In which of the following compounds will nitrogen not be detected by the Lassaigne test?

  • A
    $NH_2CONHNH_2 \cdot HCl$
  • B
    $NH_2NH_2 \cdot HCl$
  • C
    $NH_2CONH_2$
  • D
    $C_6H_5NHNH_2 \cdot HCl$

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The Kjeldahl's method for the estimation of nitrogen can be used to estimate the amount of nitrogen in which one of the following compounds?

Beilstein test is used for the detection of which one of the following elements?

Which of the following nitrogen-containing compounds does not give Lassaigne's test?

Lassaigne's test for the detection of nitrogen fails in

Match the organic compounds in column $I$ with the Lassaigne's test results in column $II$ appropriately.
Column $I$ Column $II$
$A$. Aniline $i$. Red colour with $FeCl_3$
$B$. Benzene sulfonic acid $ii$. Violet colour with sodium nitroprusside
$C$. Thiourea $iii$. Blue colour with hot and acidic solution of $FeSO_4$

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