Plovdiv Entrance Exam
Tested Questions With Revised
Correct Detailed Answers
>Latest Update>>
1. A carbonyl group is present in all of these functional groups except
A) ketones
B) aldehydes
C) esters
D) ethers - ANSWER
ethers
2. Which of the following dilute soluti...
6. 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+
7. Which substance has a polar covalent bond between its atoms?
A) NaH
B) NaCl
C) F2
D) NH3 - ANSWER NH3
8. Which of following changes will increase rate of reaction for CH4 + Br2 = CH3Br + Hbr
A) increasing the concentration of Br2
B) decreasing the concentration of CH4
C) increasing the concentration of HBr
D) decreasing the temperature - ANSWER A) increasing the concentration of Br2
9. Which of the metals does not react with diluted H2SO4?
A) Cu
B) Ni
, C) Mg
D) Cr - ANSWER in case of copper Copper is below hydrogen in the reactivity series. This means that
copper is less reactive than hydrogen and hence cannot displace it from the acidic solution.
10. Peptides are:
A) products of amino acids polymerization
B) polyamides of amino acids
C) polyesters of amino acids
D) salts obtained after neutralization of amino groups with carboxylic groups of amino acids - ANSWER
B) polyamides of amino acids
11. Which of the following dilute solutions has the lowest pH?
A) 0.010 mol/L HCl
B) 0.010 mol/L NaOH
C) 0.010 mol/L CH3COOH
D) 0.010 mol/L NH4OH - ANSWER 0.010 mol/L HCl
12. 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
13. 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
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