Answer: hydrogen

Explanation:

Hydrogen is insoluble in water this is because hydrogen is non polar while water is polar. There is well known statement that 'like dissolves like' since hydrogen and water are two different types of substances, hence they do not get solubilize

Answer:

sugar

Explanation:

but everything is soluble because oxygen and hydrogen is already in water and salt and sugar can be disslove in water but sugar take time to dissolve so sugar is your answer

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