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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.
| 301. |
2. How did mal mendelee use the mouleurperiodic table of elemento? |
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Answer» Thus, Mendeleev LEFT gaps for GALLIUM and germanium. He named these elements as eka-aluminium and eka-silicon. When these elements were DISCOVERED, their properties were similar to those predicted by Mendeleev. Explanation: hope it helps you please mark me as brainlist |
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| 302. |
How is petroleum gas brought to liquid state?(in terms of change in state of matter)? thank you! |
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Answer» Answer: It is extracted from crude oil and natural gas. ... Normally, the gas is stored in liquid form under pressure in a steel CONTAINER, cylinder or tank. The pressure inside the container will depend on the TYPE of LPG (COMMERCIAL BUTANE or commercial propane) and the outside temperature. |
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| 303. |
Classify the reactions according to their types Combination , Decomposition , Single Displacement , or Double Displacement reaction1. CH4 + 202 = CO2 + 2H202. 2 Na +2H20 - 2NaOH + H23. Fets = FeS4. 2KC10g =2k CI+ 3025. CuCoz - CuO + CO26. Fet CuSO4 = Fe sou tu7. N₂ + 3H₂ = 2NH₂2. Ha+ , SO4, 4S, Ha9. Na Cl + AgNO3 = Ag Cl+Na NO310.2Mg + O2 = 2MgO + HeatPLEASE ANSWER CORRECTLY |
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| 304. |
Classify the following into physical and chemical change :• burning of paper• photosynthesis • breaking of Glass tumbler• sublimation of camphor • curdling of milk• digestion • cooking of food • conversion of liquid water into water vapours • rotting of eggs• ripening of fruit• decay of leafPLS ANSWER FAST, DON'T SPAMIT'S URGENT... |
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Answer» ANSWER : CHEMICAL CHANGE :
PHYSICAL CHANGE:
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| 305. |
Given that the mean relative atomic mass of chlorine contains two isotopes of mass number 35 and 36,what is the percentage composition of the isotope of mass number 37 |
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Answer» EV tehddddffddsxdddeeseeeee |
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| 306. |
Substances which emit harmful radiation |
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Answer» Explanation: Unstable forms emit IONIZING radiation and are RADIOACTIVE. There are some elements with no STABLE FORM that are always radioactive, such as URANIUM. Elements that emit ionizing radiation are called radionuclides. |
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| 307. |
Classify the acid based on its origin, strength and level of water. |
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Answer»
What are Acids?  Acids are a molecule or other species which can donate a proton or accept an electron pair in reactions. The word “acid” is derived from the Latin word “acidus” which means sour. All acid elements have a few things in common i.e all are sour in taste, they turn blue litmus paper to red, and lose their acidity if they’re combined with alkaline substances. The pH level of acids ranges from 0 – 6. Some common examples of acids are Citrus fruits such as lemons, limes, oranges, grapefruit, etc. All these fruits contain citric acid. Hence, they taste sour or tart. Citric acid is a weak acid but still, it produces hydrogen ions when mixed with water and that’s why the pH of LEMON juice is 2. Another example of an acid is VINEGAR. Vinegar consists of acetic acid. Ever wondered why your skin becomes red and SWOLLEN after an ant bite or a mosquito bite? Because these insects inject formic acid which causes such skin reactions. Nitric acid, sulfuric acid, hydrochloric acid, etc. are other common ones. Properties of Acids The properties of Acids are as FOLLOWS; Acids change the color of blue litmus to red They change the color of Methyl Orange/Yellow to Pink Acidic substances CONVERTS Phenolphthalein from deep pink to colorless Are sour or tart in taste The pH level of acids range from 0-6 Acids lose their acidity when combined with alkalines They destroy the chemical property of bases When reacting with metals they produce hydrogen gas Acids produce carbon dioxide when reacted with carbonates. Most acids are corrosive in nature which means that they tend to corrode or rust metals.
