Chapter 24 - Shapes of molecules (octet + non-octet)

Which of the following simple molecular

substances does NOT obey octet rule?

• SF₆

• PF₃

• CH₃Cl

• CO₂

What is the shape of a CH₂Cl₂ molecule?

• Linear

• Trigonal planar

• Tetrahedral

• Octahedral

Which of the following molecules does NOT have a linear shape?

• CS₂

• HCN

• OF₂

• BeF₂

In which of the following pairs, do the molecules have a similar shape?

• BeCl₂ and Cl₂O

• SCl₂ and CO₂

• BH₃ and NH₃

• BF₃ and HCHO

Which of the following statements about a H₂SO₄ molecule are correct?

(1) It has an octet structure.

(2) It has no lone pair of electrons around the central sulphur atom.

(3) To minimize repulsion between electron pairs, the electron pairs around the central atom take up a tetrahedral arrangement.

• (1) and (2) only

• (1) and (3) only

• (2) and (3) only

• (1), (2) and (3)

Which of the following statements about a H₃PO₄ molecule is/are correct?

(1) It does not obey octet rule.

(2) There is one lone pair of electrons around the central phosphorus atom.

(3) It is planar in shape.

• (1) only

• (2) only

• (1) and (3) only

• (2) and (3) only

Which of the following molecules has a similar shape as H₂O?

• BeF₂

• CO₂

• OCl₂

• NCl₃

To which of the following molecules is the 'octet rule' NOT applicable?

• CO

• O₃

• N₂O

• SO₂

Which of the following molecules is planar?

• NF₃

• BCl₃

• CCl₄

• PF₅