Problem 143
Which of the following does not change as a consequence of hydrogen bonding in a compound? (1) colour (2) boiling point (3) density (4) freezing point
Problem 144
The hydrogen bonding in oxygen compounds is more significant than that in sulphur compounds because oxygen is (1) a very small atom compared to the sulphur atom (2) more electroncgative than sulphur (3) more reactive than sulphur (4) a gas where as sulphur is a solid at room temperature
Problem 148
The melting point of 2 -nitrophenol is lower than that of 4 -nitrophenol and this is because of (1) Intramolecularhydrogen bondingin 2-nitrophenol (2) Intramolecular hydrogen bonding in 4 -nitrophenol (3) Intermolecular hydrogen bonding in 2 -nitrophenol (4) Hydrogen bonding has no relation to the melting point,
Problem 150
The relative strength of the hydrogen bond between the molecules in liquid hydrogen halides can be best ascertained by a comparison of their (1) bond dissociation energies (2) enthalpy changes of vapourisation (3) freezing points (4) enthalpy changes of formation
Problem 151
Although nitrogen and chlorine have the same electroncgativity, nitrogen atoms form stronger hydrogen bonds than chlorine atoms. This is due to (1) the basic character of nitrogen (2) the smaller size of nitrogen (3) the lesset number of electrons in the nitrogen atom (4) the inertness of nitrogen atom
Problem 152
Hydrogen bonding is exhibited by (1) all the molecules containing H-atom (2) molecules in which tuo H-atoms are present (3) molecules in which H-atom is covalently bonded to \(\mathrm{F}, \mathrm{O}, \mathrm{N}\) (4) molecules in which \(\mathrm{H}\) -atom is bonded to atoms with electronegativity more than \(2.1\)
Problem 154
4o-nitrophenol is stcam volatile, whercas \(\mathrm{p}\) -nitrophenol is not. This is due to (1) intramolecular hydrogen bonding present in orthonitrophenol (2) intermolecular hydrogen bonding present in orthonitrophenol (3) intermolecular hydrogen bonding present in paranitrophenol (4) nonc of these
Problem 156
Hydrogen bonds are formed between moleculcs in which hydrogen is covalently bonded to an clcment whose atomic radius and electroncgativity respectively are (1) large and low (2) large and high (3) small and high (4) small and low
Problem 157
Pick out the property which is not relevant, In a molecule, hydrogen bond results in (1) molecule association (2) abnormal boiling points (3) high solubility value (4) high Van der Waal's forces
Problem 158
Which of the following statement is wrong? (1) Bond length decreases with increase in \(\mathrm{p}\) -character, (2) Bond energy of \(\mathrm{HF}\) is the highest among hydrogen halides. (3) Bond energy decreases with increase in the lone pair electrons on bonded atoms. (4) Bond energy of a covalent bond increases with increase in the difference of electronegativities of bonded atoms.
