0.023 g of sodium metal is reacted with 100 cm3 of water. The pH of the resulting solution is 12

80        .+I effect is shown by

(A)       -N02

(B)       -Cl

(C)       -Br

(D)       -CH3

Answer:: (D)

81.       0.023 g of sodium metal is reacted with 100 cm3 of water. The pH of the resulting solution is

(A) 11

(B) 10

(C) 12

(D) 9

Answer:: (C)

82.       0.5 mole of each of H2, SO2 and CH4 are kept in a container. A hole was made in the container. After 3 hours, the order of partial pressures in the container will be

(A) pH2 > pSO2 > pCH4

(B) pH2 > pCH4 > pSO2

(C) pSO2 > pH2 > pCH4

(D) pSO2 > pCH4, > pH2

Answer:: (D)

83.       10 cm3 of 0.1 N monobasic acid requires 15 cm3 of sodium hydroxide solution whose normality is

(A) 1.5 N

(B) 0.15 N

(C) 0.066 N

(D) 0.66 N

Answer:: (C)

84.       10-6 M NaOH is diluted 100 times. The pH of the diluted base is

(A) between 6 and 7

(B) between 10 and 11

(C) between 7 and 8

(D) between 5 and 6

Answer:: (C)

85.       2 gm of a radioactive sample having half life of 15 days was synthesised on 1st Jan 2009. The amount of the sample left behind on 1st March. 2009 (including both the days)

(A) 1 gm

(B) 0.5 gm

(C) 0 gm

(D) 0.125 gm

Answer:: (D)

86.       each of H2 and I2 are added to the system, the equilibrium constant will be

(A) 3.2

(B) 1.6

(C) 6.4

(D) 0.8

Answer:: (C)