Give reasons (a)Conc. HNO3 can be transported in Al container. (b) A

1.	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.
Answer» (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.

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.

Answer»

(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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