Question Detail The most abundant element in the earth's crust is ? AluminiumNitrogenSiliconOxygen Answer: Option D Ad Similar Questions : 1. Which one of the following metals does not react with water to produce Hydrogen? CadmiumLithiumPotassiumSodium Answer: Option A 2. What is a mixture of potassium nitrate powdered charcoal and sulphur called? paintaluminiumbrassgun powder Answer: Option DExplanation:gun powder is the mixture of potassium nitrate powdered charcoal and sulphur. 3. Which of the following is produced during the formation of photochemical smog ? Nitrogen OxidesHydrocarbonsMethaneOzone Answer: Option D 4. Oxides of metals are alkaline. TRUEFALSE Answer: Option A 5. Which of the following elements behave chemically both as a metal and a non metal? BoronCarbonArgonMercury Answer: Option A Read more from - Chemistry Questions Answers