MCQs on Solutions Chemistry The mole fraction of the solute in one molal aqueous solution is 0.009 0.018 0.027 0.036 Answer: (b) 5 cm3 of acetone is added to 100 cm3 of water, the vapour pressure of water over the solution will be equal to the vapour pressure of pure …
MCQs on Aldehydes, Ketones and Carboxylic Acids A mixture of benzaldehyde and formaldehyde on heating with aqueous NaOH solution gives benzyl alcohol + sodium formate sodium benzoate + methanol benzyl alcohol + methanol sodium benzoate + sodium formate Answer: (1) Which of the following has the most acidic hydrogen? hexane-2,4-dione …
MCQs on Haloalkanes and Haloarenes The reaction of tert butyl bromide with sodium methoxide produces mainly isobutane isobutylene tert-butyl methyl ether sodium tert butoxide Answer: (b) Which of the following undergoes nucleophilic substitution exclusively by SN1 mechanism? Benzyl Chloride Ethyl chloride Chlorobenzene Isopropyl chloride Answer: (a) The increasing order of …
MCQs on D and F Block Elements The number of unpaired electrons in gaseous species of Mn3+, Cr3+ and V3+ respectively are: 4, 4 and 2 3, 3 and 2 4, 3 and 2 3, 3 and 3 Answer: (c) Gun metal is an alloy of: Cu and Al Cu …
MCQs on Surface Chemistry Which one of the following is an example of adsorption? ammonia in contact with water anhydrous CaCl2 with water silica gel in contact with water vapours all of these Answer: (c) At 15oC out of H2, CH4, CO2, NH3, which gas will be adsorbed maximum by …
MCQs on Chemistry in Everyday Life Chloramine-T is an disinfectant antiseptic analgesic antipyretic Answer: (a) Benzalkonium chloride is a cationic surfactant and antiseptic anionic surfactant and soluble in most of the organic solvents cationic surfactant and insoluble in most organic solvents. cationic surfactant and antimalarial Answer: (a) Interferon is connected …
MCQs on Organic compounds containing Nitrogen Acetamide can be converted to methenamine by which of the following reactions? Stephen’s reaction Hoffmann bromamide reaction Carbylamine reaction Gabriel phthalimide synthesis Answer: (b) An aldehyde on reaction with primary amine forms ketone Schiff’s base aromatic acid carboxylic acid Answer: (b) Benzene-diazonium chloride on …
MCQs on Free Energy and Work Function If the standard free energy change for a reaction is 1.546 kJ/mol at 500oC then the value of the standard equilibrium constant for the reaction is antilog (0.105) antilog (-0.105) antilog (0.241) antilog (-0.241) Answer: (b) The standard free energy of formation of …
MCQs on Oxidizing and Reducing Agent Oxygen can be converted into ozone by oxidation at high temperature catalytic oxidation oxidation under high pressure and temperature silent electric discharge Answer: (d) 2 Which of the following statements is not correct? oxygen is neutral to litmus oxygen is not combustible oxygen supports …
MCQs on Redox Reaction and Method for Balancing Redox Reaction Which of the following represents a redox reaction? NaOH + HCl → NaCl + H2O BaCl2 + H2SO4 → BaSO4 + 2HCl CuSO4 + 2H2O → Cu(OH)2 + H2SO3 Zn + 2HCl → ZnCl2 + H2 Answer: (d) Which reaction …
MCQs on Electrovalent Bonding Electrovalent compounds are low melting insoluble in polar solvents conductors in the fused state none of the above Answer: (c) Ionic compounds don’t conduct electricity in solution fused state solid state none of the above Answer: (c) When an element of very low ionization potential reacts …
MCQs on Coordinate or Dative Bonding When two species A and B form an electron-pair bond and A does not provide its electrons for bonding, the bond present between A and B must be ionic covalent dative Hydrogen Answer: (c) Each of the following pairs of chemical species will combine. …
MCQs on Polarisation and Fajans Rule The molecule, which contains sp3d2 and p orbitals overlapping in it is PCl5 BrF5 ClF3 IF7 Answer: (b) Homolytic fission of C-C bond of ethane (C2H6) which gives an intermediate in which carbon atom is sp3 hybridised sp2 hybridised sp hybridised sp3d hybridised Answer: …
MCQs on Hybridisation The compound which contains both ionic and covalent bond: KCl KCN CH4 H2 Answer: (b) The maximum number of 90o angles between bond pair-bond pair of electrons is observed in dsp2 hybridisation sp3d hybridisation dsp3 hybridisation sp3d2 hybridisation Answer: (d) Ether is more volatile than alcohol having …
MCQs on Soil Pollution Which of the following serves as an indicator of atmospheric pollution? fern liverworts hornworts epiphytic lichens Answer: (d) In 1984, the Bhopal gas tragedy took place because methyl isocyanate reacted with ammonia reacted with water reacted with DDT reacted with CO2 Answer: (b) Negative soil pollution …
MCQs on Corrosion Which of the following methods is not used for the prevention of corrosion? greasing painting plating Heating Answer: (d) Widening of a river valley takes place due to corrosion lateral erosion corrasion hydraulic action Answer: (b) Elements which have properties of metals and nonmetals are amorphous crystalline …
MCQs on Hydrogen Electrolysis of brine produces chlorine gas hydrogen gas sodium hydroxide all the above Answer: (d) A reactant containing the element that is oxidised is called reducing agent oxidising agent hydrogen sublime Answer: (a) By losing one or two electrons the atoms of metal are oxidised reduced hydrogenated …
MCQs on Hydrogen Peroxide The structure of hydrogen peroxide is Planar Spherical Linear Non-planar Answer: (d) Fenton’s reagent is Zn + HCl Sn + HCl FeSO4 + H2O2 None Answer: (c) Hydrogen peroxide is oxidising agent reducing agent oxidising as well as reducing None Answer: (c) In the disproportionation Hydrogen peroxide, forming H2O …
MCQs on Equilibrium State Equimolar solutions of the following compounds are prepared separately in water. Which will have the lowest pH value? BeCl2 SrCl2 CaCl2 MgCl2 Answer: (a) Addition of which chemical will decrease the hydrogen ion concentration of an acetic acid solution? NH4Cl Al2(SO4)3 AgNO3 NaCN Answer: (d) In …
MCQs on Law of Equilibrium and Equilibrium Constant Could BF3 acidity be clarified using one of the following concepts? Arrhenius concept Bronsted Lowry concept Lewis concept Bronsted Lowry as well as Lewis concept Answer: (c) What will be the value of pH of 0.01 mol dm-3 CH3COOH (Ka = 1.74 …
MCQs on Le Chatelier Principle and its Application In what manner will increase of pressure affect the following equation C(s) + H2O → CO(g) + H2(g) shift in the reverse direction shift in the forward direction increase in the yield of hydrogen no effect Answer: (a) The equilibrium between water …