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Plovdiv Entrance Exam Tested Questions With Revised Correct Detailed Answers >Latest Update>>Plovdiv Entrance Exam Tested Questions With Revised Correct Detailed Answers >Latest Update>>

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Uploaded on November 20, 2024
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Type Exam (elaborations)
Contains Questions & answers

plovdiv
plovdiv entrance
metals
acids
chem
chemistry
temperature
plovdiv entrance exam tested questions with revi

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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 solutions has a freezing point closest to 0oC

A) 0.010 mol/L CuSO4

B) 0.010 mol/L CH3COOH

C) 0.010 mol/L FeCl3

D) 0.010 mol/L Na2SO4 - ANSWER 0.010 mol/L CuSO4

3. What are constitutional isomers? - ANSWER same molecular formula but different connectivity

4. All of the following are true of aluminum except:

A) it is good conductor of electricity

B) it is a metal of high density

C) it is a good reducing agent

D) its hydroxide is soluble in both, strong base and acid - ANSWER not a high density metal

,5. Which of the following equations represents a condensation reaction?

A) CH3CH2CH3 + Br2 → CH3CH2CH2Br + HBr

B) CH3CH = CH2 + HBr → CH3−CH2−CH2Br

C) CH3CH2COOH + NaOH → CH3CH2COONa + H2O

D) CH3COOH + CH3CH2OH → CH3COOCH2CH3 + H2O - ANSWER C) CH3CH2COOH + NaOH →
CH3CH2COONa + H2O

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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Exam (elaborations)

Plovdiv Entrance Exam Tested Questions With Revised Correct Detailed Answers >Latest Update>>Plovdiv Entrance Exam Tested Questions With Revised Correct Detailed Answers >Latest Update>>

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