The maximum number of electrons that can be accommodated in the N shell is: MCQ with Answer and Explanation

The maximum number of electrons that can be accommodated in the N shell is:
A. 8
B. 32
C. 18
D. 50
Answer: Option B
Solution (By JKSSB Mock Tests)
The maximum number of electrons in a shell is given by the formula 2n², where n is the principal quantum number. For the N shell, n = 4. Thus, maximum electrons = 2(4)² = 2(16) = 32. The K, L, M, and N shells hold 2, 8, 18, and 32 electrons respectively.

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Practice More chemistry Questions

Question #1
Which of the following is a Lewis acid?
A. H2O
B. OH-
C. NH3
D. BF3

Correct Answer: Option D


Explanation:
A Lewis acid is a chemical species that can accept a pair of electrons to form a covalent bond. BF3 has an incomplete octet on the boron atom (only 6 electrons), making it an electron-deficient molecule and a strong Lewis acid. NH3, H2O, and OH- have lone pairs and act as Lewis bases.

This question belongs to: Science chemistry
Question #2
In an electrolytic cell, the anode is connected to the:
A. Negative terminal of the battery
B. Cathode of another cell
C. Ground
D. Positive terminal of the battery

Correct Answer: Option D


Explanation:
In electrolysis, the external power source forces non-spontaneous reactions. Electrons are drawn away from the anode, making it positive. Thus anode is connected to the positive terminal. In a galvanic (voltaic) cell, anode is negative. Remember: electrolytic cell – anode positive; oxidation still occurs at anode. Electroplating uses this setup: object to be plated is cathode, source metal is anode.

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Question #3
Assertion (A): Covalent compounds generally have low melting points. Reason (R): The intermolecular forces in covalent compounds are weak compared to ionic compounds.
A. A is true but R is false.
B. Both A and R are true but R is NOT the correct explanation of A.
C. Both A and R are true and R is the correct explanation of A.
D. A is false but R is true.

Correct Answer: Option C


Explanation:
Covalent compounds consist of molecules held together by weak van der Waals forces, unlike the strong electrostatic forces in ionic lattices. Therefore, less heat energy is required to break these intermolecular forces, resulting in low melting and boiling points. Both statements are true and R correctly explains A.

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