Which among the following is $\underline{\text{NOT}}$ a mineral of chlorine?

Which red-brown gas is evolved when $KCl$ is heated with solid $K_2Cr_2O_7$ and concentrated $H_2SO_4$?

Which of the following substances is used to prepare $UF_6$ during the enrichment process of ${}_{92}U^{235}$?

What are $X$ and $Y$ in the given reactions?
$2X_{2(g)} + 2H_2O_{(l)} \to 4H^{+}_{(aq)} + 4X^{-}_{(aq)} + O_{2(g)}$
$Y_{2(g)} + H_2O_{(l)} \to HY_{(aq)} + HOY_{(aq)}$

Which of the following acids is the weakest?

In the following reaction,identify the nature of the product formed by the complete hydrolysis of the underlined atom at $R.T.$:
$\underline{S}F_6 + H_2O \longrightarrow$ No reaction