Rohan Ahmed
![What is Stereoisomerism? [1 Mark Q&A] – qChem+ chemistry featured image explaining stereoisomerism, compounds with the same molecular formula and connectivity but different three-dimensional arrangements, including geometrical, optical, and conformational isomerism for HSC, SSC, O Level, AS Level, and A Level Chemistry students.](https://qchemplus.com/wp-content/uploads/2026/09/What-is-Stereoisomerism-1-mark-QA-820x430.webp "What is Stereoisomerism – 1 mark Q&A")
- Sep 15, 2026
Learn What is Stereoisomerism? with this concise 1 Mark Q&A by qChem+. Understand compounds with the same molecular formula and...
![A detailed educational infographic titled "What is Mole Fraction?" for qChem+, defining it as the ratio of moles of a component to the total moles in a mixture, with a beaker illustration and formulas for components A, B, and C. It features the qChem+ logo from The Quality Corporates Bangladesh Ltd. and a "[1 Mark Q&A]" call-out.](https://qchemplus.com/wp-content/uploads/2026/09/What-is-Mole-Fraction-1-mark-QA-820x430.webp "What is Mole Fraction – 1 mark Q&A")
- Sep 15, 2026
Learn exactly what is mole fraction in this 1 Mark Q&A from qChem+. We break down the definition, formula, and...
![What is Partial Pressure? [1 Mark Q&A] – qChem+ chemistry featured image illustrating partial pressure in a gas mixture, showing individual gas pressures and Dalton’s law of partial pressures for HSC, SSC, O Level, AS Level, and A Level Chemistry students.](https://qchemplus.com/wp-content/uploads/2026/06/What-is-Partial-Pressure-1-mark-QA-820x430.webp "What is Partial Pressure? | 1 Mark Q&A for Chemistry Students – qChem+")
- Jun 30, 2026
Learn what is partial pressure with this concise 1 Mark Q&A by qChem+. Understand Dalton’s Law of Partial Pressures and...
![What is Enantiomer? [1 Mark Q&A] – qChem+ chemistry featured image illustrating enantiomers as non-superimposable mirror images with chiral molecules, stereochemistry concept, and optical isomerism for HSC, SSC, O Level, AS Level, and A Level Chemistry students.](https://qchemplus.com/wp-content/uploads/2026/06/What-is-Enantiomer-1-Mark-QA-–-qChem-The-Home-of-Chemistry-1-820x430.webp "What is Enantiomer [1 Mark Q&A] – qChem+ – The Home of Chemistry")
- Jun 28, 2026
Learn what is enantiomer is with this concise 1 Mark Q&A by qChem+. Understand non-superimposable mirror images, chirality, and stereochemistry...
![What is Standard Enthalpy Change of Formation? [1 Mark Q&A] – qChem+ chemistry featured image explaining standard enthalpy change of formation (ΔH°f), showing the formation of one mole of a compound from its elements in their standard states for HSC, SSC, O Level, AS Level, and A Level Chemistry students.](https://qchemplus.com/wp-content/uploads/2026/06/What-is-Standard-Enthalpy-Change-of-Formation-1-Mark-QA-–-qChem-The-Home-of-Chemistry-820x430.webp "What is Standard Enthalpy Change of Formation [1 Mark Q&A] – qChem+ – The Home of Chemistry")
- Jun 28, 2026
Learn what is Standard Enthalpy Change of Formation (ΔH°f) with this concise 1 Mark Q&A by qChem+. Understand how one...
![What is Le Chatelier’s Principle? [1 Mark Q&A] – qChem+ The Home of Chemistry chemistry featured image illustrating chemical equilibrium, stress and shift, and reaction conditions like temperature, pressure, concentration, and catalyst for HSC, SSC, O Level, AS Level, and A Level students.](https://qchemplus.com/wp-content/uploads/2026/06/What-is-Le-Chateliers-Principle-1-Mark-QA-–-qChem-The-Home-of-Chemistry-820x430.webp "What is Le Chatelier’s Principle [1 Mark Q&A] – qChem+ – The Home of Chemistry")
- Jun 28, 2026
Learn what is Le Chatelier’s Principle with this concise 1 Mark Q&A from qChem+, The Home of Chemistry. Understand chemical...
![What is Electronegativity? [1 Mark Q&A] – qChem+ chemistry featured image explaining the ability of an atom to attract bonding electrons, with periodic table trends and electron pull illustration for HSC, SSC, O Level, AS Level, and A Level Chemistry students.](https://qchemplus.com/wp-content/uploads/2026/06/What-is-electronegativity-1-mark-QA-820x430.webp "What is Electronegativity? | 1 Mark Q&A for Chemistry Students – qChem+")
- Jun 25, 2026
Learn what is electronegativity with this concise 1 Mark Q&A by qChem+. Understand how atoms attract bonding electrons and explore...
![Define Empirical Formula [1 Mark Q&A] – qChem+ chemistry featured image explaining the simplest whole-number ratio of atoms in a compound with molecular formula and empirical formula examples for HSC, SSC, O Level, AS Level, and A Level Chemistry students.](https://qchemplus.com/wp-content/uploads/2026/06/Define-empirical-formula-1-mark-QA-1-820x430.webp "Define Empirical Formula | 1 Mark Q&A for Chemistry Students – qChem+")
- Jun 19, 2026
Learn how to define empirical formula with this concise 1 Mark Q&A by qChem+. Understand the simplest whole-number ratio of...
