Chemistry - 9 Chapter - 10Chemical EnergeticsTest - 6

Chemistry - 9 Chapter - 10
Chemical Energetics
Test - 6

1. Heat of chemical reaction taking place at constant pressure of called ______.

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2. If heat is absorbed during a chemical reaction, it is called an exothermic reaction.

a) True
b) False

3. The total energy of the products increase during an endothermic reaction.

a) False
b) True

4. 53.6 kJ heat energy is required to carry out a chemical reaction, and then 65.88 kJ heat energy will be evolved when the reaction will take place in the reverse direction.

a) True
b) False

5. Enthalpy of a substance is also called its heat content.

a) True
b) False

6. One mole of hydrogen chloride gas is produced when half a mole of hydrogen gas reacts with half a mole of chlorine gas.

a) False
b) True

7. What will be the property of the solution obtained by mixing 50cm of 0.1 M hydrochloric acid solution with 50cm3 of 0.1M sodium hydroxide solution?

a) None of three
b) Neutral
c) Basic
d) Acidic

8. Heat of reaction is:

a) The heat evolved or absorbed during a chemical reaction taking place at any constant pressure.
b) The heat evolved or absorbed during a chemical reaction taking place at any pressure.
c) The heat evolve during a chemical reacton.
d) The heat absorbed during a chemical reaction

9. During an endothermic reaction:

a) The total energy of the products decreases.
b) The apparatus used is cooled down.
c) Both (b) and (c) are correct.
d) The total energy of the products increases.

10. During an exothermic reaction:

a) The apparatus used to gets hot.
b) The total energy of the products decreases.
c) The apparatus used is cooled down.

11. Heat content of a substance depends upon:

a) Its physical state
b) Its temperature
c) Its physical state and its temperature.

12. Why a polystyrene cup is used instead of a glass beaker to find out the heat of neutralization? Short..Answer…….Remember.by.Heart…………….
In neutralization reaction, heat is evolved. Polystyrene cup is an insulator. It also does not absorb or transmit heat. So the results are more accurate than the results obtained by using glass.
a) In neutralization reaction, heat is evolved. Polystyrene cup is an insulator. It also does not absorb or transmit heat. So the results are less accurate than the results obtained by using glass.
b) In neutralization reaction, heat is evolved. Polystyrene cup is an insulator. It also does not absorb or transmit heat. So the results are more accurate than the results obtained by using glass.

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