Advertisements
Advertisements
प्रश्न
The material which is added to water during purification process at the water works so as to disinfect it is :
विकल्प
potassium permanganate
betadine
chlorine
potash alum
उत्तर
chlorine
Chlorine is added to water to purify it from the impurities such as bacteria.
APPEARS IN
संबंधित प्रश्न
The smallest unit of matter that exists freely in nature is called ...........
Fill in the following blank with suitable words :
The best evidence that the particles of matter are constantly moving comes from the studies of ................. and ...................
The three important metalloids are.............................. and ..........................
Explain why, hydrogen and oxygen are considered elements whereas water is not considered an element.
On the basis of composition of matter, milk is considered to be :
What is the most common way of expressing the concentration of a solution ?
How will you differentiate between a suspension and a colloid ?
Define Sol and give one example.
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.
Name the source from which nitrogen and oxygen are obtained on a large scale.
Name the process by which the various gases of the air are separated.
Name the process you would use to separate a mixture of water and alcohol.
Fill in the following blanks with suitable words :
Miscible liquids are separated by .....................
Fill in the following blanks with suitable words :
The separation of liquids by fractional distillation is based on the difference in their .....................
How will you separate camphor, common salt and iron nails from their mixture ?
Which of the following mixture cannot be separated by using water as the solvent ?
Asmita went to buy an earthen pot. There she saw many things kept for sale.
What is the difference between a substance and an object?
The non S I and S I units of some physical quantities are given in column A and column B respectively. Match the units belonging to the same physical quantity:
| (A) | (B) | ||
| (a) | degree celsius | (i) | kilogram |
| (b) | centimetre | (ii) | pascal |
| (c) | gram per centimetre cube | (iii) | metre |
| (d) | bar | (iv) | kelvin |
| (e) | milligram | (v) | kilogram per metre cube |
Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.
Name a non-metal which exists as a liquid at room temperature.
