p-Block Elements (Group 15–18)

Given below are two statements : In light of the above statements, choose the most appropriate answer from the options given below.

1. Statement I is incorrect but Statement II is correct
2. Both Statement I and Statement II are correct
3. Both Statement I and Statement II are incorrect
4. Statement I is correct but Statement II is incorrect

Identify the incorrect statement from the following :

1. The acidic strength of HX (X = F, Cl, Br and I) follows the order: HF > HCl > HBr > HI.
2. Fluorine exhibits -1 oxidation state whereas other halogens exhibit +1, +3, +5 and +7 oxidation states also.
3. The enthalpy of dissociation of F2 is smaller than that of Cl2.
4. Fluorine is stronger oxidising agent than chlorine.

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R) In the light of the above statements, choose the most appropriate answer from the options given below:

1. Both (A) and (R) are correct and (R) is the correct explanation of (A).
2. Both (A) and (R) are correct but (R) is not the correct explanation of (A).
3. (A) is correct but (R) is not correct.
4. (A) is not correct but (R) is correct.

Fluorine is a stronger oxidising agent than chlorine because : Choose the most appropriate answer from the options given :

1. B and C only
2. A and B only
3. A and C only
4. A and D only

In the light of the above statements, choose the correct answer from the options given below.

1. Statement I is incorrect but Statement II is true.
2. Both Statement I and Statement II are true.
3. Both Statement I and Statement II are false.
4. Statement I is correct but Statement II is false.

The correct structure of tribromooctaoxide is :

1. [figure]
2. [figure]
3. [figure]
4. [figure]

Which of the following statements is not true for halogens?

1. All are oxidizing agents.
2. All form monobasic oxyacids.
3. All but fluorine show positive oxidation states.
4. Chlorine has the highest electron-gain enthalpy.

HgCl2 and I2 both when dissolved in water containing I- ions, the pair of species formed is

1. HgI2, I-
2. HgI42-, I3-
3. Hg2I2, I-
4. HgI2, I3-

Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?

1. Br2 > I2 > F2 > Cl2
2. F2 > Cl2 > Br2 > I2
3. I2 > Br2 > Cl2 > F2
4. Cl2 > Br2 > F2 > I2

Among the following the correct order of acidity is

1. HClO2 < HClO < HClO3 < HClO4
2. HClO4 < HClO2 < HClO < HClO3
3. HClO3 < HClO4 < HClO2 < HClO
4. HClO < HClO2 < HClO3 < HClO4

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.

Which is the strongest acid in the following?

1. HClO4
2. H2SO3
3. H2SO4
4. HClO3

Among the following which is the strongest oxidising agent?

1. Br2
2. I2
3. Cl2
4. F2

Which one of the following orders correctly represents the increasing acid strengths of the given acids?

1. HOClO < HOCl < HOClO3 < HOClO2
2. HOClO2 < HOClO3 < HOClO < HOCl
3. HOClO3 < HOClO2 < HOClO < HOCl
4. HOCl < HOClO < HOClO2 < HOClO3

Which one of the following orders is not in accordance with the property stated against it ?

1. F2 > Cl2 > Br2 > I2 : Bond dissociation energy
2. F2 > Cl2 > Br2 > I2 : Oxidising power
3. HI > HBr > HCl > HF : Acidic property in water
4. F2 > Cl2 > Br2 > I2 : Electronegativity

Which one of the following orders is not in accordance with the property stated against it?

1. F2 > Cl2 > Br2 > I2 : Bond dissociation energy
2. F2 > Cl2 > Br2 > I2 : Oxidising power
3. HI > HBr > HCl > HF : Acidic property in water
4. F2 > Cl2 > Br2 > I2 : Electronegativity.

Which one of the following oxides is expected to exhibit paramagnetic behaviour?

1. CO2
2. SiO2
3. SO2
4. ClO2

Which one of the following orders correctly represents the increasing acid strengths of the given acids?

1. HOClO < HOCl < HOClO3 < HOClO2
2. HOClO3 < HOClO2 < HOClO < HOCl
3. HOClO2 < HOClO3 < HOClO < HOCl
4. HOCl < HOClO < HOClO2 < HOClO3

Which one of the following statements is not true?

1. Among halide ions, iodide is the most powerful reducing agent.
2. Fluorine is the only halogen that does not show a variable oxidation state.
3. HOCl is a stronger acid than HOBr.
4. HF is a stronger acid than HCl.

Which of the following statement is true?

1. Silicon exhibits 4 coordination number in its compounds
2. Bond energy of F2 is less than Cl2
3. Mn(III) oxidation state is more stable than Mn(II) in aqueous state
4. Elements of 15th group show only +3 and +5 oxidation states

Which statement is wrong ?

1. Bond energy of F2 > Cl2
2. Electronegativity of F > Cl
3. F is more oxidising than Cl
4. Electron affinity of Cl > F