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