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CHEMISTRY MCQS
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Questions in this quiz (51)
1Name theheterocyclic
ring. Which vitamins
contain this ring in their
structure?- APyridine, Vitamin B6
- Bvitamin b 7
2Which of the statements is true for the given redox
pairs E0Zn2+/Zn= - 0,76 V E0Cu2+/Cu=+ 0,34V- ACu2+is the better oxidant and in a reaction with Zn2+, it will be reduced to Cu0
- BCu2+ is the better oxidant and in a reaction with Zn0, it will be reduced to Cu0
- CZn2+is the better oxidant and in areaction with Cu0, it will be reduced to Zn0
- DZn0
is the better oxidant and in a reaction with Cu2+, it will be oxidized to Zn2+
3What does apoenzymemean?
- Aenzyme taking part in apoptosis
- Bnon-protein part of the enzyme
- Cprotein part of the enzyme
- Denzyme having non protein part
4Pyruvic acid and α-Ketoglutaric acid are
- Aα-ketocarboxylic acids
- Bketocarboxylic acids
- Chydrocarboxylic acids
- Dß- ketocarboxylic acids
5Fill in the missing words in regards tothegiven
compound.
The structure represents a 1 alcohol. It can
react with 2, to produce salts. It cannot react
with 3, to form the latter.- A1 tertiary (name: 2 methyl 2 butanol)
- B2 sodium
- C3 potassium
6What type of reaction is represented with the next equation? How
- Aesterification cause it shifts to the left to decrease the concentration of HCOOC2H5
- Besterification cause it shifts to the RIGHT
7Nucleoside is a structure that contains
- Aalfa-ribose and nitrogen base linked with 1-4 glycosidic bond
- Bbeta ribose and nitrogen base linked with glycosidic bond
- Calfa-ribose and nitrogen base linked with 1-2 glycosidic bond
- Dalfa-ribose and nitrogen base linked with 1-3 glycosidc bond
8The secondary structure of proteins is sustained by hydrogen bonds and a polypeptide chain exists as
- Adouble helix
- Bα - helix
- Clipoprotein
- Dquaternary structure
9Which is the false statement for the reaction?
- AThe equation represents direct deamination of serine
- BThe equation represents transamination of serine
- CPyruvic acid is the final product of the reaction
- DAmmonia is released as a product
10Which is the correct order by increasing acidity of the following compounds:
- A1-propanol, 2-propanol, glycerol, phenol
- B2-propanol, 1-propanol, glycerol, phenol
- Cphenol, glycerol, 1-propanol, 2-propanol
- Dglycerol, phenol, 2-propanol, 1-propanol
11Carboxylic acids react with
- ACu, alcohols, aldehydes and carbohydrates
- Balkali metals, alcohols, amines and amides
- Calkali metals, thioalcohols, ammonia and PCl3
- DCu, ketones, PCl5 and triacylglycerols
12Lactic acid reacts with
- Aa) 2-aminopropane, 2-propanol, 2-pentanone
- B2-propanol, 1-aminopropane, acetanhydride
- C2-aminopropane, 2-propanol, HNO2
- D2-aminopropane, 2-propanol, NaCl
13Which test can be used to prove presence of methionine in a polypeptide chain?
- Alead-sulfide reaction
- Blegals test
- Cninhydrin reaction
- Dbiuret test
14The reactions that are common for amino acids and amines are
- Areactions with aldehydes, acylation and neutralization
- Breactions with aldehydes, alkylation andesterification
- Creactions with HBr, acylation and decarboxylation
- Dreactions with HBr, acylation and alkylation
15For propanal, ethanal and glyceraldehyde is possible
- Aundergo oxidation with Fehling’s reagent and aldol reaction
- Bundergo oxidation with Fehling’s reagent and Cannizzaro reaction
- Cundergo oxidation with Fehling’s reagent and decarboxylation reaction
- Dundergo oxidation with Fehling’s reaction and deamination reaction
16Which is the correct statement?
- Aaccording to Bronsted-Lowry base is an atom or ion having free electron orbital
- Baccording to Bronsted-Lowry base is an atom or ion having free electron pair
- Caccording to Bronsted-Lowry base is an atom or ion which can accept a proton
- Daccording to Bronsted-Lowry base is an atom or ion which can donatea proton
17Which of the following statements is false?
