316652
Statement A : The elements of the group 14 are slightly more electronegative than group 13 elements Statement B : Group 14 elements are larger in size than group 13 elements.
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.
Explanation:
Group 14 elements are actually smaller in size than group 13 elements. Group 14 elements are slightly more electronegative than the latter.
CHXI11:THE P-BLOCK ELEMENTS
316653
Covalently bonded molecules with hardest nature are:
Diamond, \({{\text{B}}_{\text{4}}}{\text{C,}}\,\,{\text{SiC}}\) are hardest molecules used as abrasives.
CHXI11:THE P-BLOCK ELEMENTS
316654
How many molecules of water of crystallization are present in one molecule of borax?
1 8
2 10
3 5
4 2
Explanation:
The formula of borax is \({\rm{N}}{{\rm{a}}_{\rm{2}}}{{\rm{B}}_{\rm{4}}}{{\rm{O}}_{\rm{7}}} \cdot {\rm{10}}{{\rm{H}}_{\rm{2}}}{\rm{O}}\) However, it contains tetranuclear unit\({\left[ {{{\rm{B}}_{\rm{4}}}{{\rm{O}}_{\rm{5}}}{{\left( {{\rm{OH}}} \right)}_{\rm{4}}}} \right]^{{\rm{2}} - }}\). So, the formula is \({\mathrm{\mathrm{Na}_{2}\left[\mathrm{~B}_{4} \mathrm{O}_{5}(\mathrm{OH})_{4}\right] \cdot 8 \mathrm{H}_{2} \mathrm{O}}}\).
CHXI11:THE P-BLOCK ELEMENTS
316655
Among the following the one that can accept a pair of electrons in the formation of a coordinate bond is (I) \(\mathrm{NH}_{4}^{+}\) (II) \(\mathrm{AlCl}_{3}\) (III) \(\mathrm{CH}_{4}\) (IV) \({\rm{B}}{{\rm{F}}_{\rm{3}}}\)
1 I, II, IV
2 II, IV
3 I, III
4 I, IV
Explanation:
\(\mathrm{AlCl}_{3}\) while dimerising forms coordinate bonds \(\mathrm{BF}_{3}\) while adding to \(\mathrm{NH}_{3}\) forms coordinate bond
CHXI11:THE P-BLOCK ELEMENTS
316656
Assertion : If aluminium atoms replace a few silicon atoms in three dimensional network of silicon dioxide, the overall structure acquires a negative charge. Reason : Aluminium is trivalent while silicon is tetravalent.
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.
316652
Statement A : The elements of the group 14 are slightly more electronegative than group 13 elements Statement B : Group 14 elements are larger in size than group 13 elements.
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.
Explanation:
Group 14 elements are actually smaller in size than group 13 elements. Group 14 elements are slightly more electronegative than the latter.
CHXI11:THE P-BLOCK ELEMENTS
316653
Covalently bonded molecules with hardest nature are:
Diamond, \({{\text{B}}_{\text{4}}}{\text{C,}}\,\,{\text{SiC}}\) are hardest molecules used as abrasives.
CHXI11:THE P-BLOCK ELEMENTS
316654
How many molecules of water of crystallization are present in one molecule of borax?
1 8
2 10
3 5
4 2
Explanation:
The formula of borax is \({\rm{N}}{{\rm{a}}_{\rm{2}}}{{\rm{B}}_{\rm{4}}}{{\rm{O}}_{\rm{7}}} \cdot {\rm{10}}{{\rm{H}}_{\rm{2}}}{\rm{O}}\) However, it contains tetranuclear unit\({\left[ {{{\rm{B}}_{\rm{4}}}{{\rm{O}}_{\rm{5}}}{{\left( {{\rm{OH}}} \right)}_{\rm{4}}}} \right]^{{\rm{2}} - }}\). So, the formula is \({\mathrm{\mathrm{Na}_{2}\left[\mathrm{~B}_{4} \mathrm{O}_{5}(\mathrm{OH})_{4}\right] \cdot 8 \mathrm{H}_{2} \mathrm{O}}}\).
