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CHXI10:THE S-BLOCK ELEMENTS

315852 Statement A :
$B e$ and $Mg$ do not impart characteristic colour to the flame.
Statement B :
Both Be and Mg have high ionization energy.

1 Statement A is correct but Statement B is incorrect.

2 Statement A is incorrect but Statement B is correct.

3 Both statements are correct.

4 Both Statements are incorrect.

CHXI10:THE S-BLOCK ELEMENTS

315853 Assertion :
$Mg$ does not impart characteristic colours to the Bunsen-burner flame.
Reason :
Ionisation potential of $Mg$ is very high.

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.

CHXI10:THE S-BLOCK ELEMENTS

315854 A chloride dissolves appreciably in cold water. When placed on a platinum wire in Bunsen flame, no distinctive colour is noticed. The cation is

1

{Mg}^{2 +}

2

{Ba}^{2 +}

3

{Pb}^{2 +}

4

{Ca}^{2 +}

Explanation:

${MgCl}_{2}$ is soluble in cold water but ${PbCl}_{2}$ is insoluble. Both ${Mg}^{2 +}$ and ${Pb}^{2 +}$ do not impart any colour to Bunsen flame.

CHXI10:THE S-BLOCK ELEMENTS

315855 For Group -2 elements, which one of the following trends is incorrect?

1 Ionization enthalpy:

Be < Mg < Ca < Sr <

Ba

2 Hydration enthalpy:

Be > Mg > Ca > Sr >

Ba

3 Density:

Be > Mg > Ca > Sr > Ba

4 Atomic radius:

Be < Mg < Ca < Sr < Ba

Explanation:

Density (in g/cc) order: $Be (1.84) > Mg$ (1.74) $> Ca (1.55) < Sr (2.63) < Ba (3.59) [The$ given values as per NCERT]

CHXI10:THE S-BLOCK ELEMENTS

315852 Statement A :
$B e$ and $Mg$ do not impart characteristic colour to the flame.
Statement B :
Both Be and Mg have high ionization energy.

1 Statement A is correct but Statement B is incorrect.

2 Statement A is incorrect but Statement B is correct.

3 Both statements are correct.

4 Both Statements are incorrect.

CHXI10:THE S-BLOCK ELEMENTS

315853 Assertion :
$Mg$ does not impart characteristic colours to the Bunsen-burner flame.
Reason :
Ionisation potential of $Mg$ is very high.

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.

CHXI10:THE S-BLOCK ELEMENTS

315854 A chloride dissolves appreciably in cold water. When placed on a platinum wire in Bunsen flame, no distinctive colour is noticed. The cation is

1

{Mg}^{2 +}

2

{Ba}^{2 +}

3

{Pb}^{2 +}

4

{Ca}^{2 +}

Explanation:

${MgCl}_{2}$ is soluble in cold water but ${PbCl}_{2}$ is insoluble. Both ${Mg}^{2 +}$ and ${Pb}^{2 +}$ do not impart any colour to Bunsen flame.

CHXI10:THE S-BLOCK ELEMENTS

315855 For Group -2 elements, which one of the following trends is incorrect?

1 Ionization enthalpy:

Be < Mg < Ca < Sr <

Ba

2 Hydration enthalpy:

Be > Mg > Ca > Sr >

Ba

3 Density:

Be > Mg > Ca > Sr > Ba

4 Atomic radius:

Be < Mg < Ca < Sr < Ba

Explanation:

Density (in g/cc) order: $Be (1.84) > Mg$ (1.74) $> Ca (1.55) < Sr (2.63) < Ba (3.59) [The$ given values as per NCERT]

CHXI10:THE S-BLOCK ELEMENTS

315852 Statement A :
$B e$ and $Mg$ do not impart characteristic colour to the flame.
Statement B :
Both Be and Mg have high ionization energy.

1 Statement A is correct but Statement B is incorrect.

2 Statement A is incorrect but Statement B is correct.

3 Both statements are correct.

4 Both Statements are incorrect.

CHXI10:THE S-BLOCK ELEMENTS

315853 Assertion :
$Mg$ does not impart characteristic colours to the Bunsen-burner flame.
Reason :
Ionisation potential of $Mg$ is very high.

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.

CHXI10:THE S-BLOCK ELEMENTS

315854 A chloride dissolves appreciably in cold water. When placed on a platinum wire in Bunsen flame, no distinctive colour is noticed. The cation is

1

{Mg}^{2 +}

2

{Ba}^{2 +}

3

{Pb}^{2 +}

4

{Ca}^{2 +}

Explanation:

${MgCl}_{2}$ is soluble in cold water but ${PbCl}_{2}$ is insoluble. Both ${Mg}^{2 +}$ and ${Pb}^{2 +}$ do not impart any colour to Bunsen flame.

CHXI10:THE S-BLOCK ELEMENTS

315855 For Group -2 elements, which one of the following trends is incorrect?

1 Ionization enthalpy:

Be < Mg < Ca < Sr <

Ba

2 Hydration enthalpy:

Be > Mg > Ca > Sr >

Ba

3 Density:

Be > Mg > Ca > Sr > Ba

4 Atomic radius:

Be < Mg < Ca < Sr < Ba

Explanation:

Density (in g/cc) order: $Be (1.84) > Mg$ (1.74) $> Ca (1.55) < Sr (2.63) < Ba (3.59) [The$ given values as per NCERT]

CHXI10:THE S-BLOCK ELEMENTS

315852 Statement A :
$B e$ and $Mg$ do not impart characteristic colour to the flame.
Statement B :
Both Be and Mg have high ionization energy.

1 Statement A is correct but Statement B is incorrect.

2 Statement A is incorrect but Statement B is correct.

3 Both statements are correct.

4 Both Statements are incorrect.

CHXI10:THE S-BLOCK ELEMENTS

315853 Assertion :
$Mg$ does not impart characteristic colours to the Bunsen-burner flame.
Reason :
Ionisation potential of $Mg$ is very high.

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.

CHXI10:THE S-BLOCK ELEMENTS

315854 A chloride dissolves appreciably in cold water. When placed on a platinum wire in Bunsen flame, no distinctive colour is noticed. The cation is

1

{Mg}^{2 +}

2

{Ba}^{2 +}

3

{Pb}^{2 +}

4

{Ca}^{2 +}

Explanation:

${MgCl}_{2}$ is soluble in cold water but ${PbCl}_{2}$ is insoluble. Both ${Mg}^{2 +}$ and ${Pb}^{2 +}$ do not impart any colour to Bunsen flame.

CHXI10:THE S-BLOCK ELEMENTS

315855 For Group -2 elements, which one of the following trends is incorrect?

1 Ionization enthalpy:

Be < Mg < Ca < Sr <

Ba

2 Hydration enthalpy:

Be > Mg > Ca > Sr >

Ba

3 Density:

Be > Mg > Ca > Sr > Ba

4 Atomic radius:

Be < Mg < Ca < Sr < Ba

Explanation:

Density (in g/cc) order: $Be (1.84) > Mg$ (1.74) $> Ca (1.55) < Sr (2.63) < Ba (3.59) [The$ given values as per NCERT]