MCQs on Metals and Non-metals Which of the following metals is the most abundant in the earth’s crust? (a) Al (b) Fe (c) Na (d) Ca Answer: (a) Which of the following is a poor conductor of heat among the given metals? (a) Sodium (b) Calcium (c) Lead (d) Mercury …
MCQs on Amines In this reaction acetamide is converted to methanamine (a) Gabriel phthalimide synthesis (b) Carbylamine reaction (c) Stephen’s reaction (d) Hoffmann bromamide reaction Which of the following is true for the basicity of amines? (a) Alkylamines are generally less basic than arylamines because N is sp hybridised (b) …
MCQs on Molecular Orbital Theory Which among the following has the shortest C-C bond length? (a) Ethene (b) Ethane (c) Benzene (d) Ethyne The oxygen molecule is paramagnetic. It can be explained by (a) Resonance (b) Hybridisation (c) Valence bond theory (d) Molecular orbital theory Find the paramagnetic species (a) …
MCQs on Some Basic Concepts of Chemistry Elements X and Y combine to form two compounds XY and X2Y. Find the atomic weight of X and Y, if the weight of 0.1 moles of XY is 10g and 0.05 moles of X2Y is 9g (a) 30, 20 (b) 80, 20 …
MCQs on Chemical Bonding and Molecular Structure C-O bond length is minimum in (a) CO2 (b) CO32- (c) HCOO– (d) CO Answer: (d) Molecules are held together in a crystal by (a) hydrogen bond (b) electrostatic attraction (c) Van der Waal’s attraction (d) dipole-dipole attraction Answer: (c) Sp3d2 hybridization is …
MCQs on Periodic Classification of Elements Find the successive elements of the periodic table with ionisation energies, 2372, 520 and 890 kJ per mol respectively (a) Li, Be, B (b) H, He, Li (c) B, C, N (d) He, Li, Be Answer: (d) In the modern periodic table, the number …
MCQs on Chemical Equilibrium Find the pH of a solution when 0.01 M HCl and 0.1 M NaOH are mixed in equal volumes (a) 12.65 (b) 1.04 (c) 7.0 (d) 2.0 Answer: (a) Which of the following aqueous solution will be the best conductor of electricity? (a) NH3 (b) CH3COOH …
MCQs on States of Matter A container with a pin-hole contains equal moles of H2(g) and O2(g). Find the fraction of oxygen gas escaped at the same time when one-fourth of hydrogen gas escapes (a) 1/16 (b) 1/4 (c) 1/2 (d) 1/8 Answer: (a) What are the conditions for gas …
MCQs on Organic Chemistry Which is the best-suited method for the separation of para and ortho-nitrophenols from 1:1 mixture? (a) crystallisation (b) chromatography (c) sublimation (d) steam distillation Answer: (d) Find the incorrect statement for a nucleophile (a) A nucleophile is a Lewis acid (b) Nucleophiles do not seek electron …
MCQs on Environmental Chemistry Photochemical smog normally does not contain (a) Chlorofluorocarbons (b) Peroxyacetyl nitrate (c) Ozone (d) Acrolein Answer: (a) Depletion of the ozone layer is caused due to (a) Ferrocene (b) Fullerenes (c) Freons (d) Polyhalogens Answer: (c) Find the incorrect statement (a) BOD value of clean water …
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 …