Hydrated copper sulphate, on heating, changes from blue to white and the crystalline form changes to amorphous (powder). The chemical reaction is... View Article
Solute and solvent uniformly mix to form a solution. Therefore, the homogenous mixture of solute and solvent is called a solution. The... View Article
Dry husky cough and infection in the lungs are the symptoms of tuberculosis It is a contagious infection caused by a type of bacteria called... View Article
Solution: An electric generator works on the principle of electromagnetic induction phenomenon. According to it, whenever a coil is rotated... View Article
Oxygen supports combustion and is non-combustible itself. Air or oxygen, which helps in burning, is called a supporter of combustion, and the... View Article
When the potassium level is low in the blood, it causes muscle cramps, although it is more common for low potassium to be associated with muscle... View Article
Solution: (a) Infrasound has frequencies less than 20 Hz. Examples: Bats, Dolphins, can emit ultrasound waves (b) Ultrasound has frequencies... View Article
Solution: Prime numbers less than 20 are 2, 3, 5, 7, 11, 13, 17 and 19. (i) 2+3=5 (divisible by 5) (ii) 2+13= 15 (divisible by 5) (iii)... View Article
Carbon monoxide gas is formed when a fuel burns in a limited supply of air (oxygen). Complete combustion reacts with oxygen with a fuel to... View Article
Answer: Mole of aluminium oxide (Al2O3) is ⇒ 2 x 27 + 3 x 16 Mole of aluminium oxide = 102 g i.e., 102 g of Al2O3= 6.022 x 1023 molecules of... View Article
Pyrimidine bases in RNA are cytosine and uracil. Deoxyribonucleic acid (DNA) and Ribonucleic acid (RNA) are perhaps the most important cell... View Article
Palladium, platinum or nickel readily adsorbs hydrogen at room temperature. The adsorption of hydrogen on transition metals like platinum and... View Article
Pure water is a non-conductor of electricity because it does not form ions. A Substance can conduct electricity only if it contains charged... View Article
A mixture of sulphur powder and water can be separated by filtration. Filtration is a method for separating an insoluble solid from a liquid.... View Article
Chemicals and paint residues are examples of industrial wastes The major generators of industrial solid wastes are the thermal power plants... View Article
The force of attraction between cation and anion is called electrostatic force. The fundamental law of electrostatics stating that the force... View Article
A compound is a pure substance made up of two or more elements. A substance with a fixed chemical composition is called a pure substance,... View Article
The reaction in the body occurs with the help of biocatalyst called enzymes as they provide an alternative lower activation energy path and so... View Article
A Universal indicator is a mixture of many indicators (or dyes) which gives different colours at different concentrations of hydrogen ions in the... View Article