The difference in the properties of `CH_4` and `SiH_4` is due to large difference in the electrongativty of carbon and silicon .

Answer

To determine whether the statement about the difference in properties of CH₄ (methane) and SiH₄ (silane) being due to the large difference in electronegativity of carbon and silicon is true or false, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Electronegativity Values:**
- The electronegativity of carbon (C) is approximately 2.55.
- The electronegativity of silicon (Si) is approximately 1.90.

2. **Calculate the Difference in Electronegativity:**
- The difference in electronegativity between carbon and silicon is:
\[ \Delta EN = EN_{C} - EN_{Si} = 2.55 - 1.90 = 0.65 \]

3. **Analyze the Implications of Electronegativity Difference:**
- A larger difference in electronegativity typically leads to more polar bonds. In the case of CH₄, the C-H bond is relatively non-polar, while in SiH₄, the Si-H bond is more polar due to the lower electronegativity of silicon.

4. **Compare the Properties of CH₄ and SiH₄:**
- CH₄ is a stable, non-polar molecule with a tetrahedral geometry, while SiH₄ is also tetrahedral but has different physical properties such as boiling point, stability, and reactivity due to the difference in bond polarity and the larger atomic size of silicon.

5. **Conclude the Statement:**
- Since the properties of CH₄ and SiH₄ differ significantly and this can be attributed to the difference in electronegativity between carbon and silicon, we can conclude that the statement is **true**.

### Final Answer:
The statement is **true**; the difference in the properties of CH₄ and SiH₄ is indeed due to the large difference in the electronegativity of carbon and silicon.

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