Chemistry
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
Hydrogen
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Answer
P, Q and S
Reason — In the above reaction, steam is passed over red hot iron. Oxygen has been added to iron, iron has been oxidised by water vapour. Therefore, water is oxidising agent and water is getting reduced by iron, which is reducing agent.
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Which metal gives hydrogen with all of the following: water, acids, alkalis?
- Fe
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- Mg
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Which of the following metals does not give hydrogen with acids?
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- Magnesium
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Which of the following statements about the reaction given below are incorrect?
ZnO (s) + C (s) ⟶ Zn (s) + CO
P — Zinc is getting reduced.
Q — Carbon is getting oxidised.
R — Carbon monoxide is getting oxidised.
S — Zinc oxide is getting reduced.
- P and Q
- P and R
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Zinc metal can react with which of the following options under appropriate conditions to produce hydrogen?
P — Steam
Q — Dilute acid
R — Strong alkalies
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- Q and R
- R and P
- All of these