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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.
| 4151. |
Why does an aqueous solution of an avid conduct electricity |
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Answer» because it has H+ ions Explanation: |
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| 4152. |
At hundred degree Celsius the vapour pressure of solution is 722 mmhg if KB is 0.52 the boiling point of solution is |
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Answer» Answer: solution is 101.1076 CELSIUS |
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| 4153. |
A current of 2.0 A passed for 5hrs through a molten metal salt deposits 22.2g of metals the oxidation state of the metal in metal salt is |
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Answer» Answer: hope the answer will help you Explanation: MARK the answer BRAINLIESTS PLEASE |
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| 4154. |
Give unit of ionization enthalpy value |
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Answer» In physics and chemistry, ionization energy (American English spelling) or ionisation energy (British English spelling), denoted Ei, is the minimum amount of energy required to remove the most loosely bound electron, the valence electron, of an isolated neutral gaseous atom or molecule. It is QUANTITATIVELY expressed as In physics and chemistry, ionization energy (American English spelling) or ionisation energy (British English spelling), denoted Ei, is the minimum amount of energy required to remove the most loosely bound electron, the valence electron, of an isolated neutral gaseous atom or molecule. It is quantitatively expressed asX(g) + energy → X+(g) + e− In physics and chemistry, ionization energy (American English spelling) or ionisation energy (British English spelling), denoted Ei, is the minimum amount of energy required to remove the most loosely bound electron, the valence electron, of an isolated neutral gaseous atom or molecule. It is quantitatively expressed asX(g) + energy → X+(g) + e−where X is any atom or molecule capable of ionization, X+ is that atom or molecule with an electron removed, and e− is the removed electron.[1] This is generally an endothermic PROCESS. Generally, the closer the outermost ELECTRONS to the nucleus of the atom , the higher the atom's or element's ionization energy. In physics and chemistry, ionization energy (American English spelling) or ionisation energy (British English spelling), denoted Ei, is the minimum amount of energy required to remove the most loosely bound electron, the valence electron, of an isolated neutral gaseous atom or molecule. It is quantitatively expressed asX(g) + energy → X+(g) + e−where X is any atom or molecule capable of ionization, X+ is that atom or molecule with an electron removed, and e− is the removed electron.[1] This is generally an endothermic process. Generally, the closer the outermost electrons to the nucleus of the atom , the higher the atom's or element's ionization energy.The sciences of physics and chemistry use different measures of ionization energy. In physics, the unit is the amount of energy required to remove a single electron from a single atom or molecule, expressed as electronvolts. In chemistry, the unit is the amount of energy required for all of the atoms in a mole of SUBSTANCE to lose one electron each: molar ionization energy or enthalpy, expressed as kilojoules per mole (kJ/mol) or kilocalories per mole (kcal/mol).[2] In physics and chemistry, ionization energy (American English spelling) or ionisation energy (British English spelling), denoted Ei, is the minimum amount of energy required to remove the most loosely bound electron, the valence electron, of an isolated neutral gaseous atom or molecule. It is quantitatively expressed asX(g) + energy → X+(g) + e−where X is any atom or molecule capable of ionization, X+ is that atom or molecule with an electron removed, and e− is the removed electron.[1] This is generally an endothermic process. Generally, the closer the outermost electrons to the nucleus of the atom , the higher the atom's or element's ionization energy.The sciences of physics and chemistry use different measures of ionization energy. In physics, the unit is the amount of energy required to remove a single electron from a single atom or molecule, expressed as electronvolts. In chemistry, the unit is the amount of energy required for all of the atoms in a mole of substance to lose one electron each: molar ionization energy or enthalpy, expressed as kilojoules per mole (kJ/mol) or kilocalories per mole (kcal/mol).[2]Comparison of Ei of elements in the periodic table reveals two periodic trends: |
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| 4155. |
Select the correct atom inventory for the reacants side.Al + O2 ® Al2O3 aAl 1, O 1bAl 1, O 2cAl 2, O 3dAl 1, O 3 and the secondone is Select the correct atom inventory for the products side.Al + O2 ® Al2O3 aAl 1, O 2bAl 1, O 3cAl 2, O 3dAl 2, O 2 |
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| 4156. |
1 mole of nitrogen gas at 0.8atm takes 38 sec to diffuse through pin hole whereas 1 mole unknown binary compounds of xenon with fluoride at 1.6 atm takes 57 sec to diffuse through the same hole.calculate molecular formula .Atmoic weight of xe is 136 unit...(please show whole process) |
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Answer» Answer: ANSWER r XeF
r N
= P XeF n
P N 2
M N 2
M XeF n
r XeF n
r N 2
= t XeF n
Molar VOLUME
t N 2
Molar volume
= t N 2
t XeF n
= 38 57
∴ 38 57
= 1.6 0.8
28 M XeF n
M XeF n
=( 38 57
) 2 ×( 0.8 1.6
) 2 ×28 =252 Xe+nF=252 131+n×19=252 n=6 Molecular FORMULA =XeF .
