Is Matter around us Pure? — Important Questions
Madhya Pradesh Board · Class 9 · Science
26 important questions from Is Matter around us Pure? for Madhya Pradesh Board Class 9 Science, with answers. Includes multiple choice, multiple correct.
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Important Questions from Is Matter around us Pure?
Which of the following properties are shown by metals? (Select all correct answers)
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They have lustre (shine), They conduct heat and electricity, They are malleable, They are sonorous
Metals show lustre, conduct heat and electricity, are malleable (can be hammered into sheets), and are sonorous (make ringing sounds). Being poor conductors of electricity is a property of non-metals, not metals.
Which of the following are examples of colloids? (Select all correct answers)
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Milk, Fog, Jelly, Smoke
Milk, fog, jelly, and smoke are all colloids where particles are dispersed in a medium but are not visible to naked eyes. Sugar solution is a true solution, not a colloid.
Which of the following statements about compounds are correct? (Select all correct answers)
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They have a fixed composition, They show properties different from their constituent elements, They are formed by chemical combination of elements
Compounds have fixed composition, show different properties from constituent elements, and are formed by chemical combination. They cannot be separated by physical methods and do not have variable composition (that's a property of mixtures).
What is the formula for mass by mass percentage of a solution?
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(Mass of solute/Mass of solution) × 100
Mass by mass percentage is calculated by dividing the mass of solute by the total mass of solution and multiplying by 100. This gives the percentage of solute by mass in the solution.
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