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