Which of the following describes the compound Mn(NO2)2?

If the compound dissolved in water it would be a strong electrolyte.
The compound is ionic.
The compound would conduct electricity if molten.
The compound is molecular.
The compound would be expected to have a relatively low melting point.

Personally, I am not acquainted with Mn(NO2)2 and The Merck Index doesn't list it. From what I can find on the web plus an old text book of mine, the compound is soluble in water so I would go with 1,2, and 3 as my best educated guess.

To determine the description of the compound Mn(NO2)2, we need to analyze the chemical formula.

In Mn(NO2)2, we can break it down into two parts: Mn and (NO2)2. Let's analyze each part separately.

Mn is the symbol for the element manganese, which is a transition metal. Transition metals commonly form ionic compounds.

(NO2)2 represents the polyatomic ion nitrite. The nitrite ion consists of one nitrogen atom (N) and two oxygen atoms (O), and it carries a charge of -1.

From this information, we can deduce that Mn(NO2)2 is an ionic compound consisting of the Mn cation and the nitrite anion.

Now, let's evaluate each of the given descriptions one by one:

1. If the compound dissolved in water, it would be a strong electrolyte.
- Ionic compounds tend to dissociate into ions when dissolved in water, making them good conductors of electricity. Therefore, this description is correct for Mn(NO2)2.

2. The compound is ionic.
- As mentioned earlier, Mn(NO2)2 is an ionic compound. So, this description is correct.

3. The compound would conduct electricity if molten.
- Ionic compounds conduct electricity when melted because the ions are free to move. Hence, this description is correct for Mn(NO2)2.

4. The compound is molecular.
- Since Mn(NO2)2 consists of ions, it is not molecular. This description is incorrect.

5. The compound would be expected to have a relatively low melting point.
- Ionic compounds generally have high melting points due to the strong electrostatic attractions between ions. Therefore, this description is incorrect for Mn(NO2)2.

In summary, the correct descriptions for the compound Mn(NO2)2 are:
- If the compound dissolved in water, it would be a strong electrolyte.
- The compound is ionic.
- The compound would conduct electricity if molten.
- The compound is not molecular.
- The compound would not be expected to have a relatively low melting point.