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Hydrogen can be prepared with the help of cold water. Give a reaction of hydrogen with:
A divalent metal
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Hydrogen may be prepared in the laboratory by the action of a metal on an acid.
Which of the metals copper, zinc, magnesium or sodium would be the most suitable?
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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.
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Hydrogen may be prepared in the laboratory by the action of a metal on an acid.
How would you modify your apparatus to collect dry hydrogen? Which drying agent would you employ for this purpose?
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Why are the following metals not used in the lab preparation of hydrogen?
calcium
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Why are the following metal not used in the lab. preparation of hydrogen?
iron
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Why are the following metals not used in the lab. preparation of hydrogen?
aluminium
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Why are the following metals not used in the lab. preparation of hydrogen?
sodium
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Complete and balance the following reaction.
Na + H2O →_____________ +___________
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Complete and balance the following reaction.
Ca + H2O →_____________ +___________
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Complete and balance the following reaction.
Mg + H2O →_____________ +___________
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Complete and balance the following reaction.
Zn + H2O →_____________ +___________
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Complete and balance the following reaction.
Fe + H2O →_____________ +___________
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Complete and balance the following reaction.
Zn + HCl →_____________ +___________
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Complete and balance the following reaction.
Al + H2SO4 →_____________ +___________
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Complete and balance the following reaction.
Fe + HCl →_____________ +___________
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Complete and balance the following reaction.
Zn + NaOH →_____________ +___________
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Complete and balance the following reaction.
Al + KOH + H2O→_____________ +___________
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Give reason:
A candle brought near the mouth of a jar containing hydrogen gas starts burning but is extinguished when pushed inside the jar.
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Correct the following statement:
Hydrogen is separated from CO by passing the mixture through caustic potash solution.
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