Consider the following equilibrium reaction at $27 °C$
 $N{a}_{2}S{O}_4.10H_{2}O\left(s\right) \rightleftharpoons N{a}_{2}S{O}_4\left(s\right)+10H_{2}O\left(g\right);K_p=1.024\times {10}^{-27}at{m}^{10}$
The vapour pressure of water at  $27°C$  is 0.04 atm.
Choose the incorrect statement from amongst the following:

The mass of a sample of  $N{a}_{2}S{O}_4\left(s\right)$  kept in a large confinement having partial pressure of water $0.04atm,$  increases till it attains a constant weight.

$N{a}_{2}S{O}_4.10H_{2}O\left(s\right)$  effloresces at a relative humidity below 5%.

The mass of a sample of  $N{a}_{2}S{O}_4.10H_{2}O\left(s\right)$ kept in a large confinement having partial pressure of water  $0.01atm,$ decreases till it attains a constant weight.

$N{a}_{2}S{O}_4\left(s\right)$  can be used to dehumidify atmosphere having relative humidity more than 5%.