The substances that sublime can be made to liquefy by

Iron filings and sulphur were mixed together and divided into two parts,$A$ and $B$. Part $A$ was heated strongly while Part $B$ was not heated. Dilute hydrochloric acid was added to both the parts and evolution of gas was seen in both the cases. How will you identify the gases evolved?

Which of the following is a homogeneous mixture?

"Tyndall Effect can be observed when sunlight passes through the canopy of dense forest." Explain how this occurs.

Chromatography is the technique which is used for separation of those solutes that

What would you observe when
$(a)$ a saturated solution of potassium chloride prepared at $60\,^{\circ}\text{C}$ is allowed to cool to room temperature.
$(b)$ an aqueous sugar solution is heated to dryness.
$(c)$ a mixture of iron filings and sulphur powder is heated strongly.