a) Dinitrogen pentoxide can be prepared by dehydrating nitric acid with P₄O₁₀.
b) On heating $P b {(N O_{3})}_{2}$ at $400^{o} C,$ a brown-coloured gas with diamagnetic nature is obtained.
c) $68 % (w / w) H N O_{3}$ can be concentrated to 98% by using conc. $H_{2} S O_{4}$ .
d) The familiar brown ring test for nitrates depends on the ability of $F e^{+ 3}$ to reduce nitrates to nitric oxide.
The correct statements are

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a and c only

a,c and d only

c and d only

a,b and c only

answer is A.

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Detailed Solution

b – On heating $P b {(N O_{3})}_{2}$ at 4000C, a brown colored $N O_{2}$ gas with paramagnetic nature is obtained
d – The brown ring test or nitrate test is a reduction reaction. The nitrate is reduced to nitric oxide (NO) by ferrous (II) ions from ferrous sulphate, which is oxidised to ferric (III) ions.