The correct statements among (a) to (d ) regarding `H_(2)` as a fuel are :
(a) It Produces less pollutants than petrol.
(b) A cylinder if compressed dihydrogen weight `~ 30 `times more than a petrol tank producing the same amount of energy
( c ) Dihydrogen is stored in tanks of metal alloys like `NaNi_(5)`
( D) On combusion ,values of energy released per gram of liqiud dihydrogen and LPG are 50 and 142 kJ respectively

Options

A. (b),(c) and (d) only
B. (a),(b),(c) only
C. (b) and (d) only
D. (a) and (c) only

Explanation

To solve the question regarding the statements about hydrogen (H₂) as a fuel, we will analyze each statement one by one.

### Step 1: Analyze Statement (a)
**Statement (a):** It produces less pollutants than petrol.

**Analysis:** Hydrogen is considered a zero-emission fuel. When burned, it primarily produces water vapor as a byproduct, unlike petrol, which releases carbon dioxide (CO₂), nitrogen oxides (NOx), and other pollutants. Therefore, this statement is **true**.

### Step 2: Analyze Statement (b)
**Statement (b):** A cylinder of compressed dihydrogen weighs ~30 times more than a petrol tank producing the same amount of energy.

**Analysis:** Hydrogen has a high calorific value, which means it can produce a large amount of energy per unit mass. However, the storage of hydrogen in compressed form requires heavy tanks, making the overall weight of the hydrogen storage system significantly more than that of petrol tanks for the same energy output. Thus, this statement is also **true**.

### Step 3: Analyze Statement (c)
**Statement (c):** Dihydrogen is stored in tanks of metal alloys like NaNi₅.

**Analysis:** Hydrogen is indeed stored in various forms, including metal hydrides. NaNi₅ (sodium nickel alloy) is one of the alloys used for hydrogen storage. Therefore, this statement is **true**.

### Step 4: Analyze Statement (d)
**Statement (d):** On combustion, the values of energy released per gram of liquid hydrogen and LPG are 50 and 142 kJ respectively.

**Analysis:** The energy released per gram of liquid hydrogen is approximately 120-142 kJ/g, while LPG (Liquefied Petroleum Gas) releases about 50-55 kJ/g. This means that the energy released by liquid hydrogen is significantly higher than that of LPG, making this statement **false**.

### Conclusion
Based on the analysis:
- Statement (a) is **true**.
- Statement (b) is **true**.
- Statement (c) is **true**.
- Statement (d) is **false**.

Thus, the correct statements regarding H₂ as a fuel are (a), (b), and (c).

### Final Answer
The correct statements are (a), (b), and (c).

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