QBManager

CHXI11:THE P-BLOCK ELEMENTS

316340 Among the follwoing, the correct order of acidity is:

1

HClO < {HClO}_{2} < {HClO}_{3} < {HClO}_{4}

2

{HClO}_{2} < HClO < {HClO}_{3} < {HClO}_{4}

3

{HClO}_{4} < {HClO}_{2} < HClO < {HClO}_{3}

4

{HClO}_{3} < {HClO}_{4} < {HClO}_{2} < HClO

Explanation:

As oxidation number of central atom increases, acidic nature increases.
$HClO < {HClO}_{2} < {HClO}_{3} < {HClO}_{4}$

NEET - 2016

CHXI11:THE P-BLOCK ELEMENTS

316341 Which one of the following is present as an active ingredient in bleaching powder for bleaching action?

1

Ca (OCl)_{2}

2

{CaO}_{2} Cl

3

{CaCl}_{2}

4

{CaOCl}_{2}

Explanation:

Bleaching powder is $C a {(O C l)}_{2} \cdot C a C l_{2} \cdot C a {(O H)}_{2} \cdot H_{2} O$
$C a {(O C l)}_{2}$ is active ingredient in bleaching powder of bleaching action.

CHXI11:THE P-BLOCK ELEMENTS

316342 Assertion :
${HClO}_{4}$ is a stronger acid than ${HClO}_{3}$ .
Reason :
Oxidation state of $Cl$ in ${HClO}_{4}$ is +8 and in ${HClO}_{3}$ is +5 .

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

Acid strength of oxyacids of the same halogen increases with increase in oxidation number of the halogens. Oxidation number of $Cl$ in ${HClO}_{4}$ is +7 and in ${HClO}_{3}$ is +5 . So option (3) is correct.

CHXI11:THE P-BLOCK ELEMENTS

316343 The correct order of increasing hydration energy of the following conjugate bases of oxyacids of chlorine is

1

{ClO}^{-} < {ClO}_{2}^{-} < {ClO}_{3}^{-} < {ClO}_{4}^{-}

2

{ClO}_{4}^{-} < {ClO}_{3}^{-} < {ClO}_{2}^{-} < {ClO}^{-}

3

{ClO}_{4}^{-} < {ClO}_{3}^{-} < {ClO}^{-} < {ClO}_{2}^{-}

4

{ClO}_{3}^{-} < {ClO}_{4}^{-} < {ClO}_{2}^{-} < {ClO}^{-}

Explanation:

Hydration energy varies inversely with size. Among the given oxyacids, ${ClO}_{4}^{-}$ has the smallest size because of the presence of ${Cl}^{7 +}$ followed by ${ClO}_{3}^{-}$ (with ${Cl}^{5 +}$ ) and ${ClO}_{2}^{-}$ (with ${Cl}^{3 +}$ ) $\cdot {ClO}^{-}$ has the largest size with ${Cl}^{+}$ ion. Hence, the order of increasing hydration energy is ${ClO}^{-} < {ClO}_{2}^{-} < {ClO}_{3}^{-} < {ClO}_{4}^{-}$

CHXI11:THE P-BLOCK ELEMENTS

316340 Among the follwoing, the correct order of acidity is:

1

HClO < {HClO}_{2} < {HClO}_{3} < {HClO}_{4}

2

{HClO}_{2} < HClO < {HClO}_{3} < {HClO}_{4}

3

{HClO}_{4} < {HClO}_{2} < HClO < {HClO}_{3}

4

{HClO}_{3} < {HClO}_{4} < {HClO}_{2} < HClO

Explanation:

As oxidation number of central atom increases, acidic nature increases.
$HClO < {HClO}_{2} < {HClO}_{3} < {HClO}_{4}$

NEET - 2016

CHXI11:THE P-BLOCK ELEMENTS

316341 Which one of the following is present as an active ingredient in bleaching powder for bleaching action?

1

Ca (OCl)_{2}

2

{CaO}_{2} Cl

3

{CaCl}_{2}

4

{CaOCl}_{2}

Explanation:

Bleaching powder is $C a {(O C l)}_{2} \cdot C a C l_{2} \cdot C a {(O H)}_{2} \cdot H_{2} O$
$C a {(O C l)}_{2}$ is active ingredient in bleaching powder of bleaching action.

