Hydrogen Bonding

Q.

What is the name of the intermolecular forces existing between two non-polar molecules?

Q. PCl_xF_{5-x} molecule will be polar & non- polar for what values of x respectively? Polar Non-Polar (1) 2, 3, 5 (1)0, 4, 1 (2)0, 2, 5 (2)3, 1, 4 (3)4, 3, 0 (3)2, 0, 4 (4)2, 1, 4 (4)3, 0,

Q.

Which of the following has intermolecular hydrogen bonds?

1. HCOOH

2. CH₃OH

3. H₂

4. o-nitrophenol

Q. Versene is a chealting agent having chemical formula C2H4N2(C2H2O2aNa).If each mole of mole this compound could bind 1 mole of Ca+ 2 then the rating of pure versene exprresed as mg of CaCO3 bound per g of chelating agent

Q. Which of the following is planar molecule : (1)B2H6 (2)(BeCl2)n (3)(BeCl2)2 (4)Al2Cl6 Why not opt 2 here?

Q. H - B - H bond angle in $B{H}_4^{-}$ is:

1. 180°

2. 120°

3. 90°

4. 109°

Q. The nature of inter-molecular forces among benzene molecules is:

1. Dispersion forces
2. Hydrogen Bonding
3. Ion-dipole interaction
4. Dipole-dipole interaction

Q. The attractive forces between polar molecules are known as ________ forces and between non-polar molecules are known as ______ forces.

1. Dipole-dipole, London dispersion
2. Dipole-induced dipole, London dispersion
3. London dispersion, Dipole-dipole
4. Ion-dipole, Dipole-dipole

Q.

The pair of substances that have no hydrogen bonding is

1. CH₃COOH, NH₃

2. CH₃F, CH₄

3. C₆H₅NH₂, HF

4. CH₃OH , H₂O

Q. Which of the following has the highest bolling point?

1. $C{H}_4$
2. $C{F}_4$
3. $CC{l}_4$
4. $C_2{H}_2$

Q. Two ice cubes are pressed together until they form one block. Which of the following force is primarily responsible for holding the cubes together?

1. Dipole dipole interaction
2. Van der waals forces
3. Ionic interactions
4. Hydrogen bonding

Q. 42. If 1 g-atom of atomic nitrogen, 3g molecules of dinitrogen and 6 mole of ammonia aremixed in a vessel, then total number of nitrogen atoms present in the vessel is…

Q. Match the following substances with their intermolecular forces:

List-I	List-II
(i) $C{H}_4$	(p) Dispersion Force
(ii) $NC{l}_3$	(q) Hydrogen Bonding
(iii) $C_4{H}_{9}OH$	(r) Dipole-dipole

1. (i) - (p), (ii) - (q), (iii) - (r)
2. (i) - (q) , (ii) - (p) , (iii) - (r)
3. (i) - (p) , (ii) - (r), (iii) - (q)
4. (i) - (r) , (ii) - (q) , (iii) - (p)

Q. a) Which of the following species will have the largest and smallest size?
Mg, Mg²⁺, AI, AI^3+, Na, Na^+, Li, Li⁺
will na have largest and li+ have smallest size

Q. Maximum number of hydrogen bonds formed by a $H_{2}O$ molecule is _____

1. 4

2. 2

3. 1

4. 0

Q. Intermolecular hydrogen bonding is not present in which of the following pairs of molecules?

1. $Si{H}_4$ and $Si{F}_4$
2. 
3. 
4. All have intermolecular H-Bonding

Q.

Which of the following H-bonds is expected to have maximum strength?

1. H-O......H

2. H-N.......H

3. H-S.......H

4. All have same strength

Q. The intermolecular interaction that is dependent on the inverse cube of the distance between the molecules is :

1. london force
2. ion - ion interaction
3. ion - dipole interaction
4. hydrogen bond

Q.

The correct order of bond angles (smallest first) in $H_{2}S,N{H}_3,B{F}_3$ and $Si{H}_4$ is-

1. 

2. 

3. 

4. 

Q.

The pair of substances that have no hydrogen bonding is

1. $C{H}_{3}COOH,N{H}_3$
2. $C{H}_{3}F,C{H}_4$
3. $C_6{H}_{5}N{H}_2,HF$
4. $C{H}_{3}OH,H_{2}O$

Q.

Describe the structure of the common form of ice.

Q. Which of the following statements are correct?
(I) Both melting and boiling points of $H_{2}O$ are higher than those of $H_{2}Te$ .
(II) In both $N_2{O}_5$ and $N_2{O}_4$ all $N-O$ bond lengths are equivalent.
(III) In both crystalline $NaHC{O}_3$ and $KHC{O}_3.HC{O}_3^{-}$ forms only dimeric anion through hydrogen bond.
(IV) $B_2,C_2,N_2$ on further ionization (removal of single electron) form thermodynamically less stable species.

1. (I) and (II)
2. (III) and (IV)
3. (II) and (III)
4. (I) and (IV)

Q.

Define hydrogen bond. Is it weaker or stronger than the van der Waals forces?

Q. what is the meaning of naming a compound as derivative of alkyne??

Q. 78 Why doesnt nitrogen monoxide dimerise even though it is an odd electron molecule?

Q. Which of the following has the highest bolling point?

1. $C{H}_4$
2. $C{F}_4$
3. $CC{l}_4$
4. $C_2{H}_2$

Q.

When ice-cubes are pressed together, they fuse because of _____

1. Van der Waals forces

2. Covalent attraction

3. H - bonding

4. Dipole-dipole interaction

Q. Two ice cubes are pressed together until they form one block. Which of the following force is primarily responsible for holding the cubes together?

1. Dipole dipole interaction
2. Van der waals forces
3. Ionic interactions
4. Hydrogen bonding

Q. In which of the following cases M-F bond has partial double bond character where M is the central atom.

1. ${OF}_2$
2. All of these
3. ${PF}_3$
4. ${CCl}_{3}F$

Q. Which of the following statement is correct regarding dipole-dipole force?

1. The molecules should have hydrogen
2. The molecules should have carbon
3. Dipole-dipole force exists in every molecule
4. The molecules need to be very close to each other