(A) is a colourless solid, it metal when heated and gives of a gas (B) Which is supporter of combustion , if heating is contimed the white of the solid disuppears , When (A) is heatyed with an aqueous `NaOH` solution , an alkaline gas (C ) is evolved ,When gas(B) is leasted with sodumine ,a colourless solid (D) is formed .When (D) is heated with dil `H_(2)SO_(4)` a colourless liquid (F) is formed .
The mass of compound E is

Options

A. Ammonia
B. Hydrazoic acid
C. Hydrogen amide
D. None of these

Explanation

To solve the problem step by step, we will identify the compounds (A, B, C, D, and E) based on the given information and reactions.

### Step 1: Identify Compound A
- **Given:** A is a colorless solid metal that, when heated, gives off a gas (B) which is a supporter of combustion.
- **Analysis:** A common colorless solid that fits this description is **ammonium nitrate (NH4NO3)**. When heated, it decomposes to produce nitrous oxide (N2O), which is a supporter of combustion.

### Step 2: Reaction of Compound A
- **Reaction:**
\[ 2 \, NH_4NO_3 \, (s) \rightarrow N_2O \, (g) + 2 \, H_2O \, (g) \]
- **Conclusion:** Thus, gas B is **N2O**.

### Step 3: Identify Compound C
- **Given:** When A is heated with aqueous NaOH, an alkaline gas (C) is evolved.
- **Analysis:** When ammonium nitrate reacts with sodium hydroxide, it produces ammonia gas (NH3), which is alkaline.

### Step 4: Reaction with NaOH
- **Reaction:**
\[ NH_4NO_3 \, (s) + NaOH \, (aq) \rightarrow NH_3 \, (g) + NaNO_3 \, (aq) + H_2O \, (l) \]
- **Conclusion:** Thus, gas C is **NH3**.

### Step 5: Identify Compound D
- **Given:** When gas B (N2O) is treated with sodium, a colorless solid (D) is formed.
- **Analysis:** When nitrous oxide (N2O) reacts with sodium, it forms sodium azide (NaN3), which is a colorless solid.

### Step 6: Reaction of Gas B with Sodium
- **Reaction:**
\[ N_2O \, (g) + 2 \, Na \, (s) \rightarrow NaN_3 \, (s) + NaOH \, (aq) \]
- **Conclusion:** Thus, compound D is **sodium azide (NaN3)**.

### Step 7: Identify Compound E
- **Given:** When D (sodium azide) is heated with dilute sulfuric acid (H2SO4), a colorless liquid (F) is formed.
- **Analysis:** Sodium azide reacts with dilute sulfuric acid to produce hydrazoic acid (HN3) and sodium bisulfate (NaHSO4).

### Step 8: Reaction of D with H2SO4
- **Reaction:**
\[ NaN_3 \, (s) + H_2SO_4 \, (aq) \rightarrow HN_3 \, (l) + NaHSO_4 \, (aq) \]
- **Conclusion:** Thus, compound E is **hydrazoic acid (HN3)**.

### Final Answer
The mass of compound E (hydrazoic acid) can be calculated using its molar mass:
- Molar mass of HN3 = 1 (H) + 14*3 (N) = 1 + 42 = 43 g/mol.

### Summary of Compounds
- A: Ammonium nitrate (NH4NO3)
- B: Nitrous oxide (N2O)
- C: Ammonia (NH3)
- D: Sodium azide (NaN3)
- E: Hydrazoic acid (HN3)