MCQs on Alkane Which of the following conformation of n-butane is the most stable? (a) eclipsed (b) gauche (c) staggered (d) skew boat Find the correct order for relative energies of the ethane conformations (a) staggered < skewed < eclipsed (b) skewed < staggered < eclipsed (c) skewed < eclipsed …
CHEMISTRY MCQs
MCQs on Alkene Which of the following compounds react most readily with Br(g)? (a) C2H2 (b) C3H6 (c) C2H4 (d) C4H10 When propene reacts with HBr in the presence of peroxide, it gives rise to (a) allyl bromide (b) isopropyl bromide (c) n-propyl bromide (d) 3-bromopropane Find the alkene with …
MCQs on Half-Life How many milligrams of tritium will remain after 49.2 years if the starting amount is 32 mg? The half-life of tritium is 12.3 years. (a) 8 mg (b) 2 mg (c) 1 mg (d) 4 mg Find the half-life of 614C if ???? is 2.31 x 10-4. …
MCQs on Acid-Base Titration What is the molarity of the solution of barium hydroxide, if 35 ml of 0.1 M HCl is used in the titration of 25 ml of the barium hydroxide solution? (a) 0.35 (b) 0.07 (c) 0.28 (d) 0.14 Answer: (b) Which of the following titrations will …
MCQs on Acid Rain The main contributors of acid rain are (a) sulphur oxides and carbon oxides (b) nitrogen oxides and sulphur oxides (c) carbon dioxide and carbon monoxide (d) nitrogen oxides and carbon oxides Answer: (b) Who coined the term acid rain? (a) Christ Ralph (b) Elmer Joseph Clark …
MCQs on Distillation A mixture of o-nitrophenol and p-nitrophenol can be separated by (a) crystallisation (b) chromatography (c) sublimation (d) steam distillation Answer: (d) The commonly used method to separate naphthalene from benzoic acid is (a) sublimation (b) crystallisation (c) distillation (d) chromatography Answer: (a) This is not separated by …
MCQs on Sucrose The phenomenon of mutarotation is not exhibited by (a) (–) Fructose (b) (+) Lactose (c) (+) Maltose (d) (+) Sucrose Answer: (d) Invert sugar is produced on hydrolysis of (a) fructose (b) dextrose (c) sucrose (d) glucose Answer: (c) The sweetest sugar is (a) sucrose (b) fructose …
MCQs on Crystal Field Theory Which of the following complexes shows zero crystal field stabilization energy? (a) [Co(H2O)6]3+ (b) [Fe(H2O)6]3+ (c) [Co(H2O)6]2+ (d) [Mn(H2O)6]3+ Answer: (b) Which of the following is paramagnetic? (a) [CoBr]42- (b) Mo(Co)6 (c) [Pt(en)Cl2] (d) [Co(NH3)6]3+ Answer: (a) For a high spin d4 octahedral complex the …
MCQs on Fatty Acid Catabolism The free fatty acids are transported by blood associated with (a) β -lipoprotein (b) a fatty acid-binding protein (c) albumin (d) none of the above Answer: (c) Where are the enzymes for β-oxidation present? (a) Nucleus (b) Cytosol (c) Mitochondria (d) Golgi apparatus Answer: (c) …
MCQs on Colloidal Dispersion Fog is an example of which type of colloidal system? (a) Gas in liquid (b) Solid in gasLiquid in gas (c) Gas in gas (d) Liquid in gas Answer: (b) Which of the following properties of colloids does not depend on the charge on particles? (a) …
MCQs on Catalyst and Catalysis Which of the following is incorrect for a catalyst? (a) Bio-chemical reactions are mostly catalysed by enzymes (b) Catalyst does not start a reaction (c) Catalyst changes the equilibrium constant of a reaction (d) Co-enzymes increase the activity of an enzyme Answer: (c) How does …
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 …