CHXI11:THE P-BLOCK ELEMENTS
316655
Among the following the one that can accept a pair of electrons in the formation of a coordinate bond is (I) \(\mathrm{NH}_{4}^{+}\) (II) \(\mathrm{AlCl}_{3}\) (III) \(\mathrm{CH}_{4}\) (IV) \({\rm{B}}{{\rm{F}}_{\rm{3}}}\)
1 I, II, IV
2 II, IV
3 I, III
4 I, IV
Explanation:
\(\mathrm{AlCl}_{3}\) while dimerising forms coordinate bonds \(\mathrm{BF}_{3}\) while adding to \(\mathrm{NH}_{3}\) forms coordinate bond
CHXI11:THE P-BLOCK ELEMENTS
316656
Assertion : If aluminium atoms replace a few silicon atoms in three dimensional network of silicon dioxide, the overall structure acquires a negative charge. Reason : Aluminium is trivalent while silicon is tetravalent.
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.
316652
Statement A : The elements of the group 14 are slightly more electronegative than group 13 elements Statement B : Group 14 elements are larger in size than group 13 elements.
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.
Explanation:
Group 14 elements are actually smaller in size than group 13 elements. Group 14 elements are slightly more electronegative than the latter.
CHXI11:THE P-BLOCK ELEMENTS
316653
Covalently bonded molecules with hardest nature are:
Diamond, \({{\text{B}}_{\text{4}}}{\text{C,}}\,\,{\text{SiC}}\) are hardest molecules used as abrasives.
CHXI11:THE P-BLOCK ELEMENTS
316654
How many molecules of water of crystallization are present in one molecule of borax?
1 8
2 10
3 5
4 2
Explanation:
The formula of borax is \({\rm{N}}{{\rm{a}}_{\rm{2}}}{{\rm{B}}_{\rm{4}}}{{\rm{O}}_{\rm{7}}} \cdot {\rm{10}}{{\rm{H}}_{\rm{2}}}{\rm{O}}\) However, it contains tetranuclear unit\({\left[ {{{\rm{B}}_{\rm{4}}}{{\rm{O}}_{\rm{5}}}{{\left( {{\rm{OH}}} \right)}_{\rm{4}}}} \right]^{{\rm{2}} - }}\). So, the formula is \({\mathrm{\mathrm{Na}_{2}\left[\mathrm{~B}_{4} \mathrm{O}_{5}(\mathrm{OH})_{4}\right] \cdot 8 \mathrm{H}_{2} \mathrm{O}}}\).
CHXI11:THE P-BLOCK ELEMENTS
316655
Among the following the one that can accept a pair of electrons in the formation of a coordinate bond is (I) \(\mathrm{NH}_{4}^{+}\) (II) \(\mathrm{AlCl}_{3}\) (III) \(\mathrm{CH}_{4}\) (IV) \({\rm{B}}{{\rm{F}}_{\rm{3}}}\)
1 I, II, IV
2 II, IV
3 I, III
4 I, IV
Explanation:
\(\mathrm{AlCl}_{3}\) while dimerising forms coordinate bonds \(\mathrm{BF}_{3}\) while adding to \(\mathrm{NH}_{3}\) forms coordinate bond
CHXI11:THE P-BLOCK ELEMENTS
316656
Assertion : If aluminium atoms replace a few silicon atoms in three dimensional network of silicon dioxide, the overall structure acquires a negative charge. Reason : Aluminium is trivalent while silicon is tetravalent.
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.
316652
Statement A : The elements of the group 14 are slightly more electronegative than group 13 elements Statement B : Group 14 elements are larger in size than group 13 elements.
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.
Explanation:
Group 14 elements are actually smaller in size than group 13 elements. Group 14 elements are slightly more electronegative than the latter.
CHXI11:THE P-BLOCK ELEMENTS
316653
Covalently bonded molecules with hardest nature are:
Diamond, \({{\text{B}}_{\text{4}}}{\text{C,}}\,\,{\text{SiC}}\) are hardest molecules used as abrasives.
CHXI11:THE P-BLOCK ELEMENTS
316654
How many molecules of water of crystallization are present in one molecule of borax?