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| 308. |
Who is the magician of hockey |
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Answer» MAJOR dhayan chandr Explanation: |
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| 309. |
[freezing/ condensation). The constant temperature at which ice changes into 'Xis7. Ice on absorption of heat converts to 'X' a process called6. Intermingling of molecules is called[vaporization / melting).'X' changes to water vapour on[heating/cooling). Water vapour changes back to 'X' oncalled its[fusion point / melting point / boiling point).fa substance.110 |
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| 310. |
How much water will be required to prepare 20% aqueous salt solution by adding 10 g of commonsalt? |
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Answer» Because the solution will CONTAIN 10g salt , it is necessary to add: 100g solution - 10gsalt = 90g water. Explanation: ✌️please MARK as BRAINLIEST answer✌️ |
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| 311. |
Isme 6Ef formula kyu lagaya sirf ye batao |
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Answer» Answer................. |
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| 312. |
An item was sold for Rs.450 at a loss of 10%.Its cost price isA)Rs.405B)Rs.500C)Rs.460 |
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Answer» Answer: B 500 Explanation: loss = 10 % sold % age = 90% selling price = 450 = 90% so 100 % = ? 100/90× 450 => 500 RS |
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| 313. |
An element belongs to group 17. It is present in third period and its atomic number is 17. What is the atomic number of the element belonging to same group and present in fifth period |
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Answer» Answer: Hence, the element in the 17TH GROUP of the third period has atomic number Z = 17 ,chlorine(CL) with atomic mass 35.453, which is a p BLOCK element. |
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| 314. |
Why bond angle are different in NH3 and PH3...Plz don't spam |
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Answer» Explanation: The bond pair in NH3 is close to N in N-H bond than the bond pair in P-H bond in PH3 . This is because the size of the nitrogen is small than phosphorus . As a result , the force of REPULSION between the bonded pair of electrons in PH3 is more than in NH3 . Therefore the bond angle in PH3 MOLECULE lesser than in NH3 |
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| 315. |
Assertion (A): Duralumin and Magnalium are used for making aircaft frames,Reason (R):They are very light and almost as tough as steel.a) Both A and R are correct and R is the correct explanation of A.b) Both A and R are correct and R is not the correct explanation of A.c) A is correct but R is incorrect.d) A is incorrect but R is correct. |
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Answer» OPTION a) because the both A and R are are CORRECT and R is the correct EXPLANATION of A |
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| 316. |
1. wool is obtained from |
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Answer» i HOPE UNDERSTAND for u bye frnd |
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| 317. |
A Compound of metal Y is used as baking soda . Identify Y .(short answer30words) |
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Answer» Explanation: The METAL is sodium. PLEASE MARK as Brainliest ANSWER. Please follow me. |
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| 320. |
Ibrahim lodi was the last sultan (a)true (b) false |
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Answer» Ibrahim Lodi ( r . 1517–1526), the YOUNGEST son of Sikandar, was the last Lodi Sultan of Delhi. ... Ibrahim was defeated in 1526 at the Battle of Panipat. This MARKED the end of the Lodi Dynasty and the RISE of the Mughal Empire in India led by Babur ( r . |
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| 321. |
A salt whose solubility shows a sharp break at 36 degrees celcius |
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Answer» here the answer MATE this salt is : Cesium (II) SULPHATE.... |
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| 322. |
Q9) State whether the following are physical or chemical properties: i) Magnesium reacts with hydrochloric acid ii) Hydrogen sulphide gas has a strong rotten egg odour iii) Manganese dioxide is black in colour iv) The melting point of ice is 0°C |
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Answer» i) CHEMICAL property ii) Chemical property iii) PHYSICAL property iv) Physical property Please MARK me BRAINLIEST ❤️ Dear Friend Explanation: |
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| 323. |
A mixture contain more than__substancemixed in ___ porportion |
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Answer» A mixture contain more than two SUBSTANCES MIXED in an INDEFINITE proportion. Explanation: hope it will help you |
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| 324. |
Ask me 10 question about chemistry atomic structure. Class 8 |
