Study of Compounds
ICSE · Class 10 · Chemistry
Flashcards for Study of Compounds — ICSE Class 10 Chemistry. Quick Q&A cards covering key concepts, definitions, and formulas.
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Explore the full setWhat is the laboratory method for preparing Hydrogen Chloride gas? Write the chemical equation.
Answer
Laboratory method: Heating sodium chloride with concentrated sulphuric acid at 200°C. Equation: NaCl + H2SO4 → NaHSO4 + HCl(g)↑ Apparatus: Round bottom flask with thistle funnel, delivery tube throu…
Why is HCl gas collected by upward displacement of air and not over water?
Answer
HCl gas is collected by upward displacement of air because: 1. It is 1.27 times heavier than air (VD of HCl = 18.25) 2. It cannot be collected over water because it is highly soluble in water (452 vol…
Describe the fountain experiment for HCl gas and explain the observations.
Answer
Setup: Round bottom flask with dry HCl gas, fitted with jet tube and water dropper, inverted over blue litmus solution. Procedure: Press dropper to add water. Observation: Red fountain forms. Expla…
What is aqua regia? Write its composition and use.
Answer
Aqua regia is a mixture of 1 part conc. HNO3 and 3 parts conc. HCl by volume. Reaction: HNO3 + 3HCl → NOCl + 2H2O + 2[Cl] Use: Dissolves noble metals like gold and platinum due to nascent chlorine: …
Why is inverted funnel arrangement used in laboratory preparation of HCl acid?
Answer
The inverted funnel arrangement prevents back suction. Reason: HCl gas is highly soluble in water, creating partial vacuum when it dissolves. This could cause water to rise up a simple delivery tube …
What is the laboratory preparation of ammonia from ammonium chloride? Write the equation and conditions.
Answer
Reactants: Ammonium chloride (NH4Cl) and calcium hydroxide [Ca(OH)2] in 2:3 ratio by weight. Equation: 2NH4Cl + Ca(OH)2 → CaCl2 + 2H2O + 2NH3↑ Conditions: Heat the mixture Apparatus: Round bottom f…
Why cannot conc. H2SO4, P2O5, and anhydrous CaCl2 be used for drying ammonia gas?
Answer
These drying agents react chemically with ammonia: 1. 2NH3 + H2SO4 → (NH4)2SO4 2. 6NH3 + P2O5 + 3H2O → 2(NH4)3PO4 3. 4NH3 + CaCl2 → CaCl2·4NH3 Instead, quick lime (CaO) is used as it only absorbs mo…
Describe Haber's process for manufacture of ammonia. Include conditions and equation.
Answer
Equation: N2 + 3H2 ⇌ 2NH3 + 93.6 kJ/mol Conditions: - Temperature: 450-500°C (optimum) - Pressure: 200-900 atm - Catalyst: Finely divided iron with molybdenum promoter Process: Compressed N2 and H2 …
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