Give reasons:
(a) The oxides of metal like Na, Mg and Ca cannot be reduced by carbon.
(b) Aluminum containers used to transport nitric acid
(c) Molten sodium chloride conducts electricity whereas solid NaCl will not.
(d) The galvanized iron article is protected against rusting even if the zinc layer is broken.
(e) An iron knife kept dipped in a blue copper sulphate solution colour of solution changes to light green.
(f) Articles made of Aluminum do not corrode even though aluminum is an active metal.
Answers
Answer:
a)This is because sodium and magnesium are more reactive than carbon. This means that carbon cannot reduce the oxides of these metals. The two metals are above carbon in the reactivity series and thus have a high affinity to oxygen than carbon does and thus cannot be reduced by it.
b)Aluminium containers are used to transport nitric acid because the aluminium first reacts with the oxygen of air to form a protective layer of aluminium oxide which prevents further reaction.
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Answer:
A) This is because sodium and magnesium are more reactive than carbon. This means that carbon cannot reduce the oxides of these metals. The two metals are above carbon in the reactivity series and thus have a high affinity to oxygen than carbon does and thus cannot be reduced by it.
B) Aluminium containers are used to transport nitric acid because the aluminium first reacts with the oxygen of air to form a protective layer of aluminium oxide which prevents further reaction.
C) Sodium chloride is an ionic compound having sodium and chloride ions in its structure. Ionic compounds do not conduct electricity in solid state because ions are fixed in position and cannot move but in aqueous solution and in molten state they conduct electricity as ions are free to move.
D) If the zinc coating is broken, the galvanised object remains protected against rusting because zinc is more reactive than iron and hence can be easily oxidised . Thus when zinc layer breaks down, the zinc continues to react and gets oxidised .
E) An iron knife is dipped in a blue copper sulphate solution turns the blue solution green as iron is more reactive than copper so iron will displace copper from its solution and the blue colour of copper sulphate will turn into green. This is known as Displacement reaction.
F) article made of aluminium do not corrode even though aluminium is an active metal. Aluminum is a reactive metal and reacts readily with moisture and water. On reaction it forms a layer of Aluminum Oxide, which protects Aluminum from being corrode.