- 1 FACULTY
OF MEDICINE, MASARYK UNIVERSITY BRNO
Admission test: CHEMISTRY A Year: 2022
1) Select the formula of magnesium disulfite:
a) Mg2S2O4 b) MgS2O7 c) MgS2O6 d) MgS2O5
e) no answer is correct
2) Calculate the mass percentage of oxygen in sodium peroxide, Ar(Na) = 23, Ar(O) = 16.
a) 41.0% b) 30.1% c) 20.5% d) 18.9%
e) no answer is correct
3) Calculate the theoretical volume of water that, upon decomposition, yields one litre of oxygen. Consider
the properties of ideal gas, 0 C and 101.3 kPa. Ar(H) = 1, Ar(O) = 16, density of water = 1.0 g/ml.
a) 89.7 cm3
b) 22.4 dm3
c) 1.6 cm3
d) 44.8 dm3
e) no answer is correct
4) Calculate the mass of one selenium atom. Ar(Se) = 79
a) 1.3 × 10−22
g b) 4.7 × 10−25
g c) 1.5 × 10−20
g d) 3.2 × 10−22
g
e) no answer is correct
5) Radioactive fluorine isotope 18
F contains:
a) 10 protons + 8 neutrons b) 7 protons + 11 neutrons c) 9 protons + 9 neutrons
d) 18 neutrons e) no answer is correct
6) Consider a general equilibrium reaction in gaseous phase [A (g) + 2 B (g) ⇄ C (g) + heat] and select the
correct statement:
a) removing A supports reaction progress from the left to the right
b) adding B supports reaction progress from the right to the left
c) increasing pressure will support the right-to-left reaction
d) decreasing temperature will drive the left-to right reaction course
e) no answer is correct
7) Select the compound that can form hydrogen bonds with water molecules:
a) trichloromethane b) dimethyl sulfide c) ethylamine d) potassium bromide
e) no answer is correct
8) A mouthwash contains 600 ppm of fluoride anion. Calculate the molarity of fluoride.
Ar(F) = 19, density of mouthwash = 1.0 g/ml, ppm = parts per million
a) 31.6 mmol/l b) 31.6 mol/l c) 0.32 mmol/l d) 0.03 mol/l
e) no answer is correct
9) A solution of hydrochloric acid (20%, M = 36.5 g/mol) has the density 1.1 g/ml. Determine the molarity of
HCl.
a) 6.0 mol/l b) 1.3 mol/l c) 3.0 mol/l d) 12.0 mol/l
e) no answer is correct
10) The solution of sulfuric acid (50 ml; 0.1 mol/l) was added to the NaOH solution (40 ml; 0.1 mol/l). How
many per cents of acid was neutralized? Assume an ideal solution and complete dissociation of both
electrolytes.
a) 80% b) 30% c) 45% d) 60%
e) no answer is correct
- 2 -
11) In a sodium phosphate solution, the concentration of cations is 400 mmol/l. Calculate the concentration
of anions. Assume complete dissociation and ideal conditions, do not consider the hydrolysis of ions.
a) 100 mmol/l b) 200 mmol/l c) 400 mmol/l d) 1200 mmol/l
e) no answer is correct
12) Select a weak electrolyte (R = alkyl):
a) R-CO-R b) R-NH2 c) R-NH3
+
Cl−
d) R-CH2-R
e) no answer is correct
13) A solution of nitric acid (M = 63 g/mol) has pH = 2.0 (25 C). Calculate the mass concentration of HNO3.
a) 1.8 g/l b) 3.1 g/l c) 2.5 g/l d) 0.63 g/l
e) no answer is correct
14) Select the salt whose aqueous solution is acidic:
a) KNO2 b) MgCl2 c) Al2(SO4)3 d) NaHCO3
e) no answer is correct
15) Select the true statement on alkali metals:
a) potassium ions (K+
) are the major cations of intracellular fluid
b) hydrated sodium ion [Na(H2O)n]+
exhibits typical properties of a Brønsted acid
c) rubidium ion (Rb+
) has very strong reducing properties
d) natural caesium (Cs) is a radioactive element
e) no answer is correct
16) Select the poorly soluble salt:
a) Ca(HCO3)2 b) MgCO3 c) KHSO4 d) NaClO3 e) no answer is correct
17) Select the redox reaction:
a) CaCO3 → CaO + CO2
b) PCl5 + H2O → POCl3 + 2 HCl
c) 2 CH3-SH + ½ O2 → CH3-S-S-CH3 + H2O
d) [Cu(H2O)4]2+
+ H2O → [Cu(H2O)3OH]+
+ H3O+
e) no answer is correct
18) Find the acyl of a five-carbon carboxylic acid:
a) malonyl b) succinyl c) caproyl d) acetoacetyl e) no answer is correct
19) Select the redox pair (Ared/Aox) corresponding to dehydrogenation (Ared → Aox + 2 H):
a) acetate/acetaldehyde b) propanal/propanone c) glycerol/glyceraldehyde
d) asparagine/aspartate e) no answer is correct
20) Determine the reactions during conversion of compounds A → B → C. The scheme is simplified, does
not comprise all components.
