Explanation

• Silicon carbide (SiC), also known as carborundum, is a giant covalent network solid.
• Silicon and carbon atoms are connected by strong covalent bonds in a three-dimensional structure.
• It is extremely hard and has a high melting point.

Last verified on 30-10-2026

Explanation

• The rate of an SN2 reaction depends on the concentrations of both the substrate and the nucleophile.
• It is a bimolecular reaction involving both species in the rate-determining step.
• Rate law: Rate = k[Substrate][Nucleophile].

Last verified on 30-10-2026

Explanation

• In F₂, the sigma bond is formed by the head-on overlap of two half-filled 2p orbitals.

Additional information:

• In H₂, the sigma bond forms through 1s–1s overlap.
• In HF and HCl, the sigma bonds form through overlap of hydrogen's 1s orbital with a p orbital of the halogen.

Last verified on 30-10-2026

Explanation

• Caproic acid is the common name for hexanoic acid.
• It contains six carbon atoms, including the carbon atom of the carboxyl group (–COOH).
• Its molecular formula is C₆H₁₂O₂, also written as C₅H₁₁COOH.

Last verified on 30-10-2026

Explanation

Applying the formula $0.70 - 0.85$ results in a negative discrimination index of $-0.15$.

Additional Information:

Negative Discrimination: Occurs when lower-performing students answer an item correctly more often than high performers, suggesting a flawed question.

Item Review: Prompts test editors to investigate potential ambiguity or keying errors in the question.

Updated on 30-10-2026 by Muqadas

Explanation

Dividing correct responses by total responses yields the difficulty proportion ($75 / 100 = 0.75$).

Additional Information:

Difficulty Index Calculation: Ranges from 0.0 to 1.0, where higher figures denote easier test questions.

Item Analysis: Core metric for optimizing test difficulty and discriminating power in assessments.

Updated on 30-10-2026 by Muqadas

Explanation

• The principal quantum number (n) indicates the main energy level. For a 6p orbital, n = 6.
• The azimuthal quantum number (l) identifies the subshell: s = 0, p = 1, d = 2, and f = 3.
• Therefore, a 6p orbital has n = 6 and l = 1.

Last verified on 30-10-2026

Explanation

• A geminal dihalide has two halogen atoms attached to the same carbon atom.
• In CH₂=C(Cl)₂, both chlorine atoms are attached to the same carbon atom.

Additional information:

• A vicinal dihalide has two halogen atoms attached to adjacent carbon atoms.

Last verified on 30-10-2026

Explanation

Providing structured response time and equitable calling ensures that all students engage actively in class discussions.

Additional Information:

Equitable Engagement: Breaks patterns of dominance by high-confidence learners through systematic participation strategies.

Response Distribution: Encourages broader cognitive involvement across the entire student body.

Updated on 30-10-2026 by Muqadas

Explanation

• Metamerism occurs when compounds have the same molecular formula and functional group but different alkyl groups on either side of the functional group.
• The carbon atoms are distributed differently on the two sides of the functional group.
• Example: Ethoxyethane (C₂H₅–O–C₂H₅) and methoxypropane (CH₃–O–C₃H₇).

Last verified on 30-10-2026