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