Boron – Element Profile Symbol: BAtomic Number: 5Atomic Mass: 10.81 uPosition in the Periodic Table: Group 13 (Boron Group), Period 2Electronic Configuration: 1s² 2s² 2p¹Valency: 3Block: p-block elementType: Metalloid (exhibits properties of both metals and non-metals) Occurrence Boron does not occur freely in nature due to its high reactivity. It is found in the form…
MCQs on Acids, Bases, and Salts 1. Which of the following acids is an organic acid?A) HClB) H2SO4C) CH3COOH ✅D) HNO3 2. Which acid is dibasic?A) HClB) H2SO4 ✅C) HNO3D) CH3COOH 3. A strong acid is one that:A) Dissociates partially in waterB) Furnishes OH⁻ ionsC) Dissociates almost completely to give H₃O⁺ ✅D) Contains carbon 4….
1. 50 Multiple Choice Questions (MCQs) Q1. The force of attraction between two atoms in a molecule is called:a) Electrovalencyb) Chemical bondc) Ionization energyd) ElectronegativityAnswer: b Q2. The electrostatic force of attraction between oppositely charged ions is called:a) Covalent bondb) Electrovalent bondc) Metallic bondd) Coordinate bondAnswer: b Q3. The number of electrons an atom loses…
50 MCQ Questions on Periodic Properties 1. Modern Periodic Law states that the physical and chemical properties of elements are a periodic function of their:A) Atomic massB) Atomic numberC) ValencyD) Density 2. Periodicity is mainly caused by:A) Similar atomic massesB) Periodic repetition of outer electronic configurationC) Similar densitiesD) Similar nuclear charge 3. Which of the…
1. Introduction to Atmospheric Pollution 🌍 Atmospheric pollution is the contamination of the air by the introduction of harmful substances or energy. It can be caused by natural events like forest fires and volcanic eruptions, but it’s primarily the result of human activities such as the burning of fossil fuels and industrial processes. The chapter…
1. Introduction to Gas Laws 💨 Gas laws are fundamental principles that describe the relationship between the measurable properties of gases: pressure (P), volume (V), and temperature (T). These laws are based on observations of how gases behave when one or more of these properties are changed. The laws assume that gases are composed of…
1. The Need for Classification 🧐 The Periodic Table is a fundamental tool in chemistry that organizes all known elements. Early chemists faced the challenge of organizing the growing number of elements and understanding the relationships between their properties. This led to several attempts at classification. 2. The Modern Periodic Table ⚛️ The modern periodic…
1. Position of Hydrogen in the Periodic Table Hydrogen is the lightest element and holds a unique position in the periodic table. It can be placed in two groups because its properties are similar to both: Due to these dual properties, hydrogen is often placed in a separate position at the top of the periodic…
1. Water as a Solvent 💧 Water is a universal solvent due to its polar nature. The water molecule (H2O) has a bent structure with a partial negative charge on the oxygen atom and a partial positive charge on the hydrogen atoms. This polarity allows water to dissolve a wide range of substances by surrounding…
1. Introduction to Metallurgy Metallurgy is the science and technology of extracting metals from their ores and refining them for use. An ore is a naturally occurring rock or mineral from which a metal can be extracted profitably. A mineral is a naturally occurring chemical substance with a specific crystal structure and chemical composition. Not…
