chemistry Chemical properties Test 9 Welcome to your chemistry Chemical properties Test 9 Name Email 1.Barium nitrate is used in signal flares and fireworks that burns in bright ______ colour. (a) orange (b) blue (c) yellow (d) green None 2.The mineral Carnotite is an important source of: (a) copper (b) zinc (c) uranium (d) iron None 3.The mineral named ‘Calaverite’ is a telluride mineral containing: (a) zinc (b) gold (c) silver (d) copper None 4.Which of the following is a polar molecule? (a) Carbon tetrachloride (b) Carbon dioxide (c) Benzene (d) Water None 5.What is the boiling point of water at sea level? (a) 250°C (b) 50°C (c) 150°C (d) 100°C None 6.Which of the following elements’ salts are most soluble? (a) Lithium (b) Sodium (c) Rubidium (d) Potassium None 7.Which of the following statements is NOT true about compounds? (a) The composition of each new substance is always fixed. (b) The constituents can be separated only by chemical or electrochemical reactions. (c) Elements react to form new compounds. (d) Compounds have a variable composition None 8.Which of the following has the lowest melting point? (a) Zinc (b) Tin (c) Lead (d) Silver None 9.Which of the following observations DOES NOT help in determining whether a chemical reaction has taken place? (a) Change in height (b) Change in colour (c) Change in state (d) Evolution of a gas None 10..Which among the following is NOT an insulator? (a)Ebonite (b)Glass (c)Dry Paper (d)Mercury None 11. Atoms of different elements with different atomic numbers, having the same mass number is known as _______. (a)Isobars (b)Isohalines (c)Isotopes (d)Ion None 12. Metals produce ringing sound when hit another metal because they are ______. (a)Malleable (b)Ductile (c)Sonorous (d)Lustrous None Time's up
