the addition of a catalyst during a chemical reaction

The addition of a catalyst during a chemical reaction alters which of the following quantities?

A. Internal energy

B. Enthalpy

C. Activation energy

D. Entropy

Answer : Activation energy

Solution :
A catalyst is a substance which alters the reaction rate but itself remains unchanged in amount and chemical composition at the end of the reaction. It provides a new reaction path with a lower energy barrier ( lowering activation energy ).
Chemical Thermodynamics mcq solution image

Chemical Thermodynamics mcq solution image

Releted MCQ Question on
Physical Chemistry >> Chemical Thermodynamics

Releted Question 1

The difference between heats of reaction at constant pressure and constant volume for the reaction : $$2{C_6}{H_6}\left( l \right) + 15{O_{2\left( g \right)}} \to $$ $$12C{O_2}\left( g \right) + 6{H_2}O\left( l \right)$$ at $${25^ \circ }C$$ in $$kJ$$ is

A. $$-$$ 7.43

B. $$+$$ 3.72

C. $$-$$ 3.72

D. $$+$$ 7.43

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Releted Question 2

For which change $$\Delta H \ne \Delta E\,:$$

A. $${H_{2\left( g \right)}} + {I_{2\left( g \right)}} \to 2HI\left( g \right)$$

B. $$HC{\text{l}} + NaOH \to NaC{\text{l}}$$

C. $${C_{\left( s \right)}} + {O_{{2_{\left( g \right)}}}} \to C{o_{{2_{\left( g \right)}}}}$$

D. $${N_2}\left( g \right) + 3{H_2}\left( g \right) \to 2N{H_3}\left( g \right)$$

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Releted Question 3

$${\text{The}}\,\Delta H_f^0\,{\text{for}}\,C{O_2}\left( g \right),\,CO\left( g \right)\,$$ and $${H_2}O\left( g \right)$$ are $$-393.5,$$ $$-110.5$$ and $$ - 241.8\,kJ\,mo{l^{ - 1}}$$ respectively. The standard enthalpy change ( in $$kJ$$ ) for the reaction $$C{O_2}\left( g \right) + {H_2}\left( g \right) \to CO\left( g \right) + {H_2}O\left( g \right)\,{\text{is}}$$

A. 524.1

B. 41.2

C. -262.5

D. -41.2

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Releted Question 4

In thermodynamics, a process is called reversible when

A. surroundings and system change into each other.

B. there is no boundary between system and surroundings.

C. the surroundings are always in equilibrium with the system.

D. the system changes into the surroundings spontaneously.

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The addition of a catalyst during a chemical reaction alters which of the following quantities?

Releted MCQ Question on
Physical Chemistry >> Chemical Thermodynamics

The difference between heats of reaction at constant pressure and constant volume for the reaction : $$2{C_6}{H_6}\left( l \right) + 15{O_{2\left( g \right)}} \to $$ $$12C{O_2}\left( g \right) + 6{H_2}O\left( l \right)$$ at $${25^ \circ }C$$ in $$kJ$$ is

For which change $$\Delta H \ne \Delta E\,:$$

In thermodynamics, a process is called reversible when

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Chemical Thermodynamics

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The addition of a catalyst during a chemical reaction alters which of the following quantities?

Releted MCQ Question on Physical Chemistry >> Chemical Thermodynamics

The difference between heats of reaction at constant pressure and constant volume for the reaction : $$2{C_6}{H_6}\left( l \right) + 15{O_{2\left( g \right)}} \to $$ $$12C{O_2}\left( g \right) + 6{H_2}O\left( l \right)$$ at $${25^ \circ }C$$ in $$kJ$$ is

For which change $$\Delta H \ne \Delta E\,:$$

In thermodynamics, a process is called reversible when

Practice More Releted MCQ Question on Chemical Thermodynamics

Practice More MCQ Question on Chemistry Section

Releted MCQ Question on
Physical Chemistry >> Chemical Thermodynamics

Practice More Releted MCQ Question on
Chemical Thermodynamics