Class 9th CBSE Chemistry CBQ'S (Case Base Study) Atoms and Molecules -Science

Class 9th CBSE Chemistry CBQ'S (Case Base Study) Atoms and Molecules -Science
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1. A liquid compound X of molecular mass 18 u can be obtained from a number of natural sources. All the animals and plants need liquid X for their survival. When an electric current is passed through 200 grams of pure liquid X under suitable conditions, then 178 grams of gas Y and 22 grams of gas Z are produced. Gas Y is produced at the positive electrode whereas gas Z is obtained at the negative electrode. Moreover, gas Y supports combustion whereas gas Z burns itself causing explosions. (a) Name,  (i) liquid X,  (ii) gas Y and  (iii) gas Z.  (b) What is the ratio of the mass of element Z to the mass of element Y in the liquid X?  (c) Which law of chemical combination is illustrated by this example?  (d) Name, two sources of liquid X.  (e) State an important use of Y in our life. -------------------------------------------------------------------------------------------------------------------------- More questions to be added shortly...
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