41. The reason of unusual physical properties of water is due to the presence of ?
(A) Covalent bond
(B) Coordinate cov. Bond
(C) Hydrogen bonding
(D) None of these
(A) Covalent bond
(B) Coordinate cov. Bond
(C) Hydrogen bonding
(D) None of these
42. The density of water is one gram per centimeter cube at ?
(A) 60 °C
(B) 4 °C
(C) 100 °C
(D) 0 °C
(A) 60 °C
(B) 4 °C
(C) 100 °C
(D) 0 °C
43. The enormous quantity of water present on earth surface acts as giant thermostat due to its high ?
(A) Density
(B) Boiling Point
(C) Latent heat values
(D) Heat Capacity
(A) Density
(B) Boiling Point
(C) Latent heat values
(D) Heat Capacity
44. The latent heat of fusion of water is ?
(A) 4.2 KJ/Mol
(B) 5.2 KJ/Mol
(C) 6 KJ/Mol
(D) 5.7 KJ/Mol
(A) 4.2 KJ/Mol
(B) 5.2 KJ/Mol
(C) 6 KJ/Mol
(D) 5.7 KJ/Mol
45. Dielectric constant of water at 18 °C is ?
(A) 70
(B) 80
(C) 84
(D) 75
(A) 70
(B) 80
(C) 84
(D) 75
46. Water gas is a mixture of ?
(A) Hydrogen & Oxygen
(B) Steam & Air
(C) CO & H2
(D) None of these
(A) Hydrogen & Oxygen
(B) Steam & Air
(C) CO & H2
(D) None of these
47. Chlorine act as a bleaching agent in the presence of ?
(A) HNO3
(B) NaOH
(C) HCL
(D) H2O
(A) HNO3
(B) NaOH
(C) HCL
(D) H2O
48. The chemical formula of magnetic oxide is ?
(A) Fe3O4
(B) Fe2O3.H2O
(C) Fe2O3
(D) FeO
(A) Fe3O4
(B) Fe2O3.H2O
(C) Fe2O3
(D) FeO
49. Rain water is acidic in nature because air contain ?
(A) Carbon dioxide
(B) Nitrogen
(C) Oxygen
(D) All of these
(A) Carbon dioxide
(B) Nitrogen
(C) Oxygen
(D) All of these
50. Nutrient pollution of water bodies is caused by ?
(A) Nitrates & Phosphates
(B) Pathogens
(C) Acid rain
(D) Cal & Mag
(A) Nitrates & Phosphates
(B) Pathogens
(C) Acid rain
(D) Cal & Mag