CHXI11:THE P-BLOCK ELEMENTS

316342 Assertion :
${HClO}_{4}$ is a stronger acid than ${HClO}_{3}$ .
Reason :
Oxidation state of $Cl$ in ${HClO}_{4}$ is +8 and in ${HClO}_{3}$ is +5 .

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

Acid strength of oxyacids of the same halogen increases with increase in oxidation number of the halogens. Oxidation number of $Cl$ in ${HClO}_{4}$ is +7 and in ${HClO}_{3}$ is +5 . So option (3) is correct.

CHXI11:THE P-BLOCK ELEMENTS

316343 The correct order of increasing hydration energy of the following conjugate bases of oxyacids of chlorine is

1

{ClO}^{-} < {ClO}_{2}^{-} < {ClO}_{3}^{-} < {ClO}_{4}^{-}

2

{ClO}_{4}^{-} < {ClO}_{3}^{-} < {ClO}_{2}^{-} < {ClO}^{-}

3

{ClO}_{4}^{-} < {ClO}_{3}^{-} < {ClO}^{-} < {ClO}_{2}^{-}

4

{ClO}_{3}^{-} < {ClO}_{4}^{-} < {ClO}_{2}^{-} < {ClO}^{-}

Explanation:

Hydration energy varies inversely with size. Among the given oxyacids, ${ClO}_{4}^{-}$ has the smallest size because of the presence of ${Cl}^{7 +}$ followed by ${ClO}_{3}^{-}$ (with ${Cl}^{5 +}$ ) and ${ClO}_{2}^{-}$ (with ${Cl}^{3 +}$ ) $\cdot {ClO}^{-}$ has the largest size with ${Cl}^{+}$ ion. Hence, the order of increasing hydration energy is ${ClO}^{-} < {ClO}_{2}^{-} < {ClO}_{3}^{-} < {ClO}_{4}^{-}$

CHXI11:THE P-BLOCK ELEMENTS

316340 Among the follwoing, the correct order of acidity is:

1

HClO < {HClO}_{2} < {HClO}_{3} < {HClO}_{4}

2

{HClO}_{2} < HClO < {HClO}_{3} < {HClO}_{4}

3

{HClO}_{4} < {HClO}_{2} < HClO < {HClO}_{3}

4

{HClO}_{3} < {HClO}_{4} < {HClO}_{2} < HClO

Explanation:

As oxidation number of central atom increases, acidic nature increases.
$HClO < {HClO}_{2} < {HClO}_{3} < {HClO}_{4}$

NEET - 2016

CHXI11:THE P-BLOCK ELEMENTS

316341 Which one of the following is present as an active ingredient in bleaching powder for bleaching action?

1

Ca (OCl)_{2}

2

{CaO}_{2} Cl

3

{CaCl}_{2}

4

{CaOCl}_{2}

Explanation:

Bleaching powder is $C a {(O C l)}_{2} \cdot C a C l_{2} \cdot C a {(O H)}_{2} \cdot H_{2} O$
$C a {(O C l)}_{2}$ is active ingredient in bleaching powder of bleaching action.

CHXI11:THE P-BLOCK ELEMENTS

316342 Assertion :
${HClO}_{4}$ is a stronger acid than ${HClO}_{3}$ .
Reason :
Oxidation state of $Cl$ in ${HClO}_{4}$ is +8 and in ${HClO}_{3}$ is +5 .

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

Acid strength of oxyacids of the same halogen increases with increase in oxidation number of the halogens. Oxidation number of $Cl$ in ${HClO}_{4}$ is +7 and in ${HClO}_{3}$ is +5 . So option (3) is correct.

