{"id":35590,"date":"2024-02-19T06:13:21","date_gmt":"2024-02-19T00:43:21","guid":{"rendered":"https:\/\/www.aplustopper.com\/?p=35590"},"modified":"2024-02-19T11:47:11","modified_gmt":"2024-02-19T06:17:11","slug":"plus-one-chemistry-model-question-papers-paper-3","status":"publish","type":"post","link":"https:\/\/www.aplustopper.com\/plus-one-chemistry-model-question-papers-paper-3\/","title":{"rendered":"Plus One Chemistry Model Question Papers Paper 3"},"content":{"rendered":"

Plus One Chemistry Model Question Papers Paper 3 are part of Plus One Chemistry Previous Year Question Papers and Answers<\/a>. Here we have given Plus One Chemistry Model Question Papers Paper 3.<\/p>\n\n\n\n\n\n\n
Board<\/strong><\/td>\nSCERT<\/td>\n<\/tr>\n
Class<\/strong><\/td>\nPlus One<\/td>\n<\/tr>\n
Subject<\/strong><\/td>\nChemistry<\/td>\n<\/tr>\n
Category<\/strong><\/td>\nPlus One Previous Year Question Papers<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Plus One Chemistry Model Question Papers Paper 3<\/h2>\n

Time Allowed: 2 hours
\nCool off time: 15 Minutes
\nMaximum Marks: 60<\/p>\n

General Instructions to candidates<\/strong><\/p>\n

    \n
  • There is a \u2018cool off time\u2019 of 15 minutes in addition to the writing time.<\/li>\n
  • Use the \u2018cool off time\u2019 to get familiar with questions and to plan your answers.<\/li>\n
  • Read the instructions carefully.<\/li>\n
  • Read questions carefully before answering.<\/li>\n
  • \u00a0Calculations, figures and graphs should be shown in the answer sheet itself.<\/li>\n
  • Malayalam version of the questions is also provied.<\/li>\n
  • Give equations wherever necessary.<\/li>\n
  • Electronic devices except non programmable calculators are not allowed in the Examination Hall.<\/li>\n<\/ul>\n

    \"Plus<\/p>\n

    Answer all questions from question numbers 1 to 7. Each carry one score.
    \n\"Plus<\/p>\n

    Question 1:
    \nThe number of protons, electrons and neutrons in a species are equal to 17, 18 and 18 respectively. Which of the following will be the proper symbol of this species?
    \n\"Plus<\/p>\n

    Question 2:
    \nOne-half of the difference between the number of electrons in the bonding and antibonding molecular orbitals is called …………
    \n\"Plus<\/p>\n

    Question 3:
    \nName the phenomenon behind cleansing action of soap.
    \n\"Plus<\/p>\n

    Question 4:
    \nName the process used for the industrial preparation of sodium carbonate,
    \n\"Plus<\/p>\n

    Question 5:
    \nIn the Lassaigne\u2019s test for halogens, they are precipitated as ……………….
    \n\"Plus\"Plus<\/p>\n

    Question 6:
    \nWrite the name of any one salt responsible for the permanent hardness of water.
    \n\"Plus<\/p>\n

    Question 7:
    \nGive the IUPAC name of the following compound: CH3<\/sub>CH2<\/sub>COCH2<\/sub>CH2<\/sub>COOH
    \n\"Plus<\/p>\n

    Answer any ten from question numbers 8 to 20. Each carries two scores.
    \n\"Plus<\/p>\n

    Question 8:
    \nClassify the following into intensive and extensive properties.
    \ni. Internal energy
    \nii. Density
    \niii. Heat capacity
    \niv. Temperature.
    \n\"Plus<\/p>\n

    Question 9:
    \nGiven the redox reaction:
    \nCuO (s) + H2<\/sub> (g) \u2192 Cu (s) + H2<\/sub>0 (g)
    \ni. Identify the species which undergo reaction and which undergo oxidatlon.1
    \nii. Identify the reductant and oxidant in the above reaction.
    \n\"Plus
    \n\"Plus<\/p>\n

    Question 10:
    \nMatch the following :
    \n\"Plus<\/p>\n

    Question 11:
    \nGive the IUPAC name of the following compounds.
    \n\"Plus<\/p>\n

    Question 12:
    \nGive the name of the modified form of ideal gas equation and write down it.
    \n\"Plus<\/p>\n

    Question 13:
    \nCarbon has many allotropes.
    \na. Write the name of any two allotropic forms of carbon.
    \nb. CCl4<\/sub> does not undergo hydrolysis. Give a reason.
    \n\"Plus<\/p>\n

    Question 14:
    \ni. Give the Arrhenius concept about acids and bases.
    \nii. Give one example each for Arrhenius acid and base.
    \n\"Plus<\/p>\n

