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Which of the following statements are not correct.
A) For isothermal process $Δ U = 0$
B) The heat content of the products is more than that of the reactants in an exothermic reaction
C) The heat of neutralisation between HCl and NaOH always equal to --57.3 KJ / mole
D) A system is said to be closed system if it can neither exchange matter nor energy with the surroundings

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B & D only

A & B only

A & C only

A,B,C

answer is B.

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Detailed Solution

$(A) Δ U = nCvΔ T$

For isothermal $Δ T = 0 \Rightarrow Δ U = 0$

$(B) H_{P} > H_{R} “H= +Ve, endothermic$

$(C) H_{3} {BO}_{3} + H_{2} O \to {[B (OH)_{4}]}^{-} + H_{3} O^{\oplus}$

(D) In Isolated system both matter and energy not exchanged with surroundings

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