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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.
7651. |
h 10 ml of H to form water. When 200 ml of H2 at STP is passedthe Cuo loses 0.144 g of its weight. Does the above data correspondd p.n hond order on Po ion.to the law of constant composition?3- |
Answer» In the second experiment 0.144 g weight is lost from CuO. This is due to the reduction of CuO into Cu. In other words, 0.144 g oxygen combined with 200 mL H 2.32 g oxygen occupies 22400 mL volume at STP.0.144 g oxygen will occupy = 22400 x 0.144/ 32= 100.8 mL-O23It means the ratio of H2 and O2 in water is 200 : 100.8 =2: 1. The same ratio is in first case (10:5 or 2:1). Thus, the law of constant composition is proved. thanks |
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7652. |
Hou will you find the valencychlorne sulphur andmagnesium? |
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7653. |
The environmental load factor can be defined asDescription(Amount of product formed lexpected amount of by product) 0100Total mass of efmluent generated/ mass of desired product% selectivityOptiono co D% conversionQuestionsBookmark InvalidFirst Previous Next Last |
Answer» Option A is correct which is proper definition of evironmental load factor. |
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7654. |
Part 1 of 110.0Question 7 of 10What can a line graph be used to do? Select the best answerO A. Make comparisonsO B. Make predictionsO C. Identify positive correlationO D Identify negative correlationReset SelectionPreviousNextere to search |
Answer» graph can be used for making predictionslike what has happened can be plotted in its basis we can predict its future. All of the visible color light waves together make up |
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7655. |
( 1 ) 0.1 \quad ( 2 ) 0.2 \quad ( 3 ) 0.3 |
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7656. |
7 Calcolse the namber of ses of C and0unsopmspanel Citl Off0 |
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7657. |
0.02 \quad ( B ) 3.125 \times 10 ^ { - 2 } \quad ( C ) 1.25 \times 10 ^ { - 2 } \quad ( D ) 2.5 \times 10 ^ { - 2 } |
Answer» In one mole of Mg3(PO4)2 ,no. of moles of oxygen is = 4*2 = 8 so, 8 → 1=> 1 → 1/8 moles of Mg3(PO4)2=> 0.25 → 1/8*(0.25) = 1/32 moles of Mg3(PO4)2 = 0.03125 moles option option B |
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7658. |
28. Calculate the mass in grams of 0.17 mole of hydrogen sulphide, HS(Atomic masses : 1.2 1 u, s-32 u) |
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7659. |
how all acids have common and all the base have common? |
Answer» Both acids and bases have a few common characteristics. Some of them are: # They have the capability of conducting electricity. # They become neutralized when they are disassociated in water or when they release their ions into water. # They can change the color of litmus paper although the color differs for each of them. Acidsgive off H+(Hydrogen) ions in water;basesgive off OH-(Hydroxide) ions in H2O.Acids generally taste sour due to sour H+ ion;Basestaste bitter due to OH- ion; but they may haveother tastes depending on other part of molecule.Acidscorrode active metals.Basesdenature protein. Acidsgive off H+ (Hydrogen) ions in water;basesgive off OH- (Hydroxide) ions in water.Acids generally taste sour due to sour H+ ion;Basestaste bitter due to OH- ion;but they may haveother tastes depending on other part of molecule.Acidscorrode active metals; Basesdenature protein. |
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7660. |
When temperature is increased,surface tension of water:(A) Increases(B) Decreases(C) Remains constant(D) Not related at all79. |
Answer» Surface tension decreases with increase in temperature because cohesive forcesdecreasewith an increaseof molecular thermal activity.Ans:(B) |
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7661. |
.In2. Which of the following has ester linkage?a. Nylonb. BakeliteTerylened. PVCfint observed by |
Answer» Terylenehas ester linkage Answer:c) TeryleneExplanation: the answer is terylene option B is the correct answer Terylene is the correct answer |
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7662. |
Exercise 10.Calculate Vms of O2 at 273K and 1x 10 Pa pressure. The density of O2 under theseconditions is 1.42 kg/m'? |
Answer» Data are given in SI units C = √3P / d =√3 × 105/ 1.42 = 459.63 m sec–1 |