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Answer» Ok dear.! well I'm also in class 8✌ Ur Questions.!1 .WRITE the dot structure for Nacl. 2. What do u MEAN by MASS number? 3. What do u mean by atomic number.? 4. Write the electronic CONFIGURATION of Oxygen. 5 .Write the observation of the ruddleford GOLD scattering experiment . 6..Who discovered neutron? 7.who discovered cathode rays? 8..write how is an anion formed ? 9..Why is an atom electrically neutral? 10..What are isotopes? |
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| 325. |
What is a hetero nuclear diatomic molecule mean? |
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Answer» Answer: Diatomic molecules with two different ATOMS are called heteronuclear diatomic molecules. When two nonidentical atoms INTERACT to form a chemical bond, the interacting atomic orbitals do not have the same energy. ... In this way, molecular ORBITAL theory can describe a polar covalent bond. Explanation: Please mark me as BRAINLIEST |
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| 327. |
Define gamma globulin in brief . Don't copy from Google |
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Answer» Answer: A sterile solution of gamma globulin from pooled human blood administered ESPECIALLY for passive immunity against MEASLES, German measles, infectious hepatitis, or polio. HEY NVM BUT U COULD EVEN REFER GOOGLE |
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| 328. |
Na, co, + 2HCI-2 Naci + CO, H,0According to the above reaction, how many grams of Na,Co, will be needed to obtain 11.2 litre CO,?[Raj.NTSE Stage-1/06](A) 51(B) 53(C) 83(D) 106 answer with explanation |
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| 329. |
A losOPTIVE Type Questions|1 Mark1. If the size of particles dispersed in solution is inthe range 50 Å-2000 Å, then solution is(a) suspension(b) true solution(c) colloidal solution (d) saturated solution |
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Answer» A suspension Explanation: please MARK me as brainliest |
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| 330. |
Name three chemical preservativesWhy are they used? |
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Answer» Answer: sodium benzoate, sodium nitrite and sulphur DIOXIDE are the three common preservatives. Explanation: |
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| 331. |
Pb has fee structure with edge lengthof unit cell 405 pm. Radius of Pbatom isa. 205 pmb. 185 pmc. 260 pmd. 175 pm |
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Answer» Answer: 175 please MARK me as BRAINLIEST |
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| 332. |
On the basis of kinetic theory explain why ammonium chloride sublimes and goes from solid state to liquid state |
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Answer» idk |
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| 333. |
Burning of substance in air mean |
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Answer» When substances BURN in air they combine with OXYGEN in a combustion reaction to form oxide compounds. ... They are the fire TRIANGLE of fuel, heat and oxygen. If there is a LIMITED amount of air/oxygen, the burning can only be sustained for a limited time. The more oxygen AVAILABLE, the longer the substance can burn. I hope it's helpful for you.. . . ♪＼(*＾▽＾*)／＼(*＾▽＾*)／ |
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| 334. |
Correct answer will be marked as brainliest |
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Answer» Explanation: 5/85 = oh- LOG on both sides And MULTIPLY by -1 Poh=-log5/85 Poh=log 85/5 Poh = log 17 Poh = 1+log 1.7 Poh=1.21 Ph=12.79 |
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| 335. |
What is the principle of sublimation? example- is it based on size, weight...etc. |
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Answer» Answer: Sublimation is a process in which a solid turns DIRECTLY into gas without passing into liquid state. It works on the principle that solids have a weak INTERMOLECULAR force hence a HIGHER vapour PRESSURE which converts it into directly vapour state.ʜᴏᴘᴇ ɪᴛ ʜᴇʟᴘsғᴏʟʟᴏᴡ ᴍᴇ |
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| 336. |
Why does a small quantity of chlorine fill the whole vessel in which it is enclosed |
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Answer» Answer: it will help u dear Explanation: It is so because the particles of chlorine SETTLES down COMPLETELY and occupies space and MOLECULES are free to MOVE |
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| 337. |
What do you mean by the term Calorific value of a fuel? State its units. |
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Answer» Answer: calorific VALUE (plural calorific VALUES) The amount of ENERGY produced by the complete combustion of a MATERIAL or FUEL. Measured in units of energy per amount of material, e.g. kJ/kg. |
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| 338. |
A person has to make a non-stick pan.He has three types if plastic bakelite,teflon andPVC . Which plastic will he use for coating and why? |