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| 4157. |
Define mutual coagulation? |
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Answer» Answer: Mutual coagulation is the destabilisation if colloids by NEUTRALIZING the electric CHARGE of the dispersed PHASE particles which RESULT in aggregation of the colloidal particles. Hope it helps ✌️✌️ |
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| 4158. |
Why it is nessary to rinse the pipette after washing with water? |
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Answer» Answer:When you're cleaning your glassware, you use water to rinse it off. If the burette is not completely DRY by the TIME you use it, the remaining TRACES of water on the inside will make your titrant more dilute and THEREBY change its concentration. Explanation: |
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| 4159. |
Equivalent weight of base NH4 OH |
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Answer» Answer: 17 Explanation: on NET from phonejsjjs |
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| 4160. |
Ii) Applying IUPAC rules, derive the structural formula of the following compounds.a) Pentanoic acid(b)2-methly-butan-2-ol |
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Answer» a) CH3CH2CH2CH2COOH |
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| 4161. |
14 un27. The states of hybridization of boron and oxygen atoms inboric acid (H,BO,) are respectively(a) sp3 and sp2(b) sp2 and sp3(c) sp 2and sp2(d) sp3 and sp328. In which of the following molecules/ions are all the bonds notequal?(a) XeF4 (b) BF4＾-(C) SF4 (d) SiF4 |
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Answer» c) SF4 ........................ |
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| 4162. |
Calculate the boby temperature of a healthy human beings in kelvin |
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Answer» Answer: 310 Kelvin Explanation: HOPE it is helpful |
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| 4163. |
For ideal soution chemical potential is less than standard chemical potential or not? |
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Answer» NO IDEAL SOLUTION CHEMICL potential is less HOPE IT HELPS MARK ME BRAINLIEST |
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| 4164. |
27. The states of hybridization of boron and oxygen atoms inboric acid (H,BO,) are respectively(a) sp and sp(b) sp' and sp(c) sp and sp(d) sp and sp28. In which of the following molecules/ions are all the bonds notequal?(a) Xef (6) BF (C) SF (d) Sif |
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Answer» Hey MATE here is ur ANSWER ;:: ➡Hybridisation of Boron in Boric ACID is SP3 Hope it helps U dear ☺❤ |
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| 4165. |
What is the freezing point in celcius of a 0.321 m aqueous solution of NaCI |
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| 4166. |
How can you stabilize a sodium ion. give reason |
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Answer» SODIUM ION can be STABILIZED by reacting IY with some other ELEMENTS |
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| 4167. |
What is glycogen? how is it different from starch? |
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Answer» Explanation: glycogen is form of carbohydrate STORED in animals BODY it is higly branched STRUCTURE |
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| 4168. |
the amount of heat energy that is needed to change the state of matter in the form of hidden heat is called________ |
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| 4169. |
Mass of one atom of Oxygen is1. 16 g/6.023*10 power 23 II 32 gram 6.023 into 10 ki power 23 third 1 gram 6.023 into 10 ki power 23 forth 8u |
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| 4170. |
Explain with suitable phenol is more acidic than cycloheranol |
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Answer» Answer: phenol is more ACIDIC than CYCLOHEXANOL because Explanation: because the phenoxide ion is more STABLE than alkoxide ion. In an alkoxide ion such as the one derived from cyclohexanol the negative charge is located at the OXYGEN atom |
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| 4171. |
Why does iron nail become brownish in colour and blue colour of copper sulphate solution fade |
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Answer» ANSWER:because of FORMATION of FeSO4 Explanation: |
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| 4172. |
What volume of carbon dioxide is liberated at stp by heating 4grams of caco3 |
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Answer» ACCORDING to RXN - CaCO3 GIVES CaO + CO2 100 gram CaCO3 gives 22.4 litre of CO2 so its 4gram will give 0 .896 litre of CO2 Explanation: |
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| 4173. |
