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NEET Exam  >  NEET Tests  >  Chemistry Class 12  >  Assertion & Reason Test: The p-Block Elements - NEET MCQ

Assertion & Reason Test: The p-Block Elements - NEET MCQ


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15 Questions MCQ Test Chemistry Class 12 - Assertion & Reason Test: The p-Block Elements

Assertion & Reason Test: The p-Block Elements for NEET 2024 is part of Chemistry Class 12 preparation. The Assertion & Reason Test: The p-Block Elements questions and answers have been prepared according to the NEET exam syllabus.The Assertion & Reason Test: The p-Block Elements MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Assertion & Reason Test: The p-Block Elements below.
Solutions of Assertion & Reason Test: The p-Block Elements questions in English are available as part of our Chemistry Class 12 for NEET & Assertion & Reason Test: The p-Block Elements solutions in Hindi for Chemistry Class 12 course. Download more important topics, notes, lectures and mock test series for NEET Exam by signing up for free. Attempt Assertion & Reason Test: The p-Block Elements | 15 questions in 30 minutes | Mock test for NEET preparation | Free important questions MCQ to study Chemistry Class 12 for NEET Exam | Download free PDF with solutions
Assertion & Reason Test: The p-Block Elements - Question 1
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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.

Detailed Solution for Assertion & Reason Test: The p-Block Elements - Question 1

Due to high bond dissociation energy of triple bond between the two N atoms, nitrogen (N) is less reactive than P4 and its electron gain enthalpy is less than phosphorus.

Assertion & Reason Test: The p-Block Elements - Question 2
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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.

Detailed Solution for Assertion & Reason Test: The p-Block Elements - Question 2

Elements of group-15 form compounds in +5 oxidation state. Bismuth forms only one well characterised compound in +5 oxidation state which is BiF5. Due to inert pair effect bismuth exhibit +3 oxidation state and only forms trihalides. But due to small size and high electronegativity of fluorine, Bismuth forms BiF5.

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Assertion & Reason Test: The p-Block Elements - Question 3
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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.

Detailed Solution for Assertion & Reason Test: The p-Block Elements - Question 3

Sulphur (S) exists as S8 but oxygen forms pπ-pπ multiple bonds which is not present in S.

Assertion & Reason Test: The p-Block Elements - Question 4
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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.
Detailed Solution for Assertion & Reason Test: The p-Block Elements - Question 4

SF6 is sterically protected due to presence of six F atoms around S atom which prevents the attack of H2O on SF6.

Assertion & Reason Test: The p-Block Elements - Question 5
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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.
Detailed Solution for Assertion & Reason Test: The p-Block Elements - Question 5

Both statements are correct but are independent of each other. HI cannot be prepared by the reaction of KI with concentrated H2SO4 as it results in the formation of HI which further oxidizes to I2 as H2SO4 is a strong oxidizing agent.

Assertion & Reason Test: The p-Block Elements - Question 6
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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.
Detailed Solution for Assertion & Reason Test: The p-Block Elements - Question 6

F2 has higher bond dissociation enthalpy than Cl2.

Assertion & Reason Test: The p-Block Elements - Question 7
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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.
Detailed Solution for Assertion & Reason Test: The p-Block Elements - Question 7

Group 18 gases exhibit very high ionisation enthalpy because they have a stable electronic configuration.

Assertion & Reason Test: The p-Block Elements - Question 8
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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.
Detailed Solution for Assertion & Reason Test: The p-Block Elements - Question 8

Helium diffuses through most commonly used laboratory materials which is an unusual property of this gas.

Assertion & Reason Test: The p-Block Elements - Question 9
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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.
Detailed Solution for Assertion & Reason Test: The p-Block Elements - Question 9

HNO3 makes iron passive and its passivity is attained by formation of a thin film of oxide on iron.

Assertion & Reason Test: The p-Block Elements - Question 10
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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.
Detailed Solution for Assertion & Reason Test: The p-Block Elements - Question 10

Colourless fumes of hydrochloric acid (HCl) become greenish yellow because MnO2 oxidises HCl to chlorine gas.

Assertion & Reason Test: The p-Block Elements - Question 11
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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
Detailed Solution for Assertion & Reason Test: The p-Block Elements - Question 11

Colourless fumes of hydrochloric acid(HCl) because greenish yellow because MnO2 oxidises HCl to chlorine gas.

Assertion & Reason Test: The p-Block Elements - Question 12
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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.
Detailed Solution for Assertion & Reason Test: The p-Block Elements - Question 12

Due to small size and high electronegativity of oxygen, water is highly associated with intermolecular hydrogen bonding but molecules of H2S are held together by van der Waal’s forces of attraction. Hence, H2O is a liquid and H2S is a gas.

Assertion & Reason Test: The p-Block Elements - Question 13
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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.
Detailed Solution for Assertion & Reason Test: The p-Block Elements - Question 13

Fluorine is the best oxidising agent because it has more reduction potential (more ability to lose the electrons) which is attributed to its high electronegativity.

Assertion & Reason Test: The p-Block Elements - Question 14
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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 Δbond Ho.
Detailed Solution for Assertion & Reason Test: The p-Block Elements - Question 14

Fluorine is the maximum reactive because of low bond dissociation enthalpy.

Assertion & Reason Test: The p-Block Elements - Question 15
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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.
Detailed Solution for Assertion & Reason Test: The p-Block Elements - Question 15

The noble gases are inactive as they have a closed shell structure.

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