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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.
| 3651. |
Critical point of a substance |
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Answer» Hiii .........this your answer...I HOPE it will help you. |
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| 3653. |
Explain how soap cleans. |
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Answer» Answer: The cleaning ACTION of soap is due to micelle formation and emulsion formation. Inside water a unique orientation forms clusters of molecules in which the hydrophobic tails are in the interior of the cluster and the ionic ends on the surface of cluster. This results in the formation of micelle. Soap in the FORM of micelle cleans the (dirt) OIL as the oil will be collected at the centre of micelle. This property of soap makes it an emulsifier. The dirt suspended in micelles is easily rinsed away. This is known as cleaning action of soap. Explanation: A soap molecule has different polarities. At one end of it is the long HYDROCARBON chain that is non-polar and hydrophobic, i.e. insoluble in water but soluble in oil. At the other end is the short polar carboxylate ion which is hydrophilic i.e.,soluble in water but insoluble in oil and grease. When soap is shaken with water it becomes a soap solution that is colloidal in NATURE. |
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| 3654. |
The freezing point depression constant for water-1.86 c m¹.if 500 g Na2So4 is dissolved in450 g H2O. the freezing point is changed by-3.82°C. Calculate the vant Hotf factor for Na2So4(1) 2.05(2) 2.63(3) 3.1114) 0.381 |
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Answer» Answer: 3. will be CORRECT answers Explanation: i = 1+ (n - 1) n = no of ions hope the answer will HELP you MARK the answer BRAINLIESTS please |
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| 3655. |
Explain vsepr theory. |
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Answer» VSEPR Theory is used to PREDICT the shape of the molecules from the electron pairs that surround the central atoms of the MOLECULE. ... VSEPR theory is based on the assumption that the molecule will take a shape such that electronic REPULSION in the valence shell of that atom is minimized. |
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| 3656. |
Explain in detail about f block element? |
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Answer» The F block elements are the lanthanides and actinides and are CALLED the inner transition elements because of their placement in the periodic table due to their electron configurations. The f orbitals of the electron shell are filled with “n-2.” There is a maximum of fourteen electrons that can occupy the f orbitals. |
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| 3657. |
IN AN EXPERIMENT DILUTE SULPHURIC ACID IS RUN INTO A FLASK OF AQUEOUS BARIUM HYDROXIDE UNTIL THE REACTION IS COMPLETE NAME THE TWO PROCESSES THAT HAPPENED IN THIS REACTION |
Answer» Answer:The reaction between Ba(OH)2 and dil. H2SO4 is : Ba(OH) 2 + dil. H2SO4 --> BASO4 (s) + 2H2O (l)The TWO processes involved in this reaction are :
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| 3658. |
1. What is the expected major product from the reaction of (4R,5R,6S)-6-chloro-7-cycloheptyl-4,5-epoxy-5-ethyl-2,6-dimethylheptane-1-ol with 48% aqueous hydrobromic acid?Select one:a. (4R,5R,6R)-5-bromo-6-chloro-7-cycloheptyl-5-ethyl-2,6-dimethylheptane-1,4-diolb. (4R,5R,6S)-4-bromo-6-chloro-7-cycloheptyl-5-ethyl-5-hydroxy-2,6-dimethylheptane1-olc. (4R,5R,6R)-4-bromo-6-chloro-7-cycloheptyl-5-ethyl-2,6-dimethylheptane-1,5-diold. (4R,5S,6S)-5-bromo-6chloro-7-cycloheptyl-5-ethyl-2,6-dimethylheptane-1,4-diole. (4S,5S,6R)-5-bromo-6-chloro-7-cycloheptyl-5-ethyl-4-hydroxy-2,6-dimethylheptane-1-ol2. Which of the following sets of compounds contain a pair of diastereomers?(i) (S)-2-tert-butyl-2-methylcyclobutanone & (R)-2-tert-butyl-2-methylcyclobutanone(ii) salt of (R)-phenylethylammonium with (2S,3S)-2,3-dihydroxybutanedioic acid & salt of (S)-phenylethylammonium with (2S,3S)-2,3-dihydroxybutanedioic acid(iii) (S)-1-cyano-2-propanol & (R)-1-cyano-2-propanol(iv) (S)-methylphenyl-n-propylphosphine & (R)-methylphenyl-n-propylphosphine(v) (2S,3R)-2,3-butanediol & (2R,3S)-2,3-butanediolSelect one:a. all the aboveb. (iv) onlyc. (i) and (v)d. (i) onlye. (ii) only3. Which of the following sets of compounds are enantiomers?