Question

‘X’ on hydrolysis gives two products. One of them is solid. What is ‘X’?

• A. \( P_4O_{10} \)
• B. \( F_2 \)
• C. \( SiCl_4 \)
• D. \( N_3^- \)

Hint:

Covalent chlorides, such as \( SiCl_4 \), hydrolyze in water to form their corresponding oxides and acids. In this case, \( SiCl_4 \) hydrolyzes to produce \( SiO_2 \) (solid) and \( HCl \) (aqueous).

Answer 1

The Correct Option is C

To determine which of the given compounds ‘X’ hydrolyzes to produce two products with one being a solid, we need to evaluate the hydrolysis reactions of each option.

1. \( P_4O_{10} \): Phosphorus pentoxide (\( P_4O_{10} \)) reacts with water to form phosphoric acid (\( H_3PO_4 \)). This is shown in the reaction:

\( P_4O_{10} + 6H_2O \rightarrow 4H_3PO_4 \)

Both reactants and products are in the liquid or aqueous phase, so no solid forms.

2. \( F_2 \): Fluorine (\( F_2 \)) reacts with water to form hydrogen fluoride (\( HF \)) and oxygen (\( O_2 \)):

\( 2F_2 + 2H_2O \rightarrow 4HF + O_2 \)

Similarly, no solid forms; both products are gases or liquids.

3. \( SiCl_4 \): Silicon tetrachloride (\( SiCl_4 \)) reacts with water to produce silicon dioxide (\( SiO_2 \)) and hydrochloric acid (\( HCl \)). The reaction is:

\( SiCl_4 + 2H_2O \rightarrow SiO_2 + 4HCl \)

Here, silicon dioxide (\( SiO_2 \)) is a solid product.

4. \( N_3^- \): The azide ion does not undergo a simple hydrolysis reaction to form one solid product and another distinct product, making it less likely.

Thus, among the given options, \( SiCl_4 \) is the compound that upon hydrolysis yields a solid (silicon dioxide) and a second product, hydrochloric acid. Therefore, the correct answer is \( SiCl_4 \).

Answer 2

The given question asks about a substance 'X' which, upon hydrolysis, produces two products, one of which is solid. Let's analyze the options one by one:

Option 1: P₄O₁₀

P₄O₁₀ on hydrolysis forms phosphoric acid (H₃PO₄), which is a liquid, not a solid. So, this is not the correct answer.

Option 2: F₂

F₂ (fluorine gas) does not give a solid product on hydrolysis, as it reacts to form hydrofluoric acid (HF), which is in liquid form. Therefore, this is also not the correct answer.

Option 3: SiCl₄

SiCl₄ (silicon tetrachloride) reacts with water (hydrolysis) to form silicon dioxide (SiO₂), which is a solid, and hydrochloric acid (HCl), which is a liquid. Therefore, SiCl₄ is the correct answer.