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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
Name the terms for the change of vapour into a liquid.
When a crystal of potassium permanganate is placed in a beaker, its purple colour spreads throughout the water. What does this observation tell us about the nature of potassium permanganate and water?
What is the other name for impure substances ? Give two examples of impure substances.
What are the three groups into which all the elements can be divided ? Name two elements belonging to each group.
Give reason why copper metal is used for making electric wires.
Name a metal which forms amalgams.
Which one of the following is not a metalloid ?
On the basis of composition of matter, milk is considered to be :
Out of a colloid, solution and a suspension :
which one has the smallest particles ?
Fill in the following blank :
Milk is a .................... solution but vinegar is a .................... solution.
What will happen if a saturated solution is :
- heated
- cooled
9.72 g of potassium chloride dissolves in 30 g of water at 70°C. Calculate the solubility of potassium chloride at that temperature.
Define solubility of a substance. How does it vary with temperature ?
What is a suspension ? Give two examples of suspensions.
State whether the following statement are true or false :
Salt and water can be recovered from an aqueous salt solution by the process of evaporation.
How is scrap iron separated from a heap of waste materials in factories?
How will you separate iron pins from sand ?
The given mixture contains three constituents A, B and C. The constituent A is a yellow coloured, solid element which dissolves in a liquid D. The constituent B is a blue coloured salt which is insoluble in liquid D but dissolves easily in another liquid E. The constitudent C is a liquid which is used in cooking food and forms a solid fat on hydrogenation.
(a) What do you think could (i) constituent A, and (ii) liquid D be ?
(b) What could (i) constituent B, and (ii) liquid E be ?
(c) What could liquid C be ?
(d) How will you separate the mixture containing A, B and C ?
Atoms or groups of atoms having a charge are called ______.
Compressibility of solids: ______.