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7663. |
4.If mass of KCl formed in the reactionKCIO, KCI + 20, is1.625 g, how many litres of o gas is produced at latm and 273K.(A) 0.977L(B) 1.02 L(C) 1.23 L(D) 1.42L |
Answer» Correct option =(A) .. Please like my answer.... And choose for Best... a is correct option please like my answer |
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7664. |
VERY SHORT ANSWER QUESTION:S1. What is polymer?2. Explain the term polymerization.3. What are fibers and elastomers?4. Name the monomer used for making synthetic rubber.5. What is high density polythene?6. What is chain growth polymerization?7. How Bakelite is prepared?8. Write monomers of nylon- 669. Write structure and monomer of PMMA10. What are homopolymers and hetropolymer11. Explain functionality of monomer.12. Give monomer of Glyptal.s? |
Answer» polymer is a large molecule, or macromolecule, composed of many repeated subunits. Due to their broad range of properties, both synthetic and natural polymers play essential and ubiquitous roles in everyday life. 1 and 2 3 4 7 8.Monomers of nylom-6,6 are adipic acid and hexamethylenediamine 9 10 10 12 |
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7665. |
Which is the best reagent to convert cyclohexanol into cyclohexene.(A) conc. HCI[JEE-2005, 3/nCl2(B) conc. HBr(C) conc. H3PO4(D) HCI + Z |
Answer» The correct answer is OPTION "C": Conc. H3PO4 In the presence of strong acid, 85% Phosphoric acid and under the presence of heat, cyclohexanol gets converted into cyclohexene Plz mention order of acidic strength among given options in this question |
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7666. |
Fe/HCI273K |
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7667. |
20a ofcaloz is heated with 209 HQ, howmany grams of coa can be produced tothe reaction call; t she calls + H2O + CO2 |
Answer» The amount of CO2 left will be only 5 grams |
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7668. |
Explain natural polyamide fibers with example. |
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7669. |
1. Calculate the volume of water to be added to 400solution tomake itmi of seminormal HCIdecinormai(2) 1200 ml(3) 160O ml(4) 200o ml |
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7670. |
..What does the expression1 →→J. A represent? 4(a)(b)(c)(d)Power densityRadiation resistanceMagnetic energy densityElectric energy density |
Answer» power density is the answer |
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7671. |
Write the IUPAC names ofCHCHCH,-CH-CH,-CH2-CH,a) cH, -C-cH, -C-CH, b)онCHCH |
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7672. |
Write the IUPAC name of the following compounds.(1) CH,CH,C(CH)(3) C,H,CH(CH),C(CH,)(2) [(CH),cI,CCH(CH)23/2(4) (CH)2CHCH2CHCHCaH21 45 |
Answer» 1) 2,2-dimethylbutane 4) 3-ethyl-5-methylheptane |
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7673. |
1. A solution is prepared by mixing 1.0 grams of benzene (C6H6)in 100 g of water to create a solution total volume of 100 ml.Calculate the molarity, mass percent, mole fraction, and molalityof benzene in the solution. |
Answer» 1. molarity (1.0 grams benzene) / (78 g/mol) = .0128 moles benzene (0.128 moles0 / (0.100 L) = 1.28 Moles/Liter mass percent total mass = 1.0 g benzene + 100 g water = 101 g 1.0 grams benzene / (total mass) 1.0 g benezine / 101 g * 100 = .99 percent benzene mole fraction (1.0 grams benzene) / (78 g/mol) = .0128 moles benzene (100 g water) / (16 g/mol) = 6.25 moles water (.0128 moles benzene) / (.0128 moles benzene + 6.25 moles water) = .20 % benzene molality (1.0 grams benzene) / (78 g/mol) = .0128 moles benzene (.0128 moles benzene) / (.1 kg water) = 1.28 mole/Kg |
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7674. |
For preparing one litre N/10 solution of H2SO4, the amount of H2SO4needed |
Answer» H2SO4 -----> 2H+ + SO$ -- you require a N/10 solution i.e.0.1 Normal solutionfrom the equation above 1 Molar soluation of H2SO4 is equal 2 N solution molecular weight of H2SO4= 98 gmsfor 1 M solution you would require 98 gms = 2 N solution1 N solution would require 98/2 = 49 gmsfor a 0.1 N solution = 4.9 gms |
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7675. |
2. In an endothermic reaction, the value of Δ// is :(CBSE 1999)(a) zero(c) negative(b) positive(d) constant |
Answer» positive |
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7676. |
