Answer these questions in simple language1 what happen when iron granules react with dilute hydrochloric acid2 why does the colour of the solution change when iron nails are kept in an aqueous solution of copper sulphate 3 on passing carbon dioxide into lime water, it turns milky. why? 4 write down properties of chemical reaction

Answer these questions in simple language1 what happen when iron granu

1.	Answer these questions in simple language1 what happen when iron granules react with dilute hydrochloric acid2 why does the colour of the solution change when iron nails are kept in an aqueous solution of copper sulphate 3 on passing carbon dioxide into lime water, it turns milky. why? 4 write down properties of chemical reaction
Answer» 4.no question answer-----The changing of color of a substance is not NECESSARILY an indicator of a chemical CHANGE. For example, changing the color of a METAL does not change its physical properties. However, in a chemical reaction, acolor change is usually an indicator that a reaction is occurring. 3.no question answer------When carbon dioxide is passed through lime water it turns milky due to the formation of water insoluble precipitate CaCO3. Still if excess of CO2 is passed it forms water solubleCalcium bicarbonate . Thus the SOLUTION remains clear. see the picture please... 2.no question answer------When Iron nail (Ferrum) is dipped inCopper sulphate (CuSO4) there takes reaction between them andcoppersulphate change its color from blue to light green. This shows Iron ismore REACTIVE than Copper, it canreplace Copper from CuSO4. CuSO4 isin blue Color and FeSO4 is in lightgreen color. please see the picture of my book