Complete the following reactions: ?
(i) `SiO_(2) + 2NaOH to X + H_(2) O`
(ii) `SiO_(2) + 4HF to Y + 2H_(2) O`
(iii) `Si + 2CH_(3)CI underset(570 K)overset("Cu power")(to) Z`
`{:(X,Y,Z):}`

Options

A. `{:(Na_(2)SiO_(3), SiF_(4), (CH_(3))_(2) SiCI_(2)):}`
B. `{:(H_(2) SiO_(3), SiF_(2), CH_(3) SiCI_(3)):}`
C. Na2SiO3, H2SiO3 ,(CH3)3 SiCI
D. `{:(Na_(2)SiO_(3), H_(2)SiF_(4),(CH_(3))_(2) SiCI_(2)):}`

Explanation

To complete the reactions given in the question, we will analyze each reaction step by step.

### Step 1: Analyze the first reaction
**Reaction:**
\[ \text{SiO}_2 + 2\text{NaOH} \rightarrow X + \text{H}_2\text{O} \]

**Explanation:**
Silicon dioxide (SiO₂) reacts with sodium hydroxide (NaOH) to form sodium silicate (Na₂SiO₃) and water (H₂O).

**Product:**
\[ X = \text{Na}_2\text{SiO}_3 \]

### Step 2: Analyze the second reaction
**Reaction:**
\[ \text{SiO}_2 + 4\text{HF} \rightarrow Y + 2\text{H}_2\text{O} \]

**Explanation:**
Silicon dioxide (SiO₂) reacts with hydrofluoric acid (HF) to produce silicon tetrafluoride (SiF₄) and water (H₂O).

**Product:**
\[ Y = \text{SiF}_4 \]

### Step 3: Analyze the third reaction
**Reaction:**
\[ \text{Si} + 2\text{CH}_3\text{Cl} \xrightarrow{570 \text{ K}, \text{Cu}} Z \]

**Explanation:**
Silicon (Si) reacts with methyl chloride (CH₃Cl) in the presence of copper powder at 570 K to produce dimethyl silicon dichloride (CH₃)₂SiCl₂.

**Product:**
\[ Z = \text{(CH}_3)_2\text{SiCl}_2 \]

### Summary of Products
- \( X = \text{Na}_2\text{SiO}_3 \)
- \( Y = \text{SiF}_4 \)
- \( Z = \text{(CH}_3)_2\text{SiCl}_2 \)

### Final Answer
Thus, the final products are:
- \( X = \text{Na}_2\text{SiO}_3 \)
- \( Y = \text{SiF}_4 \)
- \( Z = \text{(CH}_3)_2\text{SiCl}_2 \)