Hydrogen Bonding
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NEET DIGITAL LIBRARY
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313607 KF combines with HF to form \({\rm{KH}}{{\rm{F}}_{\rm{2}}}\). The compound contains the species

1 \({{\rm{K}}^{\rm{ + }}}{\rm{,}}\,\,{{\rm{F}}^{\rm{ - }}}\,\,{\rm{and}}\,\,{{\rm{H}}^{\rm{ + }}}\)
2 \({{\rm{K}}^{\rm{ + }}}{\rm{,}}\,\,{{\rm{F}}^{\rm{ - }}}\,\,{\rm{and}}\,\,{\rm{HF}}\)
3 \({{\rm{K}}^{\rm{ + }}}\,\,{\rm{and}}\,\,{\left[ {{\rm{H}}{{\rm{F}}_{\rm{2}}}} \right]^{\rm{ - }}}\)
4 \({\left[ {{\rm{KHF}}} \right]^{\rm{ + }}}\,\,{\rm{and}}\,\,{{\rm{F}}_{\rm{2}}}\)
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313608 The coupling between base units of DNA is through

1 Hydrogen bonding
2 Electrostatic bonding
3 Covalent bonding
4 Vander Waal’s forces
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313609 Assertion :
The nearly tetrahedral arrangement of the orbitals about the oxygen atom allows each water molecule to form hydrogen bonds with as many as four neighbouring water molecules.
Reason :
In ice, each molecule forms four hydrogen bonds as each molecule is fixed in the space.

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.
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313610 \(\mathrm{NH}_{3}\) has higher boiling point than expected because

1 it forms \(\mathrm{NH}_{4} \mathrm{OH}\) with water
2 it has strong intermolecular hydrogen bonds
3 it has intramolecular hydrogen bonds
4 its density decreases on freezing
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CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313607 KF combines with HF to form \({\rm{KH}}{{\rm{F}}_{\rm{2}}}\). The compound contains the species

1 \({{\rm{K}}^{\rm{ + }}}{\rm{,}}\,\,{{\rm{F}}^{\rm{ - }}}\,\,{\rm{and}}\,\,{{\rm{H}}^{\rm{ + }}}\)
2 \({{\rm{K}}^{\rm{ + }}}{\rm{,}}\,\,{{\rm{F}}^{\rm{ - }}}\,\,{\rm{and}}\,\,{\rm{HF}}\)
3 \({{\rm{K}}^{\rm{ + }}}\,\,{\rm{and}}\,\,{\left[ {{\rm{H}}{{\rm{F}}_{\rm{2}}}} \right]^{\rm{ - }}}\)
4 \({\left[ {{\rm{KHF}}} \right]^{\rm{ + }}}\,\,{\rm{and}}\,\,{{\rm{F}}_{\rm{2}}}\)
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313608 The coupling between base units of DNA is through

1 Hydrogen bonding
2 Electrostatic bonding
3 Covalent bonding
4 Vander Waal’s forces
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313609 Assertion :
The nearly tetrahedral arrangement of the orbitals about the oxygen atom allows each water molecule to form hydrogen bonds with as many as four neighbouring water molecules.
Reason :
In ice, each molecule forms four hydrogen bonds as each molecule is fixed in the space.

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.
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313610 \(\mathrm{NH}_{3}\) has higher boiling point than expected because

1 it forms \(\mathrm{NH}_{4} \mathrm{OH}\) with water
2 it has strong intermolecular hydrogen bonds
3 it has intramolecular hydrogen bonds
4 its density decreases on freezing
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CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313607 KF combines with HF to form \({\rm{KH}}{{\rm{F}}_{\rm{2}}}\). The compound contains the species

1 \({{\rm{K}}^{\rm{ + }}}{\rm{,}}\,\,{{\rm{F}}^{\rm{ - }}}\,\,{\rm{and}}\,\,{{\rm{H}}^{\rm{ + }}}\)
2 \({{\rm{K}}^{\rm{ + }}}{\rm{,}}\,\,{{\rm{F}}^{\rm{ - }}}\,\,{\rm{and}}\,\,{\rm{HF}}\)
3 \({{\rm{K}}^{\rm{ + }}}\,\,{\rm{and}}\,\,{\left[ {{\rm{H}}{{\rm{F}}_{\rm{2}}}} \right]^{\rm{ - }}}\)
4 \({\left[ {{\rm{KHF}}} \right]^{\rm{ + }}}\,\,{\rm{and}}\,\,{{\rm{F}}_{\rm{2}}}\)
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313608 The coupling between base units of DNA is through

1 Hydrogen bonding
2 Electrostatic bonding
3 Covalent bonding
4 Vander Waal’s forces
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313609 Assertion :
The nearly tetrahedral arrangement of the orbitals about the oxygen atom allows each water molecule to form hydrogen bonds with as many as four neighbouring water molecules.
Reason :
In ice, each molecule forms four hydrogen bonds as each molecule is fixed in the space.

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.
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313610 \(\mathrm{NH}_{3}\) has higher boiling point than expected because

1 it forms \(\mathrm{NH}_{4} \mathrm{OH}\) with water
2 it has strong intermolecular hydrogen bonds
3 it has intramolecular hydrogen bonds
4 its density decreases on freezing
NEET DIGITAL LIBRARY
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313607 KF combines with HF to form \({\rm{KH}}{{\rm{F}}_{\rm{2}}}\). The compound contains the species

1 \({{\rm{K}}^{\rm{ + }}}{\rm{,}}\,\,{{\rm{F}}^{\rm{ - }}}\,\,{\rm{and}}\,\,{{\rm{H}}^{\rm{ + }}}\)
2 \({{\rm{K}}^{\rm{ + }}}{\rm{,}}\,\,{{\rm{F}}^{\rm{ - }}}\,\,{\rm{and}}\,\,{\rm{HF}}\)
3 \({{\rm{K}}^{\rm{ + }}}\,\,{\rm{and}}\,\,{\left[ {{\rm{H}}{{\rm{F}}_{\rm{2}}}} \right]^{\rm{ - }}}\)
4 \({\left[ {{\rm{KHF}}} \right]^{\rm{ + }}}\,\,{\rm{and}}\,\,{{\rm{F}}_{\rm{2}}}\)
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313608 The coupling between base units of DNA is through

1 Hydrogen bonding
2 Electrostatic bonding
3 Covalent bonding
4 Vander Waal’s forces
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313609 Assertion :
The nearly tetrahedral arrangement of the orbitals about the oxygen atom allows each water molecule to form hydrogen bonds with as many as four neighbouring water molecules.
Reason :
In ice, each molecule forms four hydrogen bonds as each molecule is fixed in the space.

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.
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313610 \(\mathrm{NH}_{3}\) has higher boiling point than expected because

1 it forms \(\mathrm{NH}_{4} \mathrm{OH}\) with water
2 it has strong intermolecular hydrogen bonds
3 it has intramolecular hydrogen bonds
4 its density decreases on freezing
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