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NDA 2025
Exam
NDA
Year
2025
Subject
General Ability
Chapter
General Science

NDA 2025 · General Ability · General Science

Which one of the following is an endothermic reaction?

Which one of the following is an endothermic reaction?

Options

  1. ACH4(g)+2O2(g)→CO2(g)+2O2(g)CH_4(g) + 2O_2(g) \rightarrow CO_2(g) + 2O_2(g)
  2. BC6H12O6(aq)+6O2(g)→6CO2(g)+6H2O(l)C_6H_{12}O_6(aq) + 6O_2(g) \rightarrow 6CO_2(g) + 6H_2O(l)
  3. CN2(g)+3H2(g)→2NH3(g)N_2(g) + 3H_2(g) \rightarrow 2NH_3(g)
  4. D2Pb(NO3)2(s)→2PbO(s)+4NO2(g)+O2(g)2Pb(NO_3)_2(s) \rightarrow 2PbO(s) + 4NO_2(g) + O_2(g)

Correct answer

D. 2Pb(NO3)2(s)→2PbO(s)+4NO2(g)+O2(g)2Pb(NO_3)_2(s) \rightarrow 2PbO(s) + 4NO_2(g) + O_2(g)

Step-by-step solution

Combustion of methane (CH_4)isanexothermicreactionasitreleasesheat.<br><br>Theoxidationofglucose(C6H12O6) is an exothermic reaction as it releases heat.<br><br>The oxidation of glucose (C_6H_{12}O_6) during respiration is an exothermic process that provides energy to living cells.

The synthesis of ammonia (NH_3)fromnitrogenandhydrogen(Haberprocess)isanexothermicreaction.<br><br>Thethermaldecompositionofleadnitrate(Pb(NO3)2) from nitrogen and hydrogen (Haber process) is an exothermic reaction.<br><br>The thermal decomposition of lead nitrate (Pb(NO_3)_2) requires heat to break down the reactant into simpler products (PbO,,NO_2,and, andO_2).Sinceheatisabsorbed,itisanendothermicreaction.<br><br>Answer:2Pb(NO3)2(s)→2PbO(s)+4NO2(g)+O2(g)). Since heat is absorbed, it is an endothermic reaction.<br><br>Answer: 2Pb(NO_3)_2(s) \rightarrow 2PbO(s) + 4NO_2(g) + O_2(g)
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