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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.
| 3501. |
What is the molality of a saturated solution of DDT (C14H9Cl15) in CCl4, which contains 45 g of DDT per 100 mL of CCL ? The density of CCL4 is 1.6 g mol per L? |
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| 3502. |
Write steps involved in extraction of metals from ore |
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Answer» Steps INVOLVED are: The ORE ZNCO3 is first concentrated by gravity separation method. The ore is calcinated absence of it gets converted to oxide. The oxide is reduced by coke. ZnO + C → Zn + CO. The impure Zn THUS obtained can be purified by electrolysis. |
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| 3503. |
Which of metal displaces hydrogen gas from hydrochloric acid silver or zinc |
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Answer» Explanation: It is so because zinc is above hydrogen in the reactivity SERIES so it can displace hydrogen from HCl. Hope it HELPS :) PLS MARK IT THE BRAINLIEST |
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| 3504. |
some farmers use calcium hydroxide to control soil acidity . give the importance of this procedure and describe how acid rain is formed |
Answer» Hello matehere is the answer of your questionsome farmers USE calcium hydroxide to control SOIL ACIDITY . give the importance of this procedure and describe how acid rain is formed Answer no.1
= The effects of agricultural lime on soil are: it INCREASES the pH of acidic soil (the lower the pH the more acidic the soil); in other words, soil acidity is reduced and alkalinity increased. it provides a source of calcium and magnesium for plants. it permits improved water penetration for acidic soils Answer no.2Calcium hydroxide is a strong base and rapidly IONIZES to Ca⁺⁺ and OH⁻ ions. The calcium ions replace absorbed H ions on the soil colloid and thereby neutralize soil acidity. The carbonic acid formed (H₂CO₃) is a weak acid and partially ionizes to H⁺ and CO₂⁻² ions. Hope this answer will help youMark my answer as a brainlist answerMark my answer as a brainlist answer click on heart also |
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| 3505. |
B) Steam is passed over red hot wood charcoal. |
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Answer» Answer: When SUPER HEATED STEAM is passed through white HOT wood charcoal, it gets reduced to a mixture of X,Y and this reaction is named as Z. HOPE it HELPS you... MARK me as branlist ❤❤ |
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| 3506. |
A solution of calcium hydroxide in water . predict its ph level |
Answer» Estrela and Figueiredo13 state that calcium hydroxide is a white ALKALINE (pH 12.8) POWDER with poor SOLUBILITY in water (solubility of 1.2 g.L–1 of water at 25 °C). It is a strong base obtained by calcining calcium carbonate until it transforms into calcium oxide (quicklime)..... |
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| 3507. |
Hii guys....QUESTION:what is manganate in chemistry?? |
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Answer» maganate MEANS MnO4 Explanation: |
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| 3508. |
Write the steps involved in extraction of metals from ore |
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Answer» There are MANY steps involved in EXTRACTION of METAL from ORE LIKE digging,oreation etc |
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| 3509. |
Salt which can be used as supplement of calcium and iron obtained from which substance |
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Answer» Answer: SALTS which can be used as SUPPLEMENTS of calcium and iron are obtained from ASCORBIC acid, also known as vitamin C. Calcium and Iron are the supplements of Ascorbic acid, which enhances the absorption of nutrients such as iron, etc Explanation: |
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| 3510. |
Kcl.mgcl2.6h2o coardition compound name |
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Answer» the COMPOUND is not a co-ordination COMPUND. it is a DOUBLE salt called carnalite. |
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| 3511. |
write the structural formula of all possible isomers of aromatic compounds having the molecular formula C7H7Cl |
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Answer» I have DRAWN 4 isomers of C7H7CL and I don't think any more isomers should be there... |
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| 3512. |
What is the use of co2 gas in photosynthesis |
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Answer» Carbon dioxide provides the carbon that the plant uses to produce glucose. Carbon dioxide is combined with water USING the energy from sunlight. The carbon in glucose is not only used in CELLULAR respiration to make ATP, but actually makes up most of the plants Explanation: HOPE it HELPS you... MARK me as BRANLIST ❤❤ |
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| 3513. |
The particle of liquid move only when liquid is shaken |
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Answer» In liquids, particles are QUITE close together and move with random motion throughout the container. With an increase in temperature, the particles move FASTER as they gain kinetic ENERGY, resulting in INCREASED collision RATES and an increased rate of diffusion.F |
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| 3514. |
If ionization energy of chlorine is 349 then electron gain enthalpy will be |
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Answer» The electron gain ENTHALPY of chlorine is -349 kJ mol -1 . 35.5 G of Chlorine releases -349 kJ/mol of energy in gain of one electron, to from chloride ion. Therefore, 3.55 g of chlorine will RELEASE (-349x3. 55)/35.5 = -34.9 kJ/mol of energy. |
