StudentAidUnit 5: Energetics — Mcqs
9th Class Chemistry · Unit 5: Energetics
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Multiple Choice Questions (Exercise)
1.The following reaction is an exothermic reaction. H2 + Cl2 → 2HCl (Sunlight). From where does the energy come to break the bond of H2 and Cl?
2.Which of the following reactions has the least value of activation energy
3.Formation of which hydrogen halide from the elements is an endothermic reaction?
4.What are the products of anaerobic respiration?
5.Which reaction do you expect to be a reversible reaction? (Options are reaction coordinate diagrams showing Energy vs Path of Reaction)
6.What does it show when a chemical reaction is exothermic?
- a It shows the bonds which break are weaker than those are formed.
- b It shows the bond which break are stronger than those are formed.
- c Exothermic nature of the reaction is not concerned with bond formation or bond breakage.
- d It shows that the reactants are more stable than the products.
7.When NaOH and HCl are mixed the temperature increases. The reaction is:
8.The average bond dissociation energy for the C – H bond is 412 kJ mol^-1. Which of the following process will have enthalpy change close to 412 kJ mol^-1.
9.The average bond energies for O-O and O = O are 146 and 496 kJ/mol respectively. Find the enthalpy in kJ for the following reaction? H—O—O—H(q) → H—O—H(q) + 1/2 O=(g)
10.Why does the following exothermic reaction not occur? C → C ΔH=3kJ/mol (Diamond) (Graphite)
SLO Based Additional MCQ's - Introduction
11.When old bonds are broken, the energy is:
12.When new bonds are formed, the energy is:
System and Surrounding
13.All chemical reactions involve:
14.Who use the word energy for the 1st time:
15.The word energy is used in physics for the first time:
- a 1802
- b 1805
- c 1858
- d 1902
16.The part of the universe that we want to focus our attention called _______.
Enthalpy
17.The enthalpy of reaction C + O2 → CO2
18.The enthalpy of reaction 2H2 + O2 → 2H2O
19.The enthalpy of reaction C + 1/2 O2 → CO
20.The enthalpy of reaction H2 + I2 → 2HI
Exothermic and Endothermic Reaction
21.If the ΔH value is negative then reaction will be:
22.If ΔH0 is positive then reaction will be:
23.Bond formation energy of one O-H bond is :
- a 484 kJ/mol
- b 486 kJ/mol
- c 488 kJ/mol
- d None
24.Bond dissociation for H2 is:
25.Bond dissociation for O2 is:
26.Formation of NO is __________:
How does a Reaction take place?
27.Activation energy of a chemical reaction must be ________ the average kinetic energy of reacting molecules.
28.No reaction occurs if the energy of reacting particles ________ activation energy.
29.Washing clothes at 140°F uses almost the energy as at 140°F wash:
Aerobic and Anaerobic Respiration
30.________ of the energy used by traditional electric bulb is wasted in producing heat:
31.Which is not produced in an aerobic respiration?
32.________ acts as reserve energy sources.
33.Which is released in anaerobic respiration?
34.Aerobic respiration releases ________ energy than anaerobic respiration.
35.________ acts a catalyst promoting the breakdown of ozone.
36.During the glycolysis net ATP produced are: