Online Quiz- How well do you know Africa?

http://www.csmonitor.com/World/Africa/2011/0127/Think-you-know-Africa-Take-our-geography-quiz/Question-5?nav=undefined-undefined-storyList

1. Which African country is the newest country in the world?

2. How many official languages does South Africa have?

3. True or False? The Democratic Republic of the Congo is the  most populous country where French is an official language.

4. True or False? Christians make up 84 percent of Uganda's population.

5. True or False? Côte d'Ivoire was originally known by its English name – the Ivory Coast – but it was officially changed it to the French name in 1985.

6. True or False? Sierra Leone is one of the top 10 diamond producing nations in the world.

7. Niger is one of the hottest countries in the world and is knicknamed  _________________________.

8. Name the African country completely surrounded by South Africa.

9. Which mountain range extends across a stretch of northern Africa through Morocco, Algeria, and Tunisia?

10. What massive African lake is the world's largest tropical lake?

Extra Credit:

Which is the only country in Africa that has not joined the African Union?