1 8
2 10
3 5
4 2
Explanation:
The formula of borax is \({\rm{N}}{{\rm{a}}_{\rm{2}}}{{\rm{B}}_{\rm{4}}}{{\rm{O}}_{\rm{7}}} \cdot {\rm{10}}{{\rm{H}}_{\rm{2}}}{\rm{O}}\) However, it contains tetranuclear unit\({\left[ {{{\rm{B}}_{\rm{4}}}{{\rm{O}}_{\rm{5}}}{{\left( {{\rm{OH}}} \right)}_{\rm{4}}}} \right]^{{\rm{2}} - }}\). So, the formula is \({\mathrm{\mathrm{Na}_{2}\left[\mathrm{~B}_{4} \mathrm{O}_{5}(\mathrm{OH})_{4}\right] \cdot 8 \mathrm{H}_{2} \mathrm{O}}}\).
CHXI11:THE P-BLOCK ELEMENTS
316655
Among the following the one that can accept a pair of electrons in the formation of a coordinate bond is (I) \(\mathrm{NH}_{4}^{+}\) (II) \(\mathrm{AlCl}_{3}\) (III) \(\mathrm{CH}_{4}\) (IV) \({\rm{B}}{{\rm{F}}_{\rm{3}}}\)
1 I, II, IV
2 II, IV
3 I, III
4 I, IV
Explanation:
\(\mathrm{AlCl}_{3}\) while dimerising forms coordinate bonds \(\mathrm{BF}_{3}\) while adding to \(\mathrm{NH}_{3}\) forms coordinate bond
CHXI11:THE P-BLOCK ELEMENTS
316656
Assertion : If aluminium atoms replace a few silicon atoms in three dimensional network of silicon dioxide, the overall structure acquires a negative charge. Reason : Aluminium is trivalent while silicon is tetravalent.
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.
316652
Statement A : The elements of the group 14 are slightly more electronegative than group 13 elements Statement B : Group 14 elements are larger in size than group 13 elements.
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.
Explanation:
Group 14 elements are actually smaller in size than group 13 elements. Group 14 elements are slightly more electronegative than the latter.
CHXI11:THE P-BLOCK ELEMENTS
316653
Covalently bonded molecules with hardest nature are:
Diamond, \({{\text{B}}_{\text{4}}}{\text{C,}}\,\,{\text{SiC}}\) are hardest molecules used as abrasives.
CHXI11:THE P-BLOCK ELEMENTS
316654
How many molecules of water of crystallization are present in one molecule of borax?
1 8
2 10
3 5
4 2
Explanation:
The formula of borax is \({\rm{N}}{{\rm{a}}_{\rm{2}}}{{\rm{B}}_{\rm{4}}}{{\rm{O}}_{\rm{7}}} \cdot {\rm{10}}{{\rm{H}}_{\rm{2}}}{\rm{O}}\) However, it contains tetranuclear unit\({\left[ {{{\rm{B}}_{\rm{4}}}{{\rm{O}}_{\rm{5}}}{{\left( {{\rm{OH}}} \right)}_{\rm{4}}}} \right]^{{\rm{2}} - }}\). So, the formula is \({\mathrm{\mathrm{Na}_{2}\left[\mathrm{~B}_{4} \mathrm{O}_{5}(\mathrm{OH})_{4}\right] \cdot 8 \mathrm{H}_{2} \mathrm{O}}}\).
CHXI11:THE P-BLOCK ELEMENTS
316655
Among the following the one that can accept a pair of electrons in the formation of a coordinate bond is (I) \(\mathrm{NH}_{4}^{+}\) (II) \(\mathrm{AlCl}_{3}\) (III) \(\mathrm{CH}_{4}\) (IV) \({\rm{B}}{{\rm{F}}_{\rm{3}}}\)
1 I, II, IV
2 II, IV
3 I, III
4 I, IV
Explanation:
\(\mathrm{AlCl}_{3}\) while dimerising forms coordinate bonds \(\mathrm{BF}_{3}\) while adding to \(\mathrm{NH}_{3}\) forms coordinate bond
CHXI11:THE P-BLOCK ELEMENTS
316656
Assertion : If aluminium atoms replace a few silicon atoms in three dimensional network of silicon dioxide, the overall structure acquires a negative charge. Reason : Aluminium is trivalent while silicon is tetravalent.
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.
