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# The solution of $X$ having excess of caustic potash is used to detect ammonia. Which of the following is $X$?

$\begin {array} {1 1} (a)\;K_2[HgI_4] & \quad (b)\;[Co(NH_3)(_6]Cl_3 \\ (c)\;K_3[F_e(NCS)_6] & \quad (d)\;[Co(NH_3)_5SO_4]Br \end {array}$
Can you answer this question?

$(a)\;K_2[HgI_4]$
answered Nov 7, 2013 by