can rate constant be negative. if not why not. |
Answer» If you are only examining a single reaction, then the answer is no. Given that the pre-exponential factor of the Arrhenius equation is always positive (otherwise, you would potentially have arate constantof 0, meaning the reaction never occurs), therate constantis nevernegative can it be negative for any of other reaction than first order |
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7677. |
1.Choose the correct answer.Sound can travel through(a) gases only(c) liquids only(b) solids only(d) solids, liquids and gases. |
Answer» Option (d) Solids , liquids and gasesIs the correct answer Sound travelsin mechanical waves. A mechanical wave is a disturbance that moves and transports energy from one place to anotherthrougha medium. Insound, the disturbance is a vibrating object. ... This means thatsound can travel throughgases, liquids and solids. option no 4th solids,liquids and gases 22 d right answer heee option d is the correct answer solid liquid and gases d is correct because sound travel through solid,liquids and gases (d) soil,liquid and gases option d is the correct answer (d) solids,liquids and gases Sound travelsin mechanical waves. A mechanical wave is a disturbance that moves and transports energy from one place to anotherthrougha medium. Insound, the disturbance is a vibrating object. ... This means thatsound can travel throughgases, liquids and solids. Option d is a correct answer of this question option (a) is the correct answer because sound cN travel only through air |
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7678. |
65. Calculate the pH of a solution obtained by mixing 0.1 litre of pH 4 and 0.2 litre of pH 10.66 Calculate the pH of solution obtained by mixing 10 ml of 0.1 M HCI and 40 ml of 0.2 M H2SO |
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7679. |
name one characteristic of solids that is use ful to us |
Answer» is the correct answer for this question it is hard and can be used to give the shape of any structure. Please send question in hindi yang men in your company matels is use of our daily life |
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7680. |
Calculate the pH of a solution containing 2.0 gofNaOH per litre of the solution |
Answer» concentration of NaOH = (2/40)mol/L = 0.05M so, concentration of OH- = 5×10-² now, pOH = -log10[5×10-²] = -[log10[5] -2] =2-log5 = 2-0.7 = 1.3 so pH = 14-pOH = 14-1.3 = 12.7 |
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7681. |
Calculate the strength in volumes of a solution containing 30.36 g/l of H202 |
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7682. |
It is more difficult to walk on ice thanon a concrete road becauseA) there is very little frictionbetween the ice and feet pressingitB) ice is soft when compared toconcreteC) there is more frictionbetween the ice and feerD) of these |
Answer» A) there is very little friction between the ice and feet pressing it |
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7683. |
efine sublimation, name two solids that sublime on heating. |
Answer» Sublimation is a chemical process where a solid turns into a gas without going through a liquid stage. Example: Iodine and camphor. |
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7684. |
is found to be38. An aqueous solution of boric acid is foundweakly acidic in nature. This acidic charactedue to the following reasons.(a) It is a protic acid which donates protonaqueous solution.(b) It is a Lewis acid which abstracts OH fromwater and leaves H to make the solutionacidic.(c) It gives metaboric acid when dissolved inwater.(d) It is prepared by reaction of borax withsulphuric acid hence it behaves as an acid. |
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7685. |
VICINCA JUN ulu.How is butanoic acid prepared starting from(i) An alcohol (ii) An Alkyl halide (iii) An alkene?and UUDAC name of the |
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7686. |
Whena solid melts. its temperatureremains the same, so where does the heat energy go? |
Answer» When a solid melts, its temperature remains the same because the heat energy supplied is utilised to break thebondsbetween the particles of matter. Therefore, the temperature of the solid does not change till all the solid melts. |
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7687. |
when a solid melts ,it's temperature remains the same ,so where does the heat energy go? |
