Which physical change is endothermic?
(1) co2(> co2(g) (3) co2(> co2(l)
(2) co2(> co2(s) (4) co2(> co2(s)

The correct option is 1.

Explanation: Endothermic reactions are the reactions in which heat is provided to break down the reactant molecules.

In option 1:

The stronger intermolecular forces between the particles in solid molecule are broken down to convert into gaseous form. Hence, some energy in the form of heat is provided to move them far apart. Therefore, it is considered as an endothermic reaction.

In option 2, 3 and 4:

All the other processes involves the formation of bonds and thus there is no need to provide any energy.

d: the voltage of the secondary coil is less than that of the primary coil.

im not suree sorry if wrong

answer7,570,82356 cubic centimeters;