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| 3515. |
Explain how we can detect the ph level of an acid and a base and give examples of four indicators. what is the ph of metal oxides / hydroxides and non metal oxides / hydroxides??? and what are the exception?? |
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Answer» We can use many INDICATORS. such as,
The pH of Metal OXIDES / hydroxide are more than 7 i.e they are basic The pH of Non-metal Oxides/ hydroxide are less than 7 . i.e they are acidic. PLEASE MARK AS BRAINLIEST..... |
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| 3516. |
The degree of hydrolysis of 0.1 M NHCl solution is 1% . If the concentration of NH4Cl is made 0.4M what is the new degree of hydrolysis...? |
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Answer» degree of hydrolysis becomes half of INITIAL Explanation: hope the answer will help you |
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| 3517. |
Terline ke eklak kon kon se h |
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Answer» FOLLOW me follow me |
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| 3518. |
1. Arrange the following in the decreasing order of stability.N₂.02. F₂ |
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Answer» o2.n2.f2....,...... |
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| 3519. |
Name the element, which forms an ionic compound with chlorine. |
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Answer» Answer: sodium Explanation: |
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| 3520. |
A greyish black non-metal that is good conductor of electricity |
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| 3521. |
The gas which is responsible for green house effect |
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Answer» The primary GREENHOUSE gases in EARTH's atmosphere are water vapour, carbon dioxide, methane, CFC's, NITROUS oxide, and ozone. mark me as BRAINLIST |
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| 3522. |
Why does copper nail develops a green colour coating when it is kept in air for a long time |
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| 3523. |
Glucose on reaction with fehling solution gives |
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Answer» Answer: |
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| 3524. |
(i)Arrange the following alkenes in the decreasing order of stability:(a)CH3CHCH=CH2(b) CH3CH=C(CH3)CH3 |
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Answer» I think your question is not CORRECT PLEASE check option a .if it is CH3CH=CHCH3 then option b is more STABLE... |
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| 3525. |
explain how we can detect the ph level of an acid and a base and give examples of four indicators. what is the ph of metal oxides / hydroxides and non metal oxides / hydroxides??? and what are the exception??? |
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Answer» Answer: with the HELP of universal INDICATORS 2. METHYL orange |
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| 3526. |
❤❤JEE MAINS Important chapters for CHEMISTRY ❤❤❤❤❤❤❤ |
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Answer» #CARBON and it's compounds #Chemical reactions. . |
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| 3527. |
Name the folloiwng:a) substances whose atoms or molecules are arranged in a definite state. |
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Answer» crystals mark me asbrainlist |
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| 3528. |
What happens when Cl2 gas is passed through aqueous solution of KBr ? |
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Answer» Answer: When chlorine gas is passed through potassium bromide solution, potassium chloride and BROMINE are formed. ... In the solution of K-Br (Potassium Bromide) we-pass chlorine gas(CL2), then chlorine will DISPLACE Bromine-from K-Br and form potassium chloride (KCl) and librate Bromine, which ORANGE color to the solution |
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| 3529. |
Which of sulphuric acid makes it suitable to use a catalyst for the preparation of the esters |
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Answer» CONCENTRATED sulphuric ACID is USED for preparation of esters Mark me as brailnliest if you LIKE it |
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| 3530. |
A hydrocarbon containing two double bond on ozonlysis followed by hydrolysis forms 1 molecule of propan-1,3-dial,1molecule of propanone and 1 molecule of methanal. Deduce the structure of hydrocarbon and write its IUPAC name |
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Answer» Answer: 2-methylhexa-2,4-diene Explanation: |
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| 3531. |
The number of Sigma and Pi bond present in 1 3 butadiene in are respectively |
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Answer» CH2=CH-CH=CH2 |
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| 3532. |
20.) Which of the following pair has same number ofatoms?(1) 18 g water and 64 g SO,(2) 28 g N, and 28 g CO(3) 100 g Caco, and 18 g NHA"(4) All of these |
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Answer» Answer: Explanation: Both of them have same NUMBER of moles hence CONTAIN equal number of ATOMS |
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| 3533. |
Why do we apply oil on Iron tools kept in storage |
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Answer» Answer: it also acts as a protective COVER from ATMOSPHERE and this prevents rusting hope it was HELPFUL please mark as brainliest |