In newspaper which type of poisonous ink is present |
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Answer» in newspaper 2- naphthylamine and 4- AMINOBIPHENYL poisonous INK is present Explanation: it causes cancer to the worker while printing the newspaper. |
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| 4174. |
त्रिविमवरणात्मक अभिक्रिया |
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Answer» हृदयनाथांच्या हृषीकेश चढवलेल्या रहस्यच चढवली आश्रम नमस्कार आहे हे
MARK me BRAINLIEST !!! |
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| 4175. |
Find the number of electrons chromium 3 + ion |
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Answer» hiiiiiiiiiiiiiiiiiiiiiiiiiiiii |
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| 4176. |
At a constant temperature, dissociation of 0.01 M CH3COOH solution is 4% . Calculate the dissociation constants of acetic acidWith full explanation: |
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Answer» Answer: hope the answer will HELP you MARK the answer BRAINLIESTS please |
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| 4177. |
Calculate bond order of the molecule O2- |
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Answer» its bond order is 1 Explanation: MARK the answer BRAINLIESTS please |
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| 4178. |
Why do minerals essential for living things |
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Answer» Answer: Here is your answer, One of the key TASKS of MAJOR minerals is to maintain the PROPER balance of water in the body. Sodium, CHLORIDE, and potassium take the lead in doing this. Three other major minerals—calcium, phosphorus, and magnesium—are important for healthy bones. Thank you Sincerely..... |
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| 4179. |
A) Why do minerals essential for living things. |
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Answer» Explanation: They regulate the building of tissues and cells, they HELP in METABOLISM, and they promote healing and prevent diseases. They allow the details of the body to GET DONE. Vitamins are made up of the same chemicals as carbohydrates, PROTEINS, and fats, but they do not need to be broken down to be used. this may help u...byy.. |
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| 4180. |
19. In a redox reaction which of the following activities takes placea) Only Removal of hydrogen (b) Only addition of oxygen, (c) Both addition of oxygen andremoval of oxygen, (d) Both removal of oxygen and addition of oxygen |
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| 4181. |
Calculate the mole fraction of benzene in solution containing 30% by mass in carton tetrachloride, |
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Answer» I don't KNOW the answer. |
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| 4182. |
18. Aluminium Oxide reacts with sulphuric acid to form:a) Aluminium Sulphate and water, (b) Aluminium Sulphate and Hydrogen(c) Aluminium Sulphate and Oxygen, (d) Aluminium Sulphate and sulphur dioxide |
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| 4183. |
Which property of a liquid is used when petrol pump form the tank to the engine of a car |
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Answer» COMPRESSED property Explanation: |
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| 4184. |
Prepare ethane from bromo ethane |
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Answer» Answer: Explanation: BromoEthane (CH3CH2Br) -----> Ethane (CH3CH3) Add HBr into the SOLUTION to Gain H+ and BR- . Br- will attack on CH2Br bond as it is ELECTRON rich. After breaking of the bond we get Br+ and CH3CH2–. Because H+Br- is still present in the medium it reacts with newly FORMED cations and anions giving : BR2 and CH3CH3 . (As CH3CH2– has a negative charge and HBr on breaking gives H+ and Br- . Also Br- and Br+ combine to become Br2) Hence The Reaction. |
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| 4186. |
An example of exothermic reaction which 'is not' a combination reactionAnswer correct to get marked brainiest |
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Answer» We can say that most of the combination REACTIONS are exothermic, but each and EVERY combination reaction will not be exothermic. For example, the UNCATALYSED synthesis of NO from N2 and O2 is endothermic. SIMILARLY, most of the DECOMPOSITION reactions are endothermic. |
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| 4187. |
H, (s) + Cl2lg → 2010- 4+1+4 -1+1 -1CH4(g) + 4C12(g) → CC14(1) +4HCl(g) whythis happened |
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Answer» Answer: |
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| 4188. |
What we say to chemistry in arab countries ??????? |
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Answer» HEY MATE here's your answer...
