Chemistry
Name the following:
(a) Two metals which give hydrogen with cold water.
(b) A metal which liberates hydrogen only when steam is passed over red hot metal.
(c) The process in which oxygen is added or hydrogen is removed.
(d) A metallic oxide which can be reduced into metal by hydrogen.
Hydrogen
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Answer
(a) Potassium, sodium
(b) Iron
(c) Oxidation
(d) Lead monoxide (PbO)
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Related Questions
Complete and balance the following equations:
(a) H2 + ……………….. ⟶ 2HCl
(b) H2 + S ⟶ ……………………
(c) Zn + ……………. ⟶ ZnCl2 + H2
(d) CuO + ………….. ⟶ Cu + ………….
(e) Fe + H2O ⟶ …………….. + ……………
(f) K + H2O ⟶ ……………… + ……………
Give reasons for the following:
(a) Hydrogen can be used as a fuel.
(b) Though hydrogen is lighter than air it cannot be collected by downward displacement of air.
(c) A pop sound is produced when hydrogen gas is burnt.
(d) Helium has replaced hydrogen in weather observation balloons.
(e) Nitric acid is not used for the preparation of hydrogen gas.
(a) Name the chemicals required to prepare hydrogen gas in the laboratory.
(b) Give a balanced chemical equation for the reaction.
(c) Draw a neat and well-labelled diagram for the laboratory preparation of hydrogen.
(d) How is hydrogen gas collected? Why?
How would you show that hydrogen:
(a) is a non-supporter of combustion?
(b) is lighter than air?