Chemistry
Which metal gives hydrogen with all of the following: water, acids, alkalis?
- Fe
- Zn
- Mg
- Pb
Answer
Zn
Reason — Zn has a unique nature.
Zinc is considered to have a unique nature because it can react with acids and can even react with hot conc. alkalis to form hydrogen and a soluble salt.
Zn + 2HCl ⟶ ZnCl2 + H2
Zn + 2NaOH ⟶ Na2ZnO2 + H2 ↑
Zn with water also gives hydrogen
Zn + H2O ⟶ ZnO + H2
Related Questions
Which of the following statements about hydrogen is incorrect ?
- It is an inflammable gas
- It is the lightest gas.
- It is not easily liquefied.
- It is a strong oxidizing agent.
For the reaction PbO + H2 ⟶ Pb + H2O, which of the following statements is wrong?
- H2 is the reducing agent.
- PbO is the oxidizing agent.
- PbO is oxidized to Pb
- H2 is oxidized to H2O.
Which of the following metals does not give hydrogen with acids?
- Iron
- Copper
- Magnesium
- Zinc
Which of the following statements about the reaction given below are correct?
3Fe (s) + 4H2O (g) ⟶ Fe3O4 (s) + 4H2 (g)
P — Iron is getting oxidised.
Q — Water is getting reduced.
R — Water is a reducing agent.
S — Water is an oxidising agent.
- P, Q and R
- R and S
- P, Q and S
- Q and S