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