Question

With the help of balanced chemical equation explain what happens when:(1)Zinc is put in dilute hydrochloric acid (2)Zinc is put in concentrated sodium hydroxide.(3)Hydrogen is passed over hot tungsten oxide.(40Hydrogen is reacted with carbon monoxide in presence of a catalyst.

Answer 1

(1) Zn+2HCl------> ZnCl2+H2
(2) Zn+ 2NaOH--------->Na2ZnO2+H2
(3) 3H2+W2O3-----------> 3H2O+2W
(4) CO + 2H2-------> CH3OH

Answer 2

1) Metal+Acid-->Salt+Hydrogen gas
\[Zn _{(s)}+2HCl _{(aq)} \rightarrow ZnCl _{2(s)}+H _{2(g)}\]

2) Base reacts with metals and release hydrogen gas. REMEMBER NOT ALL METALS REACT WITH BASE.\[Zn+2NaOH \rightarrow Na _{2}ZnO _{2}+H _{2}\]

3)\[3H _{2}+W _{2}O _{3}\rightarrow 3H _{2}O+2W\]

4) \[CO+2H _{2}\rightarrow CH _{3}OH\]

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