Give reasons (a)Conc. HNO3 can be transported in Al container.
Give reasons
(a)Conc. HNO3 can be transported in Al container.
(b) A mixture of diluted NaOH and Al pieces is used to open drain.
(c) Graphite is used as lubricant.
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1 Answers
(a) Al reaches with conc.HNO3 to form a very thin film of Al oxide on its surface which protects it from further reaction
2Al(S) +b 6HNO3 (conc.) – Al2O3 (s) +6NO2(g) +3H2o(l)
(b) NaOH reacts with Al to evolve Hydrogen gas. Thus the pressure of the gas produced can be used for clogged drain
2Al(s) + 2NaOH (aq) + 2 H2O (l) ----------> – 2NaAlO2 (aq) +3 H2 (g)
(c) Graphite has layered structures which are held by weak van der waals forces. Thus, graphite cleaves easily b/w the layer; therefore it is very soft and slippery. That’s why it is used as lubricant.
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