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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. |
What is the concentration of solution if 30 gram of lime stone dissolves in 250 gram of water |
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Answer» MOLES of limestone =30/mol. MASS moles 30/100=0.3 molality=moles/ mass of SOLUTION in solventin kg mass=0.25kg molality=0.3/0.25=1.2molal |
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| 2. |
From 48 gram of helium ,6×10^23atom are removed then find the mass of carbon atom which contain same number helium atom are left |
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Answer» Answer: We know by Avogadro NUMBER that, 6.023 x 10^(23) no. of ATOMS of Helium make 1 mole that is equivalent to molar MASS of Helium approximately 4 grams. Thus, 6.023 x 10^(24) atoms of Helium = (1/(6.023 x 10^(23) ) x 6.023 x 10^(24) moles = 10 moles. Since 1 mole = 4 grams(approx.) we can easily say 10 moles of helium will have a mass of 40 grams(approx.). Explanation: |
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| 3. |
Write the molecular formula of the compsounds of the following elements with hydrigens by referring to mendeleeves periodic table c s br as f o n cl |
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Answer» Answer: BbbuininnsjonThe conductivity of a solution is directly proportional to NUMBER of ions present in a unit volume of the solut CURRENT is carried FORWARD by the ions. With dilution number of ions in unit volume decreases so that conductivity also decreases. Hence with dilution conductivity decreases. Explanation: |
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| 4. |
Alpaca namein some other languages |
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Answer» Answer: → AFRIKAANS: alpakka. → ARABIC: أَلْبَكَة (ʾalbaka) → Armenian: ալպակա (ALPAKA) → Belarusian: альпака (alʹpaka) → Catalan: alpaca. → Czech: alpaka. → Danish: alpaka. → Dutch: alpaca Explanation: |
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| 5. |
What is the price of dinesh class 9 chemistry |
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Answer» Answer: |
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| 6. |
Ch3br +AgcN goes to What will be the products of thus reactants |
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Answer» there will be formation of METHYL isocyanide + silver bromide Explanation: since silver CYANIDE has covalent bond so nitrogen LONE pairs will attack on CH3 so there will be formation of methyl isocyanide |
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| 7. |
Na (11) Cl (17) which atom is largest in size and why ? |
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Answer» Answer: sodium Explanation: since across the period NUCLEAR charge increases the ATOM size DECREASES |
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| 8. |
What is the source of heat and light of the Sun |
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Answer» The core of the sun is so hot and there is so MUCH pressure, nuclear fusion takes PLACE: hydrogen is CHANGED to helium. Nuclear fusion creates HEAT and photons (light). The sun's surface is about 6,000 KELVIN, which is 10,340 degrees Fahrenheit (5,726 degrees Celsius). |
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| 9. |
Carbon can reduce lead ocide but not alluminium oxide |
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Answer» Answer: Because The oxidase numbers of carbon are more than aluminum, so carbon leads to carbon but the oxidase NUMBER of aluminum is LESS than carbon Therefore, lead OXIDE is not released immediately. Explanation: |
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| 10. |
Please help with Chemistry is questions(test)! I hope you will help!1. Type of hybridization of the carbon atoms in alkanes:2. Which hydrocarbons has a high boiling point:A) straight chain hydrocarbonsB) Branched chain hydrocarbonsC) there are no correlations between structure and boiling points of hydrocarbons 3. Reforming is a process in which straight-chain alkanes are heated under pressure in the presence of a platinum catalyst to have branched-chain molecules.A) trueB) false4. The product of following dehydrohalogenation reaction is:CH3-CH2-CH2-CH2CI + KOH(alc) 5.What is the main product of hydrochlorination of the propylene (Markovnikov’s rule):CH3-CH=CH2 + HCI = CH3 CH(Cl)CH36. What is the main product of hydration of the propylene (Markovnikov’s rule):CH3-CH=CH2 + H2O = CH3CHOHCH3 7. Identify the incorrect statement regarding conjugated double bonds in alkadiene:a) 1,3 alkadienes have conjugated double bondb) Compounds with a double bond exhibit this type of bondc) 1,3 pentadiene is an example for this bondd) The conjugated dienes have properties similar to that of alkenes8. Conjugated diene reacts with which among the following to form a cyclohexenea) Phenolb) Dienophilec) Hexaned) Tribromo phenol9. A molecule in which more than one single bond separates two double bonds are called as:a) Coordinate bondb) Isolated double bondc) Cumulative double bondd) Conjugated double bond10. Isolated dienes are similar in property toa) Monoolefinsb) Diolefinsc) Triolefinsd) Tetraolefins |
