Question

2. Zinc granules on treating with an acid X, form zinc sulphate salt along with the
evolution of a gas Y which burns with a pop sound when brought near to a
burning candle. Identify the acid X and gas evolved Y.

I)X-Sulphuric acid and Y- Oxygen gas
ii)X-Hydrochloric acid and Y-Oxygen gas
iii)X-Sulphuric acid and Y- Hydrogen gas
IV)X-Hydrochloric acid and Y- Hydrogen gas​

Answer 1

Answer:

Zn + H2SO4 ____ ZnSO4 + H2

hydrogen gives pop sound

the correct answer is sulphuric acid and hydrogen gas

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Answer 2

Answer:

• Zinc granules (Zn)
• Acid X
• Zinc Sulphate (ZnSO4)
• Gas Y

Acccording to the information given in the question, zinc granules react with acid X to form zinc sulphate and a gas Y.

So, Zn + X —> ZnSO4 + Y

Now, the question says that when the gas is brought near a candle a Pop sound is produced.

We know that, the pop sound produced when brought near a candle is a feature of hydrogen gas.

Hence, Y = hydrogen gas.

So, Zn + X —> ZnSO4 + H2

Now, we see the presence of zinc on both the sides in equal amount, so zinc is balanced.

Now, the unbalanced molecules in the right side is SO4 and H2.

We know that, H2SO4 is an acid.

Hence, we can conclude X = H2SO4.

So, the balanced equation for the activity given in the question will be :

Zn + H2SO4 —> ZnSO4 + Y.