Why is rain water always somewhat acidic?

select all that apply!

a. because the carbon dioxide in the air mixes with it to form carbonic acid.
b. because the carbon dioxide levels in the atmosphere are at an all-time high.
c. because nitrous oxide released from burning petroleum mixes with it to form nitric acid.
d. because sulfur dioxide released from burning petroleum mixes with it to form sulfuric acid.

The table lists the lattice energies of some compounds. compoundlattice energy (kj/mol)lif            –1,036licl            –853naf            –923kf            –821nacl            –786which statement about crystal lattice energy is  best  supported by the information in the table? the lattice energy increases as cations get smaller, as shown by lif and kf. the lattice energy increases as the cations get larger, as shown by lif and licl. the lattice energy decreases as cations get smaller, as shown by nacl and naf. the lattice energy decreases as the cations get smaller, as shown by naf and kf.