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#General Chemistry

10 public questions tagged with this topic.

CHEMISTRY

How many grams of H₂ are produced from 54 g of Al in the reaction 2Al + 6HCl -> 2AlCl₃ + 3H₂ ? (Atomic masses: Al

Given: How many grams of H₂ are produced from 54 g of Al in the reaction 2Al + 6HCl -> 2AlCl₃ + 3H₂ ? (Atomic masses: Al = 27, H = 1) These values define the system as per NCERT data. Formula: Moles of Al = 54 / 27 = 2 mol. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: 2 mol Al produce 3 mol H₂. Molar mass of H₂ = 2 g/mol. Mass = 3 × 2 = 6 g. Result: The computed value matches the expected outcome and confirms the correct choice. Units and powers like J kg⁻¹ K⁻¹, m/s², 10⁻⁵ are properly used as per NCERT.

Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Some Basic Concepts, Structure of Atom and Periodicity, Topic: Mole concept, atomic models and periodic trends.

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CHEMISTRY

Which of the following compounds is least soluble in water?

The solubility of alcohols in water decreases as the size of the alkyl group increases due to increased hydrophobic interactions. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Relevant Chemistry topic covering principles and examples as per NCERT.

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CHEMISTRY

Which molecule has a covalent bond formed by sharing four electrons between two atoms?

In Oâ‚‚, two oxygen atoms share two pairs of electrons (4 electrons), forming a double covalent bond. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Some Basic Concepts, Structure of Atom and Periodicity, Topic: Mole concept, atomic models and periodic trends.

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CHEMISTRY

Which of the following molecules has a bond order of 1 according to molecular orbital theory?

Given: Which of the following molecules has a bond order of 1 according to molecular orbital theory? These values define the system as per NCERT data. Formula: Bond order = 1/2 (10 - 8) = 1 .. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: For F₂ : (sigma 1s)² (sigma^* 1s)² (sigma 2s)² (sigma^* 2s)² (sigma 2p_z)² (π 2p_x)² (π 2p_y)² (π^* 2p_x)² (π^* 2p_y)² . Result: The computed value matches the expected outcome and confirms the correct choice. Units and powers like J kg⁻¹ K⁻¹, m/s², 10⁻⁵ are properly used as per N

Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Some Basic Concepts, Structure of Atom and Periodicity, Topic: Mole concept, atomic models and periodic trends.

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CHEMISTRY

Which of the following has the shortest bond length?

Bond length decreases with increasing bond order. Nâ‚‚ (triple bond, 109 pm) is shorter than Oâ‚‚ (121 pm), Fâ‚‚ (144 pm), or Clâ‚‚ (199 pm). This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Relevant Chemistry topic covering principles and examples as per NCERT.

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CHEMISTRY

Which molecule has a bond order of 3 according to the Lewis structure?

In Nâ‚‚, nitrogen atoms share 3 electron pairs, giving a bond order of 3 (triple bond). This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Some Basic Concepts, Structure of Atom and Periodicity, Topic: Mole concept, atomic models and periodic trends.

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CHEMISTRY

The oxide of which element is neutral?

Nitrogen (N) forms N_2O, a neutral oxide, which does not react significantly with water to form acids or bases. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Chemistry Textbook - Latest Edition for Academic Session 2026-27 (Rationalized Textbook for Class XI and XII), Chapter: Chemical Bonding (Latest NCERT 2026-27), Topic: Hybridization of nitrogen in CH₃NH₂, sp³ hybridization and pyramidal geometry

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