The first metal used by man was
...The first metal used by man was
iron
copper
gold
bronze
Correct answer is B
No explanation has been provided for this answer.
The general formula for the alkanals is ...
The pair of compounds that belongs to the same homologous series is ...
The acid in electrolysis of water is dilute ...
What is the atomic number of Strontium? ...
The ores that can be concentrated by flotation are ...
The presence of an impurity in substance will cause the melting point to ...