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Doctors Medicines MCQs Q&A

Which of the following is/are true/false?  Statement: A. The following is an example of a reversible reaction. N2 (g) + 3H2 (g) \(\rightleftharpoons\) ∵ 2NH3 (g) B. The following is an example of thermal decomposition. CaCO3 (s) \(\xrightarrow{heat}\) Cao(s) + CO2(g)

Which of the following is/are true/false?  Statement: A. The following is an example of a reversible reaction. N2 (g) + 3H2 (g) \(\rightleftharpoons\) ∵ 2NH3 (g) B. The following is an example of thermal decomposition. CaCO3 (s) \(\xrightarrow{heat}\) Cao(s) + CO2(g) Correct Answer Both A and B are ture

The correct answer is Both A and B are true.

Key Points

  • Thermal decomposition:
    • Thermal decomposition is a chemical reaction where heat is a reactant.
    • Since heat is a reactant, these reactions are endothermic meaning that the reaction requires thermal energy to break the chemical bonds in the molecule.
    • Calcium carbonate, CaCO3, will decompose into carbon dioxide, CO2, and calcium oxide, CaO, when heated above 900 degrees Celcius at a pressure of the atmosphere. 

Additional Information

  • Reversible reaction:
    • ​A reversible reaction is a reaction in which the conversion of reactants to products and the conversion of products to reactants occur simultaneously.
    • A and B can react to form C and D or, in the reverse reaction, C and D can react to form A and B. This is distinct from a reversible process in thermodynamics.
    • The forward reaction  N 2 ​ (g)+3H 2 ​ (g)<−−>2NH 3 ​ (g) (the production of ammonia) is exothermic.
    • According to Le Chatelier's Principle, this will be favoured if you lower the temperature, a very low temperature will cause a reaction to occur very slowly and hence, not efficiently.
    • Therefore, 400 - 450°C is a compromise temperature producing a high proportion of ammonia in the equilibrium mixture.

Related Questions

Which of the following statement(s) is/are true/false? A. The following is an example of a reversible reaction N2 (g) + 3H2 (g) 2NH3 (g) B. The following is an example of a thermal decomposition reaction: CaCO3 (S) sunlight CaO(s) + CO2 (g)
The treatment system includes a WAC, SAC, followed by a WBA and SBA. There is a degasser in this system. Calculate the amount of SBA resin required for the following data. M Alkalinity: 100 ppm as CaCO3 P Alkalinity: 100 ppm as CaCO3 Silica: 30 ppm as CaCO3 CO2: 45 ppm as CaCO3 EMA: 100 ppm as CaCO3 Capacity: 37 Kg/m3 Correction factor: 0.9 Flow rate: 35 m3/hr Operation hours: 10 hrs
The treatment system includes a WAC, SAC, followed by a WBA and SBA. There is no degasser in this system. Calculate the amount of resin required for the following information. M Alkalinity: 100 ppm as CaCO3 P Alkalinity: 100 ppm as CaCO3 Silica: 45 ppm as CaCO3 CO2: 45 ppm as CaCO3 Capacity: 37 Kg/m3 Correction factor: 0.9 Flow rate: 35 m3/hr Operation hours: 10 hrs
If a sample water has not supplied any heat and having impurities as follows: Mg(HCO3)2=50 mg of CaCO3, MgSO4 = 100mg of CaCO3, CaCl2=200mg of CaCO3, Ca(NO3)2=100mg of CaCO3. Calculate the lime required for treatment of 10000 litres of water.
Find out whether the following reaction is spontaneous or not at 127 degrees centigrade? N2(g) + 3H2(g) \(\rightleftharpoons\) 2NH3(g); ΔH = 92.22 kJ/mol and ΔS = -198.75 J/K-mol.
The treatment system consists of a WAC, SAC which is followed by a WBA and SBA. Calculate the amount of WBA resin required for the following data. M Alkalinity: 100 ppm as CaCO3 P Alkalinity: 100 ppm as CaCO3 EMA: 25 ppm as CaCO3 Capacity: 37 Kg/m3 Correction factor: 0.9 Flow rate: 135 m3/hr Operation hours: 20 hrs
Calculate the SAC resin required for the following data. It should be noted that prior to the SAC, a WAC system is present. M Alkalinity: 100 ppm as CaCO3 P Alkalinity: 100 ppm as CaCO3 EMA: 50 ppm as CaCO3 Capacity: 57 Kg/m3 Correction factor: 0.9 Flow rate: 135 m3/hr Operation hours: 20 hrs
On a P-V diagram of an ideal gas, suppose a reversible adiabatic line intersects a reversible isothermal line at point A. Then at a point A, the slope of the reversible adiabatic line (∂P/∂V)S and the slope of the reversible isothermal line (∂P/∂V)T are related as (where, y = Cp/Cv) )
On a P-V diagram of an ideal gas, suppose a reversible adiabatic line intersects a reversible isothermal line at point A. Then at a point A, the slope of the reversible adiabatic line $${\left( {\frac{{\partial {\text{P}}}}{{\partial {\text{V}}}}} \right)_{\text{S}}}$$  and the slope of the reversible isothermal line $${\left( {\frac{{\partial {\text{P}}}}{{\partial {\text{V}}}}} \right)_{\text{T}}}$$  are related as (where, $${\text{y}} = \frac{{{{\text{C}}_{\text{p}}}}}{{{{\text{C}}_{\text{v}}}}}$$  )
The following reaction is an example of _________ N2 + 3H2 ⟶ 2NH3