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प्रश्न
What is the general name of the materials which contain at least two pure substances and show the properties
of their constituents ?
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उत्तर
Materials that are made up of two or more pure substances and show the properties of their constituents are called mixtures.
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संबंधित प्रश्न
All kinds of matter
What is the other name for impure substances ? Give two examples of impure substances.
Iron powder and sulphur powder were mixed together and divided into two parts A and B. When part A was heated strongly over a burner, then a substance C was formed. The part B was, however, not heated at all. When dilute hydrochloric acid was added to substance C, then gas D was evolved and when dilute hydrochloric acid was added to part B then gas E was evolved.
- What type of substance is B ?
- What type of substance is C ?
- Name the gas (i) D, and (ii) E ?
- State one characteristic property of gas D.
- Write one test to identify gas E.
Which of the following contains less solute at a given temperature and pressure ? Unsaturated solution or Saturated solution.
Which of the following will show Tyndall effect ? Why ?
- Salt solution
- Starch solution
- Milk
- Copper sulphate solution
Which of the following do not exhibit Tyndall effect ?
Starch solution, Sugar solution, Ink, Salt solution, Copper sulphate solution, Ammonium chloride solution, Fog, Smoke, Car exhausts.
Which of the following are chemical changes and which physical ? Give reason.
- a glass bottle breaking
- coal burning in air
- making a cake
- wool being knitted into a sweater
What is the effect of temperature on the solubility of solids in liquids ?
100 mL of water at room temperature of 25°C is taken in a beaker and a little of solid S is dissolved in it by stirring to obtain a solution X. More and more of solid S is added to the solution with constant stirring, while keeping the temperature of solution constant at 30°C. After some time it is observed that no more solid dissolves in water and at the same time some solid is also left undissolved at the bottom of the beaker.
- The contents of beaker are filtered through a filter paper to obtain solution Y in the form of a filtrate.
- What name is given to solutions like X ?
- What name is given to solutions like Y ?
- What will you observe if the solution Y at 30°C is cooled down to 10°C by keeping the beaker in crushed ice ? Why ?
- What term is used to denote the amount of solid dissolved in 100 grams of water in a solution lie Y ?
Name the source from which nitrogen and oxygen are obtained on a large scale.
Describe a method to separate a mixture of common salt and sand.
How will you separate a mixture of common salt, sulphur powder and sand ?
Describe a method for separating a mixture of iron filings and sulphur powder other than that by using a magnet.
Explain how, impure copper sulphate can be purified by crystallisation.
Which of the following cannot be separated from air by the process of fractional distillation ?
What's the solution?
We need to make a sherbet quickly for some guests. But we only have sugar candy in the house.
What type of matter glass is?
Solids possess very high kinetic energy.
Define the term matter.
Define the term matter.
