Anomalous Behaviour of Fluorine

Q. Acidity increases in the order

1. H-F > H-Cl > H-Br > H-I
2. H-F > H-Cl < H-Br > H-I
3. H-F < H-Cl < H-Br < H-I
4. H-F > H-Cl > H-Br < H-I

Q. Stability decreases in the order

1. H-Cl > H-F > H-Br > H-I
2. H-F > H-Cl > H-Br > H-I
3. H-F > H-Br > H-Cl > H-I
4. H-F > H-Cl > H-I > H-Br

Q. Fluoride can form polyfluorides $F_3^{-}$ - True or False?

1. True
2. False

Q. Fluorine does not have d-orbitals in its valence shell - True or False?

1. True
2. False

Q. The variation of the boiling points of the hydrogen halides is in the order $HF>HI>HBr>HCl$
What explains the higher boiling point of hydrogen fluoride?

1. There is strong hydrogen bonding between HF molecules.
2. The bond energy of HF molecules is greater than in other hydrogen halides.
3. The effect of nuclear shielding is much reduced in fluorine which polarises the HF molecule.
4. The electronegativity of fluorine is much higher than for other elements in the group.

Q.

Choose the correct statements:

1. Fluorine is a super halogen

2. Iodine shows Lewis basic character

3. $AgF$ is insoluble in water

4. $SC{N}^{-}$ is a pseudohalide

Q.

Apart from carbon, the popular non-stick polymer coating Teflon contains:

1. Fluorine

2. Chlorine

3. Bromine

4. Iodine

Q. Mark the incorrect statement(s):

1. The bond dissociation enthalpy of $F_2$ is greater than that of $C{l}_2$
2. The boiling point of $HX$ (where $X$ is a halogen) increases uniformly down the group
3. The solubility of iodine in water increases greatly in the presence of $I^{-}$ ion
4. $N_3^{–}$ is a pseudo halide

Q. Which of the following cannot be hydrolysed?

1. $O{F}_2$
2. $SiC{l}_4$
3. $NC{l}_3$
4. $S{F}_4$

Q. Choose correct squence for the following species.

1. $F_2>C{l}_2>B{r}_2>I_2$(Reducing power)
2. $C{l}_2<F_2<B{r}_2<I_2$ (Reactivity)
3. $C{l}_2>B{r}_2>F_2>I_2$ (Bond dissociation enthalpy)
4. $I_2>B{r}_2>F_2>C{l}_2$(Bond length)