(i) (1R,4S)-1,4-cyclohexanediol & (1S,4S)-1,4-cyclohexanediol(ii) (1R,2R)-cyclopentane-1,2-diol & (1R,2S)-cyclopentane-1,2-diol(iii) (3S,4R)-3,4-dibromo-3,4-dimethylhexane & (3R,4R)-3,4-dibromo-3,4-dimethylhexane(iv) (S)-2-chlorocylopropanone & (R)-2-chlorocylopropanone(v) (R)-a-methylbenzylamine & (S)-a-methylbenzylamineSelect one:a. (i) onlyb. (i) and (iii) onlyc. (iii) and (iv)d. (iv) onlye. (iv) and (v)4. Which of the following are meso compounds?(i) (1R,2S,3S,4R)-1,2-dibromo-3,4-dimethylcyclobutane(ii) (1R,3S)-1,3-cyclohexanediol(iii) (2R,3S)-2,3-dibromobutanedioic acid(iv) (3R,4S)-3,4-dibromo-3,4-dimethylhexane(v) (2R,3S,4S)-2,3,4-tribromopentaneSelect one:a. (iv) onlyb. (i) and (ii) onlyc. all the aboved. none of the abovee. (iii) and (v) only5. Which of the following compounds DO NOT contain a plane of symmetry?(i) trans-3,4-diethylpyrrolidine(ii) trans-2-butene(iii) cis-1,2-cyclobutanediol(iv) 4-chlorocyclohexanol(v) cis-1,2-dibromocyclopentaneSelect one:a. (i) onlyb. (ii) onlyc. (i) and (iii) onlyd. all the abovee. none of the above6. What is the expected major product arising from the reaction of (2R,3E)-4-phenyl-3-butene-2-ol with sodium dichromate and sulfuric acid?Select one:a. (2R)-4-phenyl-2-butanolb. (3Z)-4-phenyl-2-butanonec. 4-phenyl-2-butanoned. 4-phenyl-2-butanole. (3E)-4-phenyl-3-buten-2-one7. What is the expected major organic product expected from reaction of cyclopentene with cold potassium permanganate under basic conditions?Select one:a. a pair of diastereomeric 1,2-cyclopentanediolsb. (1R,2R)-1,2-cyclopentanediolc. meso-1,2-cyclopentanediold. (1S,2S)-1,2-cyclopentanediole. no reaction |
Answer» Meso CompoundsExplanation: A meso compound is a non-optically participating part of a COLLECTION of STEREOISOMERS, at shortest two of which are optically determined. This indicates that notwithstanding including two or more stereogenic centres, the particle is not chiral. A meso composite is "superposable" on its reflector vision (not to be CONFOUNDED with superimposable, as any two things can be superimposed above ONE different unheeding of whether they are alike). Two things can be superposed if all phases of the things match and it does not create learning when examined with a polarimeter. To learn more: i)Difference between racemic mixture and meso compound - Brainly.in ii)Why meso compound are optically inactive?? - Brainly.in |
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| 3659. |
Two methods of preparation of ethylene and write reaction ethylene |
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Answer» Answer: DESCRIBE two methods of preparation of ETHYLENE. Give equation for the reaction of ethylene with the following : (i) Ozone (ii) Hypohalous acid (III) Cold and DIL. alk. KMnO4 (iv) HEATED with O2 at high pressure Explanation: |
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| 3660. |
Which of the noble gas is not present in atmosphere |
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Answer» its RADON.... |
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| 3662. |
In mendeleevs table why do you think the noble gases are placed in a separate group? |
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Answer» Noble gases were discovered after mendeleev put forth the periodic table. WITHOUT DISTURBING the original periodic table, zero group was made to place noble gases. If noble gases are placed in original periodic table, there would be DISTURBANCE in original periodic table. Hope it helps you. Please mark it as BRAINLIST. |
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| 3663. |
How to convert benzene into N,N-dimethyl aniline? |
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Answer» How WOULD BUILDING NEW factories in Croatia help increase the country's gross domestic product (GDP)? Explanation: |
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| 3664. |
4) Write the IUPAC names of the following.(a) CH3 -CO-CH (b) CH3 - CH2 - NH,(c) CH2 - CH2 -OH5)Write chemical equation for the following. |
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Answer» REFER to NCERT BOOK of class 11 chemistry LAST chapter Explanation: ok so please rate me as a 5 star or 1 star but rate it please |
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| 3665. |
Find the temperature in 0C at which volume and pressure of 1mol of nitrogen gas becomes 10 dm3and 2.46 atmosphere respectively. |
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Answer» Explanation: RESPECTIVELY is an ADVERB which means "in the order given." Example sentence: I gave the bag and BOOK to Trish and Sam, respectively. (i.e. I gave the bag to Trish and I gave the book to Sam.) RESPECTIVE is an adjective which means "SEPARATE."Jun 20, 2013 |
