. Mark me as brainliest....... |
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| 22. |
In the formation of ammonia molecule , nitrogen attains the stable electronic configuration of a) Heliumb) Neonc) Argon |
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Answer» ONG>Answer: answer is b after FORMATION of ammonia 10e- on N |
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| 23. |
Q. What is the decreasing order of reactivity SN2 reaction ?—1 - Bromo - 2,2-dimethypropane1- Bromopentane1-Bromo-2-methylbutane |
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Answer» ONG>Answer: 1 - Bromo-2-dimenthypropane 1 - bromopentane 1 - bromo-2-methylbutane Explanation: the SN2 reactions are sensitive to steric hindrance. greater the steric hindrance tot he attacking nucleophile, lesser will be REACTIVITY. |
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| 24. |
प्र.4) निम्नलिखित में से कौन सा शब्द संज्ञा शब्द हैख) तेरहग) उनकाघ) सभी विकल्प सही है |
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Answer» ONG>ANSWER: तेरह शब्द संज्ञा है। उनका शब्द सर्वनाम है। |
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| 25. |
Write two difference between structure of diamond and graphite |
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Answer» ong>Answer: Diamond and Graphite, both are known as the allotropes of carbon. These minerals chemically consist of carbon atoms with different physical properties. These minerals, in general, are known to be as polymorphs, having the same TYPE of chemistry, but of the various crystalline STRUCTURES. In these allotropes of carbon, the atoms consisting of carbon atoms in that of the Diamond and Graphite, are bound together by strong covalent bonds with different arrangements. Precious stone and graphite have shift structures which represent their diverse properties, and both are pure carbon. However, the graphite’s particles join to the three atoms of carbon and get associated with the plates that are parallel to each other. The particles of Diamond enter the four atoms of carbon in a GEM frame. Let us study the structure and the uses of both Diamond and Graphite in General. Structure of Diamond and Uses Structure: All the carbon atoms of Diamond are said to possess strong chemical bonds with that of the four other carbon atoms, thus making a perfect tetrahedron structure and on throughout the crystal. The carbon atoms, here are sp3 hybridized, and the bond lengths of carbon-carbon atom are equal. Hence Diamond forms a three-dimensional network of strong covalent bonds. Diamond has a very high melting point of about 3843 K and a high density of about 3.51 g/cm3. It is known to be a poor conductor of electricity since its valence electrons get involved in C-C sigma covalent bonds, and hence they are localized and are not free to conduct the electricity. Uses and Applications: Diamond is known to be the hardest substances on the Earth. It is USED in making of tools that are utilized for grinding, cutting, drilling, etc. Diamond is used in the manufacture of filaments made of tungstens used for light bulbs. It is used in the making of jewelry. Diamonds are used by most of the surgeons in the removal of the cataract from the eyes as a high precision instrument. Structure of Graphite and Uses Structure: All the carbon atoms in Graphite are said to have stable chemical bonds with that of the other three carbon atoms, thus making the sheets that look like chicken wire; the weak form of forces hold the sheet quickly. When you are composing with a pencil on the paper, it is these sheets that slide separately to desert the graphite pieces as a blemish on the Paper. The carbon atoms in the Graphite structure are sp2 hybridized and are directed in the same plane thus forming hexagonal rings. The rings have many layers of particles. Graphite is said to exhibit low electrical conductivity with a low density of about 2.26 g/cm3. Uses and Applications: Graphite powder is utilized as a lubricant in the form of dispersion material or powder. Graphite is widely used in lead pencils. It is used in the manufacture of electrodes of carbon employed in the electrolytic cells, as it is an excellent conductor of electricity. It is utilized in the making of graphite crucibles since it possesses high melting points. It is widely used in the nuclear reactors and moderators. KIKI DO U LOVE ME.....XD GOOD MORNING ALL MY MATES ☺️☺️ |
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| 26. |
Calculate the amount of water produced in gramby the combustion of 8 grams of methane |
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Answer» ong>ANSWER: According to the above equation, one mole of CH4 (8 G) on combustion gives one mole of carbon dioxide and 2 moles of WATER and 2 moles of water = 2 x [2 + 8] = 20 g of water. |
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| 27. |
