Question

An element “X” after reacting with acids liberate hydrogen gas and can displace Lead and Tin from
their salt solution. The metal ‘X’ is :
(1) Copper (2) Gold
(3) Nickel (4) Mercury

Answer 1

Answer:

copper

Explanation:

because it is more reactive than tin and lead.

Answer 2

Answer:

nickel

Explanation:

nickel is more reactive tan both tin and lead hence can replace them from their salt solution gold copper and mercury are all less reactive than lead and tin.

reactivity series:

K. na. ca. mg. al. Zn. fe. sn. pb. h. cu. hg. ag. au