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| 3666. |
When metals chemically react with non-metals, they form |
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Answer» When METALS react with non-metals, electrons are transferred from the metal atoms to the non-metal atoms, forming IONS. The resulting compound is called an ionic compound. Reactions between metals and non-metals include: sodium + CHLORINE → sodium chloride.
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| 3667. |
Example of word equation |
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Answer» In chemistry, a word EQUATION is a CHEMICAL reaction expressed in words rather than chemical formulas. A word equation should state the reactants (starting materials), products (ENDING materials), and direction of the reaction in a form that could be used to write a chemical equation. Explanation: Please mark me as Brainliest . |
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| 3668. |
How to define n factor in case of ionic salts like fe2(so4)3 in which no ionisable H ions are present |
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Answer» The present is the TIME that is associated with the events PERCEIVED directly and in the first time, not as a recollection or a speculation. It is a period of time between the past and the future, and can vary in meaning from being an instant to a day or............................. |
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| 3669. |
Cac2 +h20=? answer right now |
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Answer» Ca(OH)2 + ethylene Explanation: hope the answer will HELP you |
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| 3670. |
TWO WAYS TO TEST THE PRESENCE FOR NITRATES |
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Answer» Answer: For nitrates Explanation: #1 *Salt in a dry test TUBE+conc H2SO4 = reddish brown gas appears nitrate may be PRESENT *Brown ring test: Solution of salt in water+equal amount of Mohr's salt+conc h2so4 is added along the sides of the test tube UNDISTURBED =Brown ring is formed at the junction .HENCE nitrate is confirmed |
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| 3671. |
Chemical equation for HALIDES and SULFATE and NITRATES and CARBONATES |
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Answer» I not INTERESTED these QUESTION |
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| 3672. |
The velocity of a body becomes 4 times and its mass becomes half. The Kinetic energy becomes :(1) 8 times(2) 6 times(3) 2 times(4) 16 times |
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Answer» V वेग और m द्रव्यमान पर गतिज ऊर्जा = 1/2 mv² जब वेग 4 गुना और द्रव्यमान आधा हो जाऐ तो गतिज ऊर्जा = 1/2 *m/2 * (4V)² = 1/2 * m/2 * 16v² = 8 * 1/2*mv² वेग 8 गुना हो जाएगा । |
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| 3673. |
Name the common solvents used in the process of crystalization |
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Answer» Answer: Dimethyl sulfoxide (DMSO), methyl sulfoxide (CH3SOCH3) is USED mainly as solvent for REACTIONS; rarely for crystallization. It boils at 189 °C (372 °F), and is hard to REMOVE. 4. Methanol (CH3OH) is a USEFUL solvent that will dissolve compounds of higher POLARITY than other alcohols Please Follow me upMARK ME AS BRAINLIEST |
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| 3674. |
Objective of size reductioni |
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Answer» Answer: incomplete Explanation: The QUESTION is incomplete.. |
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| 3675. |
When methanol is treated with acidified potassium dichromate a new compound formed is 1. Acetic acid2.Formaldehyde 3.Formic acid 4.Acetaldehyde |
Answer» ACETIC ACID ........... |
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| 3676. |
The indicator which does not change colour on passage of hcl gas is |
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Answer» Answer: We KNOW that the colour of litmus paper is changed by H + ions because of acid. Dry HCL it does not dissociate to give H+ ions. ACIDS dissociate to give ions only in the aqueous SOLUTION. In this HCL is not in aqueous form nor litmus paper is wet, so the colour of litmus paper does not CHANGE |
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| 3677. |
Which is pseudohalogen compound |
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Answer» Answer: The compound that ACT as HALOGENS . CN- Explanation: |
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| 3678. |
How can we say that sugar is solid and water is liquid |
