Home
Class 12
CHEMISTRY
In the following questions a statement o...

In the following questions a statement of assertion (A) is followed by a statement of reason ( R)
A : Electron affinity of oxygen is higher than suiphur.
R : Number of valence orbitals containing electrons are different.

A

If Both Assertion & Reason are true and the reason is the correct explanation of the assertion then mark (1) .

B

If both Assertion & Reason are true but the reason is not the correct explanation of the assertion then mark (2)

C

If Assertion is true statement but Reason is false then mark (3)

D

If both Assertion and Reason are false statements then mark (4)

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze the assertion (A) and the reason (R) provided: **Assertion (A)**: Electron affinity of oxygen is higher than sulfur. **Reason (R)**: Number of valence orbitals containing electrons are different. ### Step-by-Step Solution: 1. **Understanding Electron Affinity**: - Electron affinity refers to the amount of energy released when an electron is added to a neutral atom in the gas phase. Generally, elements with higher electronegativity and smaller atomic size have higher electron affinity. 2. **Comparing Oxygen and Sulfur**: - Oxygen (O) has an atomic number of 8, and its electron configuration is 1s² 2s² 2p⁴. - Sulfur (S) has an atomic number of 16, and its electron configuration is 1s² 2s² 2p⁶ 3s² 3p⁴. - Although both have the same number of valence electrons (6), the electron affinity of oxygen is actually lower than that of sulfur due to the increased electron-electron repulsion in the smaller oxygen atom. 3. **Evaluating Assertion (A)**: - The assertion states that the electron affinity of oxygen is higher than that of sulfur. This is **false** because, in reality, sulfur has a higher electron affinity than oxygen. 4. **Evaluating Reason (R)**: - The reason states that the number of valence orbitals containing electrons are different. Both oxygen and sulfur have the same number of valence electrons (6), and thus the number of valence orbitals is also similar. This statement is also **false**. 5. **Conclusion**: - Since both the assertion and the reason are false, the correct answer is option 4: "Both assertion and reason are false." ### Final Answer: **Option 4**: Both assertion and reason are false. ---
Promotional Banner

Similar Questions

Explore conceptually related problems

In the following questions , a statement of assertion (A) is followed by a statement of reason (R). A: For 3dz^2 orbital, I = 0, 1 and 2. R: Number of angular nodes for 3dz^2 orbital is two.

In the following questions, a statement of assertion (A) is followed by a statement of reason (R ) A : O_(2) is paramagnetic . R : N_(2) is paramagnetic .

In the following questions, a statement of assertion (A) is followed by a statement of reason (R ) A : PCl_(5) exist but NCl_(5) does not R : Nitrogen is highly inert.

In the following questions a statement of assertion (A) is followed by a statement of reason ( R) A : Lanthanum ( Z: 57) is lanthanoid . R : Valence electrons are present in 4 f orbital.

In the following questions a statement of assertion (A) is followed by a statement of reason ( R) A : F is most electronegative element of periodic table. R : CI is having highest electron affinity.

In the following questions, a statement of assertion (A) is followed by a statement of reason (R ) A : LiCl is more covalent than BeCl_(2) R : Li^(*) ion is smaller than Be^(2+) .

In the following questions a statement of assertion (A) is followed by a statement of reason ( R) A : Cu, Ag, Au are known as coinage metal. R: Coinage metals are d-block metals .

In the following questions, a statement of assertion (A) is followed by a statement of reason (R ) A : Both methane and tetrachloromethane are nonpolar. R : C-Cl bond is polar bond.

In the following questions, a statement of assertion (A) is followed by a statement of reason (R ) A : H-F forms stronger hydrogen bond than H_(2)O . R : F is more electronegative than oxygen.

In the following questions, a statement of assertion (A) is followed by a statement of reason (R ) A : Lattice energy of CaO is higher than LiCl. R : Lattice energy of ionic compound is directly prportional to the product of charges of ion.