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प्रश्न
Fill in the following blanks with suitable words :
The elements which are sonorous are called ..........................
उत्तर
The elements that are sonorous are called metals.
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संबंधित प्रश्न
Name the terms for the change of a solid into liquid.
Define the following term of Atom .
Explain why steel is used to make railway lines.
What are the characteristics of matter?
Fill in the following blanks with suitable words :
An element is made up of only one kind of ........
Classify the following as elements or compounds :
Iron, Iron sulphide, Sulphur, Chalk, Washing soda, Sodium, Carbon, Urea
Which of the following statements are true for pure substances ?
- pure substances contain only one kind of particles
- pure substances may be compounds or mixtures
- pure substances have the same composition throughout
- pure substances can be exemplified by all elements other than nickel
There are three substances X, Y and Z. The substance X does not have a fixed melting point or boiling point and it still shows the individual properties of its constituents. The substance Y is a pure substance which occurs in nature as such. The substance Y has a fixed melting point and boiling point but it cannot be broken down into simpler substances by any chemical means. The substance Z is also a pure substance whose properties are entirely different from those of its constituents. The substance Z can, however, be divided by electrolysis into two substances which belong to the same class of substances as Y.
- What type of substance could X be ? Name one substance like X.
- What type of substance could Y be ? Name one substance like Y.
- What type of substance could Z be ? Name one substance like Z.
- Which process involves absorption or release of an appreciable amount of energy : formation of substance X or formation of substance Z ?
- Name the three groups into which all the substances like Y are divided on the basis of their properties.
Which of the two will scatter light : soap solution or sugar solution ? Why ?
What happens when the temperature of a saturated sugar solution is increased ?
Explain what happens when a beam of light is passed through a colloidal solution.
What will happen if a saturated solution is :
- heated
- cooled
What is the general name of the process by which tea-leaves are separated from prepared tea ?
How will you separate a mixture containing sand and sugar ?
What is fractional distillation ? What is the use of fractionating column in fractional distillation ?
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 ?
Matter is made up of ______.
You want to wear your favourite shirt to a party, but the problem is that it is still wet after a wash. What steps would you take to dry it faster?
Gases do not diffuse very easily.
Give an example of liquid in gas.
