Study the reaction given below and answer the questions that follow:
NaNO₃ + H₂SO₄ → NaHSO₄ + HNO₃ (below 200°C)
(a) Give one reason for maintaining the temperature below 200°C.
(b) Why is concentrated Sulphuric acid used in the above reaction?
Study the reaction given below and answer the questions that follow:
NaNO₃ + H₂SO₄ → NaHSO₄ + HNO₃ (below 200°C)
(a) Give one reason for maintaining the temperature below 200°C.
(b) Why is concentrated Sulphuric acid used in the above reaction?
Show Hint
Solution and Explanation
(a) Reason for temperature < 200°C:
Maintaining the temperature below 200°C is important for several reasons:
1. It prevents the formation of a hard crust of sodium sulphate (Na2SO4), which is difficult to remove from the glass retort.
2. It prevents the thermal decomposition of the product, nitric acid (HNO3).
3. It saves fuel and prevents the glass apparatus from cracking.
(b) Use of concentrated sulphuric acid:
Concentrated sulphuric acid is used because it is a non-volatile acid. It can displace the more volatile nitric acid from its salt (sodium nitrate) when heated.
Top ICSE Class X board Chemistry Questions
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- Alex was given a solution of an unknown salt Y for analysis. He performed the following tests and recorded his observations:
• To a part of the solution Y, he added silver nitrate solution and obtained a white precipitate which was soluble in ammonium hydroxide solution.
• To the remaining solution he added a few drops of sodium hydroxide solution and obtained a pale blue precipitate.
Based on the observations made by Alex, identify:
(a) the anion and
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Study the reaction scheme shown below and identify the reactants A, B and C.
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- "स्वस्थ जीवन के लिए संतुलित भोजन, व्यायाम तथा खेलकूद बहुत आवश्यक होता है" इस विषय को आधार बनाते हुए एक लेख लिखिए।
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नीचे दिए गए चित्र को ध्यान से देखिए और चित्र को आधार बनाकर कोई लेख, घटना अथवा कहानी लिखिए जिसका सीधा व स्पष्ट संबंध चित्र से होना चाहिए।
