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Question 17 : Which statement is false? Gases can be expanded without limit. The density of a gas is constant as long as its temperature remains constant. The molecular weight of a gaseous compound is a non-variable quantity. Gases diffuse into each other and mix almost immediately when put into the same container. Question 18 : A separation technique which involves charging particles and then attracting them to oppositely charged metal plates is called _____ separation. gravity electrostatic magnetic absorption Question 19 : Which of these is a derived physical quantity? Time Mass Area Luminous intensity Question 20 : Which of these terms is not used to describe a solid which remains behind during a separation process? sediment filtrate solution residue
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