Skip to main content


physical and chemical properties of water

In this post, you will get complete information about physical and chemical properties of water. Physical properties of water The significance of water as the most important liquid is mainly due to its physical properties.  Some important physical properties of water are discussed in detail in the following section: Nature : Water is an odorless, tasteless and transparent liquid.  However, the taste of water is attributed to the presence of dissolved salts in it.  Volatile impurities also impart some odor to water.  Water is colorless in thin layers but it appears bluish in thick layers.   freezing points: : The freezing point of water is 0 ° C under normal atrmospheric pressure.  The freezing point of water decreases with an inerease in external pressure.  Presence of soluble impurities decreases the freezing point of water.   Boiling point: The boiling point of pure water is 100 ° C under normal atmospheric pressure.  The boiling point of water gets elevated due to the presence of
Recent posts

Factors affecting solubility

In this post, you will get complete information about Factors Affecting Solubility Factors affecting solubility nature of solute and solvent 1. Nature of the  Solubility ionic compounds or polar compounds are more soluble in polar solvents like water. non-polar compounds are more soluble in non-polar solvents like benzene .  2. Nature of the  Solubility the solvents which have high dielectric constants can dissolve polar and ionic compounds to a greater extent than the solvents with low dielectric constants.  Example :  NaCl is highly soluble in water. NaCl is sparingly soluble in benzene.  3. Temperature Affecting Solubility for most of the substances, solubility increases with the increase in temperature. however, the solubility of some substances decreases with increase in temperature. In case of Some substances, the temperature has no or little effect on the solubility .  Factors which affecting solubility de finition  Pressure affect solubility if it increases, solubility in

magnetic field due to current carrying conductor

In this post you were told about the magnetic field due to current carrying conductor . I hope you have understood this. Magnetic field due to current through a straight conductor Take a plane rectangular card board. Stick a white paper to it. Make a small hole at its center. Hold the cardboard in a horizontal position and pass a straight conductor 'AB' through the hole at its center such that the length of AB is perpendicular to the plane of the cardboard. Sprinkle some iron fillings on the cardboard. Connect the ends of the conductor (A and B) to a source of electricity like a cell through a plug key 'K as shown in the Fig. 1. As soon as the plug is inserted into the key 'K', the electric circuit is completed and an electric current is established in the conductor in the direction B to A, and immediately, the iron fillings orient themselves in concentric circles as shown in Fig. 1.  The direction of the magnetic field due to the current in the conductor is g

Image formed by the mirrors

In this post, you are given complete information about the image formed by the mirrors. Image formed by two mirrors   Consider two mirrors that are placed such that they make an angle ' Θ ' with each other and their reflecting surfaces face towards each other. If an object is placed between them as shown in the Fig. 1, formation of more than one image takes place. Images formed by two plane mirrors ' M M 1' and ' N N 1 ' are two plane mirrors placed such that the angle between them is ' Θ '. 'O' is a point object placed between them as shown in Fig. 1. Multiple images are formed in each of the mirrors, as the image of the object in the first mirror acts as an imaginary object for the second mirror and vice versa. The total number of images (n) formed is given by the expression,                n = [ 360 ÷ Θ − 1 ] If  Θ  = 90 °, the number of images formed is  n = 360 ÷ 90 − 1 = 3 If  Θ  = 0 °, ie, the mirrors are parallel to each other, infinite i

Element and compound Complete information about

In this post you will get complete information about element and compound. What is element and compound The 118 authorized elements can be broadly categorized as metals and non-metals. Metals gained significance not only due to their large number but also due to their widespread use in various fields of industry. Nevertheless, the role of non-metals is not insignificant in day-to-day life. The importance of oxygen and carbon in the biosphere is incredible. Apart from this, some non-metals in the form of their compounds occupy the most pivotal position in the industrial sector and they are rightly called industrial chemicals .  Nitrogen, the element which is well known for its abundance in the atmospheric air, is the most important nutrient for plants. Therefore, the various compounds of nitrogen are manufactured for the use as fertilizers. Sulphur and phosphorous also form a part of the fertilizer industry. In addition to this common use, certain compounds are useful for specific purpo

Industrial methods of preparation oxygen

Industrial methods of preparation oxygen In this post you are told about Industrial methods of preparation oxygen Industrial methods of preparation  air and water being the resources in which oxygen is abundantly available, oxygen is prepared at a large scale from these natural resources.  1 . Fractional distillation of liquid air: The various steps involved are given below:  (a) Removal of dust particles: Air should be first free from dust particles, this is done by passing air either through filters or through electric precipitators.  (b) Removal of water vapor: The air free of dust particles is passed through conc.  h 2 s o 4,  or anhydrous calcium chloride.   (c) Removal of  c o 2 : The dry air is passed through caustic soda or caustic potash.  (d) Liquefaction of air: A high presspre of 100 atm-200 atm range is applied to dry air. Then air is allowed to expand by pumping it through a fine jet. This sudden expansion results in cooling. The same process is repeated a number o

Multiple choice questions on heat and temperature with answers

Multiple choice questions on heat and temperature with answers On this post you will find Multiple choice questions on heat and temperature with answers 1. Which of the following represents the smallest temperature change?  (a) 1°C  (b) 1°F  (c) 1K  (d) Both (a) and (c) Answer- b 2. The degree of hotness or coldness of a body is called its  (a) heat capacity   (c) latent heat capacity  (d) None of these (b) temperature Answer- b 2. Given that the ratio of specific heat capacity of alcobol to that of water is 13:25, which of the following statements is true?  A: When temperature is raised through 1°C the heat energy absorbed by 2 kg of alcohol is less than the heat energy absorbed by 1 kg of water.  B: Heat capacity of 2 kg alcohol is more than the heat capacity of 1 kg water.  (a) A is true and B is false,  (b) A and B are true.  (c) A is false and B is true.  (d) A and B are false.  Answer- c 4 . -40°C is numerically equal to  (a) -40°F  (b) 233 K  (c) -32°R  (d) All the above  Answer