Energetics With Answers

Energetics

Sr. # Questions Answers Choice
1 Bond dissocialation for H2 is 435 kJ/mol 440 kJ/mol 430 kJ/mol 445 kJ/mol
2 Bond formation energy of one O-H bond is............ 488 kJ/mol 484 kJ/mol 486 kJ/mol 489 kJ/mol
3 If the Delta H value is negative then reaction witll be Endotermic Exothermic May or may not be exothermic or endothermic None of these
4 The enthalpy of reaction H2+I2--- 2HI -571.6 k J +53.8 kJ 11 kJ -393.5 kJ
5 The enthalpy of reaction 2H2 +O2-----2H2O -571.6 kJ -110.5 kJ -393.5 kJ +53.8 kJ
6 The enthalpy of reaction C+O2 ------ CO2 -571.6 kJ -393.5 kJ +53.8 kJ -110.5 kJ
7 The part of the universe that we want to focus our attention called. Surrounding Energy System Both a and b
8 The word energy is used in physics ofr the firt time. 1902 1858 1805 1802
9 Who use the word energy for the 1st time Rutherford Bohr Thomas Young None of these
10 All chemical reaction involves. Enzymes Catalyst Energy changes All of these
11 When NaOH and HCl are mixed the temperature increases. The reaction Exothermic with a negative enthalpy chagne. Endothermic with a positive enthaly change. Endothermic with a negatie enthalpy change Exothermic with a positive enthealpy change
12 When new bonds ae formed, the energy is Consume Remain same Release None of these
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