I. The boiling points of hydrides of group 16 are in the order a) H2O > H2Te > H2S > H2Se b) H2O > H2S > H2Se > H2Hec) H2O > H2Te > H2Se > H2S d) None of theseii. Affinity for hydrogen decreases in the group from fluorine to iodine. What of the halogen acids should have highest bond dissociation enthalpy? a) HF b) HCl c) H Br d) HIiii. If cone, of reactant 'A' is increased 10 times and rate of reaction becomes 100 times. What is order to 'A'?a) 1 b) 2 c) 3 d) 4iv. The half life period of first order reaction is 1386 seconds. The specific rate constant of the reactions is.a) 0.5x10-2s-1 b) 0.5x10-3s-1 c) 5.0x10-2s-1 d) 5.0x10-3s-1v. The change required for the reductions of 1 mol of MnO2-to MnO2 is a) 1 F b) 3 F c) 5 F d) 6 Fvi. Which of the following statement is correct? a) E cell and of cell reaction both are extensive properties.b) E cell and of cell reaction both are intensive propertiesc) E cell is an intensive property while of cell reaction is an extensive property.d) E cell is an extensive property while of cell reaction is an intensive property. |
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Answer» ong>Answer: H2O ought to have the LOWEST BOILING point but it doesn't because of HYDROGEN bonding. Hydrogen Sulfide is -76*c. and is the minimum. Warmer still is Hydrogen Selenide with -41*c. |
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| 28. |
Find the scientific notation of 6.25×10^10÷1.25×10^6 |
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Answer» ong>Answer: |
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| 29. |
Ques. An element having variable valency 2 and 4a) Goldb) Silverc) Platinum |
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Answer» ONG>ANSWER: is the answer . |
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| 30. |
A sample of water is mixed with a surfactant. What will most likely happen to the viscosity of the water? Explain your answer. |
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Answer» ong>Answer: The VISCOSITY of water should decrease when a SURFACTANT is added to it. Explanation: Surfactants are basically the compounds that can LOWER the surface TENSION between two liquids, between a gas and a liquid, or between a liquid and a solid. In this case, when it is added to water, it can lower the surface tension of water, which can in turn disrupt and decrease the intermolecular forces in water. SINCE viscosity is directly proportional to the intermolecular forces in water, this should lead to the reduced viscosity of water. |
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| 31. |
2. The correct formula of rust is:(b)Fe304(a)Fe2O3(d) Fe3O4.XH20(c)Fe2O3.nH20 |
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Answer» ong>Answer: C. Fe2O3.32H2O Explanation: it's your correct answer give me a thanks ❤️ MARK as BRAINLIEST FOLLOW me |
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| 32. |
12. Electrolysis of molten NaCl is done. A. Write the chemical equation of the reaction taking place at the Cathode ? |
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Answer» ong>ANSWER: thanks for free POINTS |
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| 33. |
A sodium light gives off yellow that has a wavelength of 589nm . what is the frequency of this light |
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Answer» ONG>Answer: make me BRAINLIEST answer and FOLLOW me Explanation: Answer and Explanation: The SODIUM lamp produces yellow-orange light while the neon produces red color because the substance used in the lamp absorbs and EMITS different... |
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| 34. |
How do we remove rust from an iron article according to one marks |
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Answer» ONG>ANSWER: BY GALVANIZATION OR ANODIZATION Explanation: |
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| 35. |
How does graphite act as lubricants? |
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Answer» ong>Explanation: Graphite as a lubricant: Structurally in graphite, each CARBON atom is joined together with 3 other carbon atom through a WEAK BOND CALLED Vander Waal FORCES and gives a layer like appearance. ... This sliding ability accounts for graphite's usage as lubricant |
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| 36. |
a certain mass of chlorine gas occupies 750 cm3 e at a certain pressure when the pressure was changed 2.5 atmosphere it occupied 1500 cm3 what was the initial pressure if the temperature was kept constant during the complete operation |
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Answer» ONG>Answer: 5 ATM |
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| 37. |
1. Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following represents the type ofreaction involvedi. Displacementii Precipitationiii. Combinationiv. Double displacementb. iva. i and iionlyc. ii and ivd. i only |
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Answer» ONG>Explanation: PLS pls mark as brainliest |
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| 38. |
What is the dispersion medium in agel? |
| Answer» ONG>EXPLANATION: | |
| 39. |
Write the name and molecular formula of an organic compound having its name suffixed with-ol' andhaving two carbon atoms in the molecule. With thehelp of a balanced chemical equation indicate whathappens when it is heated with excess of conc.H.SO, |