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Answer» Answer: |
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| 11. |
An acid can react with.1.agcl,2.naco23,c.pbso4,d.naso24 |
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Answer» Answer: Explanation: A DILUTE ACID reacts with NA2CO3 as it is a basic salt. Its parent acid is carbonic acid and parent base is sodium hydroxide. The REACTION is a neutralization reaction. AgCl cannot react with acid because silver is less REACTIVE than hydrogen and is not able to displace it from dilute acids. |
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| 12. |
Do all substances catch fire on same temperature |
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Answer» Answer: No. When most materials catch fire, it is actually hot gases or vapors from the MATERIAL that are actually BURNING. Some SUBSTANCES must be HEATED to the point where they chemically break down to form gaseous byproducts (paper, WOOD). Please mark it as the brainliest... |
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| 13. |
The ratio of energy to frequency of electromagnetic radiation is called1 bohr’s constant 2 Rydberg’s constant 3 Planck’s constant 4 Ritz constant |
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| 14. |
A) What are the two types of matter?b) Briefly explain, how soil is considered as an impure substance?No spam plz dear give full and brainliest answerplzz |
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Answer» 1.Matter can be broken down into two categories: pure substances and mixtures. Pure substances are further broken down into ELEMENTS and compounds. Mixtures are physically combined structures that can be separated into their ORIGINAL components. A chemical SUBSTANCE is composed of one type of atom or molecule. 2.Soil is made up of a lot of different stuff, but you can break it down into two categories - organic material, and mineral material. ... This is the stuff that makes soil fertile - the nutrients that plants use. So, soil is far from a pure substance, and can vary QUITE a bit in composition, depending on geography. |
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| 15. |
Why does charcoal not produce flame |
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Answer» Charcoal is a solid fuel. This is the reason that it can't vaporious on HEATING. so that's why coal not burn by producing flame.. Coal or charcoal does not produce flame when burnt because it does not vapourizes, only those substances which vapourizes on burning produce flame LIKE wax , NATURAL gas. |
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| 16. |
Though heavy in mass ______ , in Mendeleev's periodic table , and the highest element is_______ , but ______ is smallest in size in all existing elements |
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| 17. |
Can someone answer the First question? And explain it too? |
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Answer» fkpuyumskuttskutaligsultalu5aluralu4alitwo8elitslitwlialigsliHhdkyGytwli5sli5d96dliyelu5WL75sl74wlutwyw8p6w8p55QP86wil5alitzjlttskuttqjqulurralu4rwmwluttailtqlittwp7q7l5q4lwj4wku5wwlugsluttwku44aukrqlu5qu4owouTsul4smgsutktskurq7i6q i don't KNOW |
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| 19. |
Three difference between ideal and non ideal |
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Answer» Answer: The solution is said to be an idealsolution, only when the intermolecular forces of attraction between A – A, B – B and A – B are nearly equal. ❄The solutions which don't obey RAOULT's law at EVERY RANGE of concentration and at all temperatures are called Non-IdealSolutions. |
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| 20. |
Electron gain enthalpy order of16 group elements |
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Answer» Answer: |
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| 21. |
REFUSE to sanction a project of his ministry for sound technical reason answer |
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Answer» It’s because I DIVED |
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| 22. |
When B2H6 reacts with excess ammonia at room temperature select correct about product |
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Answer» B3N3H6 Explanation: B2H6+2NH3=B2H6.2NH3 3B2H6.2NH3= 2B3N3H6 + 12H2 |
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| 23. |
Assignment on force of attraction among iron, rubber band and chalk |
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Answer» Answer: Rubber BAND becomes weak on stretching and MAY break. It has force of attraction between molecules INTERMEDIATE. Whereas on other hand chalk piece on hammering with RID easily gets powdered . Which proves it has least force of attraction. Explanation: |
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| 24. |
No . Of atoms of 0.1 mol of triatomic gas |
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Answer» EXPLANATION:NA = 6.02 X 10²³ mol⁻¹ |
