Advertisements
Advertisements
प्रश्न
Which of the following is a mixture ?
Salt, Air, Water, Alum, Sugar
Advertisements
उत्तर
Among the given options, air is a mixture as it is composed of different gases.
APPEARS IN
संबंधित प्रश्न
What do you mean by the inter-molecular spaces? How do they vary in different states of matter?
Solids have definite shape and definite volume.
Name the processes involved in two cases.
Fill in the blank :
The state of matter with definite volume and definite shape is called______
Classify the following into elements, compounds and mixtures:
- Sodium
- Soil
- Sugar solution
- Silver
- Calcium carbonate
- Tin
- Silicon
- Coal
- Air
- Soap
- Methane
- Carbon dioxide
- Blood
What name is given to those elements which are neither good conductors of electricity like copper nor insulators like sulphur ?
Choose the correct answer.
A 15% alcohol solution means :
Calculate the concentration of a solution which contains 2.5 g of salt dissolved in 50 g of water.
What is the concentration of a solution which contains 16 g of urea in 120 g of solution ?
State whether the following statement is true or false :
Bread is an example of solid foam.
Which of the following is a sol ?
Shaving cream, Milk, Fog, Soap solution, Hairspray
Name the different types of solutions. Give one example of each.
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.
What difference in the property of two miscible liquids enables their separation by fractional distillation ?
Which technique can be used to detect and identify traces of poison present in the stomach wash of a person ?
How is scrap iron separated from a heap of waste materials in factories?
Which one of the following scrap metal cannot be separated by magnetic separation ?
Select the correct answer from A, B, C, D & E for the statement given below:
An atom or group of atoms _________ having a resultant charge.
Liquids have ______.
Define the term matter.
