chemistry MCQs – Page 24

Practise multiple-choice questions from chemistry for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemistry Mcqs
461. Saponification is the hydrolysis of fat or oil with an__________________?
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A. Enzyme and acid

B. Alkali

C. Enzyme and alkali

D. Acid

462. Animal and vegetable fats are___________________?
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A. Triesters formed from glycerol and fatty acids

B. Tetraesters formed from glycerol and fatty acids

C. Fatty acids

D. Glycerols

463. Rate of enzymatic reaction is directly proportional to the concentration of___________________?
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A. Substrate

B. Enzyme and substrate

C. Enzyme and product

D. Enzyme

464. The specific rate constant of a first order reaction depends on the________________?
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A. Temperature

B. Concentration of the product

C. Concentration of the reactant

D. Time

465. When light is exposed to transition element then electrons jump from lower orbitals to higher orbitals in______________________?
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A. orbitals of f-subshell

B. orbitals of d-subshell

C. orbitals of p-subshell

D. both A & B
466. K2 (Cu(CN)4) which one is correct___________________?
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A. Potassium tetra cyano cupperate

B. Ligand is positively charged

C. Central atom is present in avionic sphere

D. Co-ordination number is 2

467. Purines and pyrimidines are__________________?
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A. Lipids

B. Enzymes

C. Nitrogenous bases

D. Carbohydrates

468. The important monomers of acryclic resins is__________________?
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A. Vinyl chloride

B. Styrene

C. Methylmethacrylate

D. Hexamethylenediamine

469. Potential of SHE is considered as__________________?
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A. multiple of 1

B. constant

C. unity

D. zero
470. In the production of wrought iron Mg Si and P are removed in the form of___________________?
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A. silicates

B. oxides

C. carbonates

D. slag
471. Negative log of mular concentration of H+ ions is called___________________?
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A. pKw

B. pOH

C. pH

D. pKa

472. The element that act as anode always have ______________ position in electrochemical cell?
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A. in middle

B. no effect of position

C. lower

D. higher
473. Ozone hole is substantial depletion of ozone in every year during__________________?
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A. Aug Nov

B. Sep Nov

C. Dec Jan

D. Nov Dec

474. Energy of activation for backward reaction is less than forward reaction for ___________ reactio?
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A. Moderate

B. Exothermic

C. Endothermic

D. Fast

475. Compounds attracted by applied strong magnetic field are called__________________?
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A. ferromagnetic

B. paramagnetic

C. good conductor

D. diamagnetic

476. With impurities like P and S the open hearth furnace is lined with ?
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A. FeO

B. Fe2O3

C. CaO MgO

D. SiO2

477. When the central atom of coordination compound is sp3d2 hybridization the expected geometry will be___________________?
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A. tetrahedral

B. trigonal bipyramidal

C. square planar

D. octahedral
478. Which of the following gases is the main cause of acid rain ?
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A. CO

B. NO2

C. both a & b

D. none of the above

479. Conversion of reactant into product in unit time is called________________?
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A. rate of backward reaction

B. rate of forward reaction

C. rate constant

D. rate co-efficient

480. Anything which increases rate of reaction without being involved in the reaction________________?
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A. Inhibitor

B. Promoter

C. Catalyst

D. All of the above