Which of these compounds are used to reduce acidity of soil Calcium Oxide and Ammonium Sulfate
Calcium Oxide and Calcium hydroxide
Ammonium Sulfate salts

Explanation:

To reduce the acidity of the soil, bases are used.

Calcium Oxide and Calcium Hydroxide are two such bases that are often used.

a. they are both space stations

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answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.