    Question 15:
    \nWhen Sodium metal dissolves in liquid ammonia, it gives a deep blue coloured solution. Explain the reason.
    \n\"Plus<\/p>\n

    Question 16:
    \nA neondioxygen mixture contains 70.6 g dioxygen and 167.5 g neon. If the pressure of the mixture of gases in the cylinder is 25 bar, what are the partial pressures of O2<\/sub> and neon in the mixture?
    \n\"Plus<\/p>\n

    Question 17:
    \nWrite the difference between extensive and intensive properties. Give one example of each.
    \n\"Plus<\/p>\n

    Question 18:
    \nFluorine reacts with ice as given below.
    \nH2<\/sub>O(s) + F2<\/sub>(g) \u2192 HF (g) + HOF (g)
    \nJustify that this is a redox reaction.
    \n\"Plus<\/p>\n

    Question 19:
    \na. H2<\/sub>O2<\/sub> is a bleaching agent. Why?
    \nb. Complete the following reaction?
    \nZn (s) + NaOH (aq) \u2192 …………………..
    \n\"Plus<\/p>\n

    Question 20:
    \nComplete the following chemical reactions:
    \n\"Plus<\/p>\n

    Answer any seven from question numbers 21 to 29. Each carries three scores.
    \n\"Plus<\/p>\n

    Question 21:
    \nIn redox reactions, oxidation and reduction occur simultaneously.
    \na. How are oxidation and reduction related
    \nto the oxidation number?
    \nb. During a group discussion, one of your friends argues that thermal decomposition of KC\/O3<\/sub> is a redox reaction while that of CaCO3<\/sub> is not a redox reaction. Give your opinion and substantiate.
    \n\"Plus
    \n\"Plus<\/p>\n

    Question 22:
    \nGive the IUPAC names of the following compounds:
    \n\"Plus<\/p>\n

    Question 23:
    \nWhen some sodium acetate is added to a solution of acetic acid, the concentration of unionzed acetic acid increases.
    \na. What is the phenomenon involved? Substantiate.
    \nb. Consider the equilibrium,
    \n\"Plus
    \nThe solubility of AgCl is 1.06 x 10-5<\/sup> mol\/L at 298 K. Find out its Ksp<\/sub> at this temperature.
    \nc. What happens to the value of solubility and solubility product when HCI is passed through an AgCl solution?
    \n\"Plus
    \n\"Plus<\/p>\n

    Question 24:
    \nAtmospheric pollution increases the global average temperature and the phenomenon is called global warming.
    \na. What are the major gases which contribute towards global warming?
    \nb. What can we do to reduce global warming?
    \n\"Plus<\/p>\n

    Question 25:
    \nThe solubility product of Al(OH)3<\/sub> is 1 x 1036<\/sup> Calculate the solubility of Al(OH)3<\/sub>
    \n\"Plus<\/p>\n

    Question 26:
    \nAccount for the following :
    \ni. Ionization enthalpy of Nitrogen is greater than that of Oxygen.
    \nii. 2nd<\/sup> period elements show anomalous behaviour.
    \n\"Plus<\/p>\n

    Question 27:
    \na. Give any two factors influencing the formation of an ionic bond.
    \nb. Give the shape of the following species.
    \ni. NH4<\/sub>+<\/sup>
    \nii. HgCl2<\/sub>
    \n\"Plus<\/p>\n

    Question 28:
    \nRedox reactions can be considered as electron transfer reactions. In an experiment a copper rod is dipped in AgNO3<\/sub> solution.
    \na. What happens to the colour of the solution and why?
    \nb. Identify the oxidizing and reducing agent in this reaction.
    \nc. Calculate the oxidation number of Cr in
    \nK2<\/sub>Cr2<\/sub>O7<\/sub> and P in H2<\/sub>P2<\/sub>O5<\/sub>.
    \n\"Plus<\/p>\n

    Question 29:
    \na. 1-alkynes are weakly acidic in nature.
    \nGive any two reactions to showthe acidic character of ethyne.
    \nb. From the following, select the one in which Markownikoffs rule is best applicable.
    \n\"Plus
    \n\"Plus<\/p>\n

    Answer any three from question numbers 30 to 33. Each carries four scores.
    \n\"Plus<\/p>\n

    Question 30:
    \nThe enthalpy change in a process is the same, whether the process is carried out in a Single step or in several steps.
    \na. Identify the law stated here. 1
    \nb. Calculate the enthalpy of formation of CH4 from the following data:
    \n\"Plus<\/p>\n

