Identify the incorrect statement from the following. NEET Previous Year Questions on The p-Block Elements [2024]

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Solution

Q.
Identify the incorrect statement from the following. [2024]

1 The acidic strength of HX (X = F, $Cl$ , Br and $I$ ) follows the order : $HF > HCl > HBr > HI$ .

2 Fluorine exhibits –1 oxidation state whereas other halogens exhibit +1, +3, +5 and +7 oxidation states also.

3 The enthalpy of dissociation of $F_{2}$ is smaller than that of ${Cl}_{2}$ .

4 Fluorine is stronger oxidising agent than chlorine.

Ans.
(1)

As the size of X increases down the group, H–X bond strength decreases and so the acid strength increases as $HF < HCl < HBr < HI .$

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Solution

Q. Identify the incorrect statement from the following. [2024]

1 The acidic strength of HX (X = F, Cl, Br and I) follows the order : HF>HCl>HBr>HI.

2 Fluorine exhibits –1 oxidation state whereas other halogens exhibit +1, +3, +5 and +7 oxidation states also.

3 The enthalpy of dissociation of F2 is smaller than that of Cl2.

4 Fluorine is stronger oxidising agent than chlorine.

Ans. (1) As the size of X increases down the group, H–X bond strength decreases and so the acid strength increases as HF<HCl<HBr<HI.

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Q.
Identify the incorrect statement from the following. [2024]

1 The acidic strength of HX (X = F, $Cl$ , Br and $I$ ) follows the order : $HF > HCl > HBr > HI$ .

3 The enthalpy of dissociation of $F_{2}$ is smaller than that of ${Cl}_{2}$ .

Ans.
(1)

As the size of X increases down the group, H–X bond strength decreases and so the acid strength increases as $HF < HCl < HBr < HI .$