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Question
Give a balanced equation for the following conversion.
\[\ce{ZnO<-H2O->Fe3O4}\]
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Solution
\[\ce{Zn + H2O->ZnO + H2}\]
\[\ce{3Fe + 4H2O⇌Fe3O4 + 4H2}\]
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MULTIPLE CHOICE QUESTIONS
Hydrogen burns in oxygen to form
- hydrogen sulphide
- nitrates
- water
- ammonia
FILL IN THE BLANK
In electrolysis of water, dilute sulphuric acid is added to increase ..................of water.
Give reason for the following:
Purified and dried hydrogen is collected over mercury.
Hydrogen may be prepared in the laboratory by the action of a metal on an acid.
Which of the acids dilute sulphuric, concentrated sulphuric, dilute nitric acid and concentrated nitric acid would you choose? Explain why you would not use the acids you reject.
Complete and balance the following reaction.
Mg + H2O →_____________ +___________
Complete and balance the following reaction.
Fe + HCl →_____________ +___________
State how hydrogen occurs in the free state. Name three compounds containing hydrogen in the combined state.
Give reason for the following:
In the preparation of hydrogen by electrolysis of water – the distilled water used is acidified.
Give a balanced equation for obtaining hydrogen from?
Steam using a metal – and the reaction is reversible.
Give a balanced equation for the following conversion.
\[\ce{MgCl2<-HCl->FeCl2}\]