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Answer» ONG>ANSWER: compound is ethanol Explanation: when excess of alcohol is heated with conc. SULPHURIC acid at 140°C, it forms diethyl ether on account of partial dehydration. 2C2H5OH---conc.H2SO4(ecxess)--->C2H5-O-C2H5+H2O When excess of conc. sulphuric acid is heated with ETHYL alcohol at 170°C, the alcohol is dehydrated to ETHYLENE gas. C2H5OH----conc.H2SO4(excess)----->C2H4+H2O |
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| 41. |
How to solve 14/17× 100% |
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Answer» ONG>Answer: 82.35 Explanation: 14×100 = 1400 1400÷17 = 82.35 |
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| 42. |
How do we remove rust from an iron article |
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Answer» ong>Answer: Mix water and BAKING soda into a thick paste and spread the paste all over the metal, making sure that rusty SPOTS are well COVERED. Let the paste sit on the object for an hour or so. Use STEEL wool or a wire brush to scour the object and remove the rust. Rinse the paste off with water and dry thoroughly. |
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| 43. |
Correct definition of nucleons |
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Answer» ong>Answer: the NUCLEUS is the center of the cell by the NUCLEAR membrane |
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| 44. |
3.38L of CO2 is liberated at 1 atmosphere pressure and 0°C when 100% pure sodlum carbonate is treated with excess dilute HCI. Mass of sodium carbonate reacted is |
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Answer» ONG>ANSWER: xhdystjgxkguchchdtguyyftr53q46237yy8fhhvdtr6e6re5r6gxgxraq44644315u99yjovjv xgycguhodyt6gichchchyfgugstuhofygjgudt7tyogjghhgihghoyfgugvj Explanation: hdhehshshsbhsshhsjshshshshshshhshshshshshshsshshshhsshshbsbssbhsshhshshshshshshshshshshshshshsshhshsshshhshshssbhdvsshbdhdbdbxjsbahsjhsjdjsjsjsjdjdjjshsjsnzhdtefysutw6e8w567kwj5suktd75ofgjidy4qytjw4tduyxjdydyuftschxgst |
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| 45. |
Calculate number of Z and A for helium |
Answer» ONG>Answer:I didn't UNDERSTAND the question properly first KEEP the question properly |
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| 46. |
Why a graphite is called black lead |
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Answer» ong>Answer: Graphite didn't come into WIDESPREAD use for writing until after the 1564 discovery of a very PURE graphite deposit in Borrowdale, ENGLAND. At the time, graphite was THOUGHT to be a type of lead and consequently was called black lead or plumbago. ... But lower quality graphite needs help to keep it in a usable form. |
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| 47. |
NH3 gas can be prepared by Haber's process as, N2(g) + 3H2(g) → 2NH3(g). At a particular moment concentration of all the species is2 moles; calculate the concentration of N2 and H2 taken initially. |
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Answer» ONG>Answer: ok Yes, you've pretty much reached Genius status when you've been answering and helping your Brainly peers for a long time, posting thoughtful, high QUALITY answers. You know your way around Brainly like the back of your hand and others trust you for your insightful and extremely helpful solutions to their questions. You truly are the best of the best, an exemplary Brainly user and have reached the pinnacle of your Brainly career. Keep up the good work! danielstevegabby danielstevegabby Rank: Expert 2613/3000 20/15 Your influence 1 Answering Streak Your Streak is on! Answer another question tomorrow and keep it going. FUN fact An apple, potato, and onion all taste the same if you eat them with your nose plugged 1 2 2 Get +4 bonus 2 Last 7 days Overall Your stats from the last 7 days compared with the previous 7 days Popularity 102 People learning from your answers. +3% Brainliest 4 This many users said your answers were the best! Thanks 13 Your effort is appreciated! +18% Questions answered 29 +20% 16 Sep - 22 Sep 1 Wed 1 Thu 14 Fri 4 Sat 9 Sun 0 Mon 0 Tue English 12 Math 4 Biology 4 Geography 4 Social Sciences 3 Physics 1 Chemistry 1 Show More My challenges Answer 10 questions from any subject in 48 hours to collect 100 points
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| 48. |
An element A has 4 neutrons, 3 protons and 2 electrons. A represents |
| Answer» ONG>Answer: | |
| 49. |
Differentiate between solute and solvent |
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Answer» ong>ANSWER: In a homogeneous mixture, the smaller amount is the solute, and the larger amount is the solvent. When dissolving a solute into a solvent they MAKE a solution. Explanation: this is correct answer please please please mark me in BRAINLIST please please please |
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| 50. |
Calculate the average atomic mass of Mg using the followinf data% Natural Abudance.&. Molar mass24Mg. 80. 2425Mg. 10. 2526Mg. 10. 25 |
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Answer» ong>Answer: Change each percent abundance into decimal FORM by DIVIDING by 100. Multiply this value by the atomic mass of that isotope. Add TOGETHER for each isotope to get the average atomic mass. |
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