Question

CHAPTER-2 (SCIENCE) CLASS-IX : Is matter around us pure? 1) A pure substance which is made up of only one kind of atom and cannot be broken into two or more simpler substances by physical or chemical means is referred to as (a) a compound (b) an element (c) a molecule (d) a mixture 2) Which of the following property does not describe a compound? (a) It is composed of two or more elements (b) It is a pure substance. (c) It cannot be separated into constituents by physical means (d) It is mixed in any proportion by mass 3) According to the definition of pure substance, which of the following is a pure substance? (a) Ice (b) Mercury (c) Iron (d) All of these 4) What is the name of the metal which exists in liquid state at room temperature? (a) Mercury (b) Bromine (c) Sodium (d) Potassium

Answer 1

Answer:

4) Mercury 1) an element 2) b) it is pure substance 3All are pure because substance do not contain any compounds......

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