ANSWER: The formation of a uninegative ion is an exothermic reaction. This is because energy is released when an extra electron enters a neutral atom and is attracted by its nucleus. B + e– ⟶ B– ∆H = Negative (Ref.…
ANSWER: The formation of a positive ion is always an endothermic reaction. The reason is that positive ion is formed by the removal of one or more electrons from the neutral atom. Since, electrons are strongly held by the nucleus,…
ANSWER: IONS: “Those species which carry either positive or negative charge are called ions.” Examples: K+, Mg2+, Al3+, Cl–, O2–, CO32– etc. Conditions for the Formation of Ions: 1) Positive ions or cations are produced when an atom loses one…
ANSWER: MACROMOLECULES: “The molecules consisting of thousands of atoms are called macromolecules. Their molecular masses range from thousands to millions.” Examples: Haemoglobin is a macromolecule found in blood. It carries oxygen from our lungs to all body parts. Each molecule…
ANSWER: ATOMICITY: “The number of atoms present in a molecule is called its atomicity.” The molecules may be: (Ref. An Insight Into Objective Chemsitry-11, Ch-01, Q. No. 07)
ANSWER: ATOM: MOLECULE: (Ref. An Insight Into Objective Chemsitry-11, Ch-01, Q. No. 06)
ANSWER: The objects of the size of an atom can be observed in an electron microscope. This is because electron microscope uses beams of electrons which have much shorter than that of visible light and atoms as well. (Ref. An…
Q.01: What is the contribution of Greeks towards the discovery of atom? ANSWER: Greek philosophers thought that matter could be divided into smaller and smaller particles to reach a basic unit, which could not be further sub-divided. Democritus (460–370 B.C.)…
BASIC CONCEPTS Here are complete topic-wise short questions and MCQs of our famous publication “An Insight Into Objective Chemistry-11”. Additional details and diagrams have been in this digital product, so you may call it plus or updated version of our…
INTRODUCTION This is soft version of our famous publication “An Insight Into Objective Biology-12”. Every question of the book has been given with the same arrangement. Each short question is dealt separately, with extra detail and infographics. The MCQs are…