9th Class Chemistry Chapter 5 TestEnergetics

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

1. In which form the energy is stored in a molecule?

   1. Chemical energy

   2. Heat energy

   3. Elastic potential

   4. Mechanical energy

2. A catalyst does what to the activation energy of reactions?

   1. Increases it

   2. Decrease it

   3. Has no effect

   4. None of these

3. Formation of which hydrogen halide from the elements is an endothermic reaction?

   1. HCI

   2. HF

   3. HBr

   4. HI

4. Which one of the following is not related to exothermic reaction?

   1. Heat energy evolved

   2. Heat goes to the surrounding

   3. Reaction container gets hot

   4. Temperature of surrounding decrease

5. The enthalpy of reaction 2H₂ + O₂ 2H₂O:

   1. 

   2. 

   3. 

   4. 

6. The primary storage form of glucose is:

   1. Glycogen

   2. Glycoside

   3. Nuclic acids

   4. All of these

7. ...... acts as reserve energy sources:

   1. Vitamins

   2. Proteins

   3. Lipids

   4. Enzyme

8. Which one of the following is example of exothermic process?

   1. Digestion of food

   2. Burning of fossil fuels

   3. Firework

   4. All of these

9. 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?

   1. CH_4(g)  C_(g) + 2H_2(g)

   2. CH_4(g) C_(g) + 2H_2(g)

   3. CH_4(g) C_(g) + 4H_(g)

   4. CH_4(g) CH_3(g) + H_(g)

10. The enthalpy of reaction H₂ + I₂  2HI:

    1. 

    2. 

    3. 

    4.