CHXI11:THE P-BLOCK ELEMENTS

316343 The correct order of increasing hydration energy of the following conjugate bases of oxyacids of chlorine is

1

{ClO}^{-} < {ClO}_{2}^{-} < {ClO}_{3}^{-} < {ClO}_{4}^{-}

2

{ClO}_{4}^{-} < {ClO}_{3}^{-} < {ClO}_{2}^{-} < {ClO}^{-}

3

{ClO}_{4}^{-} < {ClO}_{3}^{-} < {ClO}^{-} < {ClO}_{2}^{-}

4

{ClO}_{3}^{-} < {ClO}_{4}^{-} < {ClO}_{2}^{-} < {ClO}^{-}

Explanation:

Hydration energy varies inversely with size. Among the given oxyacids, ${ClO}_{4}^{-}$ has the smallest size because of the presence of ${Cl}^{7 +}$ followed by ${ClO}_{3}^{-}$ (with ${Cl}^{5 +}$ ) and ${ClO}_{2}^{-}$ (with ${Cl}^{3 +}$ ) $\cdot {ClO}^{-}$ has the largest size with ${Cl}^{+}$ ion. Hence, the order of increasing hydration energy is ${ClO}^{-} < {ClO}_{2}^{-} < {ClO}_{3}^{-} < {ClO}_{4}^{-}$

CHXI11:THE P-BLOCK ELEMENTS

316340 Among the follwoing, the correct order of acidity is:

1

HClO < {HClO}_{2} < {HClO}_{3} < {HClO}_{4}

2

{HClO}_{2} < HClO < {HClO}_{3} < {HClO}_{4}

3

{HClO}_{4} < {HClO}_{2} < HClO < {HClO}_{3}

4

{HClO}_{3} < {HClO}_{4} < {HClO}_{2} < HClO

Explanation:

As oxidation number of central atom increases, acidic nature increases.
$HClO < {HClO}_{2} < {HClO}_{3} < {HClO}_{4}$

NEET - 2016

CHXI11:THE P-BLOCK ELEMENTS

316341 Which one of the following is present as an active ingredient in bleaching powder for bleaching action?

1

Ca (OCl)_{2}

2

{CaO}_{2} Cl

3

{CaCl}_{2}

4

{CaOCl}_{2}

Explanation:

Bleaching powder is $C a {(O C l)}_{2} \cdot C a C l_{2} \cdot C a {(O H)}_{2} \cdot H_{2} O$
$C a {(O C l)}_{2}$ is active ingredient in bleaching powder of bleaching action.

CHXI11:THE P-BLOCK ELEMENTS

316342 Assertion :
${HClO}_{4}$ is a stronger acid than ${HClO}_{3}$ .
Reason :
Oxidation state of $Cl$ in ${HClO}_{4}$ is +8 and in ${HClO}_{3}$ is +5 .

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

Acid strength of oxyacids of the same halogen increases with increase in oxidation number of the halogens. Oxidation number of $Cl$ in ${HClO}_{4}$ is +7 and in ${HClO}_{3}$ is +5 . So option (3) is correct.

CHXI11:THE P-BLOCK ELEMENTS

316343 The correct order of increasing hydration energy of the following conjugate bases of oxyacids of chlorine is

1

{ClO}^{-} < {ClO}_{2}^{-} < {ClO}_{3}^{-} < {ClO}_{4}^{-}

2

{ClO}_{4}^{-} < {ClO}_{3}^{-} < {ClO}_{2}^{-} < {ClO}^{-}

3

{ClO}_{4}^{-} < {ClO}_{3}^{-} < {ClO}^{-} < {ClO}_{2}^{-}

4

{ClO}_{3}^{-} < {ClO}_{4}^{-} < {ClO}_{2}^{-} < {ClO}^{-}

Explanation:

Hydration energy varies inversely with size. Among the given oxyacids, ${ClO}_{4}^{-}$ has the smallest size because of the presence of ${Cl}^{7 +}$ followed by ${ClO}_{3}^{-}$ (with ${Cl}^{5 +}$ ) and ${ClO}_{2}^{-}$ (with ${Cl}^{3 +}$ ) $\cdot {ClO}^{-}$ has the largest size with ${Cl}^{+}$ ion. Hence, the order of increasing hydration energy is ${ClO}^{-} < {ClO}_{2}^{-} < {ClO}_{3}^{-} < {ClO}_{4}^{-}$

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