- AChelates are complexes which involve multidentate ligands
- BSalycylic acid and glycerol are multidentate ligands
- CMultidentate ligands form more than one coordination bond withthe central metal
ion - DChelates are multidentate ligands
18Which is the correct expression for the ion product constant of water a) Kw =[H+]/[OH-
- AKw = [OH-] . [H+]
- BKw = pH + pOH
- CpKw = [H+] . [OH-]
19The reaction of primary alkyl amine with HNO2 produces
- AUnstable diazonium salt that decomposes to nitrosoamine and hydrogen
- BStable diazonium salt, nitrosoamine and hydrogen
- CUnstable diazonium salt that decomposes to alcohol and hydrogen
- DStable diazonium salt, alcohol and hydrogen
20Ascorbic acid, CoQH2 and cytochrome-Fe2+
- Aare buffers in the human body
- Bare reduced forms of the corresponding redox pairs
- Care oxidized forms of the corresponding redox pairs
- Denzymes
21Normality shows
- Athe number of moles of equivalents of the solute per 1000 mL of solution
- Bthe percent of equivalents of solute in 1000 mL of solvent
- Cthe number of equivalents of the solute per 1000mLofsolution
- Dthe percent of the solute in100 g or100mL solution or solvent
22Triacylglycerols
- Aare a class of lipids that are esters of glycerol and stearic acid
- Bare a class of lipids that contain glycerol residue and fatty acid residue as structural
units - Care a class of lipids considered derivatives of isoprene
- Daren’t lipids, they are heterocyclic compounds
23The activation energy is
- AHeat that is released during the reaction
- BHeat that is absorbed during the reaction
- CEnergy which is stored in ATP
- DEnergy that must be overcome in order for a chemical reaction to occur
24Vitamin A, Vitamin K and vitamin E are
- Aterpenes
- Bsteroids
- Csphingophospholipids
- Dglycerophospholipids
25Which of the following are biopolymers?
- Amaltose, starch, heparine
- Bsucrose, glucose, ribose
- Cglycogen, hyaluronic acid, amilose
- Dheparine, sucrose, amylose
26Which acid/base pair can serve as a buffer?
- AHClO4/ClO4-
- BNaH2PO4/K2HPO4
- CHCl/Cl-
- DNaOH/OH-
27For an acid pKa is 2,75. What is the pKb of its conjugate base?
- A10-2,75
- B10-11,25
- C-log 2,75
- D11,25
28Creatinuria is an abnormal condition in which
- Athere is excessive creatine in the urine
- Bthere is excessive creatinine in the urine
- Cthere is excessive phosphocreatine in the urine
- Dthere is excessive phosphocreatinine in the urine
29Competitive inhibitors
- Abind with some site other than active site
- Bbind with enzyme-substrate complex and form complex which is catalytically
inactive - Cbind tightly to the active site
- Dform a complex in equilibrium with the enzyme thus substrate cannot be as rapidly
converted to product
30pH of a solution of strong base is 9,5. What is the concentration on H+ in this solution?
- Athere aren’t any hydrogen ions
- B[H+] = 1.10-9,5
- C[H+] = 1.10-4,5
- D[H+] = 1.109.5
31What is the chemical structure of insulin?
- Aa lipid connecting with peptide
- Ba peptide connecting with sugar
- Ca mono-chain peptide
- Dtwo chain peptide with disulphide bridges
32Which pair represents positional isomers?
- A2-pentanone and 3-pentanone
- B2-butanone and 3-butanone
- Cbutanal and 2-methylpropanal
- Dpentanal and 2-pentanone
33The isoionic point (the isoionic pH) of the peptide
- Ais the pHat which the concentration of the zwitterions is maximum
- Bis the pHat which the concentration of the zwitterions is minimum
- Cis the pH at which the net charge is positive
- Dthere is not a correct answer
34Rhodopsin is
- Aa product of condensation reaction between retinol and opsin and has an imine bond
- Ba product of condensation reaction between retinal and opsin and has an amide bond
- Ca product of condensation reaction between retinol and opsin and has an amide bond
- Da product of condensation reaction between retinal and opsin and has an imine bond
35Monosaccharides form
- Astructural isomers – enantiomers, epimers and anomers
- Bgeometrical isomers – enantiomers, epimers and anomers
- Cstereo isomers – enantiomers, epimers and anomers
- Dfunctional group isomers – enantiomers, epimers and anomers
36Whichof thefollowing is the correct expressionfor Kst of K2[HgI4] ? a) Kst=
- AKst=[K+].[[HgI4]4-] / [[HgI4]4-]
- BKst = [[HgI4]2-] / [Hg2+].[I-]4
- CKst = [[HgI4]2-] / [Hg2+].[K+]2
- DKst = [Hg2+].[K+] / [[HgI4)2-]
37Which vitamins serve as coenzymes?
