An amorphous solid (X) burns in air to form a gas (Y) which turns lime water milky. This gas decolourises aqueous solution of acidified $KMn{O}_4$. Gas (Y) reacts with oxygen to give another gas (Z) which is responsible for acid rain. X, Y, and Z are:

Q. An amorphous solid $A$ burns in air to form a gas $B$ which turns lime water milky. This gas is also produced as a by-product during reacting of sulphide ore. This gas decolourises acidified aqueous $KMn{O}_4$ solution and reduces $F{e}^{3+}$ to $F{e}^{2+}$. Identify the solid $A$ and the gas $B$ and write the reactions involved.

Q. An amorphous solid “A” burns in air to form a gas “B” which turns lime water milky. The gas is also produced as a by-product during roasting of sulphide ore. This gas decolorizes acidified aqueous $KMn{O}_4$ solution and reduces $F{e}^{3+}$ to $F{e}^{2+}$. Identify the solid “A” and the gas “B” and write the reactions involved.

Q. A crystalline solid $X$ reacts with $dil.HCl$ to liberate a gas $Y$. $Y$ decolourises acidified $KMn{O}_4$. When a gas $Z$ is slowly passed into an aqueous solution of $Y$, colloidal sulfur is obtained. $X$ and $Z$ could be, respectively:

Q.
Gas (X), (Y) and (Z) are -

Q. A gas (X) is obtained when copper reacts with dilute HN03. The gas thus formed reacts with oxygen to give brown fumes of (Y). (Y) when dissolved in water gives an important acid (Z) and the gas (X). X, Y, and Z respectively are: