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प्रश्न
Fill in the following blanks with suitable words :
Brass is an alloy which is considered a ..............
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उत्तर
Brass is an alloy, which is considered as mixture.
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संबंधित प्रश्न
Which one is a kind of matter:
Bromine and air take about 15 minutes to diffuse completely but bromine diffuses into a vacuum very rapidly. Why is this so?
What is meant by saying that metals are sonorous ?
What name is given to those elements which are neither good conductors of electricity like copper nor insulators like sulphur ?
Explain why, hydrogen and oxygen are considered elements whereas water is not considered an element.
Name a metal which forms amalgams.
What are the three general classes of matter ? Give one example of each type.
Which of the following is not an element ?
Which one of the following is not a metalloid ?
Classify the following into true solutions and colloidal solutions:
Ink, Salt solution, Starch solution, Blood, Sugar solution
What do you understand by the statement " the solubility of copper sulphate in water at 20°C is 20.7 g" ?
What is a colloid ? Give two examples of colloids (or colloidal solutions)
Which one of the following is not a chemical change ?
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 ?
State whether the following statement are true or false :
Alcohol can be separated from a mixture of alcohol and water by a separating funnel.
The dyes present in fountain pen ink can be separated by the technique of :
Which of the following cannot be separated from air by the process of fractional distillation ?
Explain the meaning of the term matter with special reference to the term ‘substance’.
Gases change to liquid by the process of ______.
Define the term matter.
