10-minute Quiz : Chapter 24

Which of the combinations about the numbers of bond pairs and lone pairs of electrons in the outermost shell of the central phosphorus atom in a PBr₃ molecule is correct?

• A

• B

• C

• D

A covalent compound XY₃ has an octet structure. Its molecules are trigonal pyramidal in shape. Which of the following statements about its molecules are correct?

(1) There is one lone pair of electrons on the X atom.

(2) There are three bond pairs of electrons on the X atom.

(3) The three Y atoms lie on the same plane.

• A. (1) and (2) only

• B. (1) and (3) only

• C. (2) and (3) only

• D. (1), (2) and (3)

Which of the following statements about a CCl₄ molecule is correct?

• A. The central atom does not have an octet structure.
• B. There are four pairs of electrons around the central atom.
• C. There is one lone pair of electrons around the central atom.
• D. It is octahedral in shape.

Which of the following are possible combinations of elements represented by X and Y?

• A. (1) and (2) only

• B. (1) and (3) only

• C. (2) and (3) only

• D. (1), (2) and (3)

Which of the following substances has a non-octet structure?

• A. SiF₄
• B. NF₃
• C. OF₂
• D. AsF₅

Which of the following molecules is NOT linear in shape?

• A. BeCl₂
• B. HCN
• C. CO₂
• D. H₂S

Which of the following molecules is/are planar?

(1) BeH₂

(2) CH₂Br₂

(3) PCl₃

• A. (1) only

• B. (2) only

• C. (1) and (3) only

• D. (2) and (3) only

The electronic arrangements of the atoms of elements X and Y are shown in the table. X reacts with Y to give compound Z with a simple molecular structure. What is the shape of Z?

• A. Trigonal planar

• B. Trigonal pyramidal

• C. Trigonal bipyramidal

• D. Octahedral

Which of the following statements about NH₃ and BF₃ are INCORRECT?

(1) Both of them have non-octet structures.

(2) Both of their molecules have three electron pairs around the central atom.

(3) They have similar molecular shapes.

• A. (1) and (2) only

• B. (1) and (3) only

• C. (2) and (3) only

• D. (1), (2) and (3)

Which of the following pairs of molecules have a similar shape?

(1) CH₃Cl and SiH₄

(2) HCHO and BCl₃

(3) CS₂ and OCl₂

• A. (1) and (2) only

• B. (1) and (3) only

• C. (2) and (3) only

• D. (1), (2) and (3)