    Question 31:
    \na. When nitrogen and hydrogen combines to form ammonia, the ratio between the volumes of gaseous reactants and products is 1:3:2. Name the law of chemical combination illustrated here.
    \nA compound is made up of two elements A and B, has A= 70%, B= 30%. The relative number of moles of A andB in the compound are 1.25 and 1.88 respectively. If the molecular mass of the compound is 160, find the molecular of the compound.
    \n\"Plus<\/p>\n

    Question 32:
    \nPhenol exhibit resonance.
    \ni. Draw the resonance structures of phenol.
    \nii. Predict the directive influence of -OH group in Benzene ring.
    \n\"Plus<\/p>\n

    Question 33:
    \na. Hydrogen peroxide restore the colour of lead paintings. Give a reason.
    \nb. How does the atomic hydrogen torch function for cutting and welding purposes?
    \n\"Plus<\/p>\n

    Answers<\/p>\n

    Answer 1:
    \n\\(_{ 17 }^{ 35 }{ Cl }\\)<\/p>\n

    Answer 2:
    \nBond order<\/p>\n

    Answer 3:
    \nSurface tension.<\/p>\n

    Answer 4:
    \nSolvay process.<\/p>\n

    Answer 5:
    \nSilver halides.<\/p>\n

    Answer 6:
    \nCaCl2<\/sub> or MgSO4<\/sub><\/p>\n

    Answer 7:
    \n\"Plus<\/p>\n

    Answer 8:
    \nExtensive properties: Internal energy, Heat capacity.
    \nIntensive properties: Density, Temperature.<\/p>\n

    Answer 9:
    \ni. Reduction species – CuO
    \nOxidation species – H2<\/sub>
    \nii. Reductant- H2<\/sub>, Oxidant – CuO<\/p>\n

    Answer 10:
    \n\"Plus<\/p>\n

    Answer 11:
    \n11. i. 3 – chloropropanal
    \nii. 3 – methylpentanenitrite.<\/p>\n

    Answer 12:
    \nThere is deviation from ideal behaviour at high pressure and low temperaure. This is due to two faulty assumptions in kinetic theory of gases. It is corrected by van der Waal\u2019s equation.
    \n\"Plus
    \nwhere n is the number of moles of the gas a and b are van der Waal’s constants.<\/p>\n

    Answer 13:
    \na. Diamond, graphite, fullerene
    \nb. This is due to the absence of vacant d- orbitals in carbon.<\/p>\n

    Answer 14:
    \ni. Acid is a substance which dissociate to give H+<\/sup> ion in aqueous solution. Base is a substance which dissociate to give OH–<\/sup> ion in aqueous solution.
    \nii. HCl, H2<\/sub>SO4<\/sub>, CH3<\/sub>COOH etc are acids which give free H+<\/sup> ions in aqueous solution.<\/p>\n

    Answer 15:
    \nBlue colour H2<\/sub> gas is evolved during the process. If M is alkali metal.
    \n\"Plus
    \nBlue colour due to the ammoniated electron which absorbs energy.
    \n\"Plus<\/p>\n

    Answer 16:
    \n\"Plus<\/p>\n

    Answer 17:
    \nExtensive – Depends on the quantity of matter, eg., internal energy, heat capacity enthalpy volume, mass etc.
    \nIntensive – Does not depend on the quantity of matter, eg., Density, S.T.P, T, etc.<\/p>\n

    Answer 18:
    \nOxidation number of fluorine decreases in HF while the oxidation no. of fluorine in-creases in HOF. So it is a redox reaction.<\/p>\n

    Answer 19:
    \na. H2<\/sub>O2<\/sub> decomposes to release nascent oxygen that oxidises the colouring matter to colourless.
    \nb. Zn(s)+2NaOH(aq) \u2192 Na2<\/sub>ZnO2<\/sub>(aq) +H2<\/sub>(q)
    \n\"Plus<\/p>\n

    Answer 20:
    \n\"Plus<\/p>\n

    Answer 21:
    \na.Oxidation is a process which involves an increase in oxidation number of an element.
    \nReduction is a process which involves a decrease in oxidation number of an element.
    \nIMG
    \nThe reaction (1) is a redox reaction because there is a change in oxidation state. But (2) is not a redox reaction because there is no change in oxidation state.<\/p>\n

    Answer 22:
    \na. 5, 5 -dimethyl heptan – 2 – ol
    \nb. 2 – pentanone
    \nc. 2, 4, 6 – tribromophenol.<\/p>\n

    Answer 23:
    \na. Common ion effect. It the suppression of dissociation of weak electrolyte
    \n(CH3<\/sub>COOH) by addition of a salt containing common ion (CH3<\/sub>COONa).
    \nIMG
    \nc. When HCI gas is passed through AgCl solution. Solubility of AgCI decreases while the solubility product does not change.<\/p>\n

