Question

A student was given Mg, Zn ,Fe and Cu .Identify which of the metal



a) Will not displace Hydrogen gas from dilute HCl

b) Will react with hot water to give hydrogen gas

c) Will react with a strong base like sodium hydroxide.

d) Will form a brown coating when exposed to moist air for long time.​

Answer 1

Answer: {a} Will not displace Hydrogen gas from dilute HCl.

Answer 2

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a) Cu

b) Fe

c) Zn

liberate H2.

Explanation - 1) Except copper, other metals react with HCI to Zn + 2HCl -> ZnCl2 + H2 2Fe +6HCI -> 2FeC13 + 3H2

Mg + 2HCl -> MgCl2 + H2

2) Iron will react with only steam to give H2 gas.

2Fe + 3H2O -> Fe203 + 3H2

3) Zinc will give H2 with 5% HNO3. Zn + 2HNO3 --> Zn(NO3)2 + H2

Hope this helps you...