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| 25. |
Which of the following is highly covalent?1) AlF32) AICI33) AIBr34) CCL4 |
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Answer» The Covalent nature of a compound is directly proportional to its polarization Polarization INCREASES as the size of the anions increases and decreases as the size of the cations increases Hence AlBr3 has the highest Covalent character The increasing order is 1<2<4<3 I HOPE this helps ( ╹▽╹ ) |
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| 26. |
What are industrial uses of metal ? |
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Answer» Explanation: Copper and aluminium metals are used to make wires to carry electric current. ... SODIUM, TITANIUM and zirconium metals are used in atomic energies and space science projects. Zinc is used for galvanising IRON to protect it from RUSTING. |
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| 27. |
An atom X that has 12 protons and 12 electrons, loses two electrons toform an ion.What will be charge of the ion? What will be the number ofprotons and electrons in the ion? |
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Answer» Explanation: The atom X is an atom of Magnesium. Magnesiu(Mg) has valency 2. The charge on the ion after losing two ions will be +2. The number of protons will be 12 and electron will be 10. |
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| 28. |
(a) Write the expression of Kc for the reaction.X¶ncn¡p¶ cmk{]hÀ¯\¯nsâ Kc FgpXpI. 4NH3(g) + 5O2 (g) 4NO(g) + 6H2O(g) (b) What happens to the value of Kc when the above reaction is reversed? ta¸dª cmk{]hÀ¯\w adpZnibn \S¶m Kc bpsS hnebv¡ v F´v amäw D−mIpw? |
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Answer» Answer: The CONDUCTIVITY of a solution is directly PROPORTIONAL to NUMBER of IONS present in a unit volume of the solution because current is carried forward by the ions. With dilution number of ions in unit volume DECREASES so that conductivity also decreases. Hence with dilution conductivity decreases. Explanation: |
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| 29. |
How is wool fiber obtained from the sheared wool |
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Answer» Answer: WOOL is obtained from this fleece. Shearing is the FIRST step in processingfibre into wool. It is the removal of the fleece of the sheep along with a thin LAYER of the skin. ... The longer fibresare made into wool for sweaters, while the shorter fibres are SPUN and woven into woollen cloth. Explanation: |
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| 32. |
Al and Ga have nearly the same covalent radii because of |
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Answer» Galium contain INNER 3d electrons which have poor sheilding EFFECT thus cannot hold NUCLEAR charge to itself and exert it on valence electron and there FORE the size of Ga decreases. {Sheilding effect is ability of holding the nuclear charge to itself.} |
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| 33. |
How to prepare 1bromobutane to hex1yne |
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Answer» Answer: 1-bromo BUTANE can be converted into hex-1-yne by treating it with sodium acetylide in NON POLAR solvents like ether. The hydrogen in acetylene is acidic so, acetylene when heated with sodium produces sodium acetylide Explanation: |
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| 34. |
What is Terrycot in simple words...don't copy from Google |
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Answer» Answer: Hii Your Answer is Terrycot is a fibre MADE from the mixture of two FIBRES:------ A. COTTON which is a natural plant fibre. Its scientific name is Gossypium spp. It has soft, fluffy staple fiber that grows in a boll, or protective casing on the plant. B. TERYLENE which is a polymer of 1. Ethylene Glycol 2. Terephthalic ACID. Terylene is a synthetic fibre used for making clothes. It is elastic, highly durable, wrinkle-free.The acid is benzene-1,4-dicarboxylic acid (old name: terephthalic acid). The alcohol is ethane-1,2-diol (old name: ethylene glycol). I HOPE It will Help U ❣️❣️ |
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| 35. |
Fill in the blanks 1)Gasses have ......... density,2)Nitric oxide is ........ toxic |
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Answer» Answer: 1....gases have lower DENSITY 2.... nitric oxide is COLOURLESS toxic |
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| 36. |
10g of H2 react with 64 g of O2 to yield H2O.a) Which is the limiting reagent?b) Calculate the maximum amount of H2O that can be formed.c) Calculate the amount of one of the reactant which remains unreacted. |
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Answer» Answer: Typically, PERCENT YIELDS are understandably less than 100% because of the reasons indicated EARLIER. However, percent yields greater than 100% are possible if the measured product of the reaction contains impurities that cause its mass to be greater than it actually WOULD be if the product was pure. |
