Advertisements
Advertisements
प्रश्न
The material which is added to water during purification process at the water works so as to disinfect it is :
पर्याय
potassium permanganate
betadine
chlorine
potash alum
Advertisements
उत्तर
chlorine
Chlorine is added to water to purify it from the impurities such as bacteria.
APPEARS IN
संबंधित प्रश्न
Define matter.
Draw a flow-chart for the schematic representation of different types of matter.
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.
How much water should be added to 15 grams of salt to obtain 15 per cent salt solution ?
Choose one term from the following which includes the other three :
aerosol, emulsion, colloid, sol
Which of the following is a sol ?
Shaving cream, Milk, Fog, Soap solution, Hairspray
Fill in the following blank :
A colloid is a ..............mixture and its components can be separated by the technique known as ...............
In what respects does a true solution differ from a colloidal solution ?
Classify the following into true solutions and colloidal solutions:
Ink, Salt solution, Starch solution, Blood, Sugar solution
Explain what happens when a beam of light is passed through a colloidal solution.
How will you differentiate between a suspension and a colloid ?
Which of the following do not exhibit Tyndall effect ?
Starch solution, Sugar solution, Ink, Salt solution, Copper sulphate solution, Ammonium chloride solution, Fog, Smoke, Car exhausts.
One of the following represents the solution of solid in a solid. This one is :
The solubility of ammonium chloride in water at various temperatures is given below :
| Temperature | : | 10°C | 20°C | 40°C | 60°C | 80°C |
| Solubility | : | 24 g | 37 g | 41 g | 55 g | 66 g |
What mass of ammonium chloride would be needed to make a saturated solution of ammonium chloride in fifty grams of water at 40°C ?
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 ?
Describe a method for separating a mixture of iron filings and sulphur powder other than that by using a magnet.
Explain the meaning of the term matter with special reference to the term ‘substance’.
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 |
Higher the temperature, the higher the kinetic energy of particles.
