2. Elements and Compounds 1. Which of the following is an element?WaterSaltVinegarMercury2. Which of these is not an element? SiliconSodiumSteelSulphur3. Which of the following contains a mixture, an element and a compound? Soil, Calcium, SugarAir, seawater, ammoniaSulphur, water, Sodium chlorideMagnesium, Carbon di - oxide , Aluminium4. Which of the following is a molecule of a compound? OxygenChlorineNitrogenAmmonia5. Select the odd one out - MercurySodiumCalciumMagnesium6. Formula for Vinegar is CH3COOH. Which of the following represents the elements it contains? Carbon, water, and OxygenCarbon, Hydrogen and OxygenCarbon and waterCarbon, water and Oxygen7. Angie found a yellow powdery substance which has a strong smell and does not conduct electricity. What is it? MetalNon - metalBoth the aboveMetalloid8. Calculate the total number of atoms in Ammonium sulphate with the formula (NH4)2SO4. 141511129. What are the elements found in steam?Hydrogen and OxygenSulphur and OxygenOxygen and SteelWater and Oxygen10. What is the chemical symbol of Sodium and Potassium respectively?S and PS and KNa and KNa and P11. Choose the element which belongs to the same group as Magnesium.SodiumAluminium CalciumScandium12. Element Rubidium belongs to group 1. Which is not its property?Its a good conductor of electricity.It has a high density.It is a liquidIt is malleable.13. Which of the following non - metals is not a gas at room temperature?HeliumBromineChlorineNeon14. What is true about elements belonging to the same group?They have same symbol.They show gradual change of states.They show similar chemical properties.They show range of properties from metallic property to non metallic property.
