Chemistry questions
29404 published questions with worked solutions.
- C + O_2 CO_2 ; H = -396 kJ mol^ -1 . Heat liberated in formation of 0.154 kg of CO_2 is _____
- Hess's law of heat summation includes _____ [AFMC 1992]
- Heat of formation of H_2O_ (l) , CO_ 2(g) and C_2H_ 4(g) are -285.0, -399.0 and 69.9 kJ/mole respectively. The heat of combustion...
- Heats of formation of ethane, ethylene, acetylene and CO_2 are -136.9, -66.9, -228 and -395.39 (all in kJ) respectively. Stablest...
- _fH of HCl is _____ (Given: 2HCl H_2 + Cl_2 ; H = -185 kcal) [MH CET 2006]
- Heat of formation of water is -272 kJ. How much water can be decomposed by 750 kJ of heat? [MH CET 2011]
- Considering entropy (S) as a thermodynamic parameter, the criterion for the spontaneity of any process is _____ [CBSE PMT 2004]
- A reaction occurs spontaneously if _____ [MP PET 2002, CBSE PMT 2005]
- One mole of NaCl_ (s) on melting absorbed 30.5 kJ of heat and its entropy is increased by 28.8 J K^ -1 . The melting point of...
- Adsorption of gases on solid surface is generally exothermic because _____ [IIT JEE Screening 2004]Not in JEE Main or NEET syllabus
- If the enthalpy of vaporization for water is 186.5 kJ mol^ -1 , the entropy of its vaporization will be _____ [CPMT 1988, DCE...
- For the reaction, X_2O_ 4(l) 2 ,XO_ 2(g) ; U = 2.1 kcal, S = 20 cal K^ -1 at 300 K. Hence, G is _____
- If an endothermic reaction is non-spontaneous at freezing point of water and becomes feasible at its boiling point, then _____...
- Values of H and S for give different reactions are given below Reaction: H (kJ mol^ -1 ); S (J K^ -1 mol^ -1 ) I: +98.0; +14.8...
- Which of the following statements is CORRECT for a reversible process in a state of equilibrium? [AIPMT 2015]
- The unit of entropy is _____ [CBSE PMT 2002]
- The standard enthalpy or the decomposition of N_2O_5 to NO_2 is 58.04 kJ and standard entropy of this reaction is 176.7 J/K. The...
- For reaction; Ag_2O_ (s) 2Ag_ (s) + 12O_ 2(g) , the value of H = 30.56 kJ mol^ -1 and S = 0.0666 kJ K^ -1 mol^ -1 . Temperature...
- What is the entropy change (in J K^ -1 mol^ -1 ) when one mole of ice is converted into water at 0^ ? (The enthalpy change for...
- The standard entropies of CO_ 2(g) , C_ (s) and O_ 2(g) are 213.5, 5.740 and 205 J K^ -1 respectively. The standard entropy of...