A) green
B) light bluish
C) yellow
D) none of these
Correct Answer: B
Solution :
Hydrogen is a colourless, odourless and taste less gas. It is highly inflammable. In lab, it is prepared as follows \[Zn(s)+{{H}_{2}}S{{O}_{4}}(aq)\xrightarrow{{}}ZnS{{O}_{4}}(aq)+{{H}_{2}}\uparrow \] Dihydrogen is a combustible gas and burns in air or oxygen with nearly invisible pale blue flame to form water \[2{{H}_{2}}(g)+{{O}_{2}}(g)\xrightarrow{{}}2{{H}_{2}}O(g)\]
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