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प्रश्न
Fill in the blank
All matter is made up of tiny particles called ______
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उत्तर
All matter is made up of tiny particles called atoms.
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संबंधित प्रश्न
What do you mean by the inter-molecular spaces? How do they vary in different states of matter?
State two characteristics of matter demonstrated by Brownian motion.
What name is given to those elements which are neither good conductors of electricity like copper nor insulators like sulphur ?
Classify the following into elements and compounds :
- H2O
- He
- Cl2
- CO
- Co
Explain why, hydrogen and oxygen are considered elements whereas water is not considered an element.
What are the three general classes of matter ? Give one example of each type.
The elements which normally exist in the liquid state are :
Which of the two will scatter light : soap solution or sugar solution ? Why ?
Choose the correct answer.
A 15% alcohol solution means :
Name the different types of solutions. Give one example of each.
Which of the following can be called a suspension ?
Tincture of iodine has antiseptic properties. This solution is made by dissolving :
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 ?
How is scrap iron separated from a heap of waste materials in factories?
You are given a mixture of iodine in alcohol called tincture iodine. Which method will you use to recover both, iodine as well as alcohol, from this mixture ?
Which among the following ______ will get attracted to by magnet?
Name the metals that are used in jewellery.
Why wires cannot be drawn from materials such as stone or wood?
Atoms or groups of atoms having a charge are called ______.
The physical state of water at 373 K is ______.
