Which one of the following is a correct set?

Let A_(1) , A_(2) and A_(3) be subsets of a set X . Which one of the following is correct ?

Which one of the following is the correct set with respect to molecule, hybridization and shape ?

Which one of the following is the correct set with respect to molecule, hybridization and shape ?

Which one of the following is correct set of SiO_(2)

Which one of the following is the correct set of three precautions for setting up the experiment to demonstrate that carbon dioxide is evolved during respiraition?

Which one of the following is the correct set with reference to molecular formula, hybridisation of central atom and shape of the molecule?

If phi is the empty set then which one of the following is correct ?

If phi is a null set, then which one of the following is correct?