On heating Hydrated Copper Sulphate, it turns ______ colour.
Hydrated copper sulphate, on heating, changes from blue to white and the crystalline form changes to amorphous (powder). The chemical... View Article
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The homogenous mixture of solute and solvent is called _______
Solute and solvent uniformly mix to form a solution. Therefore, the homogenous mixture of solute and solvent is called a solution. What... View Article
Dry husky cough and infection in the lungs are the symptoms of _______
Dry husky cough and infection in the lungs are the symptoms of tuberculosis Tuberculosis (TB) It is a contagious infection... View Article
Explain the principle of an electric generator and the function of brushes
Solution: An electric generator works on the principle of electromagnetic induction phenomenon. According to it, whenever a coil is rotated... View Article
Oxygen _____ combustion and is ______ itself
Oxygen supports combustion and is non-combustible itself. Air or oxygen, which helps in burning, is called a supporter of combustion,... View Article
People having a deficiency of _______ suffer from muscle cramps.
When the potassium level is low in the blood, it causes muscle cramps, although it is more common for low... View Article
What is the range of frequencies associated with infrasound and ultrasound?
Solution: (a) Infrasound has frequencies less than 20 Hz. Examples: Bats, Dolphins, can emit ultrasound waves (b) Ultrasound has frequencies more... View Article
Write five pairs of prime numbers less than 20 whose sum is divisible by 5.
Solution: Prime numbers less than 20 are 2, 3, 5, 7, 11, 13, 17 and 19. (i) 2+3=5 (divisible by... View Article
Incomplete combustion of fuels releases toxic gas called ______
Carbon monoxide gas is formed when a fuel burns in a limited supply of air (oxygen). What is combustion and... View Article
The Presence of – Fill in the Blank – in Air Controls the Process of Burning
The presence of nitrogen gas in air controls the process of burning.
Calculate the number of aluminium ions present in 0.051 g of Aluminium oxide (Hint: The mass of an ion is the same as that of an atom of the same element. Atomic mass of Al = 27 u) .
Answer: Mole of aluminium oxide (Al2O3) is ⇒ 2 x 27 + 3 x 16 Mole of aluminium oxide =... View Article
Pyrimidine bases in RNA are the _______ and ________
Pyrimidine bases in RNA are cytosine and uracil. What are the nitrogenous bases? Deoxyribonucleic acid (DNA) and Ribonucleic acid (RNA)... View Article
The ________ readily adsorbs hydrogen at room temperature.
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 ________ of electricity because it does not form ions.
Pure water is a non-conductor of electricity because it does not form ions. A Substance can conduct electricity only if... View Article
A mixture of Sulphur powder and water can be separated by ______
A mixture of sulphur powder and water can be separated by filtration. What is the filtration? Filtration is a method... View Article
Chemicals and paint residues are examples of ______ wastes.
Chemicals and paint residues are examples of industrial wastes How to dispose of industrial waste? The major generators of industrial... View Article
The force of attraction between cation and anion is called _______
The force of attraction between cation and anion is called electrostatic force. Coulombs Law The fundamental law of electrostatics stating... View Article
A Compound is a ______ substance made up of ______
A compound is a pure substance made up of two or more elements. Properties of pure substances A substance with... View Article
________ are biocatalysts that speed up the reactions in biosystems.
The reaction in the body occurs with the help of biocatalyst called enzymes as they provide an alternative lower activation... View Article
Mixtures of several indicators are known as the ______ indicator
A Universal indicator is a mixture of many indicators (or dyes) which gives different colours at different concentrations of hydrogen... View Article
