Why Did Neha Get The Driver Arrested ? #shorts | Paheliyan | Paheli | Zestful Paheli |

A student collected three samples of water from different sources and found out the percentage of hydrogen and oxygen by mass in thse samples. It should have been 1 : 8 by mass. But it was different in all three samples, Moreover, the values did not match (i) In your opinion why did the student get different results for different samples ? (ii) What should have been done by him ? (iii) Which law of chemical combination is supported by these observations (iv) How will you check the purity of water in the laboratory ?