Nitrolim is obtained by passing nitrogen over:

Options

A. heated mixture of `Al_(2)O_(3)` and carbon
B. oleum
C. calcium carbide
D. heated calcium carbide

Answer

To solve the question "Nitrolim is obtained by passing nitrogen over:", we need to follow these steps:

### Step 1: Understand what Nitrolim is
Nitrolim is a chemical compound known as calcium cyanamide, which has the formula CaCN2. It is important to recognize this before proceeding.

**Hint:** Remember that Nitrolim is synonymous with calcium cyanamide.

### Step 2: Identify the reactants involved in the formation of Nitrolim
Nitrolim is produced by the reaction of calcium carbide (CaC2) with nitrogen gas (N2). This is a key reaction that we need to focus on.

**Hint:** Look for the reactants that can combine to form calcium cyanamide.

### Step 3: Write the reaction equation
The reaction can be summarized as follows:
\[ \text{CaC}_2 + \text{N}_2 \rightarrow \text{CaCN}_2 + \text{C} \]
Here, calcium carbide reacts with nitrogen to produce calcium cyanamide and carbon.

**Hint:** Consider the chemical equation that represents the formation of Nitrolim.

### Step 4: Identify the correct option
From the information gathered, we can conclude that Nitrolim is obtained by passing nitrogen over calcium carbide (CaC2). Therefore, the correct answer to the question is calcium carbide.

**Hint:** Check the options given in the question for the presence of calcium carbide.

### Final Answer:
Nitrolim is obtained by passing nitrogen over calcium carbide (CaC2).