Step 1: Identify the incorrect pairs.
- Christopher Columbus is credited with discovering America, so this pair is correct.
- Vasco-da-Gama is often associated with the discovery of the sea route to India, not China, making this pair incorrect.
- Mungo Park is known for exploring parts of Africa, specifically the Niger River, so this pair is correct.
- Abel Janszoon Tasman is famous for discovering Tasmania, not New Zealand, which makes this pair incorrect.
Step 2: Write the correct pairs.
The correct pairs should be:
- Vasco-da-Gama - Discovery of India
- Abel Janszoon Tasman - Discovery of Tasmania
Final Answer:
\[
\boxed{(ii) \; Vasco-da-Gama \; - \; Discovery \; of \; India}
\boxed{(iv) \; Abel \; Janszoon \; Tasman \; - \; Discovery \; of \; Tasmania}
\]