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प्रश्न
Which of the following are ‘pure substances’ ?
Ice, Milk, Iron, Hydrochloric acid, Calcium oxide, Mercury, Brick, Wood, Air
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उत्तर
Iron and mercury are pure substances because these are elements. Hydrochloric acid, calcium oxide, and ice are also pure substances, as they are compounds.
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संबंधित प्रश्न
Which of the following materials fall in the category of a “pure substance”?
- Ice
- Milk
- Iron
- Hydrochloric Acid
- Calcium oxide
- Mercury
- Brick
- Wood
- Air
What are the conditions for 'something' to be called 'matter'?
During respiration, glucose and oxygen enter our body cells and waste products carbon dioxide and water leave the body cells by the process of :
Name a non-metal which is a good conductor of electricity.
What elements do the following compounds contain ?
Sugar, Common salt
Name a metal which has a low melting point.
What is the most common way of expressing the concentration of a solution ?
Which of the following contains less solute at a given temperature and pressure ? Unsaturated solution or Saturated solution.
Which of the following is not an emulsion ?
What difference in the property of two miscible liquids enables their separation by fractional distillation ?
State whether the following statement are true or false :
Alcohol can be separated from a mixture of alcohol and water by a separating funnel.
What is the general name of the process by which tea-leaves are separated from prepared tea ?
Which technique is used in a washing machine to squeeze out water from wet clothes while drying ?
How will you separate a mixture of iron filings, chalk powder and common salt ?
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 ?
State whether true or false. If false, correct the statement.
Oil and water are immiscible with each other.
______ is a smallest particle.
What type of matter glass is?
Gases do not diffuse very easily.
