The number of gram molecules of chlorine in 6.02  1025hydrogen chloride molecules is 50

305.    The number of gram molecules of chlorine in 6.02  10²⁵hydrogen chloride molecules is

(A) 5

(B) 50

(C) 100

(D) 10

Answer:: (B)

306.    The number of nodal planes present in   s antibonding orbitals is

(A) 1

(B) 2

(C) 0

(D) 3

Answer:: (A)

307.    The number of unidentate ligands in the complex ion is called

(A) EAN

(B) Coordination number

(C) primary valency

(D) oxidation number

Answer:: (B)

308.    The one which has least Iodine value is

(A) Ghee

(B) Groundnut oil

(C) Sunflower oil

(D) Ginger oil

Answer:: (A)

309.    The order of stability of metal oxides is

(A)       Fe₂O₃ < Cr₂O₃ < AIZO3 < MgO

(B)       Fe₂O₃ < Al₂O₃ < Cr₂O₃ < MgO

(C)       Al₂O₃ < MgO < Fe₂O₃< Cr₂O₃

(D)       Cr₂O₃ < MgO < Al₂O₃ < Fe₂O₃

Answer:: (A)

310.    Which one of the following statement is no true?

(A)        Oxides of sulphur, nitrogen and carbon are the most widespread air pollutant

(B)       pH of drinking water should be between 5.5 – 9.5

(C)       Concentration of DO below 6 ppm is good for the growth of fish

(D)       Clean water would have a BOD value of less than 5 ppm

Answer:: (C)