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state how would you obtain (i) hydrogen (ii) nitric acid (iii)nascent chlorine from nitirc acid. state the concentration of nitric acid used in each case.

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Solution

H₂ from HNO₃can be obtained as follows:
Mg + HNO_3(dil)------> Mg(NO₃)₂+ H₂
HNO_3(conc.) + 3HC1 -----> NOC1 + 2H₂O + 2[C1]

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Q. Which of the acids dilute sulphuric, concentrated sulphuric, dilute nitric and concentrated nitric would you choose for the preparation of hydrogen? Explain why you would not use the acids you reject.

Q. (a) Nitric acid cannot be concentrated beyond 68% by the distillation of a dilute solution of HNO₃. State the reason.
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(i) In laboratory preparation of nitric acid all the apparatus including cork should be made up of glass.
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(iv) Conc. nitric acid renders iron passive.
(v) Nitric acid is used in purification of gold.
(vi) Aqua regia dissolves gold and platinum.
(vii) Nitric acid usually does not yield hydrogen from acids.
(viii) Lightning is a blessing in disguise.
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(x) Concentrated nitric acid is a stronger oxidizing agent.

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