Answer» When a solid melts, its temperature remains the same because the heat energy supplied is utilised to break the bonds between the particles of matter. Therefore, the temperature of the solid does not change till all the solid melts. |
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7688. |
When a solid melts, its temperatureremains the same, so where does the heatenergy go? |
Answer» When a solid melts, its temperature remains the same because the heat energy supplied is utilised to break the bonds between the particles of matter. Therefore, the temperature of the solid does not change till all the solid melts. |
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7689. |
Reactionbetween N2 and O takes place as follows:If a mixture of 0.482 mol N2 and 0.933 mol of O is placed in a 10 L reactionvessel and allowed to form N,G at a temperatudetermine the composition of equilibrium mixture.re for which Kc= 2.0× 10-37diven |
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7690. |
321n open flask at 25°C contains air. Calculate thetemperature at which one fifth of air measured a25°C escapes. |
Answer» According to Charle's law - T is directly proportion to VThus V1/V2 =T1/T21 /1/5=298/T2(Let volume at initial is 1 and after 27℃ temp. Volume remains 1/5 of initial volume)T2=T2=396K but ans is 99.5 degres celsius |
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7691. |
d bottomed flask at 27a lapse of time, he real5.11 A student forgot to add the reaction mixture to the rounbut instead he/she placed the flask on the flame. Afterhis mistake, and using a pyrometer he found the temperatuC. What fraction of air would have been expelled out?of the flask was 47 |
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7692. |
Changefollowing2on ti533 573 K into10 73 Cinto K127( into K90.4 F into5. 39 C inta |
Answer» the answer is zero so will be correct .................... |
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7693. |
If 10^-4 dm³ of water is introduced into a 1.0 dm2flaskat300 K, how many moles of water are in the vapour phasewhen equilibrium is established ?(Given : Vapour pressure of H,O at 300 K is 3170 Pa;R-8.314JK- mol-)(a) 5.56x 10-3 mol(c) 4.46x 10-2mol(b) 1.53 x 102 mol(d) 1.27x10-3 mol |
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7694. |
A flask containing air (open to atmosphere) isheated from 300 K to 500 K. Then percentage ofair escaped to the atmosphere is(1) 20(3) 6010. Wh(2) 40(4) 80 |
Answer» Assume the flask to have a volume of 1L Since the pressure is kept constant, we have, V1/T1 =V2/T2 V1 = 1L and T1 = 300K, T2 = 500K Therefore V2 = 500/300 =1.66 L i.e. the gas has expanded. Since the volume of the flask can contain only 1L of air the remaining 0.66 L will escape i.e 39.75 % 40% the atmosphere doesn't get heated |
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7695. |
Convert the follouwtng temperatureto celsius scale:a. 300 Kb. 573 K |
Answer» 300K - 273.15 = 26.85 °C573K- 273.15= 299.85°C |
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7696. |
Convert the followingtemperature to celsius scalea. 300 K1.b. 573 K |
Answer» tnx 300K TEMPERATURE IN CELSIUS=(300-273)° =27C°573KTEMPERATURE IN CELSIUS=(573-273)° =300C° |
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7697. |
Go for the reaction-8290.8 cal. The Kc for the reaction 300 K is 10". The value of n is. |
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7698. |
10. An object is placed in front of a convex mirror of radius of curvature 40 cm at a distance of 10 cm. Find the(v 20cm, M 2)position, nature and magnification of mirror |
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7699. |
why is water liquid at room temperature |
Answer» Atroom temperature(anywhere from zero degree centigrade to 100 degrees centigrade),wateris found in aliquid state. This is because of the tiny, weak hydrogen bonds which, in their billions, holdwatermolecules together for small fractions of a second.Water molecules are constantly on the move. hit like if you find it useful |
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7700. |
52. Which of the following mixtures contain less numberof ions?(2) 2M NaCl; 2M KCi(3) 2M MnSO4 2M K,SO4(4) 2M K,S04 2M (NH4) SO4 |
Answer» OPTION 2. is correct NaCl = Na +Cl. , and KCl = K + Cl in this only 2*2+2*2 = 8 ions will be produced , but in all others , no. of ions will be more.. |
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