Question

Fill in the blanks 

(a) Water is a .....................  solvent. 

(b) ..................... is the purest form of natural water. 

(c) Sand and dust are suspended impurities in ................ 

(d) Sea water has high concentration of  ................................

(e) Water covers nearly .................................  th of the surface of the earth. 

(f) Evaporation of rain water leaves .................. residue. 

(g) ................  is the chemical added to water to remove the tiny suspended particles. 

(h) A .................  is a uniform mixture of a solute and a solvent. 

(i) Ice, water and steam have different physical states but are chemically ...................... 

(j) Boiling kills most of the ................ in water. 

(k) The elements present in the molecules of water are .........................  and ...................

Answer 1

(a) Water is a universal; solvent. 

(b) Rainwater is the purest form of natural water. 

(c) Sand and dust are suspended impurities in water. 

(d) Sea water has high concentration of salt (impurity). 

(e) Water covers nearly 4 / 5 th of the surface of the earth. 

(f) Evaporation of rain water leaves NO residue. 

(g) Potash alum is the chemical added to water to remove the tiny suspended particles. 

(h) A solution is a uniform mixture of a solute and a solvent. 

(i) Ice, water and steam have different physical states but are chemically identical. 

(j) Boiling kills most of the germs in water. 

(k) The elements present in the molecules of water are hydrogen and oxygen.