Question

A yellow powder ‘X’ when burned produces a bright blue flame with a suffocating gas that turns wet blue litmus paper red.
a. Analyze the reaction and identify the element ‘X’. Can this element be used to draw wires?
b. Write the equation involved in the reaction when it is burned in the presence of oxygen.

Answer 1

Yellow coloured powder X which is soluble in CS2 is sulphur. Sulphur burns in oxygen to give sulphur dioxide gas (SO2) which is suffocating smelling gas.

S + O2 -------> SO2

SO2 gas turns moist blue litmus red. This confirms that the gas is acidic in nature. Hence, S is a non-metal.

Answer 2

Yellow coloured powder X which is soluble in CS2 is sulphur. Sulphur burns in oxygen to give sulphur dioxide gas (SO2) which is suffocating smelling gas. SO2 gas turns moist blue litmus red. This confirms that the gas is acidic in nature.

S + O2 ---> SO2

S is a non metal and it cannot be drawn into wires