Which of the following statements is true about salts?
a. salts are made when an acid reacts with a base, carbonate or metal
c. salts are compounds formed by the neutralization of an acid with a base
b. the name of the salt formed depends on the metal in the base and the acid used

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.

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