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| 3679. |
I have a 5 ltr pressure cooker. Is there a minimum quantity to which I can cook rice in it? |
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Answer» Explanation: Cooked rice refers to rice that has been cooked either by steaming or boiling. The TERMS steamed rice or boiled rice are also commonly USED. Any VARIANT of Asian rice, AFRICAN rice or wild rice, glutinous or non-glutinous, long-, MEDIUM-, or short-grain, of any colour, can be used. |
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| 3680. |
What will happen nh(oh) till in excess to a solution of zncl |
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Answer» Explanation: Whilst ZINC chloride is very soluble in water, solutions cannot be considered to contain simply solvated Zn2+ IONS and Cl− ions, ZnClxH2O(4−x) species are also PRESENT. AQUEOUS solutions of ZnCl2 are acidic: a 6 M aqueous solution has a PH of 1. |
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| 3681. |
Veena observes that during winter setting of milk into curd takes more time while during summer, the same process happens faster. She asks about this difference in time taken to her elder sister. She also asks her sister about why certain reactions occur rapidly while others occur slowly. Her sister explains her about the various factors that affect the rate of chemical reactions. Based on the above scenario, answer the following questions. (a) Why do you think setting of curd occur at different rates during different seasons? (b) The rate of different reactions is different. Justify the statement. (c) The reaction of aluminium metal with dilute hydrochloric acid takes place faster as compared to zinc metal. What could be the reason for this difference? (d) How does the size of particles of reactants affect the rate of reaction? (e) You come across various chemical changes in your daily life. Mention any two chemical changes that occur slowly under normal conditions. |
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Answer» Normal conditions are a restriction on philosophical arguments, especially in epistemology, in order to avoid objections perceived as DIGRESSIVE. As a reply to objections to an explanation of a phenomenon, e.g. a hypothesis or a THEORY, it is said, ARGUMENT X holds [only] under normal conditions. |
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| 3682. |
two ways you can test the presence for CARBONATES HALIDES SULFATE NITRATES |
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Answer» Answer: There are several different tests that can be USED to identify compounds WITHIN an unknown mixture. Particularly carbonates can be identified using dilute acids and limewater. HALIDES can be identified using silver nitrate and dilute nitric acid. Sulfates can be identified using BARIUM CHLORIDE and hydrochloric acid. |
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| 3683. |
What could be the pH range of aqueous solution of gas X |
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Answer» 1-7......... hope it will HELP you...... |
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| 3684. |
Morhs 1st moment theoremn |
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Answer» HEYA MATE YOUR ANSWER IS It is MEASURED perpendicular to the undeformed neutral AXIS (i.e. the x-axis) and so is 'vertical'. This is Mohr's First Theorem (Mohr I): The change in slope over any length of a member SUBJECTED to bending is equal to the area of the curvature diagram over that length HOPE TJIS HELPS ❤️ PLEASE MARK AS BRAINLIEST ❤️❤️ |
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| 3685. |
Why alcl3 follow-octate rule in water |
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Answer» Answer: Answer. Answer: it is bcoz the central ATOM - Al has 6 ELECTRONS in it's valence shell but still it is stable. This violates OCTET Rule. Hope it helps |
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| 3686. |
1-Bromo-3-chlorolyclohex-1-ene |
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Answer» STRUCTURE of 1-Bromo-3-chloro cyclohex-1-ene Refer to The ATTACHMENT. |
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| 3687. |
A mixture of iodine and sulphur can be seperated by the treatment with |
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| 3688. |
Preparation of benzoic acid from n- propyl benzene |
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Answer» Explanation: Benzoic acid is a white solid with the formula C₆H₅CO₂H. It is the SIMPLEST aromatic carboxylic acid. The NAME is DERIVED from gum benzoin, which was for a long time its only source. Benzoic acid occurs naturally in many plants and SERVES as an intermediate in the biosynthesis of many secondary metabolites. |