- Avitamin C, vitamin B1and vitamin K
- Bvitamin B1, vitamin H and vitamin K
- Cvitamin B6, vitamin A and vitamin K
- Dvitamin B1, vitamin B6 and vitamin B 12
38Phenol and salicylic acid form chelates with Fe3+. The colour of these chelates
- Ais purple
- Bis red
- Cone is purple the other is red
- Dboth are colorless
39Which of the statements is true for the redox pair FAD/FADH2:
- AIt takes part in the dehydrogenation of fatty acids
- BIt is involved in the dehydrogenation of ethanol to ethanoic acid
- CVitamin B3 is part of this redoxpair
- DFADH2 is the oxidized form of thispair
40Which of the following statements are true for trimethyl amine:
- Ait is a stronger base compared to ethylamine, and will react with HNO2
- BIt is a weaker base compared to ethylamine, and will react with HNO2
- CIt is a stronger base compared to ethylamine and will not react with HNO2
- DIt is a weaker base compared to ethylamine and will not react with HNO2
41Reaction between two molecules alfa-glucose produces
- Asucrose, which is a reducing sugar
- Blactose, which is a nonreducing sugar
- Camylose, which is a reducing sugar
- Dmaltose, which is a reducing sugar
42Salcylic acid forms
- Athree positional isomers
- Btwo positional isomers
- Cdoesn’t form positional isomers
- Dtwo enantiomers
43Lyases
- Aare enzymes that catalyse non-hydrolytic addition or removal of groups
- Bare enzymes that catalyse synthesis of one large molecule from two smaller
molecules - Care enzymes that catalyse the hydrolysis of esters, glycosidic bonds in carbohydrates,
and peptide bonds in proteins - Dare enzymes that catalyse addition or removal of hydrogen
44Aldosterone is
- Amineral corticoid, causes kidney tubules to reabsorb Na+, Cl- and HCO3-
- Ba male sexhormone
- Ca female sex hormone
- Dbiogenic amine
45Which of the following statements is true:
- AImidazole is a 5 membered ring present in the structure of tryptophan
- BIndole is a fused ring present in the structure of the alkaloid papaverine
- CIndole is a fused ring present in the structure of tryptophan
- DImidazole is a 5 membered ring present in the structure of antipyretics
46Stability constant of the [Cu(NH3)4]
2+ is 2.2x1013 and this one ofthe [Cu(CN)4]
2- is
5x1028. Which complex ion gives in water lower concentration of Cu2+?- A[Cu(NH3)4]2+ because it is more stable
- B[Cu(NH3)4]2+ because it is less stable
- C[Cu(CN)4]2- because it is more stable
- D[Cu(CN)4]2- because it is less stable
47Choose the aldehyde that would participate in the Cannizzaro reaction
- A2,2 - dimethylbutanal
- B2 - methylbutanal
- C2,3 - dimethylbutanal
- D3,3 - dimethylbutanal
48The name methyl salicylate is referred to
- Aan acid chloride of salicylic acid
- Ba salt of salicylic acid
- Can ester of salicylic acid formed with its hydroxyl group
- Dan ester of salicylic acid formed with its carboxyl group
49Caffeine is a central nervous system stimulator and it has as structural unit
- Aquinoline
- Bimidazole
- Cpurine
- Disoquinoline
50Arrhenius equation gives the relation between the rate constant and activation
energy and temperature. According to the equation:
log k = A – Ea/2,3.R.T- Arate constant is directly proportional to the activation energy
- Brate constant is directly proportional to the temperature
- Crate constant is reversely proportional to the activation energy and temperature
- Drate constant is directly proportional to the activation energy and temperature
51Which of the following fatty acids is natural?
- ACH3-(CH2)13-CH2-COOH
- BCH3-(CH2)14-CH2-COOH
- CCH3-(CH2)16-CH2-COOH
- DCH3-(CH2)18-CH2-COOH
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- Quiz on CHEMISTRY MCQS, created by Arisha khan on 04/06/2022.
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