p-Block Element...

Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): N₂ is less reactive than P₄. 
Reason (R): Nitrogen has more electron gain enthalpy than phosphorus.

Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): Bismuth forms only one well characterised compound in +5 oxidation state.
Reason (R): Elements of group-15 form compounds in +5 oxidation state.

Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): Both rhombic and monoclinic sulphur exist as S8 but oxygen exists as O₂.
Reason (R): Oxygen forms pp-pp multiple bond due to small size and small bond length but pπ-pπ bonding is not possible in sulphur.

Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): SF₆ cannot be hydrolysed but SF₄ can be.
Reason (R): Six atoms in SF₆ prevent the attack of H₂O on sulphur atom of SF₆.

Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): HI cannot be prepared by the reaction of KI with concentrated H₂SO₄.
Reason (R): HI has lowest H–X bond strength among halogen acids.

Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): F₂ has lower bond dissociation energy than Cl₂.
Reason (R): Fluorine is more electronegative than chlorine.

Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion(A): Group 18 gases exhibit very high ionisation enthalpy.
Reason (R): They have a stable electronic configuration.

Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion(A): Helium diffuses through most commonly used laboratory materials.
Reason(R): This gas has a very low melting  point.

Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): HNO₃ makes iron passive.
Reason (R): HNO₃ forms a protective layer of ferric nitrate on the surface of iron.

Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): NaCl reacts with concentrated H2SO4 to give colourless fumes with pungent smell. But on adding MnO2 the fumes become greenish yellow. 
Reason (R): MnO2 oxidises HCl to chlorine gas which is greenish yellow.

Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): NaCl reacts with concentrated H₂SO₄ to give colourless fumes with pungent smell. But on adding MnO₂ the fumes become greenish yellow.
Reason (R): MnO₂ oxidises HCl to chlorine gas which is greenish yellow

Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): H₂O a liquid and H₂S a gas.
Reason (R): Water molecules are held by H-bonds while in H₂S molecules no such interactions are present between molecules.

Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): F₂ is a strong oxidizing agent.
Reason (R): Electron gain enthalpy of fluorine is less negative.

Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): F₂ has lower reactivity.
Reason (R): F-F bond has low Δ_bond H^o.

Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion(A): The noble gases are inactive.
Reason(R): These gases have a closed shell  structure.