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| 37. |
Find the number of molecular in 22.4 * 10^3 mL of CO2 gas at STP |
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Answer» Answer: 6×10^23 MOLECULES Explanation: SINCE since 22400 ml has AVOGADRO NUMBER of molecules (fact) then 22400 ml will be having avogadro the number of molecules |
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| 38. |
if mole fraction of water in aqueous solution of cacl2 is 0.9 what is the mass of solution???? ( molar mass of cacl2 is 111) |
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Answer» As per the FORMULA X1+X2= 1 Here X1 REPRESENTS MOLE fraction of solvent and X2 represents mole fraction of solute X1 =0.9 then X2=0.1 If mass of water is 100g and molar mass is 18 Moles 1=100/18=5.55 X1=moles 1/total moles Total moles = 5.55/0.9=6.17 X2= moles 2/ total moles Moles 2=0.1×6.17=0.617 Moles 2= weight /molar mass Weight=0.617×111=68.5g I hope this HELPS ( ╹▽╹ ) |
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| 39. |
Fe + H20 - Fe3O4 + H2 what this equation called name it |
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Answer» Explanation: Iron reacts with water in the form of steam to form iron oxide, along with the release of HYDROGEN. It DISPLACES hydrogen from water/steam, which is EVOLVED or released as a gas. IT IS A DISPLACEMENT REACTION
PLEASE MARKAS BRAINIST |
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| 40. |
Atomic radius is expressed in |
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Answer» Explanation: Units used to measure atomic radius: ANGSTROMS (Å): This the most common unit used. Equivalent to 1.0 x 10-10 METERS. Nanometer (nm): Equivalent to 1.0 x 10-9 meters. PLEASE MARK AS BRAINIST |
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| 41. |
Suppose we have 1 mol of rupee and we spend 10 lakhs per second . How amount will be lift of for 100 years? |
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Answer» Avogadro's NUMBER = 6.023 X 1023 If we spend Rs. 10,00,000 in 1 sec, then Rs. 6.023 x 1023 will be spent in (6.023 x 1023/ 10,00,000) = 6.023 x 1017sec.
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| 43. |
What is H.Landolt full name ? |
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Answer» Hans Heinrich Landolt (5 December 1831 – 15 MARCH 1910) was a Swiss chemist who discovered iodine clock reaction. He is also ONE of the founders of Landolt–Börnstein database. I HOPE THIS MAY HELP U.. #gundi.. follow me..✌✌ mark as brainlist.✌✌ |
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| 44. |
A)what are the two types of matter?b) What are mixture?No spam plz dear give full and brainliest answerplzz |
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Answer» Answer: Explanation: Matter can be classified under 2 types, matter that is a pure substance and matter that is a mixture of more than one pure substance. ... There are five known phases, or states, of matter: solids, liquids, GASES, PLASMA and Bose-Einstein condensates. There are 2 types of mixtures mainly HETEROGENEOUS and HOMOGENEOUS mixtures…! HOMOGENEOUS MIXTURES are the mixtures which have the same composition THROUGHOUT and are also called SOLUTIONS. eg:- sugar solution, salt solution, etc. |
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| 45. |
PLZ ANSWER THESE QUESTION DONT GOOGLE THIS I TRIED IT |
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Answer» Answer: a. No , because they can be harmful b. colour , olfactory indicators c. |
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| 46. |
What is speed and velocity ...Do not copy from Google |
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Answer» Your ANSWER is here SPEED
SPEED is defined as the DISTANCE travelled by an object per unit time VELOCITYVELOCITY The VELOCITY of an object is the displacement of the object in a short interval DIVIDED by the time interval. Hope it will HELP you |
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| 47. |
Which compound breaks to form carbon dioxide |
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Answer» Answer: CACO3 i.e. calcium CARBONATE breaks to form carbon DIOXIDE and calcium OXIDE. |
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| 48. |
How hydration energy of group-13 elements changes down the group? |
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Answer» Answer: HYDRATION intensity depends on the charge density of a species. So, AMONG two ions with same charge, the ONE with a smaller radius will have more hydration energy. Generally in groups where size trend is even and size INCREASES down the group (S block), hydration energy decreases down the group. |
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| 49. |
Write the chemical names of the following compounds |
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Answer» Where is compound PLEASE send FULL QUESTION and proper QUESTIONS |
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| 50. |
Define matter and write its two properties |
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