chemistry ONLINE TEST 0% 12th Chemistry One Mark Test – Full Portion Wish you all the Best ! 1 / 70 The geometry at which carbon atom in diamond are bonded to each other is? None of these Octahedral Tetrahedral Hexagonal 2 / 70 Concentration of the Ag⁺ ions in a saturated solution of Ag₂ C₂ O₄ is 2.24 ×10⁻⁴ mol L⁻¹ solubility product of Ag₂ C₂ O₄ is? 2.42 x 10⁻⁸ mol³ L⁻³ 5.619 10⁻¹² mol³ L⁻³ 4.5 x 10⁻¹¹ mol³ L⁻³ 2.66 x 10⁻¹² mol³ L⁻³ 3 / 70 On reacting with neutral ferric chloride, phenol gives? red colour violet colour no colouration dark green colour 4 / 70 Permanganate ion changes to ________ in acidic medium? MnO₂ MnO₄²⁻ Mn³⁺ Mn²⁺ 5 / 70 The rate constant of a reaction is 5.8 × 10ˉ² sˉ¹ . The order of the reaction is? Second order Third order zero order First order 6 / 70 In a protein, various amino acids linked together by? α – Glycosidic bond Dative bond Peptide bond β – Glycosidic bond 7 / 70 While charging lead storage battery? PbSO₄ on anode is reduced to Pb PbSO₄ on cathode is oxidised to Pb PbSO₄ on cathode is reduced to Pb PbSO₄ on anode is oxidised to PbO₂ 8 / 70 A magnetic moment of 1.73BM will be shown by one among the following? [CoCl₆]⁴⁻ [ Ni (CN)₄]²⁻ TiCl₄ [ Cu (NH₃)₄]²⁺ 9 / 70 Which of the metal is extracted by Hall-Heroult process? Cu Al Zn Ni 10 / 70 Which one of the following characteristics are associated with adsorption? ΔG, ΔH and ΔS all are negative ΔG and ΔHare negative but ΔS is positive ΔGand ΔS are negative but ΔH is positive ΔG is negative but ΔH and ΔS are positive 11 / 70 Most easily liquefiable gas is? Kr Ar He Ne 12 / 70 If the initial concentration of the reactant is doubled, the time for half reaction is also doubled. Then the order of the reaction is? Fraction One None Zero 13 / 70 Which one given below is a non-reducing sugar? Glucose maltose Lactose. Sucrose 14 / 70 What is the activation energy for a reaction if its rate doubles when the temperature is raised from 200K to 400K? (R = 8.314 JKˉ¹molˉ¹)? 334.65 J molˉ¹Kˉ¹ 434.65 kJ molˉ¹Kˉ¹ 234.65 kJ molˉ¹Kˉ¹ 2.305 kJ molˉ¹ 15 / 70 What is the pH of the resulting solution when equal volumes of 0.1M NaOH and 0.01M HCl are mixed? 2.0 7.0 12.65 3 16 / 70 Which one of the following will not undergo Hofmann bromamide reaction? CH₃ CONHCH₃ CH₃ CONH₂ CH₃ CH₂ CONH₂ C₆ H₅ CONH₂ 17 / 70 In acid medium, potassium permanganate oxidizes oxalic acid to? oxalate acetate Carbon dioxide acetic acid 18 / 70 Which of the following compounds on reaction with methyl magnesium bromide will give tertiary alcohol? methyl propanoate propanoic acid acetaldehyde benzaldehyde 19 / 70 The vacant space in bcc lattice unit cell is ? 32% 23% 48% 26% 20 / 70 The phenomenon observed when a beam of light is passed through a colloidal solution is? Electrophoresis Cataphoresis Tyndall effect Coagulation 21 / 70 The magnetic moment of Mn²⁺ ion is? 2.80BM 5.92BM 8.95BM 3.90BM 22 / 70 Which of the following fluro compounds is most likely to behave as a Lewis base? PF₃ SiF₄ CF₄ BF₃ 23 / 70 Which one of the following statements related to lanthanons is incorrect? All the lanthanons are much more reactive than aluminium. The basicity decreases as the ionic radius decreases from Pr to Lu. Ce⁴⁺ solutions are widely used as oxidising agents in volumetric analysis. Europium shows +2 oxidation state. 