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Which one of the following does not result in the evolution of H2 gas?
- a)Zinc and hydrochloric acid
- b)Iron and sulphuric acid
- c)Magnesium and very dilute nitric acid
- d)Aluminium and nitric acid
Correct answer is option 'D'. Can you explain this answer?
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Most Upvoted Answer
Which one of the following does not result in the evolution of H2 gas?...
- Hydrogen gas is not evolved when there is a reaction between metal and Nitric acid (HNO3)occurs as Nitric acid is a strong oxidizing agent.
- The Hydrogen gas produced during the reaction with metal gets oxidized to H2O, hence no hydrogen gas is produced.
- Instead, it evolves nitric oxides such as NO2,NO etc.
- Example: When a Silver metal reacts with Nitric acid (HNO3)to give N2O and H2O.
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Community Answer
Which one of the following does not result in the evolution of H2 gas?...
Explanation:
The reaction between a metal and an acid usually results in the evolution of hydrogen gas. However, there are certain conditions under which this reaction may not occur. In this case, we are given four different reactions and we have to identify which one does not result in the evolution of H2 gas.
Zinc and hydrochloric acid:
When zinc reacts with hydrochloric acid, it undergoes a displacement reaction and produces zinc chloride and hydrogen gas. The balanced chemical equation for this reaction is:
Zn + 2HCl → ZnCl2 + H2
Iron and sulphuric acid:
When iron reacts with sulfuric acid, it also undergoes a displacement reaction and produces iron(II) sulfate and hydrogen gas. The balanced chemical equation for this reaction is:
Fe + H2SO4 → FeSO4 + H2
Magnesium and very dilute nitric acid:
When magnesium reacts with nitric acid, it undergoes a redox reaction and produces magnesium nitrate, nitrogen dioxide gas, and water. The balanced chemical equation for this reaction is:
3Mg + 8HNO3 → 3Mg(NO3)2 + 2NO + 4H2O
Aluminium and nitric acid:
When aluminium reacts with nitric acid, it also undergoes a redox reaction and produces aluminium nitrate, nitrogen dioxide gas, and water. The balanced chemical equation for this reaction is:
2Al + 6HNO3 → 2Al(NO3)3 + 3H2O + 3NO2
From the above equations, we can see that all the reactions except the one involving aluminium and nitric acid result in the evolution of hydrogen gas. Therefore, the correct answer is option 'D' - Aluminium and nitric acid.
The reaction between a metal and an acid usually results in the evolution of hydrogen gas. However, there are certain conditions under which this reaction may not occur. In this case, we are given four different reactions and we have to identify which one does not result in the evolution of H2 gas.
Zinc and hydrochloric acid:
When zinc reacts with hydrochloric acid, it undergoes a displacement reaction and produces zinc chloride and hydrogen gas. The balanced chemical equation for this reaction is:
Zn + 2HCl → ZnCl2 + H2
Iron and sulphuric acid:
When iron reacts with sulfuric acid, it also undergoes a displacement reaction and produces iron(II) sulfate and hydrogen gas. The balanced chemical equation for this reaction is:
Fe + H2SO4 → FeSO4 + H2
Magnesium and very dilute nitric acid:
When magnesium reacts with nitric acid, it undergoes a redox reaction and produces magnesium nitrate, nitrogen dioxide gas, and water. The balanced chemical equation for this reaction is:
3Mg + 8HNO3 → 3Mg(NO3)2 + 2NO + 4H2O
Aluminium and nitric acid:
When aluminium reacts with nitric acid, it also undergoes a redox reaction and produces aluminium nitrate, nitrogen dioxide gas, and water. The balanced chemical equation for this reaction is:
2Al + 6HNO3 → 2Al(NO3)3 + 3H2O + 3NO2
From the above equations, we can see that all the reactions except the one involving aluminium and nitric acid result in the evolution of hydrogen gas. Therefore, the correct answer is option 'D' - Aluminium and nitric acid.
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Which one of the following does not result in the evolution of H2 gas?a)Zinc and hydrochloric acidb)Iron and sulphuric acidc)Magnesium and very dilute nitric acidd)Aluminium and nitric acidCorrect answer is option 'D'. Can you explain this answer?
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