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प्रश्न
The elements which normally exist in the liquid state are :
पर्याय
bromine and iodine
mercury and chlorine
iodine and mercury
bromine and mercury
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उत्तर
bromine and iodine
Mercury is a metal that exists in liquid state and bromine is a non-metal that exists in liquid state.
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संबंधित प्रश्न
The smallest unit of matter that exists freely in nature is called ...........
Solids have definite shape and definite volume.
Gases have definite volume but no definite shape.
Differentiate between an atom and a molecule.
Fill in the blank :
The state of matter with definite volume and definite shape is called______
Give one difference between atoms and molecules.
Fill in the blank
Any matter which has a definite _______ but no definite shape is called a _______
Which of the following materials fall in the category of a “pure substance”?
- Ice
- Milk
- Iron
- Hydrochloric Acid
- Calcium oxide
- Mercury
- Brick
- Wood
- Air
Name a metal which is soft and a non-metal which is hard.
Give reason why graphite is used for making elecrode in a dry cell.
What is meant by (i) elements (ii) compounds, and (iii) mixtures ?Write down the names of two elements, two compounds and two mixtures.
In what respects does a true solution differ from a colloidal solution ?
One of the following represents the solution of solid in a solid. This one is :
When the solid A is added to water, it dissolves with the evolution of a lot of heat and making little explosions to form two products B and C. The properties of products B and C are entirely different from those of solid A as well as water. Moreover, products B and C cannot be reconverted into solid A and water. When another solid D is added to water, it dissolves with the absorption of a little heat to form a product E which cools down. The product E shows the properties of both, solid D as well as water. Moreover, product E can be converted into solid D and water.
(a) What type of change occurs when solid A is dissolved in water ? Why ?
(b) What type of change occurs when solid D is dissolved in water ? Why ?
(c) Name a metal which you think could behave like solid A. Also name the products B and C.
(d) Name the solid D if it is the one which is used in making ordinary dry cells.
(e) Name the process by which D can be recovered from E.
A carpenter wants to separate iron nails from saw-dust. Which method of separation should he choose ?
What is chromatography ? State its two applications.
Draw a labelled diagram of the fractional distillation apparatus used for separating a mixture of alcohol and water.
Differentiate between the-two characteristics of matter – ‘mass’ & ‘weight’.
Write a scientific reason.
Lemon sherbat has sweet, sour and salty taste and it can be poured in a glass.