    Answer 24:
    \na. CO2<\/sub>, methane, chlorofluoro carbons etc are the major gases which contribute to- wards global warming.
    \nb. 1. Minimise the use of automobiles.
    \n2. Plant more trees.
    \n3. Avoid burning of dry leaves, wood.<\/p>\n

    Answer 25:
    \n\"Plus
    \n\"Plus<\/p>\n

    Answer 26:
    \ni. because of the half filled electronic configuration of N. (N = 1s2<\/sup> 2s2<\/sup> 2p3<\/sup>)
    \nii. due to their small size, high electrone gativity and ionisation enthalpy,large charge\/radius ratio and due to the absence of vacant d-orbitals.<\/p>\n

    Answer 27:
    \na. Low ionisation enthalpy of the electropositive atom (metal atom).
    \nHigh negative electron gain enthalpy of the electronegative atom (non-metal atom)
    \nHigh lattice enthalpy of the ionic compound formed.
    \ni. NH4<\/sup>+<\/sup> – Tetrahedral
    \nii. HgCl2<\/sup> – Linear<\/p>\n

    Answer 28:
    \na. The solution becomes blue colour due to the formation of Cu2+<\/sup> ions.
    \nb. Ag+<\/sup> (AgNO3<\/sub>) is the oxidising agent and Cu is the reducing agent.
    \nc. Oxidation number of Cr in K2<\/sub>Cr2<\/sub>O7<\/sub> is +6 and P in H2<\/sub>P2<\/sub>O5<\/sub> is +4.<\/p>\n

    Answer 29:
    \na. Ethyne reacts with sodium ethynide and liberate H2<\/sub>. It reacts with sodamide (NaNH2<\/sub>) to form sodium ethynide and liberate ammonia.
    \n\"Plus<\/p>\n

    Answer 30:
    \n\"Plus
    \n\"Plus<\/p>\n

    Answer 31:
    \na. Gay – Lussac\u2019s law of Gaseous volumes
    \nb. The relative number of moles means % \/ atomic mass<\/p>\n\n\n\n\n\n
    Element<\/strong><\/td>\n%<\/strong><\/td>\nRelative\u00a0no.of\u00a0moles<\/strong><\/td>\nSimple ratio<\/strong><\/td>\nSimplest\u00a0whole\u00a0no.ratio<\/strong><\/td>\n<\/tr>\n
    A<\/td>\n70<\/td>\n1.25<\/td>\n1.25\/1.25= 1<\/td>\n2<\/td>\n<\/tr>\n
    B<\/td>\n30<\/td>\n1.88<\/td>\n1.88\/1.25 = 1.5<\/td>\n3<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    Empirical formula is A2<\/sub>B2<\/sub>
    \nAtomic mass of A = % \/ no.of moles = 70 \/ 1.25 = 56
    \nAtomic mass of B = % \/ no.of moles = 30\/ 1.88 = 15.96
    \nSo, emp. Formula mass = 56 x 2 + 15.96 x 3 = 159.88 = 160
    \nn = mol. mass \/ emp.Formula mass = 160\/160 = 1
    \nMolecular formula = (emp.Formula)n = (A2<\/sub>B3<\/sub>)X 1 = A2<\/sub>B3<\/sub><\/p>\n

    Answer 32:
    \n\"Plus
    \nii. -OH group is an ortho-para directing group.<\/p>\n

    Answer 33:
    \na. This is due to the oxidising action of H2<\/sub>O2<\/sub>.
    \n\"Plus
    \nb. Here H atoms are allowed to recombine on the surface to be welded to generate the temperature of 4000K.<\/p>\n

    We hope the Plus One Chemistry Model Question Papers Paper 3 help you. If you have any query regarding Plus One Chemistry Model Question Papers Paper 3, drop a comment below and we will get back to you at the earliest.<\/p>\n","protected":false},"excerpt":{"rendered":"

    Plus One Chemistry Model Question Papers Paper 3 are part of Plus One Chemistry Previous Year Question Papers and Answers. Here we have given Plus One Chemistry Model Question Papers Paper 3. Board SCERT Class Plus One Subject Chemistry Category Plus One Previous Year Question Papers Plus One Chemistry Model Question Papers Paper 3 Time […]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[42728],"tags":[],"yoast_head":"\nPlus One Chemistry Model Question Papers Paper 3 - A Plus Topper<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.aplustopper.com\/plus-one-chemistry-model-question-papers-paper-3\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Plus One Chemistry Model Question Papers Paper 3\" \/>\n<meta property=\"og:description\" content=\"Plus One Chemistry Model Question Papers Paper 3 are part of Plus One Chemistry Previous Year Question Papers and Answers. 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Here we have given Plus One Chemistry Model Question Papers Paper 3. 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