- Jun 15, 2026
qChem+ brings you HSC 2025 Chemistry 1st Paper MCQ Question Rajshahi Board English Version. Join qChem+ Ongoing batches in Pallabi,...
- Jun 15, 2026
qChem+ brings you HSC 2025 Chemistry 1st Paper MCQ Question Rajshahi Board Bangla Version. Join qChem+ Ongoing batches in Pallabi,...
- Jun 13, 2026
qChem+ brings you HSC 2025 Chemistry 1st Paper MCQ Question Chattogram Board English Version. Join qChem+ Ongoing batches in Pallabi,...
- Jun 12, 2026
qChem+ brings you HSC 2025 Chemistry 1st Paper MCQ Question Chattogram Board Bangla Version. Join qChem+ Ongoing batches in Pallabi,...
- Jun 12, 2026
qChem+ brings you HSC 2025 Chemistry 1st Paper MCQ Question Dhaka Board Bangla Version. Join qChem+ Ongoing batches in Pallabi,...
- Jun 12, 2026
qChem+ brings you HSC 2025 Chemistry 1st Paper MCQ Question Dhaka Board English Version. Join qChem+ Ongoing batches in Pallabi,...
![What is Electron Affinity? or Define Electron Affinity. [1 Mark Q&A] – qChem+ The Home of Chemistry educational chemistry featured image showing an atom gaining an electron, electron affinity concept, and periodic table elements for HSC, SSC, O Level, AS Level, and A Level students.](https://qchemplus.com/wp-content/uploads/2026/06/What-is-electron-affinity-1-mark-QA-820x430.webp "What is electron affinity – [1 mark Q&A] – qChem+ – The Home of Chemistry")
- Jun 9, 2026
Learn how to properly answer: What is electron affinity? or Define electron affinity, 1 mark questions from qChem+-The Home of...
![Define Ionization Energy [1 Mark Q&A] – qChem+ The Home of Chemistry educational chemistry featured image with atomic structure, electron removal concept, and ionization energy explanation for HSC, SSC, O Level, AS Level, and A Level students.](https://qchemplus.com/wp-content/uploads/2026/06/What-is-ionization-energy-1-mark-QA-820x430.webp "What is ionization energy – 1 mark Q&A")
- Jun 9, 2026
Learn how to properly answer: What is ionization energy? or Define ionization energy, 1 mark questions from qChem+-The Home of...
- Jun 8, 2026
Join the new July 2026 Chemistry batches at qChem+ – The Home of Chemistry. Specialized courses for HSC 1st Year,...
- Jun 4, 2026
qChem+ proudly celebrates reaching 1,000 followers on Facebook. Thank you to our students, parents, educators, and chemistry enthusiasts for being...
- Jun 4, 2026
The qChem+ Student Referral Partner Program rewards you with BDT 500 for every successful student enrollment. Simply refer students interested...
- May 28, 2026
qChem+ brings SSC 2026 Chemistry MCQ Question Dhaka Board English Version for you. Practice material for SSC 2027 students.
![What is Stereoisomerism? [1 Mark Q&A] – qChem+ chemistry featured image explaining stereoisomerism, compounds with the same molecular formula and connectivity but different three-dimensional arrangements, including geometrical, optical, and conformational isomerism for HSC, SSC, O Level, AS Level, and A Level Chemistry students.](https://qchemplus.com/wp-content/uploads/2026/09/What-is-Stereoisomerism-1-mark-QA-300x157.webp)
![A detailed educational infographic titled "What is Mole Fraction?" for qChem+, defining it as the ratio of moles of a component to the total moles in a mixture, with a beaker illustration and formulas for components A, B, and C. It features the qChem+ logo from The Quality Corporates Bangladesh Ltd. and a "[1 Mark Q&A]" call-out.](https://qchemplus.com/wp-content/uploads/2026/09/What-is-Mole-Fraction-1-mark-QA-300x158.webp)
![What is Partial Pressure? [1 Mark Q&A] – qChem+ chemistry featured image illustrating partial pressure in a gas mixture, showing individual gas pressures and Dalton’s law of partial pressures for HSC, SSC, O Level, AS Level, and A Level Chemistry students.](https://qchemplus.com/wp-content/uploads/2026/06/What-is-Partial-Pressure-1-mark-QA-300x157.webp)
![What is Enantiomer? [1 Mark Q&A] – qChem+ chemistry featured image illustrating enantiomers as non-superimposable mirror images with chiral molecules, stereochemistry concept, and optical isomerism for HSC, SSC, O Level, AS Level, and A Level Chemistry students.](https://qchemplus.com/wp-content/uploads/2026/06/What-is-Enantiomer-1-Mark-QA-–-qChem-The-Home-of-Chemistry-1-300x158.webp)
![What is Standard Enthalpy Change of Formation? [1 Mark Q&A] – qChem+ chemistry featured image explaining standard enthalpy change of formation (ΔH°f), showing the formation of one mole of a compound from its elements in their standard states for HSC, SSC, O Level, AS Level, and A Level Chemistry students.](https://qchemplus.com/wp-content/uploads/2026/06/What-is-Standard-Enthalpy-Change-of-Formation-1-Mark-QA-–-qChem-The-Home-of-Chemistry-300x156.webp)