Consider the following statements and select the correct answer from the code given below:

1. Brass is a compound of copper and zinc.
2. Magnetite is the most important ore of aluminium.
3. Amalgam is that substance which basically contains mercury.
4. Potassium nitrate is one of the essential chemicals used in photography.

Code:

A) 1 and 2

B) 1 and 3

C) 2 and 3

D) 1, 3 and 4

This MCQ is part of the UP PSC Previous Year Questions (PYQs) series, focusing on UPPSC Prelims 2003 (GS Paper I)