The heats of neutralisation of acids $A, B, C$ and $D$ with $N a O H$ are -13.5 K.cal, -12.7 K.cal, -11.8 K.cal, -12.4 K.cal respectively. The weakest acid is:

A

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B

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C

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D

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Solution

The correct option is C $C$
The heat of the neutralization of acid and base is maximum in the case of neutralization of strong acid and strong base.

Since the base is $N a O H$ which is the stronger base so the case in which the heat evolved is minimum is the weakest acid that is $C$ .

Option C is correct.

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Similar questions

The heat of combustion of $C H$ $_{4}$ (g), $C$ (graphite) and $H$ $_{4}$ (g) are respectively $- 20 k . c a l$ , $- 40 k . c a l$ and $- 10 k . c a l$ . The heat of formation of CH $_{4}$ is

If x K.cal and y K.cals are the $Δ$ H values of ionisation of weak acid (WA) and weak base (WB) respectively, $Δ$ H of neutralisation of the WA and WB is

Δ H_{f} =

-98.2 K.Cal/mole

S_{N a} =

36 K.Cal/mole

I_{N a} =

118.5 K.Cal/mole

\frac{1}{2} D_{C l_{2}} =

29 K.Cal/mole

U_{N a C l} =

-184.2 K.Cal/mole
From the data given below for

N a C l

, the electron affinity of chlorine

[- E_{a}]

is:

The standard heats of formation in K.cal mol $^{- 1}$ of NO $_{2 (g)}$ and N $_{2}$ O $_{4 (g)}$ are 8.0 and 2.0 respectively. The heat of dimerisation of $N O_{2}$ in K.cal is $2 N O_{2 (g)} \to N_{2} O_{4 (g)}$

Q. Heat of combustion of

C_{2} H_{4}

- 337 K . c a l

. If 11.35 lit

O_{2}

is used at STP, in the combustion heat liberated is ___________

K . c a l

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The heats of neutralisation of acids A, B, C and D with NaOH are -13.5 K.cal, -12.7 K.cal, -11.8 K.cal, -12.4 K.cal respectively. The weakest acid is:

The correct option is C CThe heat of the neutralization of acid and base is maximum in the case of neutralization of strong acid and strong base.Since the base is NaOH which is the stronger base so the case in which the heat evolved is minimum is the weakest acid that is C.Option C is correct.

The heats of neutralisation of acids $A, B, C$ and $D$ with $N a O H$ are -13.5 K.cal, -12.7 K.cal, -11.8 K.cal, -12.4 K.cal respectively. The weakest acid is: