p-Block Elements (Group 15–18)

Identify the incorrect statement from the following:

1. Phosphorus, arsenic and antimony show catenation property.
2. P(C2H5)3 and As(C6H5)3 form dπ–dπ bond with transition metals.
3. Nitrogen can form dπ–pπ bond with oxygen.
4. Nitrogen can form pπ–pπ multiple bonds with itself.

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

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

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

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

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

Among Group 16 elements, which one does NOT show -2 oxidation state?

1. O
2. Se
3. Te
4. Po

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.

Identify the incorrect statement.

1. PEt3 and AsPh3 as ligands can form d - d bond with transition metals
2. The N - N single bond is as strong as the P - P single bond
3. Nitrogen has unique ability to form p - p multiple bonds with nitrogen, carbon and oxygen
4. Nitrogen cannot form d - p bond as other heavier elements of its group

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 correct answer from the options given below:

1. Both A and R are true but R is NOT the correct explanation of A.
2. A is true but R is false.
3. A is false but R is true.
4. Both A and R are true and R is the correct explanation of A.

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.

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

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

Which of the following reactions is a part of the large scale industrial preparation of nitric acid?

1. Cu(NO3)2 + 2NO2 + 2H2O [500 K, 9 bar]Pt 4HNO3 + Cu
2. NaNO3 + H2SO4 [500 K, 9 bar]Pt NaHSO4 + HNO3
3. 4NH3 + 5O2 (from air) [500 K, 9 bar]Pt 4NO + 6H2O
4. 4HPO3 + 2N2O5 [500 K, 9 bar]Pt 4HNO3 + P4O10

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.

Noble gases are named because of their inertness towards reactivity. Identify an incorrect statement about them.

1. Noble gases have large positive values of electron gain enthalpy
2. Noble gases are sparingly soluble in water
3. Noble gases have very high melting and boiling points
4. Noble gases have weak dispersion forces

In which one of the following arrangements the given sequence is not strictly according to the properties indicated against it?

1. CO2 < SiO2 < SnO2 < PbO2 : Increasing oxidizing order
2. HF < HCl < HBr < HI : Increasing acidic strength
3. H2O < H2S < H2Se < H2Te : Increasing pKa values
4. NH3 < PH3 < AsH3 < SbH3 : Increasing acidic character

Urea reacts with water to form A which will decompose to form B. B when passed through Cu2+(aq), deep blue colour solution C is formed. What is the formula of C from the following?

1. [Cu(NH3)4]2+
2. Cu(OH)2
3. CuCO3 Cu(OH)2
4. CuSO4

Which of the following oxoacid of sulphur has -O-O- linkage?

1. H2SO4, sulphuric acid
2. H2S2O8, peroxodisulphuric acid
3. H2S2O7, pyrosulphuric acid
4. H2SO3, sulphurous acid

The correct structure of tribromooctaoxide is :

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

Which is the correct thermal stability order for H2E (E = O, S, Se, Te and Po)?

1. H2Po < H2Te < H2Se < H2S < H2O
2. H2Se < H2Te < H2Po < H2O < H2S
3. H2S < H2O < H2Se < H2Te < H2Po
4. H2O < H2S < H2Se < H2Te < H2Po

Identify the incorrect statement related to PCl5 from the following :

1. Axial P–Cl bonds are longer than equatorial P–Cl bonds
2. PCl5 molecule is non-reactive
3. Three equatorial P–Cl bonds make an angle of 120° with each other
4. Two axial P–Cl bonds make an angle of 180° with each other

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.

In which pair of ions both the species contain S-S bond?

1. S4O62-, S2O32-
2. S2O72-, S2O82-
3. S4O62-, S2O72-
4. S2O72-, S2O32-

Name the gas that can readily decolourise acidified KMnO4 solution.

1. SO2
2. NO2
3. P2O5
4. CO2

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 is the correct statement for the given acids?

1. Phosphinic acid is a monoprotic acid while phosphonic acid is a diprotic acid.
2. Phosphinic acid is a diprotic acid while phosphonic acid is a monoprotic acid.
3. Both are diprotic acids.
4. Both are triprotic acids.

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

When copper is heated with conc. HNO3 it produces

1. Cu(NO3)2, NO and NO2
2. Cu(NO3)2 and N2O
3. Cu(NO3)2 and NO2
4. Cu(NO3)2 and NO

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

Hot concentrated sulphuric acid is a moderately strong oxidizing agent. Which of the following reactions does not show oxidizing behaviour?

1. Cu + 2H2SO4 CuSO4 + SO2 + 2H2O
2. 3S + 2H2SO4 3SO2 + 2H2O
3. C + 2H2SO4 CO2 + 2SO2 + 2H2O
4. CaF2 + H2SO4 CaSO4 + 2HF

Strong reducing behavior of H3PO2 is due to

1. high electron gain enthalpy of phosphorus
2. high oxidation state of phosphorus
3. presence of two -OH groups and one P-H bond
4. presence of one -OH group and two P-H bonds.