1. Metals are generally:A) Good conductors of heat and electricityB) Bad conductors of electricityC) Non-malleableD) BrittleAnswer: AExplanation: Metals conduct heat…
Browsing: Chemistry
1. A chemical reaction involves:A) Breaking and forming of bondsB) Only breaking of bondsC) Only forming of bondsD) Change in…
1. pH is defined as:A) log [H⁺]B) –log [H⁺]C) log [OH⁻]D) –log [OH⁻]Answer: BExplanation: pH = –log₁₀[H⁺], where [H⁺] is…
1. A catalyst is a substance that:A) Increases activation energyB) Increases equilibrium constantC) Speeds up the reaction without being consumedD)…
1. Hydrocarbons are compounds made up of:a) Carbon and oxygenb) Carbon and hydrogenc) Carbon and nitrogend) Carbon and sulphurAnswer: b)…
1. Drugs are chemical substances used for:a) Entertainment onlyb) Diagnosis, prevention, and treatment of diseasesc) Increasing soil fertilityd) Fuel productionAnswer:…
1. Fertilizers are substances used to:a) Increase soil acidityb) Supply nutrients to plantsc) Kill insectsd) Reduce water contentAnswer: b) Supply…
1. Radioactivity was discovered by:a) Marie Curieb) Henri Becquerelc) Rutherfordd) J.J. ThomsonAnswer: b) Henri BecquerelExplanation: In 1896, Henri Becquerel discovered…
1. The process of extraction of metals from their ores is called:a) Refiningb) Concentrationc) Metallurgyd) SmeltingAnswer: c) MetallurgyExplanation: Metallurgy is…
1. Which of the following is the primary source of energy on Earth?a) Coalb) Sunc) Petroleumd) Natural GasAnswer: b) SunExplanation:…