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| 3534. |
Hello all!!!!!! how will you convert methane to acetophenone? Correct answer will get brainliest |
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Answer» I have the perfect SON. B: Does he smoke? A: No, he doesn't. B: Does he drink whiskey? A: No, he doesn't. B: Does he ever come home LATE? A: No, he doesn't. B: I GUESS you really do have the perfect son. How OLD is he? A: He will be six months old |
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| 3535. |
Q4. A solution is prepared by mixing 150.0 mL of 1.00 x 10-M Mg(NO3)2 and250.0 mL of 1.00 10 M NaF. Calculate the concentrations of Mg.and Fatequilibrium with solid| MgF2 (Kg) = 6.4 x 10+). |
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Answer» any OPTIONS? |
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| 3536. |
Describe the laboratory preparation of water |
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Answer» In this method, water is FIRST PLACED in a distillation flask which is connected to a liebig condenser, which is further connected to a RECEIVING flask. Then the distillation flask is heated until the water within STARTS boiling and evaporates to travel to the liebig condenser, where the vapor is cooled back to water. |
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| 3537. |
Explain how salt bridge maintains electrical neutrality of the two half cell solution(For 2 marks) |
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Answer» Answer: salt bridge is U tube like structure filled with AGAR agar SOLUTION.it maintains NEUTRALITY in the the solution.it prevents liquid liquid junction between both tha HALF cell.Explanation: hope the answer will help you |
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| 3538. |
An element forms two oxides containing respectively 53.33 and 36.36 per centShow that these figures illustrate the law of multiple proportions |
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| 3539. |
What is velocity...... |
Answer» ☆→→ ᵗʰᵉ ˢᵖᵉᵉᵈ ᵃᵗ ʷʰⁱᶜʰ ˢᵒᵐᵉᵗʰⁱⁿᵍ ᵐᵒᵛᵉˢ ⁱⁿ ᵃ ᵖᵃʳᵗⁱᶜᵘˡᵃʳ ᵈⁱʳᵉᶜᵗⁱᵒⁿ.←←☆hope it HELPS you ❤️✌️
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| 3540. |
What is the mass percent of carbon in carbon dioxide? |
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Answer» What is the MASS % of carbon in carbon dioxide ? The mass % of carbon in carbon dioxide is 27.27%. The MOLECULAR formula for carbon dioxide is CO2. The molecular mass of carbon dioxide is 12+2×16 =44g/mol. Mass % of carbon in carbon dioxide is =
= 27.27 % Formula used here :-------------------------------------- |
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| 3541. |
Why hydrogen called rough elements? |
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Answer» because he have CHARACTER of IA and VIIB ELEMENTS in PERIODIC table |
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| 3542. |
What happens if acetone liquid chemical mixes with MnO2? |
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Answer» it will CONVERTED into ALCOHOL Explanation: hope the answer will HELP you |
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| 3543. |
What are called halogen elements? in which group they exist? |
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Answer» halogen halogen elements are ththe elements that have 7 valence electrons in the outermost SHELL |
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| 3544. |
describe how we can do electroplating of silver on an iron spoon ,, then give the elements that will be anode ,,, then the cathode and the solution used |
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Answer» i don't KNOW the answer |
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| 3545. |
Ehy ICl is more reactive than I2 |
| Answer» INTERHALOGEN compounds are more REACTIVE than halogens (except fluorine ) because I-Cl in INTERHALOGENS is WEAKER than I-I bond in halogens except F-F bond. | |
| 3546. |
Which liquid becomes solid upon hearing answer : idly batter |
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Answer» I can't UNDERSTAND your ANSWER |
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| 3547. |
how are the products different in the electrolysis of molten sodium chloride and a solution of sodium chloride . show the redox reaction |
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Answer» Answer: NaCl → Na +(l) + Cl–(l) At CATHODE: reduction of 2NA+(l) + e– → Na(l) At anode: oxidation of 2Cl–(l) → CL2(G) + 2e– Net Reaction is written as: 2Na +(l) + 2Cl–(l) → 2Na(l) + Cl2(g) Explanation: |
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| 3548. |
Give the classification of the materials on the basis of atomic structure? |
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Answer» Explanation: Solid materials have been conveniently grouped into three basic classifications: metals, ceramics, and polymers. This SCHEME is based primarily on chemical MAKEUP and atomic structure, and most materials fall into ONE DISTINCT grouping or another, although there are some intermediates. |
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| 3549. |
Heya_______________❤ ___________Two examples of reactions in which white precipitates are formed.....¿ |
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Answer» Answer: 1.Na2CO3 +BaCL2 ------>2 NaCL +BaSO4(PPT) HOPE it helps..... |
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| 3550. |
A compound with low boiling point,is:A.NaclB.CaCl2C.KClD.CCl4 |
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Answer» a compound with low BOILING POINT is A. NACL |
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