10-minute Quiz : Chapter 25 Polarity of bond and molecule

Which of the following correctly arranges the elements in increasing order of electronegativity?

• A. S < Si < Mg < Na
• B. Mg < Si < S < Mg
• C. Si < Mg < Na < S
• D. Na < Mg < Si < S

Which of the following elements has the highest electronegativity?

• A. F
• B. He
• C. Ne
• D. Na

Which of the diagrams correctly indicates the polarity of a CH₃F molecule?

• A

• B

• C

• D

Consider the following statements and choose the best answer:

1st statement

The electronegativity of Group I elements increases down the group.

2nd statement

The reactivity of Group I elements increases down the group.

• A. Both statements are true and the 2nd statement is a correct explanation of the 1st statement.

• B. Both statements are true but the 2nd statement is NOT a correct explanation of the 1st statement.

• C. The 1st statement is false but the 2nd statement is true.

• D. Both statements are false.

Which of the following covalent bonds is the least polar?

• A. H−N
• B. H−C
• C. H−Cl
• D. H−O

Boron trifluoride molecules are non-polar because

• A. they do not have polar bonds.
• B. they are planar.
• C. the B-F bonds are arranged symmetrically in space.
• D. the electronegativity difference between boron and fluorine is small.

Which of the diagrams best represents the shape and the bond polarities in a PCl₃ molecule?

• A

• B

• C

• D

Which of the following molecules is/are polar?

(1) NF₃

(2) PBr₅

(3) CH₃Cl

• A. (1) only

• B. (2) only

• C. (1) and (3) only

• D. (2) and (3) only

When a negatively charged rod is placed near a jet of liquid running out from a burette, the jet of liquid does NOT show any deflection. Which of the following may the liquid be?

(1) Ethanol

(2) Cyclohexane

(3) Tetrachloromethane

• A. (1) and (2) only

• B. (1) and (3) only

• C. (2) and (3) only

• D. (1), (2) and (3)

In which of the following molecules do the underlined atoms have a partial negative charge?

(1) NH₃

(2) OF₂

(3) CH₃Cl

• A. (1) and (2) only

• B. (1) and (3) only

• C. (2) and (3) only

• D. (1), (2) and (3)