pBlock -12th sc 3rd semester

Instructions: For each question, two statements are given: Assertion (A) and Reason (R). Choose the correct option:

- A: Both A and R are true, and R is the correct explanation of A.

- B: Both A and R are false, but R is not the correct explanation of A.

- C: A is true, but R is false.

- D: A is false, but R is true

Assertion (A): Nitrogen gas (N₂) is chemically inert at room temperature.  

   Reason (R): The N≡N triple bond has a low bond dissociation energy.  

• A

• B

• C

• D

A: Both A and R are true, and R is the correct explanation of A.

- B: Both A and R are false, but R is not the correct explanation of A.

- C: A is  true, but R is false.

- D: A is false, but R is true

 Assertion (A): Oxygen is diamagnetic in its molecular form (O₂).  

   Reason (R): O₂ has two unpaired electrons in its molecular orbital configuration. 

• A

• B

• C

• D

A: Both A and R are true, and R is the correct explanation of A.

- B: Both A and R are false, but R is not the correct explanation of A.

- C: A is  true, but R is false.

- D: A is false, but R is true

Assertion (A): Fluorine is the most electronegative element in the periodic table.  

   Reason (R): Fluorine has a small atomic radius and high Electron affinity. 

• A

• B

• C

• D

Select the correct information of given picture

• Distorted octahedral structure, L.P=1, B.P=6, Sigma bond=6, Pi bond=0

• octahedral structure, L.P=0, B.P=6, Sigma bond=6, Pi bond=0

• Distorted octahedral structure, L.P=0, B.P=6, Sigma bond=6, Pi bond=0

• octahedral structure, L.P=1, B.P=6, Sigma bond=6, Pi bond=1

A: Both A and R are true, and R is the correct explanation of A.

- B: Both A and R are false, but R is not the correct explanation of A.

- C: A is  true, but R is false.

- D: A is false, but R is true.

 Assertion (A): Phosphorus exists as P₄ molecules in its white form.  

   Reason (R): White phosphorus is highly reactive due to its octahedral structure with strained bonds. 

• A

• B

• C

• D

Statement-1-Nitrogen can form five covalent bonds in some compounds due to its ability to use d-orbitals.

Statement-2- The structure of NH3 is tetrahedral

• Both statements are false

• Both statements are true

• Statement-1- is true but Statement-2- is false

• Statement-1- is False but Statement-2- is true

Complete the reaction.....

• XeO3 + 2HF

• XeO3 + HF

• XeO2 + 2HF

• XeO4 + 2HF

Which among the following is arranged correctly (Acidic Character)......

• H2O<H2S<H2Se<H2Te

• H2O>H2S>H2Se>H2Te

• H2O>H2Se>H2S>H2Te

• H2O<H2S<H2Te<H2Se

The formula of Marshall`s acid is...

• H2S2O8

• H2S2O7

• H2SO8

• H2S2O6

| Column A | Column B |

|--------------|--------------|

| A. NH₃      | 1. Linear |

| B. SF₆      | 2. Trigonal pyramidal |

| C. XeF₂     | 3. Octahedral |

| D. SO₂      | 4. Bent |

| E. PCl₅     | 5. Trigonal bipyramidal |

•  A - 2  

  B - 3  

  C - 1  

  D - 4  

  E - 5

• A - 3 

  B - 2 

  C - 1  

  D - 4  

  E - 5

• A - 2  

  B - 3  

  C - 1  

  D - 5 

  E - 4

• A - 2  

  B - 1 

  C - 3  

  D - 4  

  E - 5