Question

A material melts at -77 C, is non-conductive, and consists of small individual molecules held together by inter-molecular forces. Which of the molecules below is this material likely to be?

a.C (diamond)
b.MgO
c.NaCl
d .NH3

Answer 1

Answer:

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Answer 2

d. A material melts at -77°C, is non-conductive, and consists of small individual molecules held together by intermolecular forces is $NH_{3}$.

Let's check each option,

a. C(diamond) - Melting point of diamond is noted to be $4027^{0}$C.

b. MgO [Magnesium Oxide] - Melting point of Magnesium Oxide is 2,852 °C.

c. NaCl [Sodium Chloride] - Melting point of Sodium Chloride is 801 °C.

d. $NH_{3}$ [Ammonia] - Melting point of Ammonia is -77 °C.

Since, we saw that only melting point of ammonia matches with the given question, ammonia the the answer.

Therefore, answer is d. $NH_{3}$.