C.B-3 An element as a basic …

C.B-3 An element as a basic form of matter that cannot be broken down into simpler substances by chemicalreactions. Elements can be normally divided into metals, non-metals and metalloids. Examples ofmetals are gold, silver, copper etc. Examples of non-metals are hydrogen, oxygen, iodine etc. Someelements have intermediate properties between those of metals and non-metals, they are calledmetalloids. A compound is a substance composed of two or more elements, chemically combined withone another in a fixed proportion. The material obtained by the group I is a mixture of the twosubstances. The properties of the mixture are the same as that of its constituents. Q.58) ________ is the only metal that is liquid at room temperature. a. silver b. gold c. copper d. mercury Q.59)The colourless gas with the smell of rotten egg is found in a. group II b. group IV c. group III d. group I Q.60)The constituent of compounds are separated by a. both chemical reaction and electrochemical reaction b. electrochemical reaction c. none of these d. chemical reaction

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WHAT IS UNIT OF LIFE

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If one mole of carbon atoms weighs 12 grams, what is the mass (in grams) of 1 atom of carbon?

What is ER??

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