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Answer» hope it's HELP you ❣️❣️........... |
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| 339. |
A person has to make a non-stick pan.He has three types of plastic bakelite,Teflon and PVC.Which plastic will he use for coating and why? |
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Answer» Answer: Explanation: He will use teflon as it MAKES a NON stick coating to an OBJECT on which it is applied consider making me brainliest peace ✌✌✌✌ |
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| 340. |
In the beautiful Himalayas, lived a girl called Gaura |
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Answer» yes it's true Explanation: please MAKE me briliant |
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| 341. |
What is the difference between heavy water and ordinary water? Draw the structure to support your answer. |
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Answer» Answer: In ordinary water, each hydrogen atom has just a single proton in its NUCLEUS. In HEAVY water, each hydrogen atom is indeed HEAVIER, with a neutron as well as a proton in its nucleus.... |
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| 342. |
Hey guys what to do when i ball tabs battery gets seased in lockdown please tell i am in trouble |
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Answer» seased? what does that MEAN? |
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| 343. |
Gases are separated from each other by:1)fractional evaporation2)distillation3)crystallization4)fractional purification |
Answer» ✏ gαsєs αrє sєραrατє∂ ƒrσм єαcн στнєr вy:1)ƒrαcτiσทαℓ єvαρσrατiσท2)∂isτiℓℓατiσท3)crysταℓℓiʑατiσท4)ƒrαcτiσทαℓ ρυriƒicατiσท✏ 1)ƒrαcτiσทαℓ єvαρσrατiσท ✏єxρℓαทατiσทgαsєs cαท вє sєραrατє∂ вy ƒrαcτiσทαℓ ∂isτiℓℓατiσท. ƒirsτℓy, τнє мixτυrє is cσσℓє∂ υทτiℓ iτ ƒσrмs α ℓiqυi∂. τнis is ƒσℓℓσωє∂ вy нєατiทg iτ. τнє gαs ωiτн ℓσωєr вσiℓiทg ρσiทτ risєs iท τнє ∂isτiℓℓατiσท cσℓυмท & is τнυs sєραrατє∂. |
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| 344. |
An iron becomes stronger after rusting(True / False) |
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Answer» no Explanation: not at all |
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| 345. |
Browning of vegetables is due to the reaction between certain compounds present in the vegetables and ______________. |
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Answer» Answer: in ATMOSPHERE is the RIGHT ans hope that it was helpful for you |
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| 346. |
Calculate no of electrons in 1.6 g of methane |
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Answer» 1mole of methane (16 grams) CONTAINS Avogadro NUMBER of MOLECULES. 0.1moles of methane( 1.6grams) contains '0.1 x Avogadro number' of molecules. Thus 0.1 mole of CH₄ contains "10 x 0.1 x Avogadro number" of electrons. THEREFORE 1.6 grams of methane contains 6.022 x 10²³ electrons. |
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| 347. |
Which is more concentrated? 20g of an alkali in 50ml of solution or 10g of the same alkali in 500ml of solution. Show your working. |
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Answer» CONCENTRATION of alkali in 250 ml in PERCENTAGE :- Concentration of alkali in 500ml in percentage :- |
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| 348. |
How can we separate a mixture of NaCl sulphur and sand class 9 |
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Answer» Answer: Sulphur dissolves in carbon disulphide but SAND is insoluble in carbon disulphide. Filter the SOLUTION and evaporate it to get sulphur. Sand is dried on filter paper. Collect the residue (Sand and Sulphur POWDER)and dissolve it in carbon disulphide, CS2. |
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| 349. |
An alloy cannot be separated into its components by physical method but still it is considered as a mixture? why ?aishi2020 i will be your friend❣❣hey muskan didi(muskmesh04) i get know about you that you are in 11th class i m in 9th class , can i call u didi or should i call u friend❤❤answer my question of alloy please...... |
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Answer» Answer: Though alloys are homogeneous MIXTURES which cannot be separated by PHYSICAL methods but they are considered to be a mixture because they are constituted by more than one KIND of pure form of MATTER. Moreover, they have an UNIFORM proportion throughout the matter. |
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| 350. |
tin oxide it is heated with hydrogen gas to get the metal and water vapour. write balanced chemical equation for the reaction |
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Answer» Explanation: For example, hydrogen gas (H2) can REACT (burn) with oxygen gas (O2) to FORM water (H20). The chemical equation for this REACTION is written as: The '+' is READ as 'reacts with' and the arrow '' means 'produces'. The chemical formulas on the left represent the starting substances, called reactants. |
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