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Chemistry-

General

Easy

Question

The efficiency of an enzyme in catalyzing a reaction is due to its capacity

(a) To form a strong enzyme-substrate complex
(b) To decrease the bond energy of all substrate molecules
(c) To change the shape of the substrate molecule
(d) To lower the activation energy of the reaction

The correct answer is: (d) To lower the activation energy of the reaction

Factual statement

Related Questions to study

The activation energy for the forward reaction $X rightwards arrow Y$ is $60 blank k J blank m o l to the power of negative 1 end exponent$ and $increment H$ is $negative 20 blank k J blank m o l to the power of negative 1 end exponent$ . The activation energy for the reverse reaction is

The activation energy for the forward reaction $X rightwards arrow Y$ is $60 blank k J blank m o l to the power of negative 1 end exponent$ and $increment H$ is $negative 20 blank k J blank m o l to the power of negative 1 end exponent$ . The activation energy for the reverse reaction is

Chemistry-General

For the reaction $A plus B rightwards arrow C plus D$ , doubling the concentration of both the reactants increases the reaction rate by 8 times and doubling the initial concentration of only B simply doubles the reaction rate. The rate law for the reaction is

For the reaction $A plus B rightwards arrow C plus D$ , doubling the concentration of both the reactants increases the reaction rate by 8 times and doubling the initial concentration of only B simply doubles the reaction rate. The rate law for the reaction is

Chemistry-General

The free energy change due to a reaction is zero when

The free energy change due to a reaction is zero when

Chemistry-General

parallel

The half life of a radioactive element is 20 min. The time interval between the stages of its 33% and 67% decay is

The half life of a radioactive element is 20 min. The time interval between the stages of its 33% and 67% decay is

Chemistry-General

$t subscript 1 divided by 2 end subscript equals$ constant confirms the first order of the reaction as one $a to the power of 2 end exponent t subscript 1 divided by 2 end subscript equals$ constant confirms that the reaction is of

$t subscript 1 divided by 2 end subscript equals$ constant confirms the first order of the reaction as one $a to the power of 2 end exponent t subscript 1 divided by 2 end subscript equals$ constant confirms that the reaction is of

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The potential energy diagram for a reaction $R rightwards arrow P$ is given below. $increment H to the power of ⊖ end exponent$ of the reaction corresponds to the energy

The potential energy diagram for a reaction $R rightwards arrow P$ is given below. $increment H to the power of ⊖ end exponent$ of the reaction corresponds to the energy

Chemistry-General

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The rate constant for the reaction $2 N subscript 2 end subscript O subscript 5 end subscript rightwards arrow 4 N O subscript 2 end subscript plus O subscript 2 end subscript$ Is $3.0 cross times 10 to the power of negative 5 end exponent s to the power of negative 1 end exponent$ . If the rate is $2.40 cross times 10 to the power of negative 5 end exponent blank m o l blank L to the power of negative 1 end exponent s to the power of negative 1 end exponent$ , then the concentration of $N subscript 2 end subscript O subscript 5 end subscript left parenthesis i n blank m o l blank L to the power of negative 1 end exponent right parenthesis$ is

The rate constant for the reaction $2 N subscript 2 end subscript O subscript 5 end subscript rightwards arrow 4 N O subscript 2 end subscript plus O subscript 2 end subscript$ Is $3.0 cross times 10 to the power of negative 5 end exponent s to the power of negative 1 end exponent$ . If the rate is $2.40 cross times 10 to the power of negative 5 end exponent blank m o l blank L to the power of negative 1 end exponent s to the power of negative 1 end exponent$ , then the concentration of $N subscript 2 end subscript O subscript 5 end subscript left parenthesis i n blank m o l blank L to the power of negative 1 end exponent right parenthesis$ is

Chemistry-General

Consider a reaction; $a G plus b H rightwards arrow P r o d u c t s$ When concentration of both the reactants G and H is doubled, the rate increases by eight times. However, when concentration of G is doubled keeping the concentration of H fixed, the rate is doubled. The overall of the reaction,

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Chemistry-General

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Statement 2: $B F subscript 3 end subscript$ has bond pair-lone pair electron ratio 1 : 3.

Statement 1: $B F subscript 3 end subscript$ molecule is planar with an angle of 120 ͦC.
Statement 2: $B F subscript 3 end subscript$ has bond pair-lone pair electron ratio 1 : 3.

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Statement 2:Electronegativity difference between Li and Cl is too small.

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Statement 2:Electronegativity difference between Li and Cl is too small.

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Statement 2:The two methoxy groups at para positions are located as

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Statement 2:The two methoxy groups at para positions are located as

Chemistry-General

parallel

Statement 1:The bond angle in $B F subscript 3 end subscript$ is smaller than that in $B F subscript 4 end subscript$ .
Statement 2: $B F subscript 3 end subscript$ has $s p to the power of 2 end exponent$ -hybridisation, whereas $B F subscript 4 end subscript superscript minus end superscript$ has $s p to the power of 3 end exponent$ -hybridisation.

Statement 1:The bond angle in $B F subscript 3 end subscript$ is smaller than that in $B F subscript 4 end subscript$ .
Statement 2: $B F subscript 3 end subscript$ has $s p to the power of 2 end exponent$ -hybridisation, whereas $B F subscript 4 end subscript superscript minus end superscript$ has $s p to the power of 3 end exponent$ -hybridisation.

Chemistry-General

Which of the following has maximum bond energy?

Which of the following has maximum bond energy?

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The hybride orbital of the central atom in $A l F subscript 4 end subscript superscript minus end superscript$ is

The hybride orbital of the central atom in $A l F subscript 4 end subscript superscript minus end superscript$ is

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parallel

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