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| 3689. |
What are some industries that separate mixtures |
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Answer» Explanation: straightforward' oil on top and SHAKE it, all you need to do to separate the oil and the water is to put the jar on a table and WAIT. SHORTLY there will be a LAYER of oil floating on the surface and all that is left to do is to remove the oil layer.Aug 2, 2013 |
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| 3690. |
IUPAC NAME OF [Pt(NH3)3Br] |
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Answer» triamminebromidoplatinum(oxdn no ) |
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| 3691. |
Hey guys please answer the question |
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Answer» 2 and answer is ......... |
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| 3692. |
Ssquare?lli column and alo2oF1-Fluto(Along the first row 4+22-1511 11 11 11devotel 5.18 of 4. A rectangular sheet of paper is 12-5 cm long and 10 cm wide.Find its perimeter.ve 5. Find the perimeters of (i) A ABE (ii) the rectangle BCDE in this Bfigure. Whose perimeter is greater?wide.6. Salil wants to put a picture in a frame. The pictucm wide. HeTo fit in the frame the picture cannot be more than 7the picture be trimmed? |
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| 3693. |
Calculate no of atom in 1g of ag |
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Answer» |
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| 3694. |
Which of the following graphs represent an exothermic reaction?Pls tell me fast it's very urgent |
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Answer» Heya MATE..... where are the GRAPHS.... ur QUESTION is INCOMPLETE |
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| 3695. |
Which is usually associated witga slower reaction rate?a) ringing a bell near the reactants b) adding heat energy to the reactants c) using a weak solution of the reactants d) using a solid with a high surface area in the reactants |
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Answer» B IS CORRECT ANSWER........ I HOPE HELP YOU...... OKKKKK ... THANKS...... NO PROBLEM...... |
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| 3696. |
What is the relation between Kp and Kc at equilibria constant of N2 +3H2= 2NH3 |
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Answer» Answer: kp = kc(RT) ^-2 Explanation: |
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| 3697. |
Theoretically canthe concentration of reactant reduced to 0 after infinite time |
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Answer» Explanation: It is Capable of Measuring Tri-axial High-frequency Mechanical Vibrations, Temperature, and Acoustics. It is Portable, Magnetic & Stud Mounted. It can be ATTACHED to any surface, and immediately starts providing Mechanical data. It helps you monitor your MACHINES and equipment THEREBY preventing UNPLANNED Downtime, Increasing Productivity and Minimizing Breakdowns and the Cost of maintenance. Configurable Frequency based Diagnostic on the edge. |
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| 3698. |
Write the bond line formula for the following structure: |
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Answer» 3) pentane 4) 2,3 dimethyl butane |
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| 3699. |
Give reason: the weight of an object changes from place to place though its mass is constant |
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Answer» Mass of an OBJECT is CONSTANT WHEREAS the weight of an object CHANGES from place to place. Mass of an object is actually the amount of MATTER it contains and it would remain the same unless there is change in the amount of matter whereas weight of an object is the force on it due to gravity.. |
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| 3700. |
ठोस पदार्थ का बहाव क्यों नहीं होता |
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Answer» Answer: क्रिस्टलीय ठोस वास्तविक ठोस पदार्थ होते हैं। अक्रिस्टलीय ठोस (Amorphous Solids). अमोरफस एक ग्रीक शब्द है, जिसका अर्थ "आकृति नहीं होना" होता है। SOLID Substances have their molecules intact to each other , so they can't be SEPARATED EASILY . They have a shape that can't be changed . So they loose the tendency to flow due to such close packaging of molecules . |
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