Hope this helps you.... Plz mark as brainliest... ❤️ Yours SINCERELY Jalay |
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| 4189. |
Why mercury does not exist in solid state under room temperature? |
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Answer» Answer: Mercury can be solidified when its TEMPERATURE is brought to its freezing point. However, when RETURNED to room temperature conditions, mercury does not exist in solid STATE for long, and RETURNS back to its more common liquid form Explanation: |
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| 4190. |
74.The root mean square velocity of hydrogen isV5 times than that of nitrogen. If I is thetemperature of the gas, then |
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Answer» MASS of N2/mass of H2=25 . |
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| 4191. |
What is rust? How can you iron from rusting? |
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Answer» Answer: RUST is a BROWN POWDERY structure which forms over the piece of iron due to the contact with moisture and Oxygen. |
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| 4192. |
Methods to putting a layer of non corrodible metal on a corrodible metal |
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Answer» Methods of PUTTING a layer of NON corrodible metal on a corrodible metal is KNOWN as galvanizing. ... SIMILARLY, there is an electroplating process where a PROTECTIVE layer of metal is applied (mostly zinc) on any kind of normal metal substance. This electroplating process is popularly known as the galvanization process. This is your answer please mark as brainliest plzzzzzzzzzzzzzzzzzzzzzzzz |
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| 4193. |
When water is frozen in glass bottles,it is advised not to fill the bottle completely.explain the reason. |
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Answer» Answer: Water expands when it freezes. If you FILL a bottle with water, you leave some room at the TOP so the ice has somewhere to go. If you fill the bottle all the way, it'll burst because the ice has NOWHERE to go. Well, EITHER that or it'll overflow if you happen to leave the bottle UNSEALED. |
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| 4194. |
17. When a green coloured crystals of compound X is heated for long time a brown colouredcompound is formed along with a pungent smell of sulphur. The compound X isa) Copper sulphate, (b) Iron sulphate, (c) Lead nitrate, (d) Aluminium sulphate |
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Answer» awykwyk2yl3o2of oel3of wm2P GPL peul37of p3ulsyo3o36oskeyo3yagk266o26oagkwyo6owykyo2owkwykwyi26iwyk26o ogk2o |
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| 4195. |
What is decomposition reaction |
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Answer» Hey MATE here's your answer... Explanation:
Hope this HELPS you.... Plz MARK as brainliest... ❤️ Yours sincerely Jalay |
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| 4196. |
In a certain reaction 2a+b =4c .the concentration of a decrease from 5×20^3mole per litre in 30seconds to 2×10^3 what is the rate of reaction with respect? |
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Answer» iska answer theta LAMBDA by theta HOGA PLEASE ACCEPT my answer |
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| 4197. |
2.IllustrationsElements A and B combine to form three dillererg of compound X, 18.0 g of A + 48.0 g of B159.99 g of B -----> 199.99 g of compound 2. Show that the dataproportions.Let us fix the weight ofn.noching with 1 noin thepounds : 0.39 A+ 0.4 g of B > 0.7> 66.0 g of compound Y, 40.0 g of A+mpound Z. Show that the data illustrate the law of multiple |
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Answer» JAB hogi tab bulana jarur |
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| 4198. |
What are the factors of water pollution? |
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Answer» Answer: INDUSTRIAL EFFLUENTS, sewage in the river, domestic waste THROWN in the water BODIES, ETC. |
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| 4199. |
Say some tips for corona virus...... |
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Answer» Answer: TIPS AND PREVENTIVE MEASURES FOR THE NOVEL CORONAVIRUS 1. Wash your hands THOROUGHLY with soap after touching contaminated surfaces or in the worst case use sanitizers for the same. 2. If you are infected wear a mask to PREVENT making other people sick. We can also wear masks for prevention. 3. Avoid touching you face especially your eyes, mouth and nose as the VIRUS needs a liquid MEDIUM to travel. 4. Avoid attending gatherings or trips to affected countries. Last but not the least, stop spreading fake news. We should unite and fight as one to make this pandemic long GONE.... If you like the answer please mark it as the Brainliest |
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| 4200. |
When the zinc layer on iron is removed,will iron rust or it still protected from corrosion???thx in advance |
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Answer» hey mate, ur ans is yes, it will rust when it will COME in contact with O2 and h20 hope it helps.. pls MARK me as branliest....❤✌ |
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