Which of the following is a valid unit for specific heat?

a. °c
b. cal
c. cal/g
d. cal/g°c

Option (d) is the correct answer.

Explanation:

When a substance is heated and the heat used to raise its temperature by a unit mass of the given amount is known as specific heat of the substance.

Mathematically,    

where              Q = heat added in calories or joules

                        m = mass of substance in grams or kg

                        C = specific heat

                = change in temperature

Thus,  

Hence, we can conclude that a valid unit for specific heat is ca.