Which of the following is not a chemical element?

copper
iron
brass
chromium
Copper, iron and chromium are chemical elements. Brass is a metal alloy made of copper and zinc.
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Answers by country

copper
iron
brass
chromium
answers
flagGhana
0%
2%
94%
2%
35
flagFrance
0%
0%
94%
5%
18
flagSingapore
2%
0%
89%
5%
38
flagRepublic of Ireland
3%
0%
88%
7%
26
flagUnknown
2%
4%
87%
6%
47
flagthe United Arab Emirates
0%
4%
87%
4%
24
flagPoland
3%
4%
84%
6%
14128
flagAustralia
1%
2%
84%
12%
88
flagMalaysia
0%
2%
83%
4%
42
flagthe United Kingdom
3%
2%
81%
10%
316
flagCanada
1%
7%
81%
7%
66
flagIndia
1%
6%
80%
9%
852
flagNigeria
1%
7%
79%
7%
113
flagthe Philippines
1%
6%
78%
9%
75
flagthe United States
4%
4%
77%
12%
607
flagGermany
3%
5%
77%
11%
566
flagPakistan
4%
7%
76%
9%
103
flagAustria
8%
3%
73%
15%
86
flagSaudi Arabia
10%
10%
70%
5%
20
flagSwitzerland
6%
9%
68%
9%
44