PLOVDIV ENTRANCE TEST 2024-2025
The mass number and atomic number of the lithium atom are shown by
the symbol 3 7 Li. What is the correct symbol for the lithium-ion in lithium
chloride?
A) 2 6 Li-
B) 3 6 Li+
C) 3 7 Li+
D) 3 7 Li- - ANSWER C) 3 7 Li+
All of the following can act as Brønsted-Lowry acid (proton donors) in
aqueous solution except:
A) HI
B) HCO3 -
C) H2S
D) NH3 - ANSWER D) NH3
All of the following statements about carbon dioxide are true except:
A) it can be prepared by the action of acid on limestone
B) it is used to extinguish fires
C) it dissolves in water at room temperature
D) it sublimes rather than melts at 20°C and 1 atmosphere pressure -
ANSWER D
Which of the options will form the major product ?
- primary carbocation
- secondary carbocation
- tertiary carbocation - ANSWER - TERTIARY CARBOCATION
BECAUSE IT IS MORE STABLE
True or false , alcohols do not react with NaOH ? - ANSWER true , they
do not react with NaOH and thus no salt is formed
Which of the reaction shown below involves the formation of an ionic
precipitate from a solution?
A) Ca2+ + CO3 CaCO3
, B) HCO3 - + H+ H2CO3
C) Fe + Cu2+ Fe2+ + Cu
D) CaCO3 + H2CO3 Ca(HCO3)2 - ANSWER A ; because a precipitate
is formed when a cation and an anion react.
Given the following process that has reached equilibrium: NaCl (s)-><-
NaCl (aq). For the phase equilibrium to exist, the NaCl (aq) must be a
solution that is:
A) concentrated
B) saturated
C) supersaturated
D) unsaturated - ANSWER B ; Since only a saturated solution would
mean that there is a balance in concentrations in the system
Glucose and fructose are:
A) enantiomers
B) functional isomers
C) tautomers
D) chain isomer - ANSWER Functional Isomers
Which of the following is an observable property of many acids?
A) they become slippery when reacting with water
B) they react with metals to release hydrogen gas
C) they produce salts when mixed with other acids
D) they become more acidic when mixed with a base - ANSWER B
All of the native α-amino acids can react with the reagents below except:
A) NaOH
B) FeCl3
C) HCl
D) glycine - ANSWER B
For the system at equilibrium 2 SO2 (g) + O2 (g) 2 SO3 (g) + heat,
decreasing the temperature increases the number of moles of which of
the following when equilibrium is reestablished?
A) SO3 (g)
B) O2 (g)
C) SO2 (g)
The mass number and atomic number of the lithium atom are shown by
the symbol 3 7 Li. What is the correct symbol for the lithium-ion in lithium
chloride?
A) 2 6 Li-
B) 3 6 Li+
C) 3 7 Li+
D) 3 7 Li- - ANSWER C) 3 7 Li+
All of the following can act as Brønsted-Lowry acid (proton donors) in
aqueous solution except:
A) HI
B) HCO3 -
C) H2S
D) NH3 - ANSWER D) NH3
All of the following statements about carbon dioxide are true except:
A) it can be prepared by the action of acid on limestone
B) it is used to extinguish fires
C) it dissolves in water at room temperature
D) it sublimes rather than melts at 20°C and 1 atmosphere pressure -
ANSWER D
Which of the options will form the major product ?
- primary carbocation
- secondary carbocation
- tertiary carbocation - ANSWER - TERTIARY CARBOCATION
BECAUSE IT IS MORE STABLE
True or false , alcohols do not react with NaOH ? - ANSWER true , they
do not react with NaOH and thus no salt is formed
Which of the reaction shown below involves the formation of an ionic
precipitate from a solution?
A) Ca2+ + CO3 CaCO3
, B) HCO3 - + H+ H2CO3
C) Fe + Cu2+ Fe2+ + Cu
D) CaCO3 + H2CO3 Ca(HCO3)2 - ANSWER A ; because a precipitate
is formed when a cation and an anion react.
Given the following process that has reached equilibrium: NaCl (s)-><-
NaCl (aq). For the phase equilibrium to exist, the NaCl (aq) must be a
solution that is:
A) concentrated
B) saturated
C) supersaturated
D) unsaturated - ANSWER B ; Since only a saturated solution would
mean that there is a balance in concentrations in the system
Glucose and fructose are:
A) enantiomers
B) functional isomers
C) tautomers
D) chain isomer - ANSWER Functional Isomers
Which of the following is an observable property of many acids?
A) they become slippery when reacting with water
B) they react with metals to release hydrogen gas
C) they produce salts when mixed with other acids
D) they become more acidic when mixed with a base - ANSWER B
All of the native α-amino acids can react with the reagents below except:
A) NaOH
B) FeCl3
C) HCl
D) glycine - ANSWER B
For the system at equilibrium 2 SO2 (g) + O2 (g) 2 SO3 (g) + heat,
decreasing the temperature increases the number of moles of which of
the following when equilibrium is reestablished?
A) SO3 (g)
B) O2 (g)
C) SO2 (g)