a) dehydrogenation of A is followed by hydration of B
b) the A → B conversion is dehydration, the second reaction is isomerization
c) the first reaction is oxidation, the second conversion is reduction
d) upon hydration of A, the intermediate B undergoes dehydrogenation
e) no answer is correct
A B C
N N
NH
N
H
O
N
H
N
NH
N
H
O
OH N
H
N
NH
N
H
O
O
- 3 -
21) The compound R-CO-CH2-CO-NR2 (R = alkyl) is formed by the reaction of:
a) keto acid + amine b) ketone + amino acid
c) diketone + amine d) keto acid + amino acid
e) no answer is correct
22) Select the correct set of general names for R-CH(OR)OH, R-CO-NH-R, R-S-S-R (R = alkyl):
a) acetal, dipeptide, disulfane b) hemiacetal, amide, disulfide c) ester, aldimine, dithiol
d) ester, azide, disulfate e) no answer is correct
23) Select the compound possessing a centre of chirality:
a) cyclohexylamine b) malic acid c) diethyl succinate d) 2-bromopropane
e) no answer is correct
24) Select the compound corresponding to molecular formula C6H14N2O2:
a) thymine b) alanyl-serine c) lysine d) N,N-dimethylbutanamide e) no answer is correct
25) Select the monocarboxylic acid:
a) maleic b) glutaric c) oxalic d) ascorbic e) no answer is correct
26) Select the correct set of names for the compounds depicted:
a) imidazole, thiolane, pyridine
b) pyrrole, furan, pteridine
c) pyrrolidine, oxolane, pyrimidine
d) pyridine, thiophene, purine
e) no answer is correct
27) Select the compound containing a nitrogen heterocycle:
a) hydroquinone b) aniline c) catechol d) hydroxyproline
e) no answer is correct
28) The compound depicted is:
a) mannose
b) maltose
c) sucrose
d) galactose
e) no answer is correct
29) Select the isomer of glucose:
a) ribose
b) fructose
c) maltose
d) amylose
e) no answer is correct
30) Select the fatty acid that is essential for humans:
a) cis,cis-octadeca-6,9-dienoic acid b) cis,cis-octadeca-9,12-dienoic acid
c) cis,cis-octadeca-15,18-dienoic acid d) cis,cis,cis-octadeca-6,9,12-trienoic acid
e) no answer is correct
N
N
H
S N
N
O
OOH
OH
OH
OH
O
OH
OH
OH
OH
- 4 -
31) Determine the name of the compound depicted:
a) deoxyadenosine b) deoxycytidine
c) deoxyguanosine d) deoxythymidine
e) no answer is correct
32) In replication, deoxynucleotides are attached to a newly synthesized DNA strand. Select the equation
that correctly expresses elongation of the dCdG sequence by dT (Pi = phosphate, PPi = diphosphate):
a) dCdG + dTMP → dCdGdT + H2O
b) dCdG + dTDP → dCdGdT + Pi
c) dCdG + dTTP → dCdGdT + PPi
d) dCdG + dTMP + ATP → dCdGdT + ADP + Pi
e) no answer is correct
33) The compound depicted is formed from:
a) asparagine, valine, methionine
b) glutamine, histidine, threonine
c) lysine, glutamine, isoleucine
d) glutamine, tyrosine, isoleucine
e) no answer is correct
34) Which amino acid has the highest number of positive charges under physiological pH (6.8 – 7.4)?
a) glutamine b) tryptophan c) lysine d) glutamate e) cannot decide unambiguously
35) Select the amino acid with the highest number of carbon atoms:
a) histidine b) tyrosine c) threonine d) arginine e) cannot decide unambiguously
36) The conversion of malate to fumarate is catalysed by:
a) oxidoreductase b) hydrolase c) transferase d) lyase
e) no answer is correct
37) Select the intermediate of glycolysis that undergoes isomerization:
a) phosphoenolpyruvate b) fructose-1,6-bisP c) glyceraldehyde-3-P d) glycerol-3-P
e) no answer is correct
38) R-CO-CH2-CO-S-CoA is an intermediate of β-oxidation of fatty acids. Its further conversion requires:
a) H2O b) NAD+
c) FAD d) CoA-SH e) no answer is correct
39) Identify the vitamin from the following data: molecular formula C12H17N4OS, water soluble, contained
in meat, beans, yeast, whole-meal cereals, derivative of pyrimidine and thiazole, needed for aerobic
catabolism of all nutrients, especially glucose. Its deficit is manifested mainly by various neurological
problems, e. g. irritability and confusion.
a) ascorbate b) thiamine c) phylloquinone d) folate
e) no answer is correct
40) Select the intermediate of citrate cycle that releases carbon dioxide:
a) 2-oxoglutarate b) malate c) citrate d) succinyl-CoA
e) no answer is correct
N
O
OH
OH
N
NH
N
NH2
O
O
O
NH2
NH2
N
O
N
CH3CH3
O
OH
S
CH3
H
H