The product p of the nuclear reaction

${}_{92}{}^{235}\mathrm{U} + {}_0{}^1\mathrm{n} \to \mathrm{p} + {}_{36}{}^{92}\mathrm{Kr} + 3{}_0{}^1\mathrm{n}$, is

• ${}_{56}{}^{141}\mathrm{Sr}$

• ${}_{56}{}^{141}\mathrm{La}$

• ${}_{56}{}^{141}\mathrm{Ba}$

• ${}_{56}{}^{141}\mathrm{Cs}$

Which is correct for an enothermic reaction?

• $∆$H is positive

• $∆$H is negative

• $∆$E is negative

• $∆$H= zero

Ionisation depends upon :

• pressure

• volume

• dilution

• none of these

Under isothermal condition, a gas at 300 K expands from 0.1 L to 0.25 L against a constant external pressure of 2 bar. The work done by the gas is:(Given that 1 L bar = 100 J)

• 5 kJ

• 25 J

• 30 J

• -30 J

705.

In which case change in entropy is negative?

• Expansion of a gas at constant temperature

• Sublimation of solid to gas

• 2H(g) → H₂(g)

• Evaporation of water

For the reaction,

A (g) + 2B (g) → 2C (g) + 3D (g)

the change of enthalpy at 27°C is 19 kcal. The value of $∆$E is

• 21.2 kcal

• 17.8 kcal

• 18.4 kcal

• 20.6 kcal