24 / 70 Oxidation state of Iron and the charge on the ligand NO in [Fe (H₂O)₅ NO] SO₄ are? +3 and 0 respectively +2 and 0 respectively +3 and -1 respectively +1 and +1 respectively 25 / 70 Boric acid is an because its molecule? Accepts OH- from water,releasing proton. Gives up a proton Contains replaceable H+ ion Combines with proton to form water molecule 26 / 70 Which of the following d block element has half filled penultimate d sub shell as well as half filled valence sub shell? Pt Cr None of these Pd 27 / 70 An elements belongs to group 15 and 3 rd period of the periodic table, its electronic configuration would be? 1s² 2s² 2p⁶ 3s² 3p³ 1s² 2s² 2p³ 1s² 2s² 2p⁴ 1s² 2s² 2p⁶ 3s² 3p² 28 / 70 The formation of cyanohydrin from acetone is an example of? electrophilic substitution electrophilic addition Nucleophilic addition nucleophilic substitution 29 / 70 Wolframite ore is seprated from tinstone by the process of? Smelting Roasting Calcination Electromagnetic separation 30 / 70 The addition of a catalyst during a chemical reaction alters which of the following quantities? Enthalpy Activation energy Entropy Internal energy 31 / 70 Which one of the following is an example for homogeneous catalysis? hydrogenation of oil manufacture of ammonia by Haber’s process Hydrolysis of sucrose in presence of dil HCl manufacture of sulphuric acid by contact process 32 / 70 Which of the following metals has the largest abundance in the earth’s crust? Calcium Aluminium Sodium Magnesium 33 / 70 Graphite and diamond are ? both molecular crystals ionic and covalent crystals both covalent crystals Covalent and molecular crystals 34 / 70 Zinc can be coated on iron to produce galvanized iron but the reverse is not possible. It is because? Zinc has lower negative electrode potential than iron Zinc has higher negative electrode potential than iron Zinc is lighter than iron Zinc has lower melting point than iron 35 / 70 Electrochemical process is used to extract? Silver Lead Iron Sodium 36 / 70 Carbolic acid is? benzoic acid phenylacetic acid Phenol Picric acid 37 / 70 Which of the following compound can be used as artifreeze in automobile radiators? methanol ethanol Neopentyl alcohol ethan -1, 2-diol 38 / 70 Which one of the following rotates the plane polarized light towards left? L(+) Glucose D(+) Glucose D(+) Galactose D(-) Fructose 39 / 70 The decomposition of phosphine (PH₃) on tungsten at low pressure is a first order reaction. It is because the? rate is inversely proportional to the surface coverage rate of decomposition is slow rate is independent of the surface coverage rate is proportional to the surface coverage 40 / 70 Which of the following is not SP2 hybridised? Fullerene Graphite Graphene Dry ice 41 / 70 Which of the following is incorrect for physisorption? increases with increase in surface area reversible low heat of adsorption increases with increase in temperature 42 / 70 Which one of the following reduces tollens reagent? none of these formic acid acetic acid benzophenone 43 / 70 Cupellation is a process used for the refining of? Silver Lead Copper Iron 44 / 70 Which one of the following undergoes reaction with 50% sodium hydroxide solution to give the corresponding alcohol and acid? ethanal ethanol Phenylmethanal methanol 45 / 70 The sum of primary valance and secondary valance of the metal M in the complex [ M(en)₂ (Ox) ] Cl is L? 3 -3 9 6 46 / 70 Faradays constant is defined as? charge carried by 1 electron charge carried by 6.22 ×10¹⁰ electrons. charge carried by one mole of electrons charge required to deposit one mole of substance 47 / 70 The product formed by the reaction an aldehyde with a primary amine? aromatic acid carboxylic acid schiff ’s base ketone 48 / 70 Nitrobenzene on reaction with Con HNO₃ / H₂ SO₄ at 80-100⁰C forms which one of the following products? 