name the substance witch is insoluble in water is added to dilute hydrochloric acid a colourless gas is evolved?
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You have asked a very general question which probably has a few dozen answers, if not more. Zn is one of those answers.
Zn is a metal, is not soluble in water, and when added to dilute HCl produces H2 gas which is colorless.
The substance you are referring to is a metal called zinc (Zn). When zinc is added to dilute hydrochloric acid (HCl), a chemical reaction occurs, resulting in the evolution of a colourless gas called hydrogen gas (H2). This reaction can be represented by the following equation:
Zn + 2HCl -> ZnCl2 + H2
Here, the zinc reacts with the hydrochloric acid to form zinc chloride (ZnCl2) and release hydrogen gas. The gas bubbles can be observed as effervescence.