Gas Test 1.Hydrogen (H2) Burns with pale blue flame producing a 'pop' sound Extinguishes burning splinter. Neutral to Litmus Colourless, Odourless 2.Oxygen (O2) Colourless alkaline pyrogallol solution turns brown. R . . .
Tests to detect cations present in a metallic salts with sodium & ammonium hydroxide . . .
How does soaps clean dirt from cloth Soaps are molecules in which the two ends have differing properties, one is hydrophilic, that is, it dissolves in water, while the other end is hydrophobic, that is, it dissolves in hydrocarbons. When soap is at the surface of water, the hydrophobic ‘tail’ of soap will not be soluble in water and the s . . .
Alkanes - saturated hydrocarbons The names of the straight chain saturated hydrocarbons for up to a 12 carbon chain are shown below. The names of the substituents formed by the removal of one hydrogen from the end of the chain is obtained by changing the suffix -ane to -yl. Number of Carbons . . .
1.Cretinism: it is caused due to undersecretion during growth years. It two main effects are: Dwarfism: due to failure of the skeleton to grow and mature. Mental retardation: due to failure of the brain to develop fully Cretins also show retarded sexual development, yellowish skin colour, round face, large thick producing to . . .
Ans. The causes for overpopulation are as follows: 1) High Birth Rate: Children are born at a very high rate in India due to early marriage, social and religious beliefs, lack of education, ignorance, illiteracy and poor economic conditions. 2) Fall in Death Rate: Improvement in medical facilities, better sanitation, development of education, cont . . .