This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.
ScanSolve AI Answer
Another one Noor — let's solve it. Here are the solutions to the multiple-choice questions: 1. A substance that is made up of same type of atoms is called: An element* is a pure substance consisting only of atoms that all have the same numbers of protons in their atomic nuclei. C)* Element 2. Which of the following is a homoatomic molecule? A homoatomic molecule* is composed of only one type of atom. H_2 consists only of hydrogen atoms. H_2O, CO_2, and NH_3 are heteroatomic as they contain different types of atoms. A)* H_2 3. The Uranium is radioactive element because: Radioactive elements have unstable nuclei that spontaneously decay, emitting radiation to become more stable. C)* It nucleus is unstable and emits radiation 4. Which of the following is a chemical change: Rusting of iron* is a chemical change where iron reacts with oxygen and water to form iron oxides (rust), creating new substances. Melting, dissolving, and boiling are physical changes as they do not alter the chemical composition. B)* Rusting of iron 5. The demarcation of periodic table has been divided in to: The periodic table is divided into four main blocks based on the electron configuration of the elements: s-block, p-block, d-block, and f-block. D)* Four blocks 6. An alloy is that homogenous mixture of: An alloy* is a homogeneous mixture of two or more metals, or a metal and a non-metal, where the components are uniformly distributed. D)* Two solids 7. The formula that indicates actual number and type of atoms in a molecule is called: A molecular formula* shows the exact number of atoms of each element in a molecule. C)* Molecular formula 8. Name the material of screen which is used in Rutherford atomic model: In Rutherford's gold foil experiment, a zinc sulfide (ZnS) screen was used to detect the scattered alpha particles, as ZnS fluoresces when struck by alpha particles. B)* Zinc Sulphide 9. Bond formed by mutual sharing of electrons is: A covalent bond* is formed when two atoms share one or more pairs of electrons to achieve a stable electron configuration. C)* Covalent bond 10. The density of gases increases when it's: Density is mass per unit volume ( = m/V). For a fixed mass of gas, increasing pressure compresses the gas, reducing its volume and thus increasing its density. Decreasing temperature also reduces volume (at constant pressure), increasing density. A)* Pressure increased 11. A saturated solution of KCl on heating becomes: When a saturated solution is heated, its solubility generally increases, meaning it can dissolve more solute. Therefore, a saturated solution on heating becomes unsaturated* as it can now accommodate more solute. A)* Unsaturated 12. What is the particle size in suspension? Suspensions* are heterogeneous mixtures with large solute particles that eventually settle out. Their particle size is generally greater than 10^3 nm (or 1000 nm). D)* Greater than 10^3 nm What's next? 📸