Which one of the following is paramagnetic?

91.       Which one of the following is paramagnetic?

(A) N2

(B) NO

(C) CO

(D) O3

Answer:: (B)

92.       Which one of the following is a covalent crystal?

(A) Ice

(B) Rock salt

(C) Dry ice

(D) Quartz

Answer:: (D)

93.       Which one of the following DOES NOT involve coagulation?

(A) Formation of delta region

(B) Clotting of blood by the use of ferric chloride

(C) Peptization

(D) Treatment of drinking water by potash alum

Answer:: (C)

94.       Which one is not a constituent of nucleic acid?

(A) Uracil

(B) Guanidine

(C) Phosphoric acid

(D) Ribose sugar

Answer:: (B)

95.       50 cm3 of 0.2 N HCI is titrated against 0.1 N NaOH solution. The titration is discontinued after adding 50 cm3 of NaOH. The remaining titration is completed by adding 0.5 N KOH. The volume of KOH required for completing the titration is ______.

(A) 10 cm3

(B) 12 cm3

(C) 10.5 cm3

(D) 25 cm3

Answer:: (A)

96.       80 g of oxygen contains as many atoms as in

(A) 80 g of hydrogen

(B) 1 g of hydrogen

(C) 10 g of hydrogen

(D) 5 g of hydrogen

Answer:: (D)

97.       9.65 C of electric current is passed through fused anhydrous magnesium chloride. The magnesium metal thus obtained is completely converted into a Grignard reagent. The number of moles of the Grignard reagent obtained is ______.

(A) 1 ´ 10-4

(B) 5 ´ 10-4

(C) 1 ´ 10-5

(D) 5 ´ 10-5

Answer:: (D)

98.       A 6% solution of urea is isotonic with

(A) 6% solution of Glucose

(B) 25% solution of Glucose

(C) 1 M solution of Glucose

(D) 0.05 M solution of Glucose

Answer:: (C)

99.       A bivalent metal has an equivalent mass of 32. The molecular mass of the metal nitrate is

(A) I92

(B) 188

(C) 182

(D) 168

Answer:: (B)