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IB Chemist

IB Chemistry Revision Questions - Topic 3 & 13 (Periodicity) & Topic 4 & 14 (Bonding)

1. What is the best description of the carbon-oxygen bond lengths in CO32- ?

A. One short and two long bonds B. One long and two short bonds

C. Three bonds of the same length D. Three bonds of different lengths

2. Element X is in group 2, and element Y in group 7, of the Periodic Table. Which ions will be present in the compound formed when X and Y react together ?

A. X + and Y B. X 2+ and Y

C. X + and Y 2– D. X 2– and Y +

3. According to VSEPR theory, repulsion between electron pairs in a valence shell decreases in the order:

A. lone pair-lone pair > bond pair-bond pair > bond pair-lone pair.

B. lone pair-lone pair > lone pair-bond pair > bond pair-bond pair.

C. bond pair-bond pair > lone pair-bond pair > lone pair-lone pair.

D. bond pair-bond pair > lone pair-lone pair > lone pair-bond pair.

4. What happens when sodium and oxygen combine together ?

A. Each sodium atom gains one electron. B. Each sodium atom loses one electron.

C. Each oxygen atom gains one electron. D. Each oxygen atom loses one electron.

5. In ethanol, C2H5OH(l), there are covalent bonds, hydrogen bonds and van der Waals’ forces. Which bonds or forces are broken when ethanol is vaporized ?

A. only hydrogen bonds B. covalent bonds and hydrogen bonds

C. covalent bonds and van der Waals’ forces

D. hydrogen bonds and van der Waals’ forces

6. Which substance has the lowest electrical conductivity ?

A. Cu(s) B. Hg(l)

C. H2(g) D. LiOH(aq)

7. The ester methyl ethanoate is hydrolysed as shown in the following equation:

CH3COOCH3(l) + H2O(l) CH3COOH(l) + CH3OH(l)

Which one of the following compounds from the reaction mixture has no hydrogen bonding between its molecules when pure?

A CH3COOCH3(l) B H2O(l)

C CH3COOH(l) D CH3OH(l)

8. Which of the following species is (are) planar (has / have) all the atoms in one plane) ?

I. CO32-

II. NO3-

III. SO32-

A. I only B. II only

C. I and II only D. II and III only

9. Which one of the following molecules or ions is pyramidal in shape ?

A BF3

B SF

C CH

D CH

10. Which statement about sigma and pi bonds is correct ?

A. Sigma bonds are formed only by s orbitals and pi bonds are formed only by p orbitals.

B. Sigma bonds are formed only by p orbitals and pi bonds are formed only by s orbitals.

C. Sigma bonds are formed by either s or p orbitals, pi bonds are formed only by p orbitals.

D. Sigma and pi bonds are formed by either s or p orbitals.

Here we are with the next set of revision questions .....

Good luck, I'll post the answers in 24 hrs.

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1) A

2) B

3) B

4) B

5) D

6) C

7) A

8) B

9) - (C&D are the same)

10) C

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And the answers are .....

1, C

2, B

3, B

4, B

5, D

6, C

7, A

8, C

9, D

10, C

How did you do?

I am just about to post some more questions on Enthalpies / Energetics .... see you there!

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And the answers are .....

1, C

2, B

3, B

4, B

5, D

6, C

7, A

8, C

9, D

10, C

How did you do?

I am just about to post some more questions on Enthalpies / Energetics .... see you there!

I got 1 and 8 wrong, and I couldn't answer no. 9 because answers C&D are both the same

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