2,4,6 – tirnitrobenzene 1,3 – dinitrobenzene 1,2 – dinitrobenzene 1,4 – dinitrobenzene 49 / 70 Oxidation state of carbon in its hybrides? +4 +3 +2 -4 50 / 70 Secondary nitro alkanes react with nitrous acid to form? red solution yellow solution green solution blue solution 51 / 70 The ratio of close packed atoms to tetrahedral hole in cubic packing is? 1 : 4 1 : 2 1 : 1 2 : 1 52 / 70 Which one of the following is the strongest acid? 4 – chlorophenol 2 – nitrophenol 4 – nitrophenol 3 – nitrophenol 53 / 70 In aqueous solution of amino acids mostly exists in? NH2-CH(R)-COOH H3N+-CH(R)-COOH H3N+-CH(R)-COO- NH2-CH(R)-COO 54 / 70 Conjugate base for Bronsted acids H₂ O and HF are? OH⁻ and H₂ FH⁺ , respectively H₃O⁺ and H₂ F⁺ , respectively H₃ O⁺ and F⁻ , respectively OH⁻ and F⁻ , respectively 55 / 70 Which one of the following compounds is not formed? XeOF₄ NeF₂ XeO₃ XeF₂ 56 / 70 Which of the following reagent can be used to convert nitrobenzene to aniline? ZnHg / NaOH Zn/NH₄Cl All of these Sn / HCl 57 / 70 The central dogma of molecular genetics states that the genetic information flows from? DNA → Carbohydrates → Proteins Amino acids → Protein → DNA DNA → RNA → Carbohydrates DNA → RNA → Proteins 58 / 70 Solid CO₂ is an example of ? metallic solid Covalent solid molecular solid ionic solid 59 / 70 Among the following, which is the strong gest oxidizing agent? F₂ Cl₂ Br₂ I₂ 60 / 70 The reagent used to distinguish between acetaldehyde and benzaldehyde is? Tollens reagent 2,4 – dinitrophenyl hydrazine semicarbazide Fehling’s solution 61 / 70 Which one of the following will give a pair of enantiomorphs? [Pt(NH₃)₄] [PtCl₄] [Cr(NH₃)₆] [Co(CN)₆] [Co(NH₃)₄ Cl₂] NO₂ [Co(en)₂ Cl₂] Cl 62 / 70 An excess of silver nitrate is added to 100ml of a 0.01M solution of pentaaquachloridochromium(III)chloride. The number of moles of AgCl precipitated would be? 0.2 0.02 0.01 0.002 63 / 70 During electrolysis of molten sodium chloride, the time required to produce 0.1mole of chlorine gas using a current of 3A is? 55 minutes 330 minutes 220 minutes 107.2 minutes 64 / 70 The number of electrons that have a total charge of 9650 coulombs is? 6.022 x 10²² 6.022 x 10⁻³⁴ 6.022 x 10²⁴ 6.22 x 10²³ 65 / 70 Collodion is a 4% solution of which one of the following compounds in alcohol – ether mixture? Cellulose acetate Nitrocellulose Nitroglycerine Glycoldinitrate 66 / 70 Which one of the following reaction is an example of disproportionation reaction? cannizaro reaction Benzoin condensation none of these Aldol condensation 67 / 70 In calcium fluoride, having the fluorite structure the coordination number of ion and Ion are? 4 and 8 8 and 4 4 and 2 6 and 6 68 / 70 On hydrolysis, PCl₃ gives? H₃ PO₄ H₃ PO ₃ PH₃ POCl ₃ 69 / 70 The correct statement regarding RNA and DNA respectively is? the sugar component in RNA is ribose and the sugar component in DNA is 2’-deoxyribose the sugar component in RNA is 2’-deoxyribose and the sugar component in DNA is arabinose the sugar component in RNA is an arabinos and the sugar component in DNA is ribose the sugar component in RNA is an arabinose and the sugar component in DNA is 2’-deoxyribose 70 / 70 In the extraction of aluminium from alumina by electrolysis, cryolite is added to? Decrease the electrical conductivity Remove impurities from alumina Increase the rate of reduction Lower the melting point of alumina Your score is Note: Once you start the test, you are not allowed to go back. Results won’t be generated if you quit the test. Complete the test within the given time. Once the time is over, the test will be submitted automatically. You can verify your answers at the result page.