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 One Zero Fraction 2 / 70 A magnetic moment of 1.73BM will be shown by one among the following? [CoCl₆]⁴⁻ [ Ni (CN)₄]²⁻ [ Cu (NH₃)₄]²⁺ TiCl₄ 3 / 70 Which one of the following is an example for homogeneous catalysis? manufacture of sulphuric acid by contact process manufacture of ammonia by Haber’s process Hydrolysis of sucrose in presence of dil HCl hydrogenation of oil 4 / 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 5 / 70 The sum of primary valance and secondary valance of the metal M in the complex [ M(en)₂ (Ox) ] Cl is L? 9 3 -3 6 6 / 70 Which of the following compounds on reaction with methyl magnesium bromide will give tertiary alcohol? acetaldehyde methyl propanoate benzaldehyde propanoic acid 7 / 70 On hydrolysis, PCl₃ gives? H₃ PO ₃ H₃ PO₄ POCl ₃ PH₃ 8 / 70 Cupellation is a process used for the refining of? Copper Silver Lead Iron 9 / 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 is independent of the surface coverage rate of decomposition is slow rate is inversely proportional to the surface coverage 10 / 70 Permanganate ion changes to ________ in acidic medium? MnO₂ Mn³⁺ MnO₄²⁻ Mn²⁺ 11 / 70 The geometry at which carbon atom in diamond are bonded to each other is? Octahedral None of these Hexagonal Tetrahedral 12 / 70 The rate constant of a reaction is 5.8 × 10ˉ² sˉ¹ . The order of the reaction is? zero order Third order Second order First order 13 / 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 0.2 0.002 0.02 14 / 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] 15 / 70 Which of the following metals has the largest abundance in the earth’s crust? Calcium Aluminium Sodium Magnesium 16 / 70 In aqueous solution of amino acids mostly exists in? H3N+-CH(R)-COOH NH2-CH(R)-COO NH2-CH(R)-COOH H3N+-CH(R)-COO- 17 / 70 Which of the metal is extracted by Hall-Heroult process? Cu Zn Ni Al 18 / 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 19 / 70 The ratio of close packed atoms to tetrahedral hole in cubic packing is? 1 : 2 1 : 1 1 : 4 2 : 1 20 / 70 On reacting with neutral ferric chloride, phenol gives? no colouration red colour violet colour dark green colour 21 / 70 Wolframite ore is seprated from tinstone by the process of? Roasting Calcination Smelting Electromagnetic separation 22 / 70 The formation of cyanohydrin from acetone is an example of? Nucleophilic addition nucleophilic substitution electrophilic addition electrophilic substitution 23 / 70 The product formed by the reaction an aldehyde with a primary amine? aromatic acid ketone carboxylic acid schiff ’s base 24 / 70 Which one of the following compounds is not formed? XeO₃ XeF₂ NeF₂ XeOF₄ 25 / 70 Collodion is a 4% solution of which one of the following compounds in alcohol – ether mixture? Nitroglycerine Glycoldinitrate Nitrocellulose Cellulose acetate 26 / 70 In the extraction of aluminium from alumina by electrolysis, cryolite is added to? Remove impurities from alumina Increase the rate of reduction Lower the melting point of alumina Decrease the electrical conductivity 27 / 70 What is the pH of the resulting solution when equal volumes of 0.1M NaOH and 0.01M HCl are mixed? 3 12.65 7.0 2.0 28 / 70 Which one of the following reaction is an example of disproportionation reaction? Benzoin condensation Aldol condensation cannizaro reaction none of these 29 / 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 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 30 / 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 -1 respectively +2 and 0 respectively +3 and 0 respectively 31 / 70 In acid medium, potassium permanganate oxidizes oxalic acid to? oxalate acetate acetic acid Carbon dioxide 32 / 70 Which one of the following reduces tollens reagent? acetic acid none of these formic acid benzophenone 33 / 70 Solid CO₂ is an example of ? molecular solid Covalent solid ionic solid metallic solid 34 / 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 2p⁶ 3s² 3p² 1s² 2s² 2p⁶ 3s² 3p³ 1s² 2s² 2p³ 35 / 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 36 / 70 The reagent used to distinguish between acetaldehyde and benzaldehyde is? semicarbazide Fehling’s solution 2,4 – dinitrophenyl hydrazine Tollens reagent 37 / 70 Graphite and diamond are ? both molecular crystals Covalent and molecular crystals ionic and covalent crystals both covalent crystals 38 / 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 39 / 70 Carbolic acid is? Picric acid phenylacetic acid benzoic acid Phenol 40 / 70 Most easily liquefiable gas is? Kr Ar He Ne 41 / 70 The vacant space in bcc lattice unit cell is ? 32% 26% 48% 23% 42 / 70 In calcium fluoride, having the fluorite structure the coordination number of ion and Ion are? 8 and 4 4 and 2 6 and 6 4 and 8 43 / 70 Which one of the following statements related to lanthanons is incorrect? The basicity decreases as the ionic radius decreases from Pr to Lu. Europium shows +2 oxidation state. Ce⁴⁺ solutions are widely used as oxidising agents in volumetric analysis. All the lanthanons are much more reactive than aluminium. 44 / 70 Which of the following compound can be used as artifreeze in automobile radiators? ethan -1, 2-diol ethanol Neopentyl alcohol methanol 45 / 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 334.65 J molˉ¹Kˉ¹ 234.65 kJ molˉ¹Kˉ¹ 434.65 kJ molˉ¹Kˉ¹ 46 / 70 Nitrobenzene on reaction with Con HNO₃ / H₂ SO₄ at 80-100⁰C forms which one of the following products? 1,3 – dinitrobenzene 1,4 – dinitrobenzene 1,2 – dinitrobenzene 2,4,6 – tirnitrobenzene 47 / 70 The central dogma of molecular genetics states that the genetic information flows from? DNA → RNA → Carbohydrates DNA → Carbohydrates → Proteins DNA → RNA → Proteins Amino acids → Protein → DNA 48 / 70 Which one of the following undergoes reaction with 50% sodium hydroxide solution to give the corresponding alcohol and acid? methanol Phenylmethanal ethanal ethanol 49 / 70 While charging lead storage battery? PbSO₄ on cathode is oxidised to Pb PbSO₄ on anode is oxidised to PbO₂ PbSO₄ on anode is reduced to Pb PbSO₄ on cathode is reduced to Pb 50 / 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 51 / 70 The addition of a catalyst during a chemical reaction alters which of the following quantities? Internal energy Enthalpy Entropy Activation energy 52 / 70 Which of the following fluro compounds is most likely to behave as a Lewis base? PF₃ SiF₄ CF₄ BF₃ 53 / 70 Oxidation state of carbon in its hybrides? +4 -4 +2 +3 54 / 70 Conjugate base for Bronsted acids H₂ O and HF are? H₃ O⁺ and F⁻ , respectively OH⁻ and F⁻ , respectively H₃O⁺ and H₂ F⁺ , respectively OH⁻ and H₂ FH⁺ , respectively 55 / 70 Secondary nitro alkanes react with nitrous acid to form? yellow solution green solution blue solution red solution 56 / 70 The number of electrons that have a total charge of 9650 coulombs is? 6.022 x 10⁻³⁴ 6.022 x 10²² 6.022 x 10²⁴ 6.22 x 10²³ 57 / 70 Which of the following reagent can be used to convert nitrobenzene to aniline? Sn / HCl All of these Zn/NH₄Cl ZnHg / NaOH 58 / 70 Which one given below is a non-reducing sugar? Sucrose Lactose. maltose Glucose 59 / 70 Among the following, which is the strong gest oxidizing agent? I₂ Br₂ F₂ Cl₂ 60 / 70 Which of the following is not SP2 hybridised? Graphite Fullerene Dry ice Graphene 61 / 70 Electrochemical process is used to extract? Sodium Silver Iron Lead 62 / 70 The phenomenon observed when a beam of light is passed through a colloidal solution is? Coagulation Tyndall effect Electrophoresis Cataphoresis 63 / 70 Boric acid is an because its molecule? Combines with proton to form water molecule Contains replaceable H+ ion Accepts OH- from water,releasing proton. Gives up a proton 64 / 70 The magnetic moment of Mn²⁺ ion is? 3.90BM 8.95BM 2.80BM 5.92BM 65 / 70 Which one of the following will not undergo Hofmann bromamide reaction? CH₃ CH₂ CONH₂ C₆ H₅ CONH₂ CH₃ CONH₂ CH₃ CONHCH₃ 66 / 70 Which one of the following is the strongest acid? 3 – nitrophenol 2 – nitrophenol 4 – chlorophenol 4 – nitrophenol 67 / 70 Which one of the following characteristics are associated with adsorption? ΔG and ΔHare negative but ΔS is positive ΔG, ΔH and ΔS all are negative ΔGand ΔS are negative but ΔH is positive ΔG is negative but ΔH and ΔS are positive 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 1 electron charge carried by 6.22 ×10¹⁰ electrons. 69 / 70 Which one of the following rotates the plane polarized light towards left? L(+) Glucose D(-) Fructose D(+) Glucose D(+) Galactose 70 / 70 In a protein, various amino acids linked together by? Dative bond Peptide bond β – Glycosidic bond α – Glycosidic bond 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.