Clayey soil holds little air and is heavy.
Only statement 3 is wrong.
Clayey soil has a higher proportion of fine particles and hence it is closely packed. Due to this close packing of particles, clayey soil has good water retention and low air retention. As a result of this, clayey soil is heavy.
Clayey soil is sticky when wet and smooth when dry. This kind of soil is ideal for crops which need standing water to grow. Most of the pottery pieces you see every day are made from the finest clayey soil.