Aqua-regia reacts with $Pt$ to yield

Manganese dioxide on heating with concentrated hydrochloric acid gives a greenish yellow gas,$X$. With excess of ammonia,$X$ gives $Y$ and $Z$. $Y$ and $Z$ respectively are:

$Br_2$ gas turns starch iodide paper

The reaction of concentrated $HNO_3$ with iodine produces ....

Euchlorine is a mixture of .........

One of the hydrolysed products of the following compound does not react with the silica of a glass vessel.