Hydrogen is the lightest element, but it is not used in weather forecasting balloons. Give reason.

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Solution

Hydrogen is not used in weather forecasting balloons because it is highly explosive and flammable.
Therefore helium gas is used in balloons because it is lighter than air and it rises up.

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Give reasons for the following :

(a) Sodium hydrogen sulphate is not an acid but it dissolves in water to give hydrogen ions, according to the equation

$N a H S O_{4} ⇌ H^{+} + N a^{+} S O_{4}^{2 -}$

(b) Anhydrous calcium chloride is used in a desiccator.

Hydrogen balloons are used to study the weather.

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