(a) 1500 and 3500 K

(b) 3000 and 3500 K

(c) 1000, 1500 and 3000 K

(d) 1500, 3000 and 3500 K

Answer: 1000, 1500 and 3000 K

For the reaction to be spontaneous : $\Delta G < 0$

$\Delta G = \Delta H - T\Delta S$

$\Delta G = -283 \times 10^3 J - T(-87 Jk^{-1})$

Since, $ \Delta G < 0$

$\Longrightarrow-283 \times 10^3 J + T \times 87 Jk^{-1} < 0$

$\Longrightarrow T \times 87 Jk^{-1} < 283 \times 10^3 J$

$\Longrightarrow T < \frac{283 \times 10^3}{87} K$

$\Longrightarrow T< 3252.8 K$

$\therefore$ reaction is spontaneous at 1000, 1500 and 3000 K.

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