Heat required to raise the temperature of 1 mole of a substance by `1^(@)` C is called

Options

A. Specific heat
B. Molar heat capacity
C. Water equivalent
D. Specific gravity

Explanation

To solve the question, we need to identify the term that describes the heat required to raise the temperature of one mole of a substance by 1 degree Celsius. Let's break down the solution step by step.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the term that describes the heat required to raise the temperature of one mole of a substance by 1°C.

**Hint**: Focus on the definition of heat capacity and how it relates to moles.

2. **Identifying Key Terms**: The options provided are:
- A) Specific heat
- B) Molar heat capacity
- C) Water equivalent
- D) Specific gravity

**Hint**: Recall the definitions of each term and how they relate to heat and temperature changes.

3. **Analyzing the Options**:
- **Specific heat** refers to the heat required to raise the temperature of a unit mass of a substance by 1°C. This does not apply to moles but rather to mass.
- **Molar heat capacity** refers to the heat required to raise the temperature of one mole of a substance by 1°C. This directly matches the question.
- **Water equivalent** is a concept used to compare the heat capacity of different substances to that of water, but it does not define the heat capacity itself.
- **Specific gravity** is a ratio that compares the density of a substance to the density of water and is not related to heat capacity.

**Hint**: Eliminate the options that do not pertain to moles or heat capacity.

4. **Selecting the Correct Answer**: Based on the definitions and analysis, the term that accurately describes the heat required to raise the temperature of one mole of a substance by 1°C is **molar heat capacity**.

**Hint**: Look for the term that specifically mentions "mole" in its definition.

5. **Final Answer**: Therefore, the correct answer is **B) Molar heat capacity**.

### Summary:
The heat required to raise the temperature of one mole of a substance by 1°C is called **molar heat capacity**.