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