The threshold energy of the reaction is when PE of B is $30 k J m o l^{- 1}$ .

130

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140

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123

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125

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Solution

The correct option is C $123$
$\frac{E_{f}}{E_{b}} = \frac{20}{31}$ (given). Also $E_{f} - E_{b} = - 33$ (given) ..... (i)
Substituting $E_{b} = \frac{31}{20} E_{f}$ , in equation (i) we get
$E_{f} - \frac{31}{20} E_{f} = - 33$
or $\frac{- 11}{20} E_{f} = - 33$ or $E_{f} = \frac{33 \times 20}{11} = 60 k J m o l^{- 1}$
$E_{b} = E_{f} + 33 = 60 + 33 = 93 k J m o l^{- 1}$
Thershold energy
$= E_{b} + P E$ of product
$= 93 + 30 = 123 k J m o l^{- 1}$

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Similar questions

A + B \to C

30 k J m o l^{- 1}

X k J m o l^{- 1}

Length(cm)	$120 - 125$	$125 - 130$	$130 - 135$	$135 - 140$	$140 - 145$	$145 - 150$
Number of plants	$8$	$10$	Y	$16$	$8$	$12$

The mean length of the plants is $136$ cm. Find y in the table.

123 \times 125 \times 127

124

S_{N} 1

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