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प्रश्न
How will you separate a mixture of iron filings and powdered carbon ?
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उत्तर
We can separate a mixture of iron filings and powdered carbon by using a magnet. The principle behind the separation of iron fillings and powdered carbon is the property of iron to get attracted by magnets. When the magnet is brought close to the mixture, iron fillings are attracted by the magnet and get collected on the surface of the magnet. In the process, powdered carbon is left behind as residue.
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संबंधित प्रश्न
Liquids have definite volume but do not have definite shape.
Name a liquid which can be classified as a pure substance and conducts electricity.
Explain why, hydrogen and oxygen are considered elements whereas water is not considered an element.
Which of the following are compounds ?
- CO
- No
- NO
- Co
Which of the following does not have a fixed melting point/boiling point ?
There are three substances X, Y and Z. The substance X does not have a fixed melting point or boiling point and it still shows the individual properties of its constituents. The substance Y is a pure substance which occurs in nature as such. The substance Y has a fixed melting point and boiling point but it cannot be broken down into simpler substances by any chemical means. The substance Z is also a pure substance whose properties are entirely different from those of its constituents. The substance Z can, however, be divided by electrolysis into two substances which belong to the same class of substances as Y.
- What type of substance could X be ? Name one substance like X.
- What type of substance could Y be ? Name one substance like Y.
- What type of substance could Z be ? Name one substance like Z.
- Which process involves absorption or release of an appreciable amount of energy : formation of substance X or formation of substance Z ?
- Name the three groups into which all the substances like Y are divided on the basis of their properties.
What will happen if a saturated solution is :
- heated
- cooled
What is meant by a solution?
Which one of the following is not a chemical change ?
One of the following represents the solution of solid in a solid. This one is :
Name the process by which all the dye can be recovered from black ink.
Which method is better for recovering sugar from sugar solution : evaporation or crystallisation ? Give reason
for your answer.
Tincture of iodine is a mixture of two materials X and Y. The material Y has a property that its solid form can be converted directly into vapours on heating by a process called Z.
- What could X be ?
- What could Y be ?
- Name the process Z.
- Which process would you use to recover both the components X and Y from tincture of iodine ?
- Which process can be used to recover only component Y from tincture of iodine ?
______ is not made of matter.
State whether true or false. If false, correct the statement.
Oil and water are immiscible with each other.
Diffentiate between absorption and adsorption.
Solids possess very high kinetic energy.
Atoms are tiny particles that repel each other when they are squeezed very close.
A teabag placed in a cup of hot water will diffuse into the water.
Define the term matter.
