Which of the following element in alloyed with copper to form brasses.

1. Lead
2. Bismuth
3. Zinc
4. Antimony

Ans: c

Blister copper is,

1. ore of Cu
2. alloy of Cu
3. pure Cu
4. Cu containing 1% impurity

Ans: d

A blue colored salt of group II metal ion gives a blue precipitate with NaOH which on boiling gives black precipitate of

1. Cu₂O
2. CuO
3. HgO
4. ZnO

Ans: b

Which element is added with copper to form bronze?

1. Fe
2. Mn
3. Sn
4. Zn

Ans: c

Bell metal is an alloy of

1. Cu, Pb and Sn
2. Sn and Cu
3. Zn and